CA2239482C - Polyurethane elastomers - Google Patents
Polyurethane elastomers Download PDFInfo
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- CA2239482C CA2239482C CA002239482A CA2239482A CA2239482C CA 2239482 C CA2239482 C CA 2239482C CA 002239482 A CA002239482 A CA 002239482A CA 2239482 A CA2239482 A CA 2239482A CA 2239482 C CA2239482 C CA 2239482C
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/302—Water
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4804—Two or more polyethers of different physical or chemical nature
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- C—CHEMISTRY; METALLURGY
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
- C08G18/4837—Polyethers containing oxyethylene units and other oxyalkylene units
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/6552—Compounds of group C08G18/63
- C08G18/6558—Compounds of group C08G18/63 with compounds of group C08G18/32 or polyamines of C08G18/38
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
- C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
- C08G18/6677—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203 having at least three hydroxy groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
- C08G18/78—Nitrogen
- C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
- C08G18/797—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing carbodiimide and/or uretone-imine groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G2410/00—Soles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S521/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S521/914—Polyurethane cellular product formed from a polyol which has been derived from at least two 1,2 epoxides as reactants
Abstract
A polyisocyanate-based elastomer having a ratio of the storage modulus (E') at 20 .degree.C and the storage modulus (E') at 120 .degree.C of between 0.75 and 1.5, a tan .delta. at 100 .degree.C of less than 0.1 and a maximum value of the tan .delta. of more than 0.8, the tan .delta. being the ratio of the loss modulus (E") and the storage modulus (E').
Description
POLYLTRE'E'RnM+' ELASTONERS
DESCRIPTION
The present invention relates to novel polyurethane elastomers and a method for the preparation thereof.
Polyurethane elastomers are made by reacting diisocyanates, such as toluene diisocyanate (TDI), 1,5 naphthalene diisocyanate (NDI) or 4,4' diphenylmethane diisocyanate (4,4' I4flI), with high molecular weight polyols, such as polyester polyols or polyether polyols, and low molecular weight polyols or polyataines, such as ethylene glycol or butane diol.
High molecular weight polyether polyols mainly used are polytetrahydrofuran or polypropyleneoxi.de.
The preparation of elastomeric polyurethanes from polyether polyols containing minor amounts of ethylene oxide (EO)-groups is also known, see for example EP-A-13487.
Formulations coaprising high amrounts of 4,4'-24DI and polyether polyols having high Eo-contents have already been used to prepare flexible polyurethane foams, see for example EP-A-547764, EP-A-547765 and EP-A-549120.
None of the known isocyanate-based elastomers however shows satisfactory dynamic modulus behaviour over a broad temperature range.
A new class of polyurethane elastomers has now been found which show a quasi-perfect elastomeric behaviour over a broad temperature range.
Thus, the present invention relates to polyi.socyanate-based elastomers having a ratio of the storage modulus (E') at 20 C and the storaage modulus (E') at 120 C of between 0.75 and 1.5, a tan 6 at 100 C of less than 0.1 and a mnximum value of the tan 5 of more than 0.8, the tan b being the ratio of the loss modulus (E ") and the storage modulus (E').
Preferably, the maximum value of the tan b is more than ]1Ø
The ratio of the storage modulus (E') at 20 C and the storage modulus (E') at 120 C is preferably between 0.8 and 1.2, and most preferably between 0.'85 and 1.1.
It is preferred to have a tan 6 at 100 C of less than 0.05. Most preferably the tan 6 at 100 C is less than 0.03.
The prime +~+aYin++**~+ of the tan 6 preferably occurs at a temperature below 0 C, most preferably below -10 C.
The storage and loss modulus are measured by Dynamic Mechanical Thermal Analysis (DMTA measured according to ISO/DIS 6721-5).
These novel polyurethane elastomers can be made from formulations containing polyols having high oxyethylene contents or polyol blends containing polyester polyols and high concentrations of polyols having high oxyethylene contents, substantially pure 4,4'-N.IDI or a derivative thereof, and a low molecular weight chain extender and optionally a crosslinking agent.
Thus, according to the invention, there is also provided a method for the preparation of polyurethane elastomers from a reaction mixture comprising a polyisocyanate component, a polyol composition, a ehain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight of up to 250.
The polyisocyanate component used in the invention may be any aromatic or aliphatic polyisocyanate such as TDi, 13Di or pure 4,4'-diphenylmethane diisocyanate or mixtures of that diisocyanate with one or more other organic polyisocyanates, especially other diphenylmethane diisocyanate isomers, for example the 2,4'-isomer optionally in conjunction with the 2,2'-isomer. The polyisocyanate component may also be an UDI variant derived from a polyisocyanate composition containing at least 85% by weight of 4,41-dipheny1a-ethane diisocyanate. MDI variants are well known in the art and, for use in accordance with the invention, particularly include liquid products obtained by introducing uretonimine and/or carbodiimide groups into said polyisocyanate composition and/or by reacting with one or more polyols.
DESCRIPTION
The present invention relates to novel polyurethane elastomers and a method for the preparation thereof.
Polyurethane elastomers are made by reacting diisocyanates, such as toluene diisocyanate (TDI), 1,5 naphthalene diisocyanate (NDI) or 4,4' diphenylmethane diisocyanate (4,4' I4flI), with high molecular weight polyols, such as polyester polyols or polyether polyols, and low molecular weight polyols or polyataines, such as ethylene glycol or butane diol.
High molecular weight polyether polyols mainly used are polytetrahydrofuran or polypropyleneoxi.de.
The preparation of elastomeric polyurethanes from polyether polyols containing minor amounts of ethylene oxide (EO)-groups is also known, see for example EP-A-13487.
Formulations coaprising high amrounts of 4,4'-24DI and polyether polyols having high Eo-contents have already been used to prepare flexible polyurethane foams, see for example EP-A-547764, EP-A-547765 and EP-A-549120.
None of the known isocyanate-based elastomers however shows satisfactory dynamic modulus behaviour over a broad temperature range.
A new class of polyurethane elastomers has now been found which show a quasi-perfect elastomeric behaviour over a broad temperature range.
Thus, the present invention relates to polyi.socyanate-based elastomers having a ratio of the storage modulus (E') at 20 C and the storaage modulus (E') at 120 C of between 0.75 and 1.5, a tan 6 at 100 C of less than 0.1 and a mnximum value of the tan 5 of more than 0.8, the tan b being the ratio of the loss modulus (E ") and the storage modulus (E').
Preferably, the maximum value of the tan b is more than ]1Ø
The ratio of the storage modulus (E') at 20 C and the storage modulus (E') at 120 C is preferably between 0.8 and 1.2, and most preferably between 0.'85 and 1.1.
It is preferred to have a tan 6 at 100 C of less than 0.05. Most preferably the tan 6 at 100 C is less than 0.03.
The prime +~+aYin++**~+ of the tan 6 preferably occurs at a temperature below 0 C, most preferably below -10 C.
The storage and loss modulus are measured by Dynamic Mechanical Thermal Analysis (DMTA measured according to ISO/DIS 6721-5).
These novel polyurethane elastomers can be made from formulations containing polyols having high oxyethylene contents or polyol blends containing polyester polyols and high concentrations of polyols having high oxyethylene contents, substantially pure 4,4'-N.IDI or a derivative thereof, and a low molecular weight chain extender and optionally a crosslinking agent.
Thus, according to the invention, there is also provided a method for the preparation of polyurethane elastomers from a reaction mixture comprising a polyisocyanate component, a polyol composition, a ehain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight of up to 250.
The polyisocyanate component used in the invention may be any aromatic or aliphatic polyisocyanate such as TDi, 13Di or pure 4,4'-diphenylmethane diisocyanate or mixtures of that diisocyanate with one or more other organic polyisocyanates, especially other diphenylmethane diisocyanate isomers, for example the 2,4'-isomer optionally in conjunction with the 2,2'-isomer. The polyisocyanate component may also be an UDI variant derived from a polyisocyanate composition containing at least 85% by weight of 4,41-dipheny1a-ethane diisocyanate. MDI variants are well known in the art and, for use in accordance with the invention, particularly include liquid products obtained by introducing uretonimine and/or carbodiimide groups into said polyisocyanate composition and/or by reacting with one or more polyols.
Preferred as the polyisocyanate component are polyisocyanate compositions containing at least 90% by weight of 4,41 -diphenylmethane diisocyanate.
Polyisocyanate compositions containing at least 95% by weight of 4,4'-diphenylmethane diisocyanate are most preferred.
The polyol composition may consist of one or more polyether polyols optionally blended with other polyols, such as polyester polyols.
The composition may comprise a single polyoxyalkylene polyol which preferably is a poly(oxyethylene-oxypropylene) polyol having the required functionality, equivalent weight and oxyethylene content. Such polyols are known in the art and may be obtained in conventional manner by reacting ethylene and propylene oxides simultaneously and/or sequentially in any order with an initiator such as water, a polyol, a hydroxylamine, a polyamine and the like having from 2 to 4 active hydrogen atoms.
Alternatively, the polyol composition may comprise a mixture of two or more polyoxyalkylene polyols such that the total composition has the required average functionality, equivalent weight and oxyethylene content. The polyoxyalkylene polyols present in such mixturea3 are preferably poly(oxyethylene-oxypropylene) polyols but one or more polyoxyethylene polyols and/or polyoxypropylene polyols may also be present.
Preferred polyether polyol compositions comprise:
(a) from 75 to 100% by weight of a first polyol component comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol component having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 1000 to 5000 and an average oxyethylene content of from 60 to 85% by o-eight, and (b) from 25 to 0t by weight of another polyol component.
Polyol component (b) suitably has an average functionality of from 2 to 4, an average equivalent weight of 1000 to 3000 and may be, for example, a polyoxypropylene polyol, a polyoxyethylene polyol or a poly(oxyethylene-oxypropylene) polyol containing less than 60% or more than 85% by weight of oxyethylene residues.
= The term "average nominal hydroxyl functionality" is used herein to indicate the average functionality (number of hydroxyl groups pier molecule) of the polyol composition on the assumption that the average functionality of the polyoxyalkylene polyols present therein is identical with the average functionality (number of active hydrogen atoms per molecule) of the initiator(s) used in their preparation although in practice i.t will often be somewhat less because of some terminal unsaturati.on_ It is preferred that the average naaninal hydroxyl functionality of the polyol composition is from 2 to 3.
If desired, the polyoxyalkylene polyol (or one or more of the polyoxyalkylene polyols when a mixture is used) may contain dispersed polymer particles. Such polymer modified polyols have been fully described in the prior art and include products obtained by the in situ polymerisation of one or more vinyl monomers, for example acrylonitrile and styrene, in polyoxyalkylene polyols or by the in situ reaction between a polyisocyanate and an amino-or hydroxy-functional compound, for example triethanolamine, in the polyoxyalkylene_ A].so suitable as polyol (b) are polyester polyols.
Polyester polyols which may be used include hydroxyl-terminated reaction products of polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,4-butanediol, bis(hydroxyethyl) terephthalate, glycerol, trimethylolpropane, hexanediol, neopentyl glycol, methylpentane dio1, pentaerythri.tol or polyether polyols or mixtures of such polyhydric alcohols, and polycarboxylic acids, especially dicarboxylic acids or their ester-fo=m+ng derivatives, for example succinic, glutaric and adipic acids or their dimethyl esters, sebacic acid, phthalic anhydride, tetrachlorophtha7.ic anhydride or dimethyl terephthalate or mixtures thereof.
Preferred polyesters have a number average molecular weight of 750-4000, especially 750-2500, and an average nominal functionality of 2-3.
Suitable chain extenders include low molecular weight diols, aminoalcohols or diamines such as ethylene glycol, diethylene glycol, dipropylene glycol, tripropylene glycol, propanediol, butanediol, pentanediol, hexanediol, 3-methylpentane-l,5-diol, ethanolamine or diethyltoluened3.amine.
Low molecular weight isocyanate-reactive compounds having an average functionality of 3 or more, such as glycerol, pentaerythritol or triethanolamine, may be added as crosslinking agents.
It is preferred to add small amounts of water, most preferably less than 2%
Polyisocyanate compositions containing at least 95% by weight of 4,4'-diphenylmethane diisocyanate are most preferred.
The polyol composition may consist of one or more polyether polyols optionally blended with other polyols, such as polyester polyols.
The composition may comprise a single polyoxyalkylene polyol which preferably is a poly(oxyethylene-oxypropylene) polyol having the required functionality, equivalent weight and oxyethylene content. Such polyols are known in the art and may be obtained in conventional manner by reacting ethylene and propylene oxides simultaneously and/or sequentially in any order with an initiator such as water, a polyol, a hydroxylamine, a polyamine and the like having from 2 to 4 active hydrogen atoms.
Alternatively, the polyol composition may comprise a mixture of two or more polyoxyalkylene polyols such that the total composition has the required average functionality, equivalent weight and oxyethylene content. The polyoxyalkylene polyols present in such mixturea3 are preferably poly(oxyethylene-oxypropylene) polyols but one or more polyoxyethylene polyols and/or polyoxypropylene polyols may also be present.
Preferred polyether polyol compositions comprise:
(a) from 75 to 100% by weight of a first polyol component comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol component having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 1000 to 5000 and an average oxyethylene content of from 60 to 85% by o-eight, and (b) from 25 to 0t by weight of another polyol component.
Polyol component (b) suitably has an average functionality of from 2 to 4, an average equivalent weight of 1000 to 3000 and may be, for example, a polyoxypropylene polyol, a polyoxyethylene polyol or a poly(oxyethylene-oxypropylene) polyol containing less than 60% or more than 85% by weight of oxyethylene residues.
= The term "average nominal hydroxyl functionality" is used herein to indicate the average functionality (number of hydroxyl groups pier molecule) of the polyol composition on the assumption that the average functionality of the polyoxyalkylene polyols present therein is identical with the average functionality (number of active hydrogen atoms per molecule) of the initiator(s) used in their preparation although in practice i.t will often be somewhat less because of some terminal unsaturati.on_ It is preferred that the average naaninal hydroxyl functionality of the polyol composition is from 2 to 3.
If desired, the polyoxyalkylene polyol (or one or more of the polyoxyalkylene polyols when a mixture is used) may contain dispersed polymer particles. Such polymer modified polyols have been fully described in the prior art and include products obtained by the in situ polymerisation of one or more vinyl monomers, for example acrylonitrile and styrene, in polyoxyalkylene polyols or by the in situ reaction between a polyisocyanate and an amino-or hydroxy-functional compound, for example triethanolamine, in the polyoxyalkylene_ A].so suitable as polyol (b) are polyester polyols.
Polyester polyols which may be used include hydroxyl-terminated reaction products of polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, 1,4-butanediol, bis(hydroxyethyl) terephthalate, glycerol, trimethylolpropane, hexanediol, neopentyl glycol, methylpentane dio1, pentaerythri.tol or polyether polyols or mixtures of such polyhydric alcohols, and polycarboxylic acids, especially dicarboxylic acids or their ester-fo=m+ng derivatives, for example succinic, glutaric and adipic acids or their dimethyl esters, sebacic acid, phthalic anhydride, tetrachlorophtha7.ic anhydride or dimethyl terephthalate or mixtures thereof.
Preferred polyesters have a number average molecular weight of 750-4000, especially 750-2500, and an average nominal functionality of 2-3.
Suitable chain extenders include low molecular weight diols, aminoalcohols or diamines such as ethylene glycol, diethylene glycol, dipropylene glycol, tripropylene glycol, propanediol, butanediol, pentanediol, hexanediol, 3-methylpentane-l,5-diol, ethanolamine or diethyltoluened3.amine.
Low molecular weight isocyanate-reactive compounds having an average functionality of 3 or more, such as glycerol, pentaerythritol or triethanolamine, may be added as crosslinking agents.
It is preferred to add small amounts of water, most preferably less than 2%
by weight based on the total weight of the isocyanate-reactive, to the fozmulation. The isocyanate-index of the reaction system, taking account of the polyol ccuposition, water and any other isocyanate-reactive species, for exang~le chain extenders and opt. crosslinking agents, may be as low as 85 or as high as 120. Preferably, the isocyanate index is between 90 and 110. The most preferred isocyanate-index is between 95 and 105.
The elastomer-forming reaction mixture may contain one or more of the additives conventional to such reaction mixtures. Such additives include catalysts, for example tertiary amines and tin compounds, surface-active agents and foam stabilisers, for example siloxane-osyalkylene copolymers, flame retardants, organic and inorganic fillers, pigments, and internal mould release agents.
The invention furthermore provides a reaction system comprising:
(a) a polyisocyanate component containing at least 85$ by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof;
(b) a polyol composition comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85$ by weight;
(c) a chain extender having an average hydroxyl equivalent weight of up to 250, and optionally, (d) water, (e) a crosslinking agent, and (f) one or more additives conventional to elastomer formulations.
This reaction system is used for making polyurethane elastomers.
-5a-According to another aspect of the present invention, there is provided a polyisocyanate-based elastomer having a ratio of the storage modulus (E') at 20 C and the storage modulus (E') at 120 C of between 0.75 and 1.5, a tan b at 100 C
of less than 0.1 and a maximum value of the tan b of more than 1.0, the tan 5 being the ratio of the loss modulus (E ") and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5.
According to still another aspect of the present invention, there is provided a polyisocyanate-based elastomer having a ratio of the storage modulus (E') at 20 C and the storage modulus (E') at 120 C of between 0.75 and 1.5, a tan b at 100 C of less than 0.1 and a maximum value of the tan b of more than 0.8, the tan b being the ratio of the loss modulus (E'') and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5, wherein the elastomer is made from a reaction mixture comprising a polyisocyanate component, a polyol composition, a chain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyoi composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight of up to 250.
-5b-According to still another aspect of the present invention, there is provided a method for the preparation of polyisocyanate-based elastomers having a ratio of the storage modulus (E') at 20 C and the storage modulus (E') at 120 C of between 0.75 and 1.5, a tan b at 100 C of less than 0.1 and a maximum value of the tan of more than 0.08, the tan b being the ratio of the loss modulus (E ") and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5 wherein the elastomer is made from a reaction mixture comprising a polyisocyanate component, a polyol composition, a chain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight up to 250.
In operating the method of the invention, the known one-shot, semi-prepolymer or full prepolymer techniques may be applied together with mixing equipment conventionally used in the preparation of elastomers.
The elastomers according to the invention are particularly suitable for use in applications where good energy-absorbing and fatigue properties are required and a good elastomeric behaviour over a broad temperature range, e.g. in the automotive and footwear industry.
The elastomer-forming reaction mixture may contain one or more of the additives conventional to such reaction mixtures. Such additives include catalysts, for example tertiary amines and tin compounds, surface-active agents and foam stabilisers, for example siloxane-osyalkylene copolymers, flame retardants, organic and inorganic fillers, pigments, and internal mould release agents.
The invention furthermore provides a reaction system comprising:
(a) a polyisocyanate component containing at least 85$ by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof;
(b) a polyol composition comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85$ by weight;
(c) a chain extender having an average hydroxyl equivalent weight of up to 250, and optionally, (d) water, (e) a crosslinking agent, and (f) one or more additives conventional to elastomer formulations.
This reaction system is used for making polyurethane elastomers.
-5a-According to another aspect of the present invention, there is provided a polyisocyanate-based elastomer having a ratio of the storage modulus (E') at 20 C and the storage modulus (E') at 120 C of between 0.75 and 1.5, a tan b at 100 C
of less than 0.1 and a maximum value of the tan b of more than 1.0, the tan 5 being the ratio of the loss modulus (E ") and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5.
According to still another aspect of the present invention, there is provided a polyisocyanate-based elastomer having a ratio of the storage modulus (E') at 20 C and the storage modulus (E') at 120 C of between 0.75 and 1.5, a tan b at 100 C of less than 0.1 and a maximum value of the tan b of more than 0.8, the tan b being the ratio of the loss modulus (E'') and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5, wherein the elastomer is made from a reaction mixture comprising a polyisocyanate component, a polyol composition, a chain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyoi composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight of up to 250.
-5b-According to still another aspect of the present invention, there is provided a method for the preparation of polyisocyanate-based elastomers having a ratio of the storage modulus (E') at 20 C and the storage modulus (E') at 120 C of between 0.75 and 1.5, a tan b at 100 C of less than 0.1 and a maximum value of the tan of more than 0.08, the tan b being the ratio of the loss modulus (E ") and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5 wherein the elastomer is made from a reaction mixture comprising a polyisocyanate component, a polyol composition, a chain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight up to 250.
In operating the method of the invention, the known one-shot, semi-prepolymer or full prepolymer techniques may be applied together with mixing equipment conventionally used in the preparation of elastomers.
The elastomers according to the invention are particularly suitable for use in applications where good energy-absorbing and fatigue properties are required and a good elastomeric behaviour over a broad temperature range, e.g. in the automotive and footwear industry.
The invention is illustrated by the following examples in which all parts, percentages and ratios are by weight.
The following glossary of materials is included to identify reaction components not otherwise identified in the examples.
The following glossary of materials is included to identify reaction components not otherwise identified in the examples.
GLOSSARY
Polyisocyanate I: pure 4,41 -NDI (Suprasec MPR; conaaercia.lly available from Imperi.al Chemical Industries PLC; Suprasec is a trademark of ICI PLC).
Polyisocyanate II: uretonimine-awdified Mni (Suprasec 2020; commercially available from Imperial Chemical Industries PLC).
Polyisocyanate III: NIDI-based prepolymer (Suprasec 2433; commerca.ally available from Imperial Chemical Industries PLC) Polyisocyanate IV: isocyanate prepolymer made by reacting polyisocyanate I
and polyol B (NCO-content = 8.66*).
Polyol A: EO/PO triol having 70% random EO-groups; OH-value of 42 mg YCOH/g and about 45% primary OH-groups.
Polyol B: EO/PO diol having 7596 random EO-groups and OH-value of 27 mg KOH/g.
Polyol C: 70/30 blend of an EO/PO diol (2296 EO-t:ip; OH-value = 35mg KOH/g) and an EO/PO triol (1596 EO-tip; OH-value ~ 32 mg ROH/g) .
Polyol D: polymer-modified polyol (glycerol-init.iated polyol having OH-value a 34 mg ROH/g; 15% EO-tip; 7596 primary OH-groups and containing 20* styrene-acrylonitrile copolymer particles).
Polyol E: EO/PO diol having 2796 EO-tip and OH-value of 30 mg KOH/g.
Catalyst 1: Dabco EG; commerc5.ally available from Air Products.
Catalyst 2: Niax Al; coxeercially available from Union Carbide.
EG: ethylene glycol WO 97/21750 PC'fl/EP96/05035 E7CAtEPLEB
Examples 1,2,3 and 4 and comparative examples 1 and 2 r Elastomers were bench mixed and moulded in a 15 x 10 x 1 cm mould in a conventional manner using the foranxlations given in Table I and the properties ~
indicated in Table I were measured.
Table I
.. q:.. . ._i . f_ . ~ . ~ V
2,. 3 4 Csatnp 1 Co 2,,.
POZyiaoc}tmxaata; 1 36.4 42.7 - - - -Polyiaocyanutes x~ - - 46.8 - - 42.9 PC~~yaaoeyalicaatey~~C2 - - - - 109 PoI .:.i$o &natO IV - - - 100 - -polyal A.: 100.0 50.0 - - - -1'o1yol B 50.0 100.0 - - -Eol~*ol C - - - - 100.0 -L-o~~ol D - - - - 28.3 -Lsiil~ ol 3.* " - - - - - 100.0 34thylene glyccsl 5.0 7.0 7.0 4.55 8.9 6.0 0.3 0.3 0.3 0.21 0.6 0.3 r, = ' Catiatlya# ~ 1.0 0.5 1.0 0.7 2.6 1.0 Catmi st.~ - - - - 0.4 -~
Mouldad t3ansity (kg/mg) 450 440 440 580 490 585 Eardnesaf 46 51 41 62 47 N.M.*
(Asker C) (Asker C) (Asker C) (Asker C) (Shore A) (20 C)/E'(120 C) ratio 0.95 1.01 0.98 0.86 1.69 2.19 ta= ~(1C70 C) 0.002 0.013 0.024 0.005 0.070 0.078 tas5 ~ -23 -26 -11 -11 -43 -45 (tempeia+~urq ].h C) , ~ =
tan ~,.(~~u~~ 1.08 0.86 1.01 1.22 0.42 0.37 not measured The EI(20 C)/E(120 C) ratio of the elastomers according to the comparative examples is higher than 1.5 and their maxi *ry+lm value of the tan b is less than 0.8.
Polyisocyanate I: pure 4,41 -NDI (Suprasec MPR; conaaercia.lly available from Imperi.al Chemical Industries PLC; Suprasec is a trademark of ICI PLC).
Polyisocyanate II: uretonimine-awdified Mni (Suprasec 2020; commercially available from Imperial Chemical Industries PLC).
Polyisocyanate III: NIDI-based prepolymer (Suprasec 2433; commerca.ally available from Imperial Chemical Industries PLC) Polyisocyanate IV: isocyanate prepolymer made by reacting polyisocyanate I
and polyol B (NCO-content = 8.66*).
Polyol A: EO/PO triol having 70% random EO-groups; OH-value of 42 mg YCOH/g and about 45% primary OH-groups.
Polyol B: EO/PO diol having 7596 random EO-groups and OH-value of 27 mg KOH/g.
Polyol C: 70/30 blend of an EO/PO diol (2296 EO-t:ip; OH-value = 35mg KOH/g) and an EO/PO triol (1596 EO-tip; OH-value ~ 32 mg ROH/g) .
Polyol D: polymer-modified polyol (glycerol-init.iated polyol having OH-value a 34 mg ROH/g; 15% EO-tip; 7596 primary OH-groups and containing 20* styrene-acrylonitrile copolymer particles).
Polyol E: EO/PO diol having 2796 EO-tip and OH-value of 30 mg KOH/g.
Catalyst 1: Dabco EG; commerc5.ally available from Air Products.
Catalyst 2: Niax Al; coxeercially available from Union Carbide.
EG: ethylene glycol WO 97/21750 PC'fl/EP96/05035 E7CAtEPLEB
Examples 1,2,3 and 4 and comparative examples 1 and 2 r Elastomers were bench mixed and moulded in a 15 x 10 x 1 cm mould in a conventional manner using the foranxlations given in Table I and the properties ~
indicated in Table I were measured.
Table I
.. q:.. . ._i . f_ . ~ . ~ V
2,. 3 4 Csatnp 1 Co 2,,.
POZyiaoc}tmxaata; 1 36.4 42.7 - - - -Polyiaocyanutes x~ - - 46.8 - - 42.9 PC~~yaaoeyalicaatey~~C2 - - - - 109 PoI .:.i$o &natO IV - - - 100 - -polyal A.: 100.0 50.0 - - - -1'o1yol B 50.0 100.0 - - -Eol~*ol C - - - - 100.0 -L-o~~ol D - - - - 28.3 -Lsiil~ ol 3.* " - - - - - 100.0 34thylene glyccsl 5.0 7.0 7.0 4.55 8.9 6.0 0.3 0.3 0.3 0.21 0.6 0.3 r, = ' Catiatlya# ~ 1.0 0.5 1.0 0.7 2.6 1.0 Catmi st.~ - - - - 0.4 -~
Mouldad t3ansity (kg/mg) 450 440 440 580 490 585 Eardnesaf 46 51 41 62 47 N.M.*
(Asker C) (Asker C) (Asker C) (Asker C) (Shore A) (20 C)/E'(120 C) ratio 0.95 1.01 0.98 0.86 1.69 2.19 ta= ~(1C70 C) 0.002 0.013 0.024 0.005 0.070 0.078 tas5 ~ -23 -26 -11 -11 -43 -45 (tempeia+~urq ].h C) , ~ =
tan ~,.(~~u~~ 1.08 0.86 1.01 1.22 0.42 0.37 not measured The EI(20 C)/E(120 C) ratio of the elastomers according to the comparative examples is higher than 1.5 and their maxi *ry+lm value of the tan b is less than 0.8.
DMTA-test Measurements were carried out according to ISO/DIS 6721=-5 on a Rheometric Scientific DMTA apparatus using a 3-point bending method. Sasaple test dimensions were: length 1.0 cm, width 1.3 cm, thickness 0.4 cm. Applied strain amplitude 64 x 10-4 cm, trequency 1 Hz, heating xate 2 C/min. The =
elastomer sang,les were pre-conditioned at 23 C/50% RH f:or 24 hours prior testing. The elastomer samples were quenched to -120 C (cooling rate 8.5 C/min) and held at that temperature for 5 minutes before heating of the sample was started.
Figures 1-4 show the DNTA-curves of the examples 1-4. The DMTA-curves of the comparative examples 1 and 2 are shown in figures 5 and 6.
elastomer sang,les were pre-conditioned at 23 C/50% RH f:or 24 hours prior testing. The elastomer samples were quenched to -120 C (cooling rate 8.5 C/min) and held at that temperature for 5 minutes before heating of the sample was started.
Figures 1-4 show the DNTA-curves of the examples 1-4. The DMTA-curves of the comparative examples 1 and 2 are shown in figures 5 and 6.
Claims (36)
1. A polyisocyanate-based elastomer having a ratio of the storage modulus (E') at 20°C and the storage modulus (E') at 120°C of between 0.75 and 1.5, a tan 6 at 100°C of less than 0.1 and a maximum value of the tan b of more than 0.8, the tan 5 being the ratio of the loss modulus (E'') and the storage modulus (E').
2. The elastomer according to claim 1 wherein the polyisocyanate contains at least 90% by weight of 4,4'-diphenylmethane diisocyanate.
3. The elastomer according to claim 2 wherein the polyisocyanate contains at least 95% by weight of 4,4'-diphenylmethane diisocyanate.
4. The elastomer according to any one of claims 1 to 3 having a ratio of the storage modulus (E') at 20°C and the storage modulus (E') at 120°C of between 0.8 and 1.2.
5. The elastomer according to claim 4 having a ratio of the storage modulus (E') at 20°C and the storage modulus (E') at 120°C of between 0.85 and 1.1.
6. The elastomer according to any one of claims 1 to 5 having a tan 6 at 100°C of less than 0.05.
7. The elastomer according to claim 6 having a tan .delta.
at 100°C of less than 0.03.
at 100°C of less than 0.03.
8. The elastomer according to any one of claims 1 to 7 having a maximum value of the tan b of more than 1Ø
9. The elastomer according to any one of claims 1 to 8 having a prime maximum of the tan 5 at a temperature below 0°C.
10. The elastomer according to claim 9 having a prime maximum of the tan .delta. at a temperature below -10°C.
11. A method for the preparation of elastomers according to any one of claims 1 to 10 from a reaction mixture comprising a polyisocyanate component, a polyol composition, a chain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight of up to 250.
12. The method according to claim 11 wherein the polyol composition comprises at least one poly(oxyethylene-oxypropylene) polyol.
13. The method according to claim 12 wherein the polyol composition comprises:
(a) from 75 to 100% by weight of a first polyol component comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol component having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 1000 to 5000 and an average oxyethylene content of from 60 to 85% by weight, and (b) from 25 to 0% by weight of another polyol component.
(a) from 75 to 100% by weight of a first polyol component comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol component having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 1000 to 5000 and an average oxyethylene content of from 60 to 85% by weight, and (b) from 25 to 0% by weight of another polyol component.
14. The method according to any one of claims 11 to 13 wherein the polyol composition has an average nominal hydroxyl functionality of from 2 to 3.
15. The method according to any one of claims 11 to 14 wherein the reaction mixture further comprises water.
16. The method according to claim 15 wherein the amount of water is less than 2% by weight based on the total weight of the isocyanate-reactive compounds.
17. The method according to any one of claims 11 to 16 which is carried out at an isocyanate-index of between 90 and 110.
18. The method according to claim 17 which is carried out at an isocyanate-index of between 95 and 105.
19. A reaction system comprising:
(a) a polyisocyanate component containing at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof;
(b) a polyol composition comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average nominal hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight;
(c) a chain extender having an average hydroxyl equivalent weight of up to 250;
(d) water;
(e) a crosslinking agent, and (f) one or more additives conventional to elastomer formulations.
(a) a polyisocyanate component containing at least 85% by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof;
(b) a polyol composition comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average nominal hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight;
(c) a chain extender having an average hydroxyl equivalent weight of up to 250;
(d) water;
(e) a crosslinking agent, and (f) one or more additives conventional to elastomer formulations.
20. A polyisocyanate-based elastomer having a ratio of the storage modulus (E') at 20°C and the storage modulus (E') at 120°C of between 0.75 and 1.5, a tan .delta. at 100°C of less than 0.1 and a maximum value of the tan .delta. of more than 0.8, the tan .delta. being the ratio of the loss modulus (E'') and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5, wherein the elastomer is made from a reaction mixture comprising a polyisocyanate component, a polyol composition, a chain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85%- by weight of 4,4'-diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight of up to 250.
21. The elastomer according to claim 20, wherein the polyisocyanate contains at least 90t by weight of 4,4'-diphenylmethane diisocyanate.
22. The elastomer according to claim 21, wherein the polyisocyanate contains at least 95% by weight of 4,4'-diphenylmethane diisocyanate.
23. The elastomer according to any one of claims 20 to 22 having a ratio of the storage modulus (E') at 20°C and the storage modulus (E') at 120°C of between 0.8 and 1.2.
24. The elastomer according to claim 23 having a ratio of the storage modulus (E') at 20°C and the storage modulus (E') at 120°C of between 0.85 and 1.1.
25. The elastomer according to any one of claims 20 to 24 having a tan .delta. at 100°C of less than 0.05.
26. The elastomer according to claim 25 having a tan .delta.
at 100°C of less than 0.03.
at 100°C of less than 0.03.
27. The elastomer according to any one of claims 20 to 26 having a maximum value of the tan .delta. of more than 1Ø
28. The elastomer according to any one of claims 20 to 27 having a prime maximum of the tan 6 at a temperature below 0°C.
29. The elastomer according to claim 28 having a prime maximum of the tan .delta. at a temperature below -10°C.
30. A method for the preparation of polyisocyanate-based elastomers having a ratio of the storage modulus (E') at 20°C
and the storage modulus (E') at 120°C of between 0.75 and 1.5, a tan .delta. at 100°C of less than 0.1 and a maximum value of the tan .delta. of more than 0.08, the tan .delta. being the ratio of the loss modulus (E") and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5 wherein the elastomer is made from a reaction mixture comprising a polyisocyanate component, a polyol composition, a chain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4' -diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight up to 250.
and the storage modulus (E') at 120°C of between 0.75 and 1.5, a tan .delta. at 100°C of less than 0.1 and a maximum value of the tan .delta. of more than 0.08, the tan .delta. being the ratio of the loss modulus (E") and the storage modulus (E'), the storage and loss modulus being measured by Dynamic Mechanical Thermal Analysis according to ISO/DIS 6721-5 wherein the elastomer is made from a reaction mixture comprising a polyisocyanate component, a polyol composition, a chain extender and optionally a crosslinking agent wherein the polyisocyanate component contains at least 85% by weight of 4,4' -diphenylmethane diisocyanate or a variant thereof, the polyol composition comprises at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol composition having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 500 to 7000 and an average oxyethylene content of between 50 and 85% by weight, and the chain extender has an average hydroxyl equivalent weight up to 250.
31. The method according to claim 30 wherein the polyol composition comprises at least one poly(oxyethylene-oxypropylene)polyol.
32. The method according to claim 31 wherein the polyol composition comprises:
(a) from 75 to 100%- by weight of a first polyol component comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol component having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 1000 to 5000 and an average oxyethylene content of from 60 to 85W by weight, and (b) from 25 to 0% by weight of another polyol component.
(a) from 75 to 100%- by weight of a first polyol component comprising at least one polyoxyalkylene polyol containing oxyethylene residues, said polyol component having an average nominal hydroxyl functionality of from 2 to 4, an average hydroxyl equivalent weight of from 1000 to 5000 and an average oxyethylene content of from 60 to 85W by weight, and (b) from 25 to 0% by weight of another polyol component.
33. The method according to any one of claims 30 to 32 wherein the polyol composition has an average nominal hydroxyl functionality of from 2 to 3.
34. The method according to any one of claims 30 to 33 wherein the reaction mixture further comprises water.
35. The method according to claim 34 wherein the amount of water is less than 2% by weight based on the total weight of the isocyanate-reactive compounds.
36. The method according to any one of claims 30 to 35 which is carried out at an isocyanate-index of between 90 and 110.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP95203405.6 | 1995-12-08 | ||
| EP95203405 | 1995-12-08 | ||
| PCT/EP1996/005035 WO1997021750A1 (en) | 1995-12-08 | 1996-11-14 | Polyurethane elastomers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2239482A1 CA2239482A1 (en) | 1997-06-19 |
| CA2239482C true CA2239482C (en) | 2008-03-18 |
Family
ID=8220920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002239482A Expired - Lifetime CA2239482C (en) | 1995-12-08 | 1996-11-14 | Polyurethane elastomers |
Country Status (20)
| Country | Link |
|---|---|
| US (1) | US7307136B2 (en) |
| EP (1) | EP0865458B2 (en) |
| JP (2) | JP3892042B2 (en) |
| KR (1) | KR100441926B1 (en) |
| CN (1) | CN1210324C (en) |
| AR (1) | AR005001A1 (en) |
| AT (1) | ATE198756T1 (en) |
| AU (1) | AU718820B2 (en) |
| BR (1) | BR9611977A (en) |
| CA (1) | CA2239482C (en) |
| DE (1) | DE69611623T3 (en) |
| DK (1) | DK0865458T4 (en) |
| ES (1) | ES2153601T5 (en) |
| ID (1) | ID19591A (en) |
| MY (1) | MY129258A (en) |
| PL (1) | PL187124B1 (en) |
| PT (1) | PT865458E (en) |
| TR (1) | TR199801042T2 (en) |
| TW (1) | TW419489B (en) |
| WO (1) | WO1997021750A1 (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BR0009030B1 (en) * | 1999-03-17 | 2010-04-06 | process for preparing a polyurethane material in a mold, and flexibly molded polyurethane foam. | |
| EP1172387A1 (en) | 2000-07-14 | 2002-01-16 | Huntsman International Llc | Process for preparing an elastomer |
| US6734273B2 (en) * | 2001-02-12 | 2004-05-11 | Noveon Ip Holdings Corp. | High molecular weight thermoplastic polyurethanes made from polyols having high secondary hydroxyl content |
| US7687548B2 (en) | 2002-07-01 | 2010-03-30 | Huntsman International Llc | Process for preparing a moulded polyurethane material |
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1996
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