KR900002532B1 - Polyblend of styrene/alpha-methyl styrene copolymers with interpolymerized styrene-grafted rubber concentrates - Google Patents

Abstract

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Description

Polyblends of Aromatic / isopropenyl Aromatic Copolymers and Grafted Rubber Concentrates

The present invention relates to an improved polyblend, which is a mixture of styrene and α-methylstyrene and a mixture of polystyrene and grafted interpolymer materials in the elastic polybutadiene period or main chain.

Various homopolymers and copolymers of α-methylstyrene, including styrene / α-methylstyrene copolymers, and methods of preparing α-methylstyrene-containing grafts and block interpolymers on various elastomers or rubber periods [Reference: United States Patent Nos. 2,658,058, 3,036,053, 3,069,405, 3,367,995, 3,463,833, 3,825,623, 3,952,512, 3,956,426, 4,075,253, 4,327,4,097,5 And 4,294,946; And British Patent 1,264,741.

The theory and embodiments of polymer compatibility and mixing are described in the literature. Paul and Seymour Newman in Polymer Blends, Vols, 1 and 2, Academic Press 1978].

A number of rubber-reinforced plastic products, including polyblends, have been provided and are somewhat known, including interpolymers of α-methylstyrene. Many of these features are described in the following references: Costas H, published as part of the Plastics Application Series by Rheinhold Publishing Corporation, New York City. ABS plastics by Costas H. Baskekis; Toughened plastics (1977) by C.B.Bucknell, published by Applied Science Publishers Ltd., London; And United States Patent No. 4,371,633 to Russell.

Many synthetic resin-based thermoplastic polymeric materials and / or polyblends of the prior art have acceptable tensile strength, impact resistance and thermal strain. However, they include polyblends of rubber-modifiers, which are different from various styrene polymers, in particular, where other important properties such as thermal stability, hardness and environmental stress crack resistance are desirable when plastics are made from conventional interpolymer materials of styrene. It was found to be less than.

Homogeneous mixtures with α-methylstyrene or isopropenyl aromatic copolymers that exhibit not only satisfactory tensile strength, impact resistance and high thermal strain resistance, but also resistance to excellent thermal stability, excellent hardness and good degree of environmental stress crack resistance It would be very desirable if it could provide a polyblend of the rubber graft copolymer present.

The above and other advantages of the present invention will be understood by considering the following description.

The present invention relates to (a) (a ') at least one isopropenyl aromatic monomer of general formula (I) of 10 to 70 mol% (based on the total weight of the copolymer) and (a ") at least one of general formula (II) 40 to 95 weight percent copolymer with vinyl aromatic monomer (based on the total weight of the polyblend), and (B) the (b ') graft-copolymer, formed over the term or backbone core region and the outer shell portion of the core / shell structure 10 to 75% by weight (based on the total weight of component (B)) of the at least one monomer of general formula (III) and (b ") grafted rubber concentrate of component (B), grafted at Graft in a state of grafted rubber concentrate, dispersed in component (A) in the form of particles having a core / cell structure, consisting of 90 to 25% by weight of graft elastomeric rubber (based on the total weight of component (B)) 5 to 60 weight percent of the copolymer (based on the total weight of the polyblend) Water formed, to a polyblend having a toughness impact resistance and heat deformation resistance.

Wherein Ar is an aromatic radical and G is hydrogen or methyl.

Polyblends according to the invention contain component (A) 40 to 95% by weight (based on the total weight of the polyblend). The polyblends of the invention advantageously contain component (A) in an amount of 60 to 90% by weight, more preferably 60% by weight.

The isopropenyl aromatic monomers which can be used in the preparation of the copolymer component (A) in the polyblends of the invention are compounds of the general formula (I):

Wherein Ar is an aromatic radical having 6 to 10 carbon atoms (including various alkyl- and halo-ring-substituted aromatic units).

Preferred monomers of the general formula (I) are α-methylstyrene, and specific kinds such as isopropenyl toluene and isopropenyl naphthalene can be used. Mixtures of monomers of general formula (I) can be used.

Styrene is usually preferred as the vinyl aromatic monomer of formula (II) used to copolymerize with the monomer of formula (I) to prepare component (A). Monomer materials (including styrene) which can be used in various mixtures with other compounds are compounds of the general formula (II)

CH ₂ = CH-Ar (II)

Wherein Ar is an aromatic radical as defined above. As a kind of monomer of general formula (II) which can be used besides styrene, Vinyltoluene; Vinyl naphthalene and dimethyl styrene; Tertiary butyl styrene; Some chlorostyrenes such as mono- and dichlor-modifiers; And some bromostyrenes (eg, mono- and dibromo-modifications).

Typically, component (A) is a copolymer of 10 to 70 mole percent of one or more monomer (s) of formula (I) and 90 to 30 mole percent of monomer (s) of formula (II). The copolymer of formula (I) / formula (II) used as component (A) constituting the polyblend of the present invention contains the monomer of copolymerized formula (I) in an amount of 20 to 70% by weight. It is preferable. It is mainly preferred that the proportion of the monomer of copolymerized general formula (I) is 50 to 70% by weight. In particular, when α-methylstyrene is included in the copolymer, and thus the copolymer mainly consists of copolymerized α-methylstyrene and styrene, the proportion of monomers of the general formula (I) in the copolymer used as component (A) is As it increases, the thermal deformation properties actually improve.

When the weight average molecular weight (Mw) of the copolymer of general formula (I) / general formula (II) is 50,000-500,000, and molecular weight distribution is 1-3, it shows favorable performance. If the Mw of the copolymer of component (A) is in the range of 100,000 to 200,000 and the Mw distribution is 1 to 2.5, the most advantageous effect is obtained.

The graft-interpolymerized grafted rubber concentrate in the form of "shell / core" used as component (B) in the polyblends of the invention preferably has a core portion of an elastomer that is typically solid. Elastomeric materials obtainable in emulsion or latex form are suitable for use in the present invention. Such elastomeric materials can be prepared by free radical polymerization in emulsions; After dissolving the elastomer in a solvent, the solution can be prepared by mechanical emulsification, flocculation and grafting as described for component (B). Such elastomers include butadiene polymers, isoprene polymers, acrylate polymers, and copolymers of dienes and ethylene / propylene. Such elastomers include copolymers and terpolymers using materials such as styrene and acrylonitrile. Other examples of rubbers and elastomers are described in US Pat. No. 4,371,663. The patent specifically describes the case where the synthetic rubber included is a polymer or copolymer (but not polybutadiene) of butadiene-1,3 and / or isoprene and / or 2,3-dimethylbutadiene-1,3-.

The polyblends of the invention typically comprise component (B) in an amount of 5 to 60% by weight, more preferably 40% by weight (based on the total weight of the polyblend). The shell portion in the grafted rubber concentrate contained in component (B) is preferably interpolymer and polystyrene grafted on the elastomeric core of the period or main chain. The shell portion b 'in the grafted rubber concentrate typically constitutes 10 to 75% by weight of the grafted rubber concentrate. It is more advantageous if the shell portion in the grafted rubber concentrate constitutes 20-30% by weight of the graft-interpolymerized component; It is most advantageous if the shell constitutes 25% by weight (within ± 3% by weight) of the grafted rubber concentrate.

In the preparation of the grafted rubber concentrate, about one half of the monomers of the general formula (III) to be polymerized form grafts, and almost the same amounts form homopolymers.

The styrene interpolymer corresponding to the shell portion of the grafted rubber concentrate includes a polymer that may include styrene, or a mixture of monomers of the general formula (III):

Wherein G is hydrogen or methyl and Ar is as defined above. In addition to styrene, monomers of general formula (III) which can be used include those specifically described with reference to the compounds of general formulas (I) and (II) above. If no particular graft-interpolymerization technique is used, no isopropenyl aromatic monomer is used or only a small amount of the monomer of formula (III) for grafting to the shell site on the elastomeric core of the period. It is usually important.

Given the suitable particle size of the grafted rubber concentrate used as component (B) in the polyblends of the present invention, each particle size, whether monodisperse or polydisperse, is 0.05 to 3 microns, more preferably 0.3 to A relatively large one, such as the 2 μ range, is usually preferred.

When a latex of a polymer of 10% by weight acrylic acid and 90% by weight ethyl acrylate is used as the flocculant, an amount of 0.4 parts by weight or less based on the solids of the material per 100 parts of the elastomer to be aggregated is usually used. . Shell / core flocculants have been found to have better properties than acrylic acid acrylate mixtures. The cell / core flocculant contains a shell of about 8% by weight of methacrylic acid and 92% by weight of ethyl acrylate, and about 2 parts of flocculant are used to agglomerate 100 parts of the elastomer. In both cases, 30 to 50% by weight of the initial elastomer having a particle diameter of 0,1 micron is aggregated to a size of 0.3 to 2.5 micron.

Isopropenyl aromatic monomers of general formula (I), in particular α-methylstyrene, whether in whole or in part, are difficult to polymerize by thermal or free-radical-catalyzed-initiated polymerization or by solution or suspension polymerization, sometimes impossible. In addition, the above difficulties are encountered when preparing random copolymers and / or graft copolymers of isopropenyl aromatic monomers with other mono- or ethylenically unsaturated monomers using conventional polymerization techniques, and with thermal or free-radical mechanisms. It is also experienced when preparing a polymer which can be easily polymerized by the conventional method.

The copolymers and graft copolymers of component (A) using α-methylstyrene and / or other monomers of general formula (I) are secondary butyllithium and n-butyl as in US Pat. Nos. 3,322,734 and 3,404,134 It can be easily prepared by an anionic solution polymerization method using an organometallic initiator such as lithium. Excellent methods for copolymerizing and interpolymerizing isopropenyl aromatic monomers are described in EPO Publication No. 135,168.

To prepare the polyblends of the invention, components (A) and (B) are physically mixed in the desired proportions to obtain a mixture that looks homogeneous by visual observation. Appropriate plastic mixing devices can be used. It can be mixed batchwise using a device such as Brabender " PLASTICORDER " and can be mixed continuously using conventional extruders, including double screw extruders. In many cases, component (A) is suitable for thermoplasticizing the mixed components but at temperatures lower than the temperature which significantly degrades the polymers thereof, on a powerful mixing apparatus (eg extruders, mixing rolls and Banbury mixers) or in the apparatus. And (B) to melt blend these components until a mechanical mixture is made to produce a polyblend. If the polymer is a latex type frame, the latex can be mixed, the mixture can be solidified and dried to recover the polymer.

The polyblends of the present invention may contain other additives often used in plastic compositions, such as antioxidants, pigments, dyes, fillers, stabilizers, mineral oils and other plasticizers, lubricants, and blowing agents.

The polyblends of the present invention have very good toughness and high heat deflection. As shown in Table 1, typical polyblends according to the present invention surprisingly exhibit good thermal strain values while still maintaining high tensile strength and acceptable impact resistance. Tensile strength is given in mega pascals (MPa) and pounds per square inch (psi). Izod impact strength is given in joules per meter of notch (J / m) and foot pounds per inch of notch (ft-1b / in.). Thermal strain values are given in degrees Celsius (° C.) and degrees Fahrenheit (° F.). Glossiness is given in percent.

TABLE 1

Comparison of Physical Properties of Some Styrene Plastics

Comparative Examples, Not Examples of the Invention

1 A conventional rubber-modified high impact polystyrene plastic composition made from about 5 weight percent polybutadiene.

2 A typical ABS product of polymerized acrylonitrile / butadiene / styrene having a soluble fraction containing about 13.5% by weight of rubber and containing about 23.5% by weight of acrylonitrile, which is almost identical to commercially available ABS resins. Have the same characteristics.

Graft rubber concentrate in the form of “shell / core” containing about 49% by weight of styrene shell polymerized on 3 polybutadiene cores and about 50% by weight of polystyrene for conventional purpose, which is in Example 3 below Same as the grafted rubber concentrate to be prepared.

4 Styrene / acrylonitrile copolymer containing about 50% by weight of styrene / acrylonitrile copolymer containing 29.7% by weight of copolymerized acrylonitrile and about 50% by weight of polybutadiene. A polyblend having a grafted rubber concentrate having a particle size in a range of about 0.1 to 1 mu.

5 about 50% by weight of α-methylstyrene / styrene comonomer containing each comonomer copolymerized in itself in an amount of about 50% by weight and the same grafted rubber concentrate as used in product (C) Blended polyblend.

The polyblend of the present invention is useful for thermoforming processing (by injection and compression molding, extrusion, thermoforming, etc.) as a product that withstands high temperatures at high temperatures. Such articles include hot-filled containers, plates, cups, regenerated containers for microwave heating and / or cooking; Electronic parts ; Television cabinet; Automotive parts and articles similar to those above where high temperature performance is desired are included. Molded articles made from the polyblends of the present invention can be made with an attractively smooth and shiny surface that is easily washed by conventional cleaning methods. In addition, they can be easily painted and welded.

The following examples provide a variant advantage for practicing the present invention. All parts and percentages are given by weight and all temperatures are degrees Celsius (° C.) unless otherwise noted.

Method of Preparation of Grafted Rubber Concentrate

Conventional techniques of US Pat. No. 4,419,496 (Henton and O'Brien) are used.

Grafted rubber concentrates in the form of "shell / core" of comonomers grafted with polystyrene shell sites on polybutadiene cores are prepared in the following manner. Small amounts of monomeric materials other than styrene and butadiene are used. Such materials are used to prepare flocculants that are used to produce relatively largely sized particles of largely uniformly dispersed polybutadiene core backbone. When applying Henton and O'Brien techniques to produce grafted rubber concentrates, the following steps are included: (iii) preparation of polybutadiene latex rubber; (Ii) partial rubber agglomeration; And (iii) grafting of the rubber. Coagulants are prepared separately for use in step (ii).

The flocculant is prepared in a glass-built jacket pfaudler kettle for a 0.76 m 3 (200 U.S. gelon) equipped with a stirrer. The following mixture is prepared. The weight of all numbers represents kilograms (kg), and the parentheses mean pounds.

1. Reactor Fill

366 (807) -Deionized Water

0.82 (1.8) -sodium bicarbonate

0.49 (1.08) -sodium persulfate

1.02 (2.25)-"CALSOFT L-40" with 40% activity rating

0.60 (1.32) -acrylic acid

2. Monomer Mixture

245 (540) -ethyl acrylate

27.2 (60) -acrylic acid

3. Aqueous mixture

122 (270) -Deionized Water

A 12.9 (28.4) -dispersed detergent component "CALSOFT L-40" reactor charge (1) is added to the Puddler reactor at 30 ° C. The reactor contents are deoxygenated using nitrogen and vacuum. After the oxygen has been removed, 6.12 kg (13.5 lb) of the mixture (2) is added to the reactor and the contents are heated to 65 ° C. After 15 minutes, the reactor contents reach 65 ° C. and the monomer mixture 2 is added simultaneously and continued for 5 hours at a rate of 53.2 kg (117.3 lbs) per hour. Ten minutes after the addition of the polymer mixture (2), the aqueous mixture (3) is added to the reactor for 5 hours at a rate of 27.1 kg (59.7 pounds) per hour. After all additions, the reaction mixture is held at 65 ° C. for an additional 3 hours. After cooling, the resulting flocculant mixture is filtered for continued use.

For the preparation of grafted rubber concentrates for the preparation of polyblends according to the invention, when used in the following activity (%) or solid concentration (%), most of the preformed mixtures present in the form of aqueous solutions or dispersions The second set is made.

The grafted rubber concentrate is prepared in a glass in-glass jacketed reactor for 13.25 m 3 (3,500 U.S. gelton). The mixture used is as follows and the amounts are in kg and (lbs).

4. Reactor Fill for Graft Copolymer Formulations

2486 (5,480) -Deionized Water

69.0 (152) -34.5% Active Polybutadiene Species Latex

745 (1,663) -0.467% active sodium bicarbonate

59.0 (130) -1.13% solid "VERSENE" chelating agent (cisodium ethylene dinitriol tetraacetate)

5. Rubber Reaction Aqueous Mixture

433 (954) -Deionized Water

142 (314) -43.9% solid "CALSOFT L-40" (sodium alkylarylsulfonate)

6. Flocculant mixture

1690 (3,270) -Deionized Water

22.7 (50) -42.9% "CALSOFT L-40"

94.4 (208)-pre-fabricated flocculant as described above

7. Aqueous mixture for performing graft reaction

1480 (3,260) -Deionized Water

22.7 (50) -42.9% Solid "CALSOFT L-40"

376 (829) -2.46% Active Sodium Persulfate Catalyst

Reactor fill 4 is added to the reactor, deoxygenated by vacuum, and the reactor is heated to 65 ° C. During heating, 33 kg (73 lb) of acrylonitrile is added to the reactor contents in the reactor. After reaching the reactor contents at 65 ° C., 1.8 kg (4 lb) acrylonitrile, 4.1 kg (9 lb) styrene, 78.9 kg (174 lb) butadiene-1,3. Continue filling with 0.32 kg (0.7 lb) of n-dodecyl mercaptan and 138 kg (304.3 lb) of an aqueous solution of 2.46% active sodium persulfate. After filling, the following additives are then added:

After all of the above additives have been added, the temperature of the reactor contents is maintained at 65 ° C. until the pressure in the reactor reaches 1.4 × 10 ⁵ pa · s (20 psig). The reactor is then evacuated and purged with about 101 m (3,600 ft3) of nitrogen.

After clarification, 1950 g of latex is placed in a cylindrical reactor for 4-1. The contents of the reactor are heated to 80 ° C. The contents are stirred with an axial paddle stirrer rotating at about 300 rpm. 130 g of flocculation mixture 6 are added to the reactor at a rate of 4.83 g per minute. 41.6% of the latex particles having an initial average particle size of about 0.1 micron are aggregated into a larger group of particles having an average particle size of about 0.83 micron. After the flocculation mixture was added, the reaction temperature was lowered to 70 ° C. and the following graft copolymerization reaction additive was added to the reactor.

After all of the above additives were added, the graft copolymerization reaction was carried out for 1 hour. The reactor contents are then cooled.

The resulting grafted rubber concentrate is converted from latex to dry powder. The grafted rubber concentrate latex 3.81 (1U.S.gallon) was charged in a steam-depleted unit and the latex was called "DOW CORNING FG-10" at Dow Corning Corporation, 48640, Midland, before the vapors were removed. Many dry samples are prepared by adding about 3 to 5 g of a commercially available silicone antifoaming agent under the trademark. For each 3.8 liter fraction converted, steam is continued to remove until 350 ml of concentrate is collected. Then, in each vapor-depleted sample, 'TOPANOL CA' (registered as TOPANAL CA is 1,1,3-tri (2 'methyl 4' hydroxy-5 'tert-butyl phenyl) butane) 0.6% (Based on rubber content), and 0.2% of dilaurylthiodipropanoate (based on rubber content) The product is then freeze-coagulated, centrifuged and dried at 50 ° C. overnight.

The resulting grafted rubber concentrate of fines is used to prepare the following polyblends.

Example 2

[Manufacturing method of grafted rubber concentrate]

A second grafted rubber concentrate is prepared using the conventional method of Example 1.

The following mixtures are used: Mixture 1.35 parts of polybutadiene latex rubber and 65 parts of deionized water; Mixture 2. Mixture of 1.8 parts of Example 1 (6), flocculant mixture of 0.6 parts of "CALSOFT L-40" and 97.6 parts of deionized water; Mixture 3. Aqueous mixture of 0.4 parts sodium persulfate, 2.2 parts "CALSOFT L-40" and 97.4 parts deionized water; And mixture 4. Monomer mixture of 0.15 parts n-octyl mercaptan and 99.85 parts monomeric styrene.

A stirred jacketed reactor for 381 (10 U.S. gallons) is used. The reactor is charged with 16150 g of mixture 1, first deoxygenated and then heated to 70 ° C. 1,100 g of mixture 2 is then added into the reactor over a period of 28 minutes at a constant rate. Partially coagulate the latex particles with an initial average particle size of about 0.1 micron to form a group of particles having a larger average particle size. 5040 g of mixture 3 and 5880 g of mixture 4 are then charged to the reactor over a period of 7 hours at a temperature of 70 ° C. After the addition, the reaction mixture is kept at 70 ° C. for 1 hour. Prior to vapor-removal of the terminated product, 21 g of "TOPANOL CA" and 7 g of dilaurylthiodipropanoate are added to the resulting latex. The grafted rubber concentrate is then freeze-coagulated, centrifuged and dried as in Example 1.

The grafted rubber concentrate is used in the preparation of the polyblend product of the invention.

Example 3

EXAMPLES Preparation of Composition

50:50 weight ratio copolymer of α-methylstyrene and styrene was prepared as having an Mw of 170,000 by continuous anionic polymerization.

Using the method of Example 2, a grafted rubber concentrate of a large particle group having a butadiene content of 51% and an average particle size of 0.6 mu is prepared.

608 g of the copolymer and 329 g of the grafted rubber mixture are then mixed by passing through a 2 inch (0.8 inch) Welding Engineer double screw extruder. The polyblend is then injection molded to make a specimen and to measure its physical properties.

The results obtained are shown in Table II below.

TABLE 2

Physical Properties of Conventional Polyblends Prepared According to the Invention

Example 4

By repeating the conventional method shown in Example 3, two additional α-methylstyrene / styrene copolymers were prepared, one of which had a Mw distribution of 110,000 and a Mw of 1.5, and the other of 170,000 and It has a Mw distribution of 2.2.

Both copolymers have the same weight ratio in some samples tested to mix with various grafted rubber concentrates (similar to the grafted rubber concentrates of Example 3) containing about 50% of the polystyrene polymerized in its shell. Copolymers and grafted rubber concentrates are present, each of which shows excellent results equivalent to those of Table II when made into a polyblend by the double screw extruder of Example 3.

In order to maximize the percent elongation at break in the polyblends of the invention, it is usually desirable to maximize the styrene polymer content of the shell portion in the grafted rubber concentrate.

Example 5

In order to exhibit the particle size control effect of the grafted rubber concentrate used in the embodiment of the present invention, the method of Example 3 was used except that a grafted rubber concentrate (GRC 2) having a particle size of 1.8 µm or less was used. Repeat. This GRC is compared with the grafted rubber concentrate (GRC 1) of Example 3 which contains some particles whose particle size changes to 1.8 mu or more.

Then, for comparative purposes, the grafted rubber of the homopolymer or copolymer (component A), which is almost identical to that prepared in Example 3, using some general purpose polystyrene in the mixture and other α-methylstyrene / styrene copolymers In a weight ratio to concentrate (component B), samples of polyblends comprising grafted rubber concentrates of only small particle sizes are prepared. A test sample of a second grafted rubber concentrate having a particle size of 1.8 μm or less was prepared using a similar polystyrene homopolymer and α-methylstyrene / styrene comprising the first grafted rubber concentrate used in Example 3 having a particle size of 1.8 μm or more. Compare to copolymer polyblend sample.

The results are shown in Table 3. Polyblends are prepared to contain 20% by weight elastomer.

TABLE 3

If grafted rubber concentrate 2 (instead of smaller rubber particles) is used instead of grafted rubber concentrate 1, the impact resistance is reduced in the mixture comprising general purpose polystyrene, while the styrene / α-methylstyrene mixture Similar substitutions in E significantly increase the impact resistance.

Polyblends prepared from a limited particle sized grafted rubber concentrate having only small particles made of polystyrene homopolymer-based resins of the mixture are prepared according to embodiments of the invention using α-methylstyrene / styrene copolymers. It has poor toughness as shown in the Izod and Gardner Dart tests compared to the one used.

Example 6

Molding the same cup from conventional polybutadiene-rubber-modified high impact polystyrene (the same as that described as test article (a) in Table I above) and the polyblend of the invention similar to that described in Example 3 above do. Both are immersed in boiling water for 15 minutes. High impact polystyrene cups fail the heat treatment test completely and deform poorly. Polyblend cups are not completely affected and their original form is preserved in the same boiling water test treatment.

In addition, the problem of resistance of synthetic resin materials to cooking oil is also very important. In the cooking oil resistance test of the resin, the polymer sample of the present invention is placed under a tensile load of about 5.5 MPa (800 pounds per square inch) while being subjected to simulated cooking oil conditions using a 1: 1 mixture of lactic acid and cottonseed oil. When the resin sample of the present invention is exposed for more than 100,000 minutes, there are no signs of breakage. When similar samples are made using polystyrene rather than α-methylstyrene copolymers, samples made with general purpose polystyrene break between about 2,000 and 4,000 minutes.

Copolymers of α-methylstyrene with styrene are commonly known to have good heat resistance, but the polyblends of the present invention have greater heat deformation properties than would be expected. Grafted rubber concentrates tend to reduce heat resistance by polyblending with the α-methylstyrene / styrene copolymer component.

The heat deflection value of the polyblends prepared according to the invention is at least the same or sometimes greater than that foreseen when the components of the polystyrene homopolymer and / or the α-methylstyrene / styrene copolymer are each subjected to the same heat deformation test.

Claims (7)

(A) (a ') at least one isopropenyl aromatic monomer of general formula (I) 10 to 70 mol% (based on the total weight of the copolymer) and (a ") at least one vinyl aromatic monomer of general formula (II) 40 to 95 wt. 10 to 75% by weight (based on the total weight of component (B)) of the at least one monomer of general formula (III) and (b ″) the core portion in the grafted rubber concentrate of component (B), Graft-copolymer in the state of grafted rubber concentrate dispersed in component (A) in the form of particles having a core / shell structure, consisting of 90 to 25% by weight of the graft elastomeric rubber (based on the total weight of component (B)) From 5 to 60% by weight (based on the total weight of the polyblend) Tough polyblend with impact resistance and heat deformation.

Wherein Ar is an aromatic radical and G is hydrogen or methyl. 2. The polyblend according to claim 1, wherein the content of component (A) is 60 to 90% by weight. The polyblend according to claim 1, wherein the copolymer (A) contains 20 to 70% by weight of monomer (a '). 2. The polyblend according to claim 1, wherein component (B) contains 20 to 30% by weight of interpolymer (b '). The graft rubber according to any one of claims 1 to 4, wherein the monomer of the general formula (I) is α-methylstyrene, the monomers of the general formulas (II) and (III) are both styrene, and the graft rubber of the core (b ″). Polyblend, wherein the polybutadiene is polybutadiene. The polyblend according to claim 1, wherein the copolymer (A) has a weight average molecular weight (Mw) of 50,000 to 50,000 and a molecular weight distribution of 1 to 3. The polyblend according to claim 1, wherein the copolymer (A) has a weight average molecular weight of 100,000 to 200,000 and a molecular weight distribution of 1 to 2.5.