WO2000058380A1 - Glasklares, schlagzähes polystyrol auf basis von styrol-butadien-blockcopolymeren - Google Patents
Glasklares, schlagzähes polystyrol auf basis von styrol-butadien-blockcopolymeren Download PDFInfo
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- WO2000058380A1 WO2000058380A1 PCT/EP2000/002568 EP0002568W WO0058380A1 WO 2000058380 A1 WO2000058380 A1 WO 2000058380A1 EP 0002568 W EP0002568 W EP 0002568W WO 0058380 A1 WO0058380 A1 WO 0058380A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F293/00—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule
- C08F293/005—Macromolecular compounds obtained by polymerisation on to a macromolecule having groups capable of inducing the formation of new polymer chains bound exclusively at one or both ends of the starting macromolecule using free radical "living" or "controlled" polymerisation, e.g. using a complexing agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F297/00—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer
- C08F297/02—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type
- C08F297/04—Macromolecular compounds obtained by successively polymerising different monomer systems using a catalyst of the ionic or coordination type without deactivating the intermediate polymer using a catalyst of the anionic type polymerising vinyl aromatic monomers and conjugated dienes
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions 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; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/06—Polystyrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L51/00—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L51/003—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to macromolecular compounds obtained by reactions only involving unsaturated carbon-to-carbon bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
Definitions
- the invention relates to block copolymers containing at least two hard blocks Si and S made of vinyl aromatic monomers and at least one intermediate soft block B / S made of vinyl aromatic monomers and dienes, the proportion of hard blocks being over 40% by weight, based on the total block copoly he is.
- the invention further relates to a process for the preparation of the block copolymers and their use.
- No. 4,939,208 describes linear, transparent styrene-butadiene block copolymers of the structure S ⁇ -B ⁇ -B / SS 2 .
- the length of the B / S segment depends on the amount of Lewis base.
- Blocks B / S contain a styrene gradient (tapered block).
- the statistical proportion in the blocks can be increased by adding polar compounds, such as tetrahydrofuran as a randomizer.
- the polymerization of styrene and butadiene in the presence of small amounts of tetrahydrofuran as a randomizer leads to a high proportion of homo-polybutadiene blocks and a smeared transition to the polystyrene block. If the amount of tetrahydrofuran is increased, more or less statistical butadiene-styrene copolymer blocks are obtained, but at the same time the relative proportion of 1,2-linkages of the polydiene (1,2-vinyl content) is greatly increased.
- the high 1, 2-vinyl content affects the thermal stability of the corresponding block copolymer and increases the glass transition temperature.
- the object of the present invention was therefore to provide a crystal-clear, impact-resistant polystyrene with a balanced toughness / rigidity ratio, which does not have the aforementioned disadvantages.
- the impact-resistant polystyrene should have high intrinsic thermal stability and reduced tixotropy. Compatibility with styrene polymers should also be given in order to obtain transparent mixtures. The efficiency for impact modification of styrene polymers, especially standard polystyrene, should be increased.
- block copolymers containing at least two hard blocks S ⁇ and S made from vinyl aromatic monomers and at least one statistical soft block B / S in between made from vinyl aromatic monomers and dienes, the proportion of hard blocks being over 40% by weight, based on the entire block - is copolymer found.
- the 1,2-vinyl content in the soft block B / S is below 20%
- Vinyl content is understood to mean the relative proportion of 1,2-linkages of the diene units, based on the sum of the 1,2-, 1,4-cis and 1,4-trans linkages.
- the 1,2-vinyl content of the soft blocks is preferably in the range of 10-20%, in particular 12-16%.
- vinyl aromatic monomers both for the hard blocks Si and S 2 and for the soft blocks B / S styrene, ⁇ -methylstyrene, p-methylstyrene, ethylstyrene, tert. -Butylstyrene, vinyltoluene or mixtures thereof can be used.
- Styrene is preferably used.
- Butadiene, isoprene, 2, 3-dimethylbutadiene, 1, 3-pentadiene, 1, 3-hexadienes or piperylene or mixtures thereof are preferably used as dienes for the soft block B / S.
- 1,3-Butadiene is particularly preferably used.
- the block copolymer preferably consists exclusively of hard blocks Si and S 2 and at least one statistical soft block B / S and contains no homopolydiene blocks B.
- Preferred block copolymers contain external hard blocks Si and S with different block lengths.
- the molecular weight of Si is preferably in the range from 5000 to 30,000 g / mol, in particular in the range from 10,000 to 20,000 g / mol.
- the molecular weight of S 2 is preferably over 35000 g / mol.
- Preferred molecular weights of S are in the range from 50,000 to 150,000 g / mol.
- the block copolymers can have a linear or a star-shaped structure.
- a structure is preferred as the linear block copolymer
- the molar ratio of vinyl aromatic monomer to diene S / B in block (B / S) is preferably below 0.25 and in block (B / S) 2 is preferably in the range from 0.5 to 2.
- Star-shaped block copolymers are preferably those with a structure of at least one star branch from the block sequence S ⁇ - (B / S) and one star branch of the block sequence S 2 - (B / S) or those with at least one star branch of the block sequence S ⁇ - (B / S ) -S 3 and at least one star branch of the block sequence S 2 - (B / S) -S 3 .
- S 3 stands for a further hard block from the vinyl aromatic monomers mentioned.
- the molar ratio of vinyl aromatic monomer to diene S / B in the outer block (B / S) is preferably in the range from 0.5 to 2 and in the inner block
- (B / S) preferably below 0.5. Due to the higher content of vinyl aromatic monomers in the outer statistical block (B / S) ⁇ the block copolymer becomes more ductile with an unchanged total butadiene content, which has proven to be particularly advantageous in blends with standard polystyrene.
- the star-shaped block copolymers with the additional inner block S 3 have a higher stiffness with comparable ductility.
- the block S 3 thus acts like a filler in the soft phase without changing the ratio of hard phase to soft phase.
- the molecular weight of the blocks S 3 is generally much lower than that of the blocks Si and S 2 .
- the molecular weight of S 3 is preferably in the range from 500 to 5000 g / mol.
- the block copolymers according to the invention can be formed, for example, by sequential anionic polymerization, at least the polymerization of the soft blocks (B / S) taking place in the presence of a radomizer.
- the presence of randomizers causes the statistical distribution of the dienes and vinyl aromatic units in the soft block (B / S).
- Suitable randomizers are donor solvents, such as ethers, for example tetrahydrofuran, or tert-amine or soluble potassium salts.
- ethers for example tetrahydrofuran, or tert-amine or soluble potassium salts.
- amounts of generally more than 0.25 percent by volume, based on the solvent are used in the case of tetrahydrofuran.
- so-called "tapered" blocks with a gradient in the composition of the comonomers are obtained.
- the relative proportion of the 1,2-linkages of the diene units simultaneously increases to about 30 to 35%.
- the 1,2-vinyl content in the soft blocks increases only insignificantly.
- the block copolymers obtained are therefore less susceptible to crosslinking and have a lower glass transition temperature with the same butadiene content.
- the potassium salt is generally used in molar deficiency with respect to the anionic polymerization initiator.
- a molar ratio of anionic polymerization initiator to potassium salt is preferably selected in the range from 10: 1 to 100: 1, particularly preferably in the range from 30: 1 to 70: 1.
- the potassium salt used should generally be soluble in the reaction medium. Suitable potassium salts are, for example, potassium alcoholates, in particular a potassium alcoholate of a tertiary alcohol with at least 5 carbon atoms.
- the potassium alcoholates are accessible, for example, by reacting elemental potassium, potassium / sodium alloy or potassium alkylates and the corresponding alcohols in an inert solvent.
- the potassium salt is expediently added to the reaction mixture only after the addition of the anionic polymerization initiator. In this way, hydrolysis of the potassium salt by traces of protic impurities can be avoided.
- the potassium salt is particularly preferably added shortly before the polymerization of the statistical soft block B / S.
- the usual mono-, bi- or multifunctional alkali metal alkyls, aryls or aralkyls can be used as the anionic polymerization initiator.
- Organic lithium compounds are expediently used, such as ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert. -Butyl-, phenyl-, diphenylhexyl-, hexamethyldi-, butadienyl-, isoprenyl-, polystyrene lithium, 1,4-dilithiobutane, 1,4-dilithio-2-butene or 1,4-dilithiobenzene.
- the amount of polymerization initiator required depends on the desired molecular weight. As a rule, it is in the range from 0.001 to 5 mol%, based on the total amount of monomer.
- a polymerization initiator is added at least twice.
- the vinyl aromatic monomer S a and the initiator I Initi are preferably added at the same time in the reactor and polymerized completely, and then again at the same time again vinyl aromatic monomer St and initiator I 2 .
- the block Si is formed from the doses of the vinyl aromatic monomers S and S ⁇ , the block S 2 and S 3 solely by the doses S and S c .
- the molar initiator ratio I 2 / I ⁇ is preferably in the range from 4/1 to 1/1, particularly preferably in the range from 3.5 / 1 to 1.5 / 1.
- the polymerization can be carried out in the presence of a solvent.
- Suitable solvents are the aliphatic, cycloaliphatic or aromatic hydrocarbons with 4 to 12 carbon atoms, such as pentane, hexane, heptane, cyclohexane, methylcyclohexane, iso-octane, benzene, alkylbenzenes, such as toluene, xylene, ethylbenzene or decalin, or suitable mixtures, which are customary for anionic polymerization . Cyclohexane and methylcyclohexane are preferably used.
- the polymerization can also be carried out without solvents.
- Suitable chain terminators are proton-active substances or Lewis acids, such as water, alcohols, aliphatic or aromatic carboxylic acids, and inorganic acids such as carbonic acid or boric acid.
- the living polymer chains can also be linked in a star shape by polyfunctional coupling agents, such as polyfunctional aldehydes, ketones, esters, anhydrides or epoxides.
- polyfunctional coupling agents such as polyfunctional aldehydes, ketones, esters, anhydrides or epoxides.
- symmetrical and asymmetrical star block copolymers can be obtained, the arms of which can have the block structures mentioned above.
- Unsymmetrical star block copolymers are accessible, for example, by producing the individual star branches separately or by multiple initiation, for example double initiation with division of the initiator in a ratio of 2/1 to 10/1.
- the block copolymers according to the invention show the behavior of crystal clear, impact-resistant polystyrene with a balanced toughness / rigidity ratio. Because of the statistical soft block B / S, the block copolymers according to the invention, with the same diene content, are more thermostable and ductile than corresponding block copolymers with a "tapered" B / S block.
- the block copolymers with a low 1,2-vinyl content produced in the presence of a potassium salt have a particularly high intrinsic thermal stability.
- the block copolymers according to the invention also have good compatibility with other styrene polymers and can therefore be processed into transparent polymer mixtures.
- the block copolymers or polymer mixtures according to the invention can be used for the production of fibers, films and moldings.
- the melt volume rate MVR (200 ° C / 5 kg) was determined in accordance with ISO 1133.
- test specimens for the mechanical tests were injection molded at a melt temperature of 220 ° C and a mold temperature of 45 ° C.
- the modulus of elasticity, yield stress, breaking stress, elongation at break and elongation at break were determined in a tensile test according to ISO 527 with tensile bars according to ISO 3167.
- VST / A and VST / B were determined according to the test specification DIN ISO 306.
- the molecular weights were determined by means of gel permeation chromatography (GPC) on polystyrene gel columns of the Mixed B type from Polymer Labs, using monodisperse polystyrene standards at room temperature and tetrahydrofuran as the eluent.
- GPC gel permeation chromatography
- the 1,2-vinyl content was determined by means of FT-IR spectroscopy.
- Linear styrene-butadiene block copolymers with the structure S ⁇ - (B / S) ⁇ ⁇ (B / S) 2 -S 2 were obtained by sequential anionic polymerization of styrene and butadiene in cyclohexane as a solvent at 60 - 90 ° C.
- 598 l of cyclohexane and 1.235 l of a 1.5 molar sec-butyl-lithium solution (n-hexane / cyclohexane) were placed in a 1500 l stirred reactor and the amount of styrene required for the preparation of the block Si was metered in.
- Table 2 Mechanical data (specimen punched out of press plate) for the linear styrene-butadiene block copolymers from Examples 1 to 5
- Star-shaped styrene-butadiene block copolymers of structures I and II were obtained by sequential anionic polymerization of styrene and butadiene in cyclohexane as a solvent at 60 to 90 ° C. and subsequent coupling with epoxidized linseed oil (Edenol B 316 from Henkel).
- the block referred to in the description as Si corresponds to S # S is formed from S a - S and S 3 corresponds to S c .
- x represents the rest of the coupling agent
- cyclohexane and sec-butyllithium which had been titrated with sec-butyllithium, were placed in a 10-1 stirred reactor and the amount of styrene (styrene I) required to produce block S a was metered in. It was then initiated again with sec-butyllithium (sec-BuLi II) and the appropriate amount of styrene (styrene II) was metered in for blocks S.
- the blocks (B / S) were added by adding a mixture of styrene (styrene III) and butadiene.
- styrene III styrene III
- butadiene a further styrene block S c (styrene IV) was polymerized on.
- the block copolymers obtained were then coupled with Edenol B 316.
- the dosage of the starting materials is shown in Table 3 and the composition of the blocks and the physical and mechanical properties of the block copolymers are shown in Table 4.
- KTA Potassium tertiary amylate
- Example 9 was repeated with the difference that 3.62 ml of a 0.1 molar solution of potassium tetrahydrolinaloolate in cyclohexane were used as the randomizer.
- S b The block referred to as Si in the description corresponds to S b .
- S 2 is formed from S a and S b and S 3 corresponds to S c .
- star-shaped styrene-butadiene block copolymers of structures I, Ib, Ilb and III were obtained by sequential anionic polymerization of styrene and butadiene with the amounts and metering sequence given in Table 6.
- the block copolymers obtained were then coupled with Edenol B 316 (tetrafunctional) or diethyl carbonate (trifunctional).
- the physical and mechanical properties are summarized in Table 7.
- the block copolymers of Examples 12 to 20 were each mixed with standard polystyrene (PS 158K from BASF) in a weight ratio of 30/70 (block copolymer / PS).
- PS 158K standard polystyrene
- Table 7 Physical and mechanical properties of the star-shaped styrene-butadiene block copolymers of Examples 12 to 19
- Table 8 Physical and mechanical properties of the blends from block copolymers of Examples 12 to 19 with GPPS
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- Inorganic Chemistry (AREA)
- Graft Or Block Polymers (AREA)
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Abstract
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Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914075A DE19914075A1 (de) | 1999-03-27 | 1999-03-27 | Glasklares, schlagzähes Polystyrol auf Basis von Styrol-Butadien-Blockcopolymeren |
US09/471,288 US6521712B1 (en) | 1999-03-27 | 1999-12-23 | Glass-clear impact-modified polystyrene based on styrene-butadiene block copolymers |
MXPA01009680 MX222345B (es) | 1999-03-27 | 2000-03-23 | Poliestireno transparente, resistente a los impactos, basado en un copolimero de bloques de estireno-butadieno. |
BRPI0009361-0A BR0009361B1 (pt) | 1999-03-27 | 2000-03-23 | copolìmero em bloco, mistura polimérica, processo para preparar copolìmeros em bloco, e, uso dos copolìmeros em bloco ou misturas de polìmeros. |
DE50013607T DE50013607D1 (de) | 1999-03-27 | 2000-03-23 | Glasklares, schlagzähes polystyrol auf basis von styrol-butadien-blockcopolymeren |
JP2000608672A JP3976505B2 (ja) | 1999-03-27 | 2000-03-23 | スチレンブタジエンブロック共重合体を基礎とした透明耐衝撃性改良ポリスチレン、これを含む重合体混合物、これらの製造方法および使用方法 |
KR20017012254A KR100602971B1 (ko) | 1999-03-27 | 2000-03-23 | 스티렌-부타디엔 블럭 공중합체를 기재로 한, 유리처럼투명하고 충격성이 개량된 폴리스티렌 |
US09/936,784 US6593430B1 (en) | 1999-03-27 | 2000-03-23 | Transparent, impact-resistant polystyrene on a styrene-butadiene block copolymer basis |
UA2001107325A UA72512C2 (en) | 1999-03-27 | 2000-03-23 | Transparent, crashproof polystyrene based on butadiene-styrene block copolymers and a method for producing thereof |
HU0201377A HUP0201377A3 (en) | 1999-03-27 | 2000-03-23 | Transparent, impact-resistant polystyrene on a styrene-butadiene block copolymer basis |
CA002368312A CA2368312C (en) | 1999-03-27 | 2000-03-23 | Transparent, impact-resistant polystyrene on a styrene-butadiene block copolymer basis |
PL350996A PL197792B1 (pl) | 1999-03-27 | 2000-03-23 | Kopolimery blokowe, mieszanki polimerowe kopolimerów blokowych, sposób wytwarzania kopolimerów blokowych oraz zastosowanie kopolimerów blokowych i mieszanek polimerowych |
AU34313/00A AU3431300A (en) | 1999-03-27 | 2000-03-23 | Transparent, impact-resistant polystyrene on a styrene-butadiene block copolymerbasis |
EP00912636A EP1171497B1 (de) | 1999-03-27 | 2000-03-23 | Glasklares, schlagzähes polystyrol auf basis von styrol-butadien-blockcopolymeren |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914075A DE19914075A1 (de) | 1999-03-27 | 1999-03-27 | Glasklares, schlagzähes Polystyrol auf Basis von Styrol-Butadien-Blockcopolymeren |
DE19914075.8 | 1999-03-27 | ||
US09/471,288 US6521712B1 (en) | 1999-03-27 | 1999-12-23 | Glass-clear impact-modified polystyrene based on styrene-butadiene block copolymers |
US09/471,288 | 1999-12-23 |
Publications (1)
Publication Number | Publication Date |
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WO2000058380A1 true WO2000058380A1 (de) | 2000-10-05 |
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Application Number | Title | Priority Date | Filing Date |
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PCT/EP2000/002568 WO2000058380A1 (de) | 1999-03-27 | 2000-03-23 | Glasklares, schlagzähes polystyrol auf basis von styrol-butadien-blockcopolymeren |
Country Status (18)
Country | Link |
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US (1) | US6521712B1 (de) |
EP (2) | EP1690879B1 (de) |
JP (2) | JP3976505B2 (de) |
KR (1) | KR100602971B1 (de) |
CN (1) | CN1142957C (de) |
AT (2) | ATE342293T1 (de) |
AU (1) | AU3431300A (de) |
BR (1) | BR0009361B1 (de) |
CA (1) | CA2368312C (de) |
CZ (1) | CZ300163B6 (de) |
DE (3) | DE19914075A1 (de) |
ES (2) | ES2274780T3 (de) |
HU (1) | HUP0201377A3 (de) |
MX (1) | MX222345B (de) |
PL (1) | PL197792B1 (de) |
RU (1) | RU2256670C2 (de) |
UA (1) | UA72512C2 (de) |
WO (1) | WO2000058380A1 (de) |
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