WO1997040079A1 - Thermoplastische formmasse - Google Patents
Thermoplastische formmasse Download PDFInfo
- Publication number
- WO1997040079A1 WO1997040079A1 PCT/EP1997/001670 EP9701670W WO9740079A1 WO 1997040079 A1 WO1997040079 A1 WO 1997040079A1 EP 9701670 W EP9701670 W EP 9701670W WO 9740079 A1 WO9740079 A1 WO 9740079A1
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- WO
- WIPO (PCT)
- Prior art keywords
- block
- block copolymer
- copolymer according
- diene
- potassium
- Prior art date
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Classifications
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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
- 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
Definitions
- Block copolymers of vinyl aromatics (e.g. styrene) and dienes (e.g. butadiene) are copolymers from several strung together or otherwise linked polymer molecule areas (so-called blocks), which are more or less uniformly constructed.
- blocks polymer molecule areas
- diene monomers - at a certain temperature - they can be altogether elastomeric, i.e. have rubber-elastic properties or stiff, non-rubber-elastic properties, i.e. to the outside, they behave either rubber-elastic, similar to a polydiene, and have e.g. as a so-called SB rubber meaning, or like transparent, impact-resistant styrene polymers.
- SB rubber like ordinary diene polymers, must be vulcanized for use, which severely limits their use and makes processing more expensive.
- the invention normally relates to transparent, purely thermoplastically processable block copolymers of vinyl aromatics and dienes with elastomeric behavior and special mechanical and improved thermal properties.
- Block copolymers are obtained by polymerizing in each case to approximately the exhaustion of a monomer supply and then changing the monomer or monomers. This process can be repeated several times.
- Linear block copolymers are described, for example, in U.S. Patents 3,507,934 and 4,122,134.
- Star-shaped block copolymers are known, for example, from US Pat. Nos. 4,086,298; 4,167,545 and 3,639,517.
- the property profile of these block copolymers is essentially determined by the content of polymerized diene monomers, i.e. Length, arrangement and ratio of quantities characterized by polydiene and polystyrene blocks.
- the type of transition between different blocks plays an important role. The influence of sharp and so-called tapered transitions (depending on whether the monomer change takes place abruptly or gradually) is discussed in detail in DE-Al-44 20 952, so that there is no need to repeat this here.
- materials with a diene content of over 35% by weight which due to their property profile (toughness, transparency, gas permeability) would be suitable for medical applications such as infusion hoses, infusion drip chambers and stretch films, are very difficult to achieve by profile extrusion, injection molding or tubular film extrusion to process;
- stabilization with antioxidants and radical scavengers they are thermally very sensitive and tend to be sticky, so that additives have to be used with great effort.
- the so-called blocking (gluing of films and tubes on the roll) and poor demouldability can make processing by injection molding completely impossible.
- DE-Al-44 20 952 has proposed producing a rubber-elastic block copolymer which consists of at least one polymerized unit of a vinyl aromatic monomer having a hard phase-forming block A and / or a diene monomer having a first rubber-elastic (soft) phase forming block B and at least one polymerized units of a vinyl aromatic monomer and a diene-containing elastomer, an - optionally further - soft phase forming block (B / A), the
- Glass temperature T g of block A above 250C and that of block (B / A) below 250C and the phase volume ratio of block A to Block (B / A) is selected so that the proportion of the hard phase in the total block copolymer is 1-40 vol.% And the proportion by weight of the diene is less than 50 wt.%.
- the object of the invention is to achieve, by suitable choice of the molecular structure, elastomeric, ie rubber-elastically acting block copolymers which are easy to manufacture on a large scale, have a maximum of toughness with a low diene content and, like thermoplastics, on extruders and injection molding machines are easy to process and in particular without annoying speck formation.
- this is expressed, in general terms, in that in a vinylaromatic-diene block copolymer consisting of blocks which form a hard phase (block type A) and those which form a soft phase, instead of a pure polydiene block (block type B) Soft phase lets a block (B / A) of diene and vinylaromatic units occur, which has a strict statistical structure, the relative proportion of 1,2-linkages of the polydiene, based on the sum of 1,2- and 1,4 cis / trans linkages in any case is below about 12 to 15%.
- the statistical average along the chain can be homogeneous or inhomogeneous.
- a rubber-elastic block copolymer composed of at least one polymerized unit of a vinyl aromatic monomer having a hard phase forming block A and at least one polymerized unit of a vinyl aromatic monomer and a diene containing elastomer forming a soft phase block (B / A), wherein the glass transition temperature T g of block A is above 250C and that of block (B / A) is below 250C and the phase volume ratio of block A to block (B / A) is selected such that the proportion of the hard phase in the entire block copolymer 1 to 40 vol .-% and the 97/40079 PC17EP97 / 01670
- the proportion by weight of the diene is less than 50% by weight, the relative proportion of 1,2-linkages of the polydiene, based on the sum of 1,2- and 1,4-cis / trans-linkages, being below about 12 to 15 % lies.
- the vinyl aromatic monomer is preferably selected from styrene, ⁇ -methylstyrene, vinyl toluene and 1, 1-diphenylethylene and the diene from butadiene and isoprene.
- Such a rubber-elastic block copolymer according to the invention having a reduced tendency to crosslink is obtained by forming the soft phase from a statistical copolymer of a vinylaromatic with a diene within the scope of the above parameters; statistical copolymers of vinyl aromatics and dienes are obtained by polymerization in the presence of a potassium salt which is soluble in nonpolar solvents.
- the statistical copolymerization of styrene and butadiene in cyclohexane in the presence of soluble potassium salts is described by S.D. Smith, A. Ashraf and co-workers in Polymer Preprints 34 (2), 672 (1993) and 35 (2). 466 (1994).
- soluble potassium salts As soluble potassium salts
- the molar ratio of lithium to potassium in this case is approximately 10: 1 to 40: 1. If a composition gradient is desired along the statistical block (i.e. a composition that changes more or less smoothly from butadiene to styrene in the context of the invention), Li / K ratios greater than 40 to 1 should be selected; with a gradient of styrene to butadiene ratios less than 10: 1.
- a block copolymer according to the invention can be represented, for example, by one of the general formulas 1 to 11: (1) (A- (B / A)) n ;
- A stands for the vinylaromatic block and (B / A) for the soft phase, that is to say the block constructed statistically from diene and vinylaromatic units
- X the rest of an n-functional initiator
- Y the rest of an m-functional coupling agent
- m and n are natural numbers from 1 to 10.
- each sub-block being constructed differently or their vinylaromatic / diene ratio in the individual blocks (B / A) changing such that in each section (sub-block) a composition gradient (B / A) p ⁇ ⁇ (B / A) p2 ⁇ (B / A) p3 occurs, the glass transition temperature T g of each sub-block being below 25 ° C.
- Such block copolymers which have, for example, p_ repeating sections (partial blocks) with changing monomer structure within a block (B / A), can be formed by adding the monomers in portions, p_ being an integer between 2 and 10 (cf. also the examples below). The addition in portions can serve, for example, to control the heat balance in the reaction mixture.
- a block copolymer which has a plurality of blocks (B / A) and / or A, each with a different molecular weight per molecule, is also preferred.
- a block B can take the place of a block A composed exclusively of vinylaromatic units, since the only thing that matters is that a rubber- elastic block copolymer is formed.
- Such copolymers can have, for example, the structure (15) to (18)
- Block copolymers according to the invention are outstandingly suitable for the production of rubber-elastic molded parts by the usual methods of thermoplastic processing, e.g. as film, foam, thermoforming, injection molding or profile extrudate.
- Preferred vinyl aromatic compound for the purposes of the invention is styrene and also ⁇ -methylstyrene and vinyltoluene and
- Preferred dienes are butadiene and isoprene, also piperylene, 1-phenylbutadiene and mixtures of these compounds.
- a particularly preferred monomer combination is butadiene and styrene. All of the weight and volume information below relates to this combination; when using the technical equivalents of styrene and butadiene, it may be necessary to convert the information accordingly.
- the (B / A) block is e.g. made up of 75-40% by weight styrene and 25-60% by weight butadiene.
- a soft block particularly preferably has a butadiene content between 35 and 70% and a styrene content between 65 and 30%.
- the proportion by weight of diene in the entire block copolymer is 15-65% by weight in the case of the styrene / butadiene monomer combination, and correspondingly that of the vinylaromatic component is 85-35% by weight.
- Butadiene-styrene block copolymers with a monomer composition of 25-60% by weight of diene and 75-40% by weight of vinyl aromatic compound are particularly preferred.
- the block polymers are produced by anionic polymerization in a non-polar solvent, the initiation being carried out using organometallic compounds.
- organometallic compounds Compounds of alkali metals, especially lithium, are preferred.
- initiators are methyl lithium, ethyl lithium, propyllithium, n-butyllithium, sec. Butyllithium and tert. Butyllithium.
- the organometallic compound is added as a solution in a chemically different (inert) hydrocarbon. The dosage depends on the desired molecular weight of the polymer, but is generally in the range from 0.002 to 5 mol%, if you refer to the monomers.
- Aliphatic hydrocarbons such as cyclohexane or methylcyclohexane are preferably used as solvents.
- the statistical blocks of the block copolymers which simultaneously contain vinyl aromatic and diene are prepared with the addition of a soluble potassium salt, in particular a potassium alcoholate.
- a soluble potassium salt in particular a potassium alcoholate.
- the potassium salt enters into a metal exchange with the lithium carbanion ion pair, potassium carbanions forming which preferentially attach styrene, while lithium cabanions preferably add butadiene.
- potassium carbanions are much more reactive, a small fraction, namely 1/10 to 1/40, is enough to make the incorporation of styrene and butadiene equally likely on average, together with the predominant lithium carbanions.
- potassium salts are potassium alcoholates, in particular tertiary alcoholates with at least 7 carbon atoms. Typical corresponding alcohols are e.g. 3-ethyl-3-pentanol and 2, 3-dimethyl-3-pentanol. Tetrahydrolinalool (3,7-dimethyl-3-octanol) has proven to be particularly suitable.
- potassium alcoholates In addition to the potassium alcoholates, other potassium salts which are inert towards metal alkyls are also suitable in principle. These include dialkyl potassium amides, alkylated diaryl potassium amides, alkyl thiolates and alkylated aryl thiolates.
- the point in time at which the potassium salt is added to the reaction medium is important. Usually at least parts of the solvent and the monomer for the first block are placed in the reaction vessel. It is not advisable to add the potassium salt at this time, since it is at least partially hydrolyzed to KOH and alcohol by traces of protic impurities. The potassium ions are then irreversibly deactivated for the polymerization. Therefore, the lithium organyl should first be added and mixed in, only then the potassium salt. If the first block is a homopolymer, it is advisable to add the potassium salt only shortly before the statistical block is polymerized.
- the potassium alcoholate can easily be prepared from the corresponding alcohol by stirring a cyclohexane solution in the presence of excess potassium-sodium alloy. After 24 hours at 25 ° C the evolution of hydrogen and thus the reaction is complete. The reaction can also be shortened to a few hours by refluxing at 80 ° C.
- An alternative implementation is to add a small excess of potassium methylate, potassium ethylate or potassium tert-butylate in the presence of a high-boiling inert solvent such as decalin or ethylbenzene, to distill off the low-boiling alcohol, here methanol, ethanol or tertiary butanol, the back ⁇ Stand to be diluted with cyclohexane and filtered off from excess poorly soluble alcoholate.
- a high-boiling inert solvent such as decalin or ethylbenzene
- the proportion of 1,2-linkages in relation to the sum of 1,2- and 1,4-linkages of the diene is generally achieved by adding the potassium compound. between 11 and 9%.
- the proportion of 1,2 or 1,4 linkages of the diene units when using a Lewis base according to DE-Al-44 20 952 e.g. a value of 15-40% for the 1,2- and 85-60% for the 1,4-linkages, in each case based on the total amount of diene units polymerized.
- the polymerization temperature can be between 0 and 130 ° C.
- the temperature range between 30 and 100 ° C. is preferred.
- the volume fraction of the soft phase in the solid is of decisive importance for the mechanical properties.
- the volume fraction of the soft phase built up from diene and vinyl aromatic sequences is 60-95, preferably 70-90 and particularly preferably 80-90% by volume.
- the blocks A formed from the vinyl aromatic monomers form the hard phase, the volume fraction of which corresponds to 5-40, preferably 10-30 and particularly preferably 10-20% by volume.
- the volume fraction of the two phases can be measured by means of contrasted electron microscopy or solid-state NMR spectroscopy.
- the proportion of the vinyl aromatic blocks can be determined by osmium breakdown of the polydiene fraction by precipitation and weighing.
- the future phase ratio of a polymer can also be determined calculate the amount of monomer used if the polymerisation is carried out completely every time.
- the block copolymer is clearly defined by the quotient of the volume fraction in percent of the soft phase formed from the (B / A) blocks and the fraction of diene units in the soft phase, which for the combination styrene / butadiene between 25 and 70% by weight.
- T g glass transition temperature
- a glass transition temperature between -50 and + 25 ° C, preferably -50 to + 5 ° C is typical.
- the glass transition temperature is on average 2-5 ° lower than with the corresponding Lewis base-catalyzed products, because the latter have an increased proportion of 1,2-butadiene linkages.
- 1,2-polybutadiene has a glass transition temperature 70-90 ° higher than 1,4-polybutadiene.
- the molecular weight of block A is generally between 1000 and 200,000, preferably between 3,000 and 80,000 [g / mol].
- a blocks can have different molecular weights within one molecule.
- the molecular weight of the block (B / A) is usually between 2,000 and 250,000 [g / mol], values between 5,000 and 150,000 [g / mol] are preferred.
- a block (B / A), like a block A, can have different molecular weight values within a molecule.
- the coupling center X is formed by the reaction of the living anion chain ends with an at least bifunctional coupling (coupling) agent.
- an at least bifunctional coupling (coupling) agent examples of such compounds are found in U.S. Patents 3,985,830, 3,280,084, 3,637,554 and 4,091,053.
- epoxidized glycerides such as epoxidized linseed oil or soybean oil are used; Divinylbenzene is also suitable.
- Dichlorodialkylsilanes, dialdehydes such as terephthalaldehyde and esters such as ethyl formate or ethyl benzoate are particularly suitable for dimerization.
- Preferred polymer structures are A- (B / A) -A; X- [- (B / A) -A] 2 and Y- [- (B / A) -A] 2 , whereby the statistical block (B / A) itself again in blocks (Bi / Ai) - (B 2 / A 2 ) - (B 3 / A 3 ) -... can be divided.
- the statistical block preferably consists of 2 to 15 statistical partial block, particularly preferably from 3 to 10 sub-blocks.
- the division of the statistical block (B / A) into as many sub-blocks Bn / An as possible offers the decisive advantage that even with a continuously changing composition (a gradient) within a sub-block B n / A n as he it is difficult to avoid in anionic polymerization under practical conditions (see below), the (B / A) block as a whole behaves like an almost perfect statistical polymer. It is therefore advisable to add less than the theoretical amount of potassium alcoholate. A larger or a smaller proportion of the sub-blocks can be equipped with a high proportion of diene. This has the effect that the polymer retains a residual toughness even below the glass transition temperature of the predominant (B / A) blocks and does not become completely brittle.
- the block copolymers according to the invention have a spectrum of properties which is very similar to that of plasticized PVC, but can be produced completely free of migratable, low molecular weight plasticizers. They are stable against crosslinking under the usual processing conditions (180 to 220 ° C). The excellent stability of the polymers according to the invention against crosslinking can be clearly demonstrated by means of rheography.
- the experimental arrangement corresponds to that of the MVR measurement. With a constant melt flow rate, the pressure increase as a function of time is recorded. The polymers of the invention show even after 20 min. no increase in pressure at 250 ° C. and result in a smooth strand of melt, while in a comparison sample produced according to DE-Al-44 20 952 with THF, the pressure triples under the same conditions and the strand assumes a barbed wire-like appearance typical of crosslinking.
- the block copolymers according to the invention are furthermore distinguished by a high oxygen permeation P 0 and water vapor permeation P w of over 2,000 [cm 3 -100 mm / m. 2 -d-bar] or more than 10 [g 100 mm / m 2 -d-bar], where Po indicates the amount of oxygen in cm 3 or P w the amount of hydrogen in grams, which is indicated by 1 m 2 of film a standard thickness of 100 mm per day and per bar partial pressure difference.
- thermoplastic elastomers high transparency (over 90% with a layer thickness of 10 mm), a low welding temperature of below 120 ° C and a wide welding range (over 5 °) with a moderate one stickiness make the block copolymers of this invention to a suitable starting material for the herstel ⁇ development of so-called stretch or stretch film, Infusionsschläu ⁇ Chen and other extruded, injection molded, thermoformed or blow-molded finished parts, for which high transparency and toughness are required, especially for applications in the field of medical technology.
- the polymerization is carried out in several stages and in the case of monofunctional initiation e.g. started manufacturing hard block A. Some of the monomers are placed in the reactor and the polymerization is started by adding the initiator. In order to achieve a defined chain structure that can be calculated from the monomer and initiator metering, it is advisable to carry out the process up to a high conversion (over 99%) before the second monomer is added. However, this is not absolutely necessary.
- the sequence of the monomer addition depends on the selected block structure.
- monofunctional initiation e.g. the vinyl aromatic compound is either initially charged or metered in directly.
- a cyclohexane solution of the potassium alcoholate is then added.
- diene and vinyl aromatic should be added at the same time as possible.
- the addition can be done in several portions, e.g. Heat dissipation and comparatively through composition.
- the statistical structure and the composition of the block (B / A) are determined by the quantitative ratio of diene to vinylaromatic compound, the concentration of the potassium salt and the temperature. According to the invention, the diene takes up a proportion by weight of 25% to 70% relative to the total mass, including vinylaromatic compound.
- Block A can then be polymerized by adding the vinylaromatic. Instead, the required polymer blocks can also be connected to one another by the coupling reaction. In the case of bifunctional initiation, the (B / A) block is built up first, followed by the A block.
- a 50 liter stainless steel autoclave that could be heated and cooled simultaneously and was equipped with a cross-bar stirrer was used by flushing with nitrogen, boiling with a solution of sec-butyllithium and 1,1-diphenylethylene in a molar ratio of 1: 1 prepared in cyclohexane and drying.
- the temperature of the reaction mixture was controlled by heating or cooling the reactor jacket. After the end of the reaction (consumption of the monomers) was titrated in Examples 1-7 and the comparative experiment with ethanol, in Example 8 with ethyl formate and in Example 9 with epoxidized linseed oil to colorlessness or in Examples 11 and 12 until light yellow and the Mixture with a 1.5-fold excess of formic acid made acidic. Finally, 34 g of a commercially available stabilizer ( ® Irganox 3052; Ciba-Geigy / Basel) and 82 g of trisnonylphenyl phosphite were added.
- a commercially available stabilizer ® Irganox 3052; Ciba-Geigy / Basel
- 82 g of trisnonylphenyl phosphite were added.
- the solution was worked up on a degassing extruder (three domes, forward and backward degassing) at 200 ° C. and granulated.
- the granules were mixed with 10 g ® Acrawax as external lubrication in a fluid mixer.
- the rheographic measurements were carried out on an MFI device from Göttfert. At constant flow, the pressure rise was followed, which is a measure of the increasing crosslinking of the sample at the selected temperature. Since the materials are especially suitable for thin films, the gel content is extremely low, i.e. low tendency to crosslink at a processing temperature of e.g. 200 to 220 ° C essential.
Abstract
Description
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Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/981,051 US6197889B1 (en) | 1996-04-19 | 1997-04-03 | Thermoplastic elastomeric block copolymers |
JP53765497A JP3953522B2 (ja) | 1996-04-19 | 1997-04-03 | 熱可塑性成形材料 |
CA002221460A CA2221460C (en) | 1996-04-19 | 1997-04-03 | Thermoplastic molding material |
EP97919315A EP0859803B1 (de) | 1996-04-19 | 1997-04-03 | Thermoplastische formmasse |
DE59700794T DE59700794D1 (de) | 1996-04-19 | 1997-04-03 | Thermoplastische formmasse |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19615533A DE19615533A1 (de) | 1996-04-19 | 1996-04-19 | Thermoplastische Formmasse |
DE19615533.9 | 1996-04-19 |
Publications (1)
Publication Number | Publication Date |
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WO1997040079A1 true WO1997040079A1 (de) | 1997-10-30 |
Family
ID=7791776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/001670 WO1997040079A1 (de) | 1996-04-19 | 1997-04-03 | Thermoplastische formmasse |
Country Status (9)
Country | Link |
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US (1) | US6197889B1 (de) |
EP (1) | EP0859803B1 (de) |
JP (1) | JP3953522B2 (de) |
KR (1) | KR100453662B1 (de) |
CN (1) | CN1143871C (de) |
CA (1) | CA2221460C (de) |
DE (2) | DE19615533A1 (de) |
ES (1) | ES2140974T3 (de) |
WO (1) | WO1997040079A1 (de) |
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WO2006053663A1 (de) | 2004-11-17 | 2006-05-26 | Basf Aktiengesellschaft | Masterbatch auf basis von styrol-butadien-blockcopolymeren |
US8568633B2 (en) | 2007-04-11 | 2013-10-29 | Basf Se | Elastic particle foam based on polyolefin/styrene polymer mixtures |
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Also Published As
Publication number | Publication date |
---|---|
CN1189170A (zh) | 1998-07-29 |
KR100453662B1 (ko) | 2005-02-24 |
CN1143871C (zh) | 2004-03-31 |
KR19990023020A (ko) | 1999-03-25 |
JP3953522B2 (ja) | 2007-08-08 |
DE59700794D1 (de) | 2000-01-05 |
ES2140974T3 (es) | 2000-03-01 |
JPH11508317A (ja) | 1999-07-21 |
DE19615533A1 (de) | 1997-10-23 |
EP0859803A1 (de) | 1998-08-26 |
CA2221460C (en) | 2006-07-11 |
EP0859803B1 (de) | 1999-12-01 |
CA2221460A1 (en) | 1997-10-30 |
US6197889B1 (en) | 2001-03-06 |
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