CN1972798A - Disposable containers coated with a latex coating - Google Patents

Disposable containers coated with a latex coating Download PDF

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Publication number
CN1972798A
CN1972798A CNA2004800408674A CN200480040867A CN1972798A CN 1972798 A CN1972798 A CN 1972798A CN A2004800408674 A CNA2004800408674 A CN A2004800408674A CN 200480040867 A CN200480040867 A CN 200480040867A CN 1972798 A CN1972798 A CN 1972798A
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CN
China
Prior art keywords
container
latex
latex paint
coated
molding thermoplastic
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CNA2004800408674A
Other languages
Chinese (zh)
Inventor
J·E·拉塞尔
D·A·考恩
D·H·皮斯帕宁
唐建生
M·T·威廉姆斯
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Nova Chemicals Inc
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Nova Chemicals Inc
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Filing date
Publication date
Application filed by Nova Chemicals Inc filed Critical Nova Chemicals Inc
Publication of CN1972798A publication Critical patent/CN1972798A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/34—Coverings or external coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B65D1/28—Thin-walled containers, e.g. formed by deep-drawing operations formed of laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D23/00—Details of bottles or jars not otherwise provided for
    • B65D23/08—Coverings or external coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4273—Auxiliary operations after the blow-moulding operation not otherwise provided for
    • B29C49/42828—Coating or painting the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2025/00—Use of polymers of vinyl-aromatic compounds or derivatives thereof as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0058—Liquid or visquous
    • B29K2105/0064—Latex, emulsion or dispersion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/048—Expandable particles, beads or granules
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2325/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02—Homopolymers or copolymers of hydrocarbons
    • C08J2325/04—Homopolymers or copolymers of styrene
    • C08J2325/06—Polystyrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

A molded thermoplastic container e.g. cup, bowl made from expandable thermoplastic particles e.g. expandable polystyrene, has a latex coating, e.g. latex of methyl methacrylate and styrene copolymer, latex of methyl acrylate and styrene copolymer, latex of acrylic acid and styrene copolymer, and latex of butadiene and styrene copolymer, applied to at least its inner surface via dipping, brushing or spraying processes for improved leakage and/or stain resistance and/or storage longevity. The coating may be applied to the outer surface of the container for leak resistance and printing purposes. A related method for forming the container, an article of manufacture, and an improved method for storing liquid and food substances are also disclosed.

Description

Be coated with the disposable container of latex paint
Background of invention
1. invention field
The present invention relates to disposable container.More particularly, the present invention relates to make and be coated with the molded plastic foam container of latex paint by for example expandable granules of polystyrene of thermoplastic granulates (EPS).This container is used to receiving fluids, for example, coffee or contain oil and/or the food of fat constituent, for example, the food that contains fat of the cooking in advance is as instant noodles, soup, fried chicken, baste etc.The invention still further relates to a kind of goods that are used for the method for container molding, a kind of production and a kind ofly be used for improving one's methods of storaging liquid and food.
2. background technology
For example cup, bowl etc. are very known to produce the molded plastic foam container by the thermoplastic granulates that expands.The most generally the thermoplastic granulates of Shi Yonging is expandable polystyrene (EPS) particle.
Generally speaking, with hydrocarbon for example pentane as blowing agent polystyrene bead is flooded, this blowing agent seethes with excitement below the softening point of polystyrene and bead is expanded when being heated.
Polystyrene bead shaping mould container made by dipping carries out with two steps usually.At first, make the bead of dipping be expanded to the density of about 2-12 pound/cubic feet in advance.Secondly, the bead heating that in closed die, will expand in advance so that in advance the bead of Peng Zhanging further expand and formation has the goods of the fusion of mold shape.
Usually be used to make the expandable granules of polystyrene of foam plastics container by the aqueous suspension polymerization process preparation, this makes can be sized to the gained bead relatively accurate bead size.Generally speaking, be used to make for example about 0.02 inch of the about 0.008-of original bead diameter of cup of container.Be well known that by the about 0.03 inch bead of diameter and made cup.
Although control bead size carefully, a problem that continues the trouble Container Industry is over time, container especially make by the EPS particle those tend to leak.That is to say that liquid, especially hot liquid for example coffee, water, oil and/or fat permeate and leaks on the outer surface of container around the polystyrene bead of fusion.Generally speaking, this has caused for the people who holds container unsafe situation and/or has caused spot occurring on the outer surface of container.Be well known that anti-leaks depends on temperature.That is to say that the liquid of heat is compared with cold material and can be permeated sooner with food around the bead of fusion.
Carried out several method these years to attempt to reduce in liquid that holds cold-peace heat and/or the leakage in the container of the food of the cooking in advance.
The United States Patent (USP) 4,036,675 of Amberg etc. has disclosed a kind of by expanded plastic material, the container that preferred expanded polystyrene (EPS) is made, and with non-oriented polyolefin film, optimization polypropylene is a lining on the one or both sides of this container.Use polyvinyls or polyamide film to be fixed on this foamed plastic class material as heat sensitive adhesive.With adhesive wet on this thin film coated, and dry before being pressed in thin layer on the foamed material.Lamination carries out in the following manner: foamed material is heated to 250-275 , the film that applies is preheated to 100-180 , and by use cold pressing plate or roller with the film surface that applies facing to heated foamed plastics compacting 10-15 second.
The United States Patent(USP) Nos. 4,703,065 and 4,720,429 of Sonnenberg has disclosed by surface-coated before molded has molded being used to of thermoplastic polymer particles of fluorine-containing surfactant to hold the thermoplastic polymer foam plastic cup of coffee.
The U.S. Patent No. 4,785,022 of Sonnenberg has disclosed a kind of method that is used to strengthen the coffee retentivity of molded plastic foam cup, and this method relates to multiple rubber polymer and copolymer and applies expandable granules of polystyrene.This rubber can be polybutene, polyisobutene, isobutene-butylene copolymer and butylene-ethylene copolymer.
For example butane, pentane, hexane and halogenated hydrocarbons have solved the problem that coffee leaks to the U.S. Patent No. 4,798,749 of Arch etc. by replace conventional blowing agent with isopentane in the expandable phenylethylene polymer beads.
The U.S. Patent No. 4 of Ikeda etc., 698,367 have disclosed expandable thermoplastic resin particle, and wherein the thermoplastic resin of being made up of ethylene fluoride based polyalcohol and hydrophilic vinyl polymer covers or is included on the surface of this expandable thermoplastic granulates or in the superficial layer.This resin particle can be used for producing the packing container that is used for oiliness or fat food.
U.S. Patent No. 6,277,491 B1 of Sakoda etc. are intended to prevent that oil is penetrated in the molded container of being made by expandable thermoplastic resin beads.This resin beads has been coated with or has mixed fluorine-containing block copolymer, and this copolymer comprises fluorine-containing vinyl class in polymer segment that is obtained from fluorine-containing vinyl monomer and the lipophilicity vinyl class in polymer segment that is obtained from the lipophilicity vinyl monomer.
The container of above prior art is used to polystyrene containers, for example cup or bowl.Following patent be coated with or contain be useful on adiabatic purpose or be used to produce the high impermeable thermoplastic resin membrane's of liquid dixie cup relevant.
For example, the U.S. Patent No. 4 of Suzuki etc., 206,249 have disclosed a kind of method with the impermeable paper container of high liquid that is used to produce, this method comprises: with the polymerisable solution spraying that contains prepolymer to paper wall of a container surface, and the wall that applies with ultraviolet ray irradiation so that prepolymer on this wall of a container surface, solidify.This has formed liquid for example water, milk, soft drink, the impermeable coating of wet goods.This patent is on the 2nd hurdle, and 45-62 is capable, and to have instructed a kind of inner wall surface of wherein container be method of lining with the thermoplastic film.At first thermoplastic film is laminated on the blank, and makes blank be shaped to container.
The U.S. Patent No. 4,435,344 of Iioka has disclosed a kind of its outer surface and inner surface and has extruded and be coated with or lamination has the sheathing paper container of thermoplasticity film of synthetic resin.On paper base material, resin film changed into foaming layer and make container formation.The result is the container that acquisition has good heat-insulating property.This film is polyethylene preferably, and as on the 3rd hurdle, such this resin film of being instructed during 50-55 is capable can be polypropylene, polyvinyl chloride, polystyrene, polyester, nylon etc.
The U.S. Patent No. 5 of Iioka etc., 490,631 have disclosed a kind of sheathing paper container that comprises type body member, wherein in the printing zone of outer surface, form the thick frothing heat-insulating layer of making by the thermoplasticity film of synthetic resin, and in the non-printing zone of outer surface, form the thin slightly frothing heat-insulating layer that to make by identical thermoplasticity film of synthetic resin.This thermoplasticity film of synthetic resin is polyethylene normally.
U.S. Patent No. 6,416,829 B2 of Breining etc. have disclosed a kind of adiabatic dixie cup, and its medium-sized body member is coated with the foamed low density polyethylene on its outer surface, and are coated with the not modified low-density polyethylene of foaming on the surface within it.
Related to without any one in these prior art containers and be coated with latex paint and be used to hold and/or storaging liquid and the food thermoplastic container of the food etc. of coffee, soup, stew, the cooking in advance for example.
Summary of the invention
Needs above the present invention has satisfied.A kind of thermoplastic container is molded by expandable thermoplastic granulates, and latex paint is coated on the inner surface of this container and at least one the part in the outer surface; Preferably be coated on the inner surface, more preferably be coated in inner surface and outer surface on the two.This container is impermeable relatively, has has substantially reduced or eliminated leakage thus, and has therefore prevented to form spot on vessel surface.
If be applied on the outer surface of container, also latex paint can be used for the purpose of mark and/or printing.
This latex paint can be selected from: the latex of the latex of the latex of the latex of methyl methacrylate and styrol copolymer, methyl acrylate and styrol copolymer, acrylic acid and styrol copolymer and butadiene and styrol copolymer.
The thickness of coating can be about 0.10 mil (dry-coated material weight/cm of 0.27mg 2The cup surface)-Yue 5.0 mils (dry-coated material weight/cm of 13.4mg 2Cup is surperficial), and preferably can be about 0.9 mil (dry-coated material weight/cm of about 0.25mg 2The cup surface).This coating can be coated on the part of interior and/or outer surface of container or be coated in container whole and/or on the outer surface.In one embodiment of the invention, basically coating is coated on the whole interior and/or outer surface of container.
For example latex paint is coated on the vessel surface by brushing method, dip-coating method or spraying method by airfree spray equipment (one or more).
Container is made by expandable thermoplastic resin beads, and this expandable thermoplastic resin is expandable polystyrene (EPS) in some embodiments.
Embodiments more of the present invention relate to the molding thermoplastic container that shows improved anti-leaks and/or stain resistance and improved insulating properties.
Embodiments more of the present invention relate to the latex paint on a kind of interior and/or outer surface that is applied to the molding thermoplastic container.
Other embodiments of the present invention relate to a kind of being used for latex paint are coated in method on the molding thermoplastic vessel surface.
And still other embodiments relate to a kind of goods that comprise the production of the molding thermoplastic container that is coated with latex paint and receiving fluids or food, and this container has improved storage life, improved stain resistance and/or improved anti-leaks.
To from following description and the appended claims, more fully understand and understand these and other aspect of the present invention.
Detailed Description Of The Invention
In the present invention, for example cup, bowl etc. are molded by expandable thermoplastic granulates for container.This expandable thermoplastic granulates can be made by any suitable thermoplastic homopolymer or copolymer.
What be particularly suitable for using is the homopolymers of derived from ethylene base aromatic monomer, and described monomer comprises: styrene, cumene ethene, AMS, nuclear methyl styrene, chlorostyrene, t-butyl styrene etc.; And by the copolymer of at least a vi-ny l aromatic monomers with the monomer copolymerization preparation of for example divinylbenzene, butadiene, alkyl methacrylate, alkyl acrylate, acrylonitrile and maleic anhydride, therein ethylene base aromatic monomer exists with the amount of the 50wt% at least of copolymer.
Optimization styrene base polymer, particularly polystyrene.Yet, can use other suitable polymers, for example polyolefin (as polyethylene, polypropylene) and Merlon, polyphenylene oxide and its mixture.
Preferably, expandable thermoplastic granulates is expandable polystyrene (EPS) particle.These particles can be that bead, particulate or other are convenient to expand and the form of the particle of molded operation.Particle with moisture suspension process polymerization is a sphere substantially, and is optimized for molded foam plastics container of the present invention.With these particle screenings so that their diameter is about 0.02 inch of about 0.008-.
Adopt the method for any routine expandable thermoplastic granulates to be flooded with suitable blowing agent.For example, can be by during polymer polymerizing, blowing agent being added aqueous suspension, that is perhaps selectively instructed in the U.S. Patent No. 2,983,692 as D.Alelio mixes blowing agent then and realizes dipping by making polymer beads be suspended in the water-bearing media neutralization once more like that.
Any gaseous material or the material that the time will produce gas when heating can be used as blowing agent.Conventional blowing agent is included in the aliphatic hydrocarbon that contains 4-6 carbon atom in the molecule, for example butane, pentane, hexane and halogenated hydrocarbons, for example, and CFC and HCFC, these blowing agents seethe with excitement under the temperature of the softening point that is lower than selected polymer.Also can use the mixture of aliphatic hydrocarbon blowing agent.
Selectively, as transfer the United States Patent(USP) Nos. 6,127,439 of NOVA Chemicals (International) S.A.; 6,160,027; With 6,242, instructed in 540 like that, can be with water with these aliphatic hydrocarbon blowing agent blend or water can be used as unique blowing agent.In above-mentioned patent, used water-loss reducer.The percentage by weight that is used as the water of blowing agent can be 1-20%.United States Patent(USP) Nos. 6,127,439,6,160,027 and 6,242,540 instruction content is hereby incorporated by with their full text.
Usually make the thermoplastic granulates of dipping be expanded to about 12 pounds/cubic feet density of about 2-in advance.Routinely by for example steam, hot-air, hot water or radiant heat heat the bead of dipping and carry out the step that this expands in advance by means of the heat medium of any routine.The method of in the U.S. Patent No. 3,023,175 of Rodman, having instructed a kind of received thermoplastic granulates that is used to make dipping to expand in advance.
As transfer the U.S. Patent Application Serial Number No.10/021 of the Arch etc. of NOVA Chemicals Inc, that is instructed in 716 is such, the thermoplastic granulates of dipping can be the cellular polymer particle of foaming, and the instruction content of this patent is hereby incorporated by in full with it.The polystyrene that the honeycomb particulate of this foaming is preferably such: it is expanded to about 34.3 pounds/cubic feet density of about 12.5-in advance, and it contains less than 6.0wt% based on the weight of polymer, the preferred about 5.0wt% of about 2.0-, more preferably from about the volatile foaming agent content of the about 3.5wt% of 2.5-.
The particle that will expand in advance in closed die (" the pre-material that expands ") heats so that particle further expands and forms foamed plastics molded container of the present invention in a usual manner.
Generally speaking, be applicable to that latex paint of the present invention is can not damage a class of the thermoplastic granulates that container molding uses.That is to say, latex paint of the present invention will not contain tend to dissolve or with thermoplastic granulates any chemical substance of granules of polystyrene reaction particularly.For example, most of solvent based polyalcohol coating will be infeasible in the present invention.
" latex " can be defined as polymer beads at the water-bearing media colloidal dispersion in the water for example.Compare (polymer phase: water) can be 40: 60-60: 40, by weight.In latex paint industry, a term more commonly used is " solid content "." solid content " used herein is meant the dry of the polymer that comprises in the latex paint, emulsifying agent, inorganic salts etc.Typical range of solid content is 40-60wt%.By under 100-140 ℃ temperature, latex paint sample drying to constant quality being obtained this measured value.Then solid content is expressed as the percentage of dry/sample gross mass.
Be used for latex of the present invention and can contain surfactant and/or other microcomponent.Usually the surfactant that uses for stable purpose can be the surfactant that is used for latex paint any of common general knowledge, for example sodium alkyl sulfate of sodium octyl, decyl sodium sulfonate, dodecyl sodium sulfate, sodium tetradecyl sulfate, sodium hexadecyl sulfate, lauryl sodium sulfate, branching, dodecyl ethoxylation sodium (2EO), dodecanol ethoxylate (5EO), dodecanol ethoxylate (7EO), dodecanol ethoxylate (8EO) etc.
The polymer of specially suitable latex paint of the present invention can be obtained from the monomer that is selected from following material: butadiene, n-butyl acrylate, isobutyl acrylate, 2-EHA, methyl acrylate, ethyl acrylate, 2-ethyl hexyl acrylate, vinyl acetate, vinyl chloride, vinylidene chloride, new vinyl acetate acid, vinyl neodecanoate, acrylonitrile, methacrylonitrile, acrylamide, styrene, AMS, methyl methacrylate, EMA, n-BMA, isobutyl methacrylate; Perhaps this polymer can be selected from the homopolymers of above monomer, or the copolymer of two or more monomers, perhaps two or more monomers and following functional monomer's copolymer, described functional monomer comprises: acrylic acid, methacrylic acid, itaconic acid, fumaric acid, hydroxy-ethyl acrylate, hydroxyethyl methacrylate, diethyl aminoethyl methacrylate, t-butylaminoethyl methacrylate, acrylamide, between dimethyl-isopropenyl benzyl isocyanate ester, N hydroxymethyl acrylamide, the N-methylol methacrylamide, N-(isobutoxy methyl) acrylamide, glycidyl acrylate, GMA, SSS.
This latex paint can be formed with the copolymer that vinyl acetate or styrene combine by being selected from acrylate, ethyl acrylate, methyl methacrylate, methacrylate, acrylic acid, methacrylic acid, polymer of monomers or these monomers.
The latex of latex, acrylic acid and the styrol copolymer of latex, methyl acrylate and styrol copolymer that preferred latex paint is methyl methacrylate and styrol copolymer and the latex of butadiene and styrol copolymer.
The molecular weight of this latex paint can be about 100-about 1 * 10 6(500-about 200 * 10 in unit 6G/mol).The molecule polydispersity of this latex paint can be defined as the scope from very narrow to non-constant width, that is, about 1.0-about 20.
Thermoplastic container can be the polystyrene cup of making by the conventional cup make-up machine with hypostracum and outer shell.Conventional cup make-up machine is by the Cup Production model 6-VLC-125 machine of Autonational B.V. production or by Master Machine﹠amp; The model M10 cup machine that ToolCo produces.
In the present invention, behind container formation, latex paint is coated at least one the part in inner surface and the outer surface, preferred inner surface, more preferably inner surface and outer surface the two.Preferably, latex paint is coated in whole basically in and/or outer surface on.
Can comprise that dip-coating method, brushing method or spraying method are coated in latex paint on the surface (one or more) of container by means of any suitable device by any suitable method.From viewpoint economic and that produce, preferred spraying method.
Being specially adapted to latex paint type of the present invention is made up of the polymer and the water of solid particulate form.The initial solid content of polymer can be the about 50wt% of about 48-, it can be regulated changing viscosity so that process equipment for example paint finishing can handle the coating of coating on container fully.
The solid content of latex before being applied on the vessel surface will depend on usually and be used for the method for latex-coating on container.For example, if adopt spraying method or brushing method, then preferred solid content will be the about 47wt% of about 40-based on latex weight.If the employing dip-coating method, then preferred solid content will be the about 20wt% of about 8-.
With after latex-coating is on vessel surface (one or more), can container be delivered to hothouse or drying box by conveyer belt then.Drying box can be conventional baking oven, and heat medium can be hot-air, radiant heat or heating in vacuum.Preferably, heat medium is a hot-air.Typical drying box is from Blue M Electric Company, Blue Island, and Illinois obtains.The solid content and the coating layer thickness that depend on baking temperature, coating drying time.If for example coating is 1.5 mils, then baking temperature will be about 60 seconds for about 90 ℃ and drying time.Generally speaking, for for the coating of the about 47wt% of about 8-, baking temperature will be about 50 ℃-Yue 100 ℃, and will be about 5 seconds-Yue 3000 seconds drying time for solid content.
As described herein, the thickness of the latex paint on vessel surface (one or more) can be about 0.10 mil (dry-coated material weight/cm of 0.27mg 2The cup surface)-Yue 5.0 mils (dry-coated material weight/cm of 13.4mg 2Cup is surperficial), and preferably can be about 0.9 mil (dry-coated material weight/cm of 0.25mg 2The cup surface).This coating layer thickness can be on the part of the interior and/or outer surface of container or basically in container whole and/or extend on the outer surface.
In a preferred embodiment of the invention, by spraying method with latex-coating on container.Be used for the throughput rate of the single spray equipment of latex spray on 16 ounces cup inner surface can be about 600 cups per minute of about 50-.Obviously, can use several spray equipments to be adapted to required cup throughput rate.
Can be used for spray equipment of the present invention is can be from the airless spray unit of Nordson Corporation acquisition.An example of the spray equipment that is provided by Nordson Corporation is disclosed in the U.S. Patent No. 4,206,249 of aforesaid Suzuki etc.In this case, preferably at room temperature rather than as U.S. Patent No. 4,206, use airless spray unit to apply latex under the temperature of 249 risings of being instructed.It should be understood that when spraying latex paint of the present invention, can carry out small change the spray equipment of ' 249 patents.
Coating rate can be defined as " being sprayed on the dry weight of the coating on the per surface area of container ".As described herein, coating rate can be the dry-coated material weight/cm of the about 13.4mg of about 0.27mg- 2The cup surface.
With latex-coating on the inner surface of container and at least one the part in the outer surface or be coated in basically on the inner surface of container and in the outer surface at least one to form coating; Preferably be coated on the inner surface; More preferably be coated in inner surface and outer surface on the two.
Latex paint can be applied on the outer surface with the purpose that is used for anti-leakage and/or be used for mark and the purpose of printing.Will be appreciated that container has sidewall and bottom, and " inner surface " and " outer surface " will be meant sidewall and bottom two parts of container usually.
Further set forth the present invention by following examples, but the present invention is not limited to following examples.
Embodiment
Embodiment 1
This embodiment for example understands the preparation of the container of latex-coating.Expandable polystyrene cup bead (is obtained from NOVA Chemicals, the DYLITE of Inc. Bead, it comprises polystyrene and pentane) and the zinc stearate blend, and under atmospheric pressure in the pre-decompressor of Rodman steam (Artisan Industries Inc.) of 11 gallons (about 1.5 cubic feet), expand in advance.This expands in advance and carries out in batches.Use 3.5 pounds of diameters to be distributed as about 0.008 inch-Yue 0.02 inch cup bead to make about 3.5 pounds/cubic feet pre-expansion material of density.With dry 5 minutes of this pre-expansion material air for preparing recently removing moisture, and before molding aging about 4 hours.
Cup by 16 ounces of this aging pre-expanded beads moldings.Steam header pressure is 80 pounds/square inch, and be 6-15 second total circulation timei.Make molded foamed plastics cup age overnight.
The airless spray unit that employing is produced and sold by Nordson Corporation is at the dry-coated material weight/cm of 1.7-4.3mg 2Under the coating rate on cup surface latex (produced and commercially available Roymal 45526 products by RoymalIncorporated, it is the latex of methyl acrylate, acrylic acid and styrol copolymer) is sprayed on the inner surface of cup, that is, and sidewall and bottom.For this emulsion products, based on the weight of polymer segment, the ratio of styrene and methyl acrylate can be about 5: 95wt%-about 95: 5wt%, and can be about 0-10wt% in total polymer weight acrylic acid.This latex contains the solid of 48wt%.
With latex-coating before on the inner surface, with latex with the deionized water dilution to make the latex that contains the 46wt% solid.
In baking oven, adopt down hot air circulate and photothermal combination with dry 1 minute of the cup that applies then at 90 ℃.Before test, the cup storage that applies is spent the night.
Test the cup that applies by the following method: the oil that at room temperature will be added with spices (spicy) is poured in each container cup is filled to about 80% of its capacity.For initial 1.5 hours per 10 minutes, in 1.5 hours-6 hours time range per 30 minutes, and then for total greasy dirt stain of per hour observing each container outer surface in 48 hours with leak.
By out-of-service time addition, and calculated the mean time to failure, MTTF (ATF) of each group cup sample total out-of-service time divided by the number of container of test with each container.Generally speaking, 10 cups of test in each group.Maximum ATF value is to mean in this group in 48 hours to show any spot or leakage without any a cup.Minimum ATF value is to mean that cups all in this group lost efficacy in 0.17 hour in initial 10 minutes.
Oil retention (ATF) the results are shown in the table 1.As illustrated, the cup that has latex paint has the ATF that compares raising with the cup that does not have latex paint (reference).
Table 1
Coating rate (mg/cm 2) 0 1.7 2.5 3.8 4.3
ATF (hour) 0.83 38.9 48 48 48
Note Reference
Embodiment 2
The EPS cup is 6 ounces a cup.Carry out the oil retention test (ATF) that these pre-density on expansion are 3.5 pounds/cubic feet EPS cup in the mode that is similar to embodiment 1.
Employed identical among the type of latex paint and the embodiment 1.With coating at first dilute with water to make coating with different solid contents.Make molded foamed plastics cup be coated with the latex that is covered with dilution by dip-coating method, so that the inner surface of cup and outer surface are all coated.Before test with the cup that applies dried overnight at room temperature.The results are shown in the table 2.
The cup that has latex paint has the ATF that compares raising with the cup that does not have latex paint (reference).
Table 2
Coating layer thickness 6.0μ 9.0μ 12.0μ
Solid content (%) - 8.08 12.13 16.17
ATF (hour) 0.83 16.4 48 48
Note Reference
Embodiment 3
Repeat the step of embodiment 1, except method of testing is replaced by following method.
Test the cup of four coatings by the following method: 1) with fried preformed cup face, for example those that can obtain on market are placed in each cup.2) the 3g Paprika is spread on the surface of face equably.3) each cup is closely sealed with adhesive-stick type label and elasticity of plastics film, and be placed in the baking oven under 149  (65 ℃) temperature.4) at first in 7 hours, per hour check the spot of each sample, then for 72 hours or check in 3 days then per 8 hours altogether once up to inefficacy.
With similarly calculate mean time to failure, MTTF (ATF) described in the embodiment 1 like that.Maximum ATF value is to show in this group glass sample in 72 hours to show any spot or leakage without any a cup.Minimum ATF value is to show that all cups lost efficacy in this group glass sample in 1 hour in initial 1 hour.
Stain resistance according to ATF the results are shown in the table 3.
Table 3
Coating rate (mg/cm 2) 0 3.8
ATF (hour) 1.8 72.0
Note Reference
As shown in table 3, the cup that has latex paint is compared the ATF with raising for the mixture of frying surface and Paprika with the cup that does not have latex paint (reference).
Embodiment 4
Repeat the step of embodiment 1, except method of testing is replaced by following method.
Test the cup that applies by the following method: at room temperature Salsa baste-a kind of spicy baste is poured in each container cup is filled to about 90% of its capacity.For per spot and leakage of observing each container outer surface in 1 hour in 48 hours altogether.
By out-of-service time addition, and calculated the mean time to failure, MTTF (ATF) of each group cup sample total out-of-service time divided by the number of container of test with each container.Generally speaking, 5 cups of test in each group.Maximum ATF value is to mean in this group in 48 hours to show any spot or leakage without any a cup.Minimum ATF value is to mean that cups all in this group lost efficacy in 1 hour in initial 1 hour.
Stain resistance according to ATF the results are shown in the table 4.
Table 4
Coating rate (mg/cm 2) 0 3.8
ATF (hour) 2.0 48.0
Note Reference
As shown in table 4, the cup that has latex paint is compared the ATF with raising for the Salsa baste with the cup that does not have latex paint (reference).
Although described the present invention according to its particular especially, but for those skilled in the art, it is evident that and to make many changes and modification to the present invention, only otherwise depart from as defined the present invention in the appended claims.For example, dissimilar latex paints can be coated on one or more surfaces of container with one or more layers.

Claims (24)

1. one kind is used for receiving fluids and food and has inner surface and the molding thermoplastic container of outer surface, and it comprises:
Be used for applying the latex paint at least one at least a portion of the described inner surface of the described molding thermoplastic container of being applied to of described container and outer surface.
2. the molding thermoplastic container of claim 1, wherein said molding thermoplastic container is made by expandable thermoplastic granulates.
3. the molding thermoplastic container of claim 2, wherein said expandable thermoplastic granulates is expandable granules of polystyrene.
4. the molding thermoplastic container of claim 1, wherein said latex paint constitutes by being selected from following monomer: butadiene, n-butyl acrylate, isobutyl acrylate, 2-EHA, methyl acrylate, ethyl acrylate, 2-ethyl hexyl acrylate, vinyl acetate, vinyl chloride, vinylidene chloride, new vinyl acetate acid, vinyl neodecanoate, acrylonitrile, methacrylonitrile, acrylamide, styrene, AMS, methyl methacrylate, EMA, n-BMA, isobutyl methacrylate.
5. the molding thermoplastic container of claim 4, wherein said latex paint constitutes by being selected from following polymer: the homopolymers of described monomer, the copolymer of two or more described monomers, with two or more described monomers and following functional monomer's copolymer, described functional monomer comprises: acrylic acid, methacrylic acid, itaconic acid, fumaric acid, hydroxy-ethyl acrylate, hydroxyethyl methacrylate, diethyl aminoethyl methacrylate, t-butylaminoethyl methacrylate, acrylamide, between dimethyl-isopropenyl benzyl isocyanate ester, N hydroxymethyl acrylamide, the N-methylol methacrylamide, N-(isobutoxy methyl) acrylamide, glycidyl acrylate, GMA, SSS.
6. the molding thermoplastic container of claim 1, wherein said latex paint is formed with the copolymer that vinyl acetate or styrene combine by being selected from acrylate, ethyl acrylate, methyl methacrylate, methacrylate, acrylic acid, methacrylic acid and polymer of monomers or described monomer.
7. the molding thermoplastic container of claim 1, wherein said latex paint is selected from: the latex of the latex of the latex of the latex of methyl methacrylate and styrol copolymer, methyl acrylate and styrol copolymer, acrylic acid and styrol copolymer and butadiene and styrol copolymer.
8. the molding thermoplastic container of claim 7, wherein said latex paint is the latex of methyl acrylate and styrol copolymer.
9. the molding thermoplastic container of claim 1, the thickness of wherein said latex paint is about 0.10 mil-Yue 5.0 mils.
10. the molding thermoplastic container of claim 1 wherein is coated in described latex paint on the described surface of described container by spraying method, and the solid content that wherein said latex paint has when dilution is the about 47wt% of about 40-.
11. the molding thermoplastic container of claim 1 wherein is coated in described latex paint on the described surface of described container by dip-coating method, and the solid content that wherein said latex paint has when dilution is the about 20wt% of about 8-.
12. the molding thermoplastic container of claim 1 wherein is coated in described latex paint on the described surface of described container by brushing method, and the solid content that wherein said latex paint has when dilution is the about 47wt% of about 40-.
13. the molding thermoplastic container of claim 1, wherein said latex paint is made up of solid phase and water, and wherein based on the weight of latex paint, described solid phase is about 50wt%.
14. a method that is used for the container that moulding receiving fluids and food uses, its step comprises:
Make molding thermoplastic container formation with inner surface and outer surface and
Latex paint is coated on the described inner surface of described container and at least one at least a portion in the described outer surface so that described container to described liquid and anti-leakage of food and/or anti-pollution.
15. the method for claim 14, its step further comprises:
Described latex paint is coated on the described inner surface of described container.
16. the method for claim 14, its step further comprises:
Described latex paint is coated on the described outer surface of described container.
17. the method for claim 14, wherein said latex paint is selected from: the latex of the latex of the latex of the latex of methyl methacrylate and styrol copolymer, methyl acrylate and styrol copolymer, acrylic acid and styrol copolymer and butadiene and styrol copolymer.
18. the method for claim 14, wherein said latex paint are the latex of methyl acrylate and styrol copolymer.
19. the method for claim 14 wherein is coated in described latex paint on the described container by spraying method.
20. the method for claim 14 wherein is coated in described latex paint on the described container by dip-coating method.
21. the method for claim 14 wherein is coated in described latex paint on the described container by brushing method.
22. the goods of a production, it has improved storage life, improved stain resistance and/or improved anti-leaks, and it comprises:
Be coated with the molding thermoplastic container of latex paint and receiving fluids material or food.
23. the goods of the production of claim 22, wherein said container has improved stain resistance.
24. the container by use claim 1 comes improving one's methods of storaging liquid and food.
CNA2004800408674A 2003-12-22 2004-12-16 Disposable containers coated with a latex coating Pending CN1972798A (en)

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BRPI0417963A (en) 2007-03-27

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