JPH083249A - Thermoplastic resin and composition thereof - Google Patents

Abstract

PURPOSE:To obtain a thermoplastic resin improved in chemical resistance, impact resistance, surface gloss, and vibration-damping properties by grafting a specific monomer mixture onto a block copolymer comprising an aromatic vinyl polymer and a conjugated diene polymer. CONSTITUTION:A thermoplastic resin is obtained by grafting 95 to 20wt.% monomer mixture (B) onto 5 to 80wt.% block copolymer (A). The copolymer (A) has a number-average molecular weight of 20,000 to 300,000 and comprises 10 to 60wt.% of aromatic vinyl polymer block (a) and conjugated diene polymer block (b) of which the peak temperature of the primary dispersion of tan deltais in the range of -25 to 40 deg.C. The mixture (B) comprises 5 to 95wt.% aromatic vinyl monomer and 95 to 5wt.% one or more kinds of monomer selected from among vinyl cynide monomers, (meth)acrylic acid monomers and maleimide monomers. The graft ratio is 20 to 80% and the size of the dispersed particles is 0.1 to 1mum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermoplastic resin having excellent chemical resistance, surface gloss, impact resistance, and excellent vibration damping performance, and a composition thereof.

[0002]

2. Description of the Related Art ABS resins have been widely used for automobile parts, electric appliances, office equipment and the like. However, for automobile applications, there are demands for noise, vibration problems, low vibration inside the automobile, and low noise, and even in electrical appliances, low vibration of refrigerators, washing machines, vacuum cleaners, etc.
There is a demand for low noise, and also for office equipment, low vibration and low noise of copiers and printers.

In order to solve these problems, vinyl cyanide compound-aromatic vinyl compound copolymer, olefin resin, and polymer block mainly containing aromatic vinyl compound and isoprene or isoprene and butadiene are mainly used. A thermoplastic resin composition prepared by melt-kneading a block copolymer consisting of a polymer block having a vinyl bond content of 40% or more and having a main dispersion peak of tan δ at 0 ° C. or higher is proposed (Japanese Patent Laid-Open Publication No. No. 279543), the vibration damping property is improved as compared with the ABS resin, but the performances such as rigidity, impact resistance and surface gloss are insufficient.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a thermoplastic resin which is excellent in vibration damping properties and chemical resistance, impact resistance and surface gloss.

[0005]

The present inventors have arrived at the present invention as a result of extensive studies on the above points.
That is, the present invention comprises an aromatic vinyl polymer block (A) and a conjugated diene polymer block (B), the content of the block (A) is 10 to 60% by weight, and the tan δ of the block (B) is Peak of main dispersion is -2
Number average molecular weight in the range of 5 to 40 ° C. is 20,000
Of block copolymer (I) of 5 to 80% by weight, aromatic vinyl monomer (a) of 5 to 95% by weight and vinyl cyanide type, (meth) acrylic acid type and maleimide type One or more monomers (b) 95-5
95 to 20% by weight of the monomer mixture (II) consisting of 10% by weight is graft-copolymerized, and the graft ratio is 20 to 80%.
The present invention relates to a thermoplastic resin having a dispersed particle size of 0.1 to 1 μm and a composition of the thermoplastic resin and another thermoplastic resin.

The present invention will be described in more detail below.

The block (A) component of the block copolymer (I) in the present invention comprises an aromatic vinyl monomer. Specific examples of the aromatic vinyl-based monomer used include styrene, α-methylstyrene, 1-vinylnaphthalene, and 3
-Methyl styrene, 4-propyl styrene, 4-cyclohexyl styrene, 4-dodecyl styrene, 2-ethyl-4-benzyl styrene, 4- (phenylbutyl) styrene and the like can be mentioned, but it is necessary to use at least one of them. Is. Most preferred of them is styrene.

The block (B) component comprises a conjugated diene monomer. Specific examples of the conjugated diene-based monomer used include isoprene, butadiene, 2,3-dimethylbutadiene, 2-methyl-3-ethyl-butadiene, 1,
3-pentadiene, 3-methyl-1,3-pentadiene, 2-ethyl-1,3-pentadiene, 1,3-hexadiene, 2-methyl-1,3-hexadiene, 3,4
-Dimethyl-1,3-hexadiene, 1,3-heptadiene, 3-methyl-1,3-heptadiene, 1,3-octadiene, cyclopentadiene, chloroprene, myrcene and the like, and one or two of them. Used above. Of these, isoprene or isoprene-butadiene is preferable. When two or more kinds are used, the form may be random, block, or tape.

The block copolymer (I) is required to have a peak temperature of main dispersion of tan δ (loss tangent) obtained by viscoelasticity measurement in the range of -25 to 40 ° C. If there is a peak only at a temperature lower than -25 ° C, sufficient damping performance cannot be obtained in the normal temperature range, and conversely, if there is a peak only at a temperature higher than 40 ° C. Sufficient vibration damping performance cannot be obtained in a normal temperature range, and the impact resistance of the resulting thermoplastic resin is insufficient, which is not preferable.

The proportion of the block (A) in the block copolymer (I) needs to be in the range of 10 to 60% by weight. If this ratio is less than 10%, the rigidity of the thermoplastic resin obtained will be insufficient, and conversely, if it exceeds 60%, the impact resistance of the thermoplastic resin obtained will be insufficient.

Further, the block copolymer (I) needs to have a number average molecular weight in the range of 20,000 to 300,000. When the molecular weight is less than 20,000, the mechanical properties of the resulting thermoplastic resin are insufficient, and when it exceeds 300,000, the moldability of the obtained thermoplastic resin deteriorates.

The block copolymer (I) is A-
A block form represented by (BA) n or (AB) n is preferably used. Here, n is an integer of 1 or more. Of these, the ABA form is most preferred.

In the present invention, the block copolymer (I) is produced by the following various methods.

That is, (a) a method of sequentially polymerizing an aromatic vinyl-based monomer with an alkyllithium compound as an initiator and then a conjugated diene-based monomer, (b) an aromatic vinyl-based monomer A method of polymerizing a conjugated diene-based monomer and coupling it with a coupling agent, or sequentially polymerizing a conjugated diene-based monomer with a dilithium compound as an initiator, and then an aromatic vinyl-based monomer. The method of making it etc. is mentioned.

In those methods, examples of the alkyllithium compound include an alkyl residue having 1 to 10 carbon atoms.
Alkyl compounds are listed, but methyllithium, ethyllithium, pentyllithium, and butyllithium are particularly preferable. Dichloromethane, dibromomethane, dichloroethane, dibromoethane, dibromobenzene and the like are used as the coupling agent. Examples of the dilithium compound include naphthalenedilithium and dithiohexylbenzene. The amount of the monomer used depends on the required molecular weight.
About 0.01 to 0.2 parts by weight of the initiator with respect to 0 parts by weight,
When a coupling agent is used, it is used in the range of about 0.04 to 0.8 parts by weight.

In order that the temperature of the main dispersion peak of tan δ (loss tangent) of the block copolymer (I) is −25 to 40 ° C., dimethyl ether, diethyl ether, tetrahydrofuran as a polymerization additive. (THF) and other ethers, ethylene glycol dimethyl ether, diethylene glycol dimethyl ether and other glycol ethers, triethylamine, N, N, N ', N'-tetramethylethylenediamine (TMEDA), It is preferable to use an amine compound such as N-methylmorpholine.

It is preferable to use a solvent in the polymerization for easy control. As the solvent, an organic solvent which is inert to the polymerization initiator is used. Especially carbon number is 6 ~
Twelve aliphatic, alicyclic or aromatic hydrocarbons are preferably used. Examples thereof include hexane, heptane, cyclohexane, methylcyclohexane, benzene and the like.

The polymerization can be carried out by 0 to 0 in any polymerization method.
It is carried out at a temperature range of 80 ° C. for 0.5 to 50 hours.

The thermoplastic resin of the present invention comprises 5 to 80% by weight of the block copolymer (I) and 95 to 2 of the monomer mixture (II).
It is a graft copolymer with 0% by weight, the block copolymer (I) is 5 to 80% by weight, and the monomer mixture (II) is 95% by weight.
It is necessary to be in the range of up to 20% by weight. When the block copolymer (I) is less than 5% by weight, impact resistance becomes insufficient, and when it is more than 80% by weight, rigidity becomes insufficient.

The monomer mixture (II) is composed of 5 to 95% by weight of an aromatic vinyl monomer (a) and a vinyl cyanide monomer,
(Meth) acrylic acid-based and maleimide-based monomers (b) consisting of 95 to 5% by weight, and aromatic vinyl-based monomer (a) in the range of 5 to 95% by weight, One to two or more monomers (b) of vinyl cyanide, (meth) acrylic acid, and maleimide are 95 to 5
It must be used in the weight% range. When the amount of the aromatic vinyl monomer (a) is less than 5% by weight, the moldability is deteriorated, and when it is more than 95% by weight, the chemical resistance and hardness are
And heat resistance becomes insufficient.

As the aromatic vinyl monomer (a), styrene, α-methylstyrene, 1-vinylnaphthalene,
3-methylstyrene, 4-propylstyrene, 4-cyclohexylstyrene, 4-dodecylstyrene, 2-ethyl-4-benzylstyrene, 4- (phenylbutyl) styrene, halogenated styrene and the like can be mentioned, and these are one of them. Alternatively, two or more kinds are used. Among them, styrene, α-methylstyrene, or styrene containing 50% by weight or more is preferable.

Examples of the vinyl cyanide-based monomer, which is one of the monomers (b), include acrylonitrile and methacrylonitrile, with acrylonitrile being preferred.

The (meth) acrylic acid type monomers include acrylic acid, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, amyl acrylate, hexyl acrylate, octyl acrylate. -, 2-ethylhexyl acrylate, cyclohexyl acrylate, dodecyl acrylate, octadecyl acrylate, phenyl acrylate, benzyl acrylate, 2-hydroxyethyl acrylate, Two
-Hydroxypropyl acrylate, glycidyl acrylate, tetrahydrofurfuryl acrylate, 2-
(Dimethylamino) ethyl acrylate, acrylamide, methacrylic acid, methyl methacrylate, ethyl methacrylate, butyl methacrylate, amyl methacrylate, hexyl methacrylate, octyl methacrylate.
, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, dodecyl methacrylate, octadecyl methacrylate, phenyl methacrylate, benzyl methacrylate, 2-hydroxyethyl methacrylate.
, 2-hydroxypropyl methacrylate, glycidyl methacrylate, tetrahydrofurfuryl methacrylate, 2- (dimethylamino) ethyl methacrylate,
Methacrylamide and the like can be mentioned, but methyl methacrylate is preferable.

Further, maleimide type monomers include maleimide, N-methylmaleimide, N-ethylmaleimide, N-propylmaleimide, N-isopropylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide, N- (P-bromo). Phenyl) maleimide, N
Examples thereof include-(P-chlorophenyl) maleimide, but N-phenylmaleimide is preferable.

The monomer mixture (II) is graft-copolymerized with the block copolymer (I), and the graft ratio is
It must be in the range of 20-80%, which is 2
If it is lower than 0%, the impact strength is insufficient, and if it is higher than 80%, the elastic modulus and the heat distortion temperature are lowered.

The dispersed particle diameter of the thermoplastic resin is 0.1 to 0.1.
It must be in the range of 1 μm, which is 0.1 μm
If it is less than m, the impact strength is insufficient, and if it is more than 1 μm, the surface gloss of the molded product deteriorates.

The thermoplastic resin of the present invention is produced by a known method such as an emulsion polymerization method, a suspension polymerization method, a bulk polymerization method, a solution polymerization method or a combination thereof.

As an example, in the emulsion polymerization method, 5 to 80% by weight of the block copolymer (I) is added to the aromatic vinyl monomer (a).
Monomer mixture (II) consisting of 5 to 95% by weight of vinyl cyanide-based, (meth) acrylic acid derivative, and maleimide-based monomer (b) of 95 to 5% by weight. It is dissolved in 95 to 20% by weight and emulsion graft copolymerized.

If necessary, benzene, toluene, xylene, hexane, cyclohexane or the like can be used as a solvent in the monomer mixture (II).

As the polymerization method, the block copolymer (I) is dissolved in the monomer mixture (II), and water, an emulsifier, a radical polymerization initiator and the like are added, and (i) the whole amount is added at the start of the polymerization. , (Ro) Add in two or more parts,
() A method such as continuously adding the whole amount or a part thereof at a constant rate is used.

Examples of the emulsifier include rosin acid salts such as potassium rosinate, alkali metal salts of fatty acids such as sodium oleate, sodium laurate and sodium stearate, and sulfuric acid ester salts of aliphatic alcohols such as sodium lauryl sulfate. And alkylallyl sulfonic acid such as dodecylbenzene sulfonic acid, etc., and these are used in one kind or in two or more kinds. Preferred is potassium rosinate or potassium oleate.

As the radical polymerization initiator, organic hydroperoxides such as cumene hydroperoxide, diisopropylbenzene hydroperoxide and parametric hydroperoxide, and ferrous sulfate, sodium pyrophosphate and dextroses. Redox system or persulfate in combination with a reducing agent typified by a dextroose formulation with and a ferrous sulfate, disodium ethylenediaminetetraacetate, and a sulfoxylate formulation with sodium formaldehyde sulfoxylate. Peroxides such as azobisisobutyronitrile and benzoylperoxide are used alone.

Examples of the molecular weight modifier include mercaptans such as t-dodecyl mercaptan, n-dodecyl mercaptan and mercaptoethanol, or tapinolene.
Examples thereof include terpene mixtures consisting of dipentene, t-terpinene and a small amount of other cyclic terpenes, and halogenated hydrocarbons such as chloroform and carbon tetrachloride.

The thermoplastic resin of the present invention can be used as a composition with other thermoplastic resins. At that time, other thermoplastic resins are generally well known, and specific examples thereof include polyamide and polyethylene terephthalate.
, Polybutylene terephthalate, polymethylmethacrylate, polyacetal, polyvinylidene fluoride, high impact polystyrene, polyurethane, styrene-maleic anhydride copolymer and the like. The proportion of the composition is 5 to 95% by weight of the thermoplastic resin, and 95 to 95% of the other thermoplastic resin.
It is preferably 5% by weight. Further, as another thermoplastic resin, a copolymer composed of 5 to 95% by weight of an aromatic vinyl-based monomer and 95 to 5% by weight of a vinyl cyanide-based monomer may be used. At that time, as the aromatic vinyl-based monomer, styrene, α-methylstyrene, 1-vinylnaphthalene, 3-methylstyrene, 4-propylstyrene, 4
-Cyclohexylstyrene, 4-dodecylstyrene, 2
-Ethyl-4-benzylstyrene, 4- (phenylbutyl) styrene, halogenated styrene and the like can be mentioned, with preference given to styrene or α-methylstyrene. Examples of vinyl cyanide-based monomers include acrylonitrile and methacrylonitrile, with acrylonitrile being preferred.

Further, as other thermoplastic resin, ABS resin, AES resin, polycarbonate, polyvinyl chloride or the like can be used.

The thermoplastic resin and its composition of the present invention are
Various known additives such as rubber, lubricants, antioxidants, plasticizers, light stabilizers, colorants, antistatic agents, flame retardants and the like may be added within a range not impairing the spirit of the present invention. Further, a fiber reinforcing agent such as glass fiber or a filler such as an inorganic filler may be filled. Examples of the rubber include styrene-based TPE such as SEPS, SEBS and SIS,
Examples of the lubricant include rubbers such as IR, EPR, and EPDM, and examples of the lubricant include stearic acid, behenic acid, stearoamidic acid, methylenebisstearamide, hydroxystearic acid triglyceride, paraffin wax, ketone wax, octyl alcohol, and curing agent. Examples of the antioxidant include oils such as 2,6-di-t-butyl-4-methylphenol and stearyl-β- (3,5-di-t-butyl-4-hydroxyphenyl) propione. G, triethylene glycol-bis-3- (3-t-butyl-4)
-Hydroxy-5-methylphenyl) propionate and other phenol-based compounds, N, N-di-2-naphthyl-p-phenylenediamine and other amine-based plasticizers such as mineral oil and polyethylene glycol. Examples of the light stabilizer include pt-butyl-phenyl salicylate, 2,2'-dihydroxy-4-methoxybenzophenone, and 2- (2-hydroxy-4-n-octoxyphenyl). Benzotriazole and the like, as the colorant, for example, titanium oxide, carbon black, other inorganic and organic pigments, and as the antistatic agent, for example, stearoamidopropyldimethyl-β-hydroxyethylammonium nitrate. Etc. are used. Examples of the flame retardant include organic halogen-based flame retardants such as tetrabromobisphenol A, decabromodiphenyl oxide and brominated polycarbonate, and antimony oxide, aluminum hydroxide, zinc borate, tricresyl. Non-halogen flame retardants such as phosphates may be mentioned.

The thermoplastic resin of the present invention and its composition are
It is effectively used for refrigerators, washing machines, vacuum cleaners and other chassis, copiers, printers and other housings, and speaker parts.

[0038]

EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited thereto. In addition,
Each measured value in the examples complies with the following evaluation methods.

The number average molecular weight was determined by the GPC method.

The styrene polymer block content was 699.
It was determined from a calibration curve by the infrared method based on the absorption of the phenyl group at cm-1.

The value of tan δ and the peak temperature of the main dispersion are
It was determined by measuring the viscoelastic spectrum with Rheovibron (manufactured by Orientec).

The graft ratio is determined as an elastomer content (k) by separating a certain amount (x) of the thermoplastic resin into soluble (y) and insoluble (z) by Soxhlet extraction using acetone. It was calculated by the following formula.

Graft ratio = (z−kx) / kx × 100 (%) The dispersed particle diameter was measured using an electron microscope. The average particle diameter was based on the number average. Tensile strength is ASTM D
638.

The flexural modulus was in accordance with ASTM D790.

Izod impact strength is ASTM D 2
56 (notched, 23 ° C.). The loss factor (η), which indicates the damping performance, is 100 mm in length x 10 mm in width x 3 mm in thickness.
The test piece of No. 2 was subjected to vibration by a vibrator to measure the degree of resonance of the test piece by the resonance method. The measurement frequency was 500 Hz and the measurement temperature was 25 ° C.

For the surface gloss, the average value of the gloss values of the dumbbell test piece gate part and the end part of ASTM D638 was determined, and 90% or more was evaluated as ◯ and less than 90% was evaluated as x. The incident angle of the light source was 60 degrees.

Regarding the chemical resistance, the molded product was immersed in JIS No. 6 kerosene and allowed to stand at 50 ° C. for 1 hour to determine whether or not there was any abnormality. The ones in which no abnormalities were observed were evaluated as ○, and the ones in which abnormalities such as crack generation and whitening were observed were evaluated as x.

Reference Example 1 (Preparation of Block Copolymer (I-1)) Cyclohexane, n-butyllithium and TMEDA were added in a pressure resistant reactor purged with dry nitrogen, and then styrene monomer and isoprene were added. A monomer and a styrene monomer were sequentially added and polymerized to obtain an ABA type block copolymer (I-1). The obtained (I-1) had a styrene polymer block content of 20% by weight, a tan δ main dispersion peak temperature of 15 ° C. and a number average molecular weight of 73,000.

Reference Example 2 (Preparation of block copolymer (I-2)) A block copolymer (I-) was prepared in the same manner as in Reference Example 1 except that diethyl ether was used instead of TMEDA.
2) was obtained. The obtained (I-2) had a styrene polymer block content of 22% by weight and a main dispersion peak of tan δ.
The temperature was 1.5 ° C. and the number average molecular weight was 79,000.

Reference Example 3 (Preparation of Copolymer (I-3)) A block copolymer (I-3) was obtained in the same manner as in Reference Example 1 except that TMEDA was not used. Obtained (I-
In 3), the content of the styrene polymer block was 23% by weight, the peak temperature of the main dispersion of tan δ was −53 ° C., and the number average molecular weight was 77,000.

Example 1 30 parts by weight of the block copolymer (I-1) was added to styrene 5
Dissolved in a mixture of 2.5 parts by weight and 17.5 parts by weight of acrylonitrile (70 parts by weight), 150 parts by weight of distilled water, 3 parts by weight of potassium rosinate, 0.05 part by weight of ferrous sulfate, 0 parts of dextroses. 0.5 parts by weight, sodium pyrophosphate 0.
4 parts by weight of 0.25 part of n-dodecyl mercaptan was added, and the mixture was emulsified by stirring with a homomixer. The emulsion was heated to 80 ° C. in a pressure resistant reactor replaced with dry nitrogen,
75 parts by weight of distilled water, 1.5 parts by weight of potassium rosinate, and 0.3 parts by weight of cumene hydroperoxide were added at a constant rate, and the reaction was carried out at 100 ° C. for 3 hours. A thermoplastic resin (III-1) was obtained by solidifying with an aqueous solution of sulfuric acid, washing with water and dehydration drying. After pelletizing (III-1) by an extruder, a test piece was prepared by an injection molding machine and various physical properties were measured. The results are shown in Table 1.

Example 2 The block copolymer (I-1) was replaced with the block copolymer (I-
A thermoplastic resin (III-2) was obtained in the same manner as in Example 1 except that the thermoplastic resin (III-2) was used instead. Table 1 shows the physical properties measured in the same manner as in Example 1.

Example 3 A thermoplastic resin (III-3) was obtained in the same manner as in Example 1 except that the acrylonitrile of Example 1 was replaced with methyl methacrylate. Table 1 shows the physical properties measured in the same manner as in Example 1.

Comparative Example 1 A thermoplastic resin (IV-1) was prepared in the same manner as in Example 1 except that the block copolymer (I-1) was replaced with (I-3).
I got Table 1 shows the physical properties measured in the same manner as in Example 1.

Comparative Example 2 A thermoplastic resin was prepared in the same manner as in Example 1 except that the block copolymer (I-1) of Example 1 was replaced with (I-3) and the acrylonitrile was replaced with methyl methacrylate. (IV-2) was obtained. Table 1 shows the physical properties measured in the same manner as in Example 1.

[0056]

[Table 1]

As is clear from the results shown in Table 1, in Examples 1 to 3, the peak temperature of the main dispersion of tan δ was -5 to 4
It is a thermoplastic resin using a block copolymer in the range of 0 ° C., the graft ratio is in the range of 20 to 80%, and the dispersed particle size is in the range of 0.1 to 1 μm, and has excellent chemical resistance. It has surface gloss and impact resistance, and has excellent vibration damping performance. On the other hand, in Comparative Example 1 and Comparative Example 2, tan δ
Is a thermoplastic resin using a block copolymer whose main dispersion peak temperature is outside the range of -5 to 40 ° C, and has a graft ratio outside the range of 20 to 80% and a dispersed particle diameter of 0.1. ~ 1
Outside the range of μm, the chemical resistance and surface gloss are poor, and the impact resistance and vibration damping performance are insufficient.

Example 4 30 parts by weight of thermoplastic resin (III-1) and 70 parts by weight of ABS resin (GA-501 manufactured by Sumitomo Dow Co., Ltd.) were kneaded and pelletized by a twin-screw extruder to form a thermoplastic resin composition. Got Table 2 shows the physical properties measured in the same manner as in Example 1.

Example 5 70 parts by weight of a thermoplastic resin (III-1) and 30 parts by weight of an AS resin (SAN-C manufactured by Mitsubishi Monsanto Co., Ltd.) were kneaded and pelletized with a twin-screw extruder to obtain a thermoplastic resin composition. Obtained. Table 2 shows the physical properties measured in the same manner as in Example 1.

Example 6 40 parts by weight of thermoplastic resin (III-2) and polycarbonate
60 parts by weight of Sumitomo Dow Co., Ltd. (300-22) were kneaded by a twin-screw extruder and pelletized to obtain a thermoplastic resin composition. Table 2 shows the physical properties measured in the same manner as in Example 1.

Example 7 60 parts by weight of a thermoplastic resin (III-3) and 40 parts by weight of polyvinyl chloride (S-1008, manufactured by Kaneka Chemical Co., Ltd.) were kneaded and pelletized by a twin-screw extruder. A composition was obtained. Table 2 shows the physical properties measured in the same manner as in Example 1.

Comparative Example 3 30 parts by weight of block copolymer (I-1) and 70 parts by weight of ABS resin (GA-501 manufactured by Sumitomo Dow Co., Ltd.) were kneaded and pelletized by a twin-screw extruder to form a thermoplastic resin composition. Got Table 2 shows the physical properties measured in the same manner as in Example 1.

Comparative Example 4 70 parts by weight of a thermoplastic resin (IV-1) and 30 parts by weight of an AS resin (SAN-C manufactured by Mitsubishi Monsanto Co., Ltd.) were kneaded by a twin-screw extruder and pelletized to obtain a thermoplastic resin composition. Obtained.
Table 2 shows the physical properties measured in the same manner as in Example 1.

Comparative Example 5 40 parts by weight of the thermoplastic resin (IV-1) and 60 parts by weight of polycarbonate (300-22 manufactured by Sumitomo Dow Co., Ltd.) were kneaded and pelletized by a twin-screw extruder. A composition was obtained. Table 2 shows the physical properties measured in the same manner as in Example 1.

Comparative Example 6 40 parts by weight of ABS resin (Sumitomo Dow, GA-501) and polycarbonate (Sumitomo Dow, 300-22) 6
0 part by weight was kneaded by a twin-screw extruder and pelletized to obtain a thermoplastic resin composition. Table 2 shows the physical properties measured in the same manner as in Example 1.

Comparative Example 7 60 parts by weight of a thermoplastic resin (IV-2) and 2 parts by weight of 40 parts by weight of polyvinyl chloride (S-1008 manufactured by Kaneka Corporation) are used.
The mixture was kneaded by a shaft extruder and pelletized to obtain a thermoplastic resin composition. Table 2 shows the physical properties measured in the same manner as in Example 1.

[0067]

[Table 2]

As is clear from the results shown in Table 2, Examples 4 to 7 are compositions using the thermoplastic resins of Examples 1 to 3, and have excellent chemical resistance, surface gloss and impact resistance. And has excellent vibration damping performance. On the other hand, Comparative Example 3
Has sufficient vibration damping performance but insufficient impact resistance, surface gloss, and chemical resistance. Comparative Example 4 has insufficient vibration damping performance, impact resistance, and surface gloss. Comparative Example 5 has insufficient vibration damping performance, surface gloss, and chemical resistance. The vibration damping performance of Comparative Example 6 is insufficient. Comparative Example 7 has insufficient vibration damping performance, impact resistance, and surface gloss.

From the above, the thermoplastic resin and the composition thereof of the present invention have excellent chemical resistance, surface gloss and impact resistance, and are extremely excellent in vibration damping performance, and have a good balance of these characteristics. It is clear that it has extremely excellent characteristics.

[0070]

As described above in detail, the thermoplastic resin of the present invention and the composition thereof have excellent chemical resistance, surface gloss and impact resistance, and have extremely excellent vibration damping performance. There is provided an extremely excellent thermoplastic resin having a good balance of the above properties and its composition.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masami Murasawa 2-3-10 Nihonbashi, Chuo-ku, Tokyo Kuraray Co., Ltd.

Claims (5)

[Claims] 1. An aromatic vinyl polymer block (A) and a conjugated diene polymer block (B), wherein the content of the block (A) is 10 to 60% by weight, and the tan δ of the block (B). Has a main dispersion peak of −25 to 40 ° C. and a number average molecular weight of 20,000 to 300,0.
No. 00 block copolymer (I) of 5 to 80% by weight, aromatic vinyl monomer (a) of 5 to 95% by weight, and one of vinyl cyanide, (meth) acrylic acid and maleimide or 95 to 20% by weight of a monomer mixture (II) consisting of 95 to 5% by weight of two or more kinds of monomers (b) is graft-copolymerized, and the graft ratio is 20 to 80% and the dispersed particle size is 0. A thermoplastic resin having a thickness of 1 to 1 μm. 2. The thermoplastic resin according to claim 1, wherein the conjugated diene in the conjugated diene polymer is isoprene. 3. The thermoplastic resin 5 to 95 according to claim 1.
A thermoplastic resin composition comprising 1% by weight and 95 to 5% by weight of another thermoplastic resin. 4. The heat according to claim 3, wherein the other thermoplastic resin is a copolymer composed of 5 to 95% by weight of an aromatic vinyl monomer and 95 to 5% by weight of a vinyl cyanide monomer. Plastic resin composition. 5. The other thermoplastic resin is ABS resin or AES.
The thermoplastic resin composition according to claim 3, which is a resin, polycarbonate or polyvinyl chloride.