JPH02173141A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain a composition having excellent impact resistance, moldability, chemical resistance and surface appearance by compounding a specific modified vinyl polymer in combination with an ABS resin and an aromatic polyester resin. CONSTITUTION:The objective composition is produced by compounding (A) 1-98 pts.wt. of an ABS resin, (B) 1-98 pts.wt. of an aromatic polyester resin and (C) 1-70 pts.wt. (the sum of A, B and C is 100 pts. wt.) of a modified vinyl polymer produced by the copolymerization of (i) 50-90wt.% of an aromatic vinyl compound, (ii) 9-50wt.% of vinyl cyanide and (iii) 0.1-20wt.% of an alpha,beta-unsaturated carboxylic acid metal salt and an alpha, beta-unsaturated carboxylic acid satisfying the formula X/(X+Y)X100=5-100% wherein X and Y are wt.% of the alpha,beta-unsaturated carboxylic acid metal salt and an alpha, beta-unsaturated carboxylic acid in the copolymer, respectively. The component A is preferably a resin containing polybutadiene and/or styrene-butadiene copolymer rubber.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a thermoplastic resin composition having excellent impact resistance, moldability, chemical resistance, and surface appearance.

<Prior art> Acrylonitrile-butadiene-snarene copolymer resin (ABS resin) has excellent impact resistance and moldability,
Widely used as a general-purpose thermoplastic resin. but,
It does not have sufficient chemical resistance or heat resistance, and its use is restricted under severe conditions.

In addition, aromatic polyester resin (hereinafter abbreviated as polyester) has excellent mechanical properties, electrical properties, chemical resistance,
It has heat resistance, low moisture absorption, processability, etc., and is widely used as an engineering plastic, but it has the disadvantage of poor impact resistance.

In order to improve the impact resistance of polyester, blending it with ABS resin has been proposed (for example, JP-A-49-97
081, JP 56-14546, JP 57-117556, JP 57-137350, JP 60-36558, JP 60-1
23550, etc.).

Blends of polyesters and graft copolymers obtained by graft copolymerizing α-unsaturated dicarboxylic acid anhydrides or unsaturated carbonamides with other monomers onto rubber-like polymers have also been proposed (for example, Japanese Unexamined Patent Publication 1987-1997
081, JP 59-138256, JP 60-144349, JP 60-26284
7, JP-A-61-130366, etc.).

Additionally, a method has been proposed in which an epoxy resin is added to a mixture of polyester and diene polymer (Japanese Patent Application Laid-Open No. 59-1999).
-149951).

<Problems to be solved by the invention> However, to date, the numerically proposed methods have not yielded compositions that are fully satisfactory in terms of the total balance of compatibility, mechanical properties, fluidity, etc. do not have.

For example, a simple blend of ABS resin and polyester has poor compatibility and extremely low mechanical properties.

In addition, in the case of a blend of polyester and a graft copolymer obtained by graft copolymerizing a monomer having a functional group reactive or affinity with polyester together with other monomers onto a rubber-like polymer, the impact resistance is Although it can be improved, it is impractical because the compatibility is poor and the surface condition of the molded product is poor.

Furthermore, when an epoxy resin is added to a mixture of polyester and diene polymer, the epoxy resin is localized and hardened, resulting in essentially poor fluidity.

Therefore, an object of the present invention is to obtain a resin composition that has the chemical resistance, heat resistance, and surface appearance of polyester without impairing the moldability of ABS resin, and has impact resistance higher than that of ABS resin. shall be.

<Means for Solving the Problems> The present inventors have conducted intensive studies to solve the above problems, and as a result, have arrived at the present invention.

That is, the present invention includes (A) 1 to 98 parts by weight of ABS resin (B)
Aromatic polyester resin 1 to 98 parts by weight (C) (A)
Aromatic vinyl 50-90% by weight (ro) vinyl cyanide 9
~50% by weight (c) α-unsaturated unsaturated carboxylic acid metal salt and α-unsaturated unsaturated carboxylic acid 0x1-20 having the relationship of the following formula = 5-100% (where X and y are , indicates the weight percent of α, β-, β-carboxylic acid metal salt and α, β-, β-carboxylic acid in the copolymer.
1 to 70 parts by weight, and (A)
, (B) and (C) in a total amount of 100 parts by weight.

The present invention will be specifically explained below.

The ABS resin (A> used in the present invention) refers to diene rubber (
a), a vinyl cyanide monomer (3), an aromatic vinyl monomer (3), and (2), if necessary, other copolymerizable monomers, and The entire amount is diene rubber (
This is a resin composition of a graft copolymer obtained by graft copolymerization with (a) and a copolymer obtained by copolymerizing the remaining monomers.

Examples of the diene rubber (a) used in the present invention include polybutadiene rubber, acryloni-1-lylubutadiene copolymer rubber, styrene-butadiene copolymer rubber, polyisoprene rubber, etc. Two or more types can be used in combination.

In the present invention, polybutadiene and/or styrene-butadiene copolymer rubber is preferably used.

Examples of the vinyl cyanide (b) include acrylonitrile, methacrylonitrile, and the like, with acrylonitrile being particularly preferred.

Examples of the aromatic vinyl (c) include styrene, α-methylstyrene, p-methylstyrene, and pt-butylstyrene. Among them, styrene and/or α-methylstyrene are preferably used.

Other copolymerizable monomers (d) include α-unsaturated carboxylic acid esters such as methyl methacrylate, ethyl methacrylate, t-butyl methacrylate, cyclohexyl methacrylate, glycidyl acrylate, glycidyl methacrylate, anhydrous αβ such as maleic acid and itaconic anhydride
- Unsaturated dicarboxylic acid anhydrides, imide compounds of α-unsaturated dicarboxylic acids such as N-phenylmaleimide, N-methylmaleimide, N-t-butylmaleimide, and the like.

There is no particular restriction on the composition ratio of ABS resin (A), but from the viewpoint of moldability and impact resistance of the resulting thermoplastic resin composition, diene rubber (A) is used for 100 parts by weight of ABS resin. Preferably 5 to 85 parts by weight, more preferably 15 to 75 parts by weight. Similarly, vinyl cyanide (b) is preferably 5 to 50 parts by weight, particularly preferably 7 to 45 parts by weight, and more preferably 8 to 40 parts by weight.

Regarding the aromatic vinyl (c), 10 to 90 parts by weight is heavy, and 13 to 83 parts by weight is particularly preferable, and 17 to 90 parts by weight is particularly preferable.
It can be preferably used in a range of 77 parts by weight.

Further, it is preferable that the content of the diene rubber (A) in the entire thermoplastic resin composition is in the range of 1 to 60% by weight,
In particular, it is preferable that the weight range is 3 to 55% by weight, more preferably 5 to 50% by weight. Furthermore, if the weight of the diene rubber in the resin composition is 15 to 25% by weight, the impact resistance of the resin composition is 15 to 25% by weight. are dramatically improved compared to each alone. In this case, particularly significant effects occur when polybutylene terephthalate is selected as the aromatic polyester.

There are no particular restrictions on the method for producing ABS resin (A>), and commonly known methods such as bulk polymerization, solution polymerization, bulk suspension polymerization, suspension polymerization, and emulsion polymerization are used.
It is also possible to obtain the above composition by blending copolymerized resins (graft).

The aromatic polyester (B) used in the present invention is a polyester having an aromatic ring in the polymer chain unit, and is a polyester obtained by a polycondensation reaction with an aromatic dicarboxylic acid (or its ester-forming derivative) as the main component. It is a combination or copolymer.

The aromatic dicarboxylic acids mentioned here include terephthalic acid, isophthalic acid, orthophthalic acid, 1.5-naphthalenedicarboxylic acid, 2.5-naphthalenedicarboxylic acid, 2.
6-naphthalenedicarboxylic acid, 2.2-biphenyldicarboxylic acid, 3.3-monobiphenyldicarboxylic acid, 4.
4-biphenyl dicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 4,4-monodiphenylmethane dicarboxylic acid, 4,4'-diphenylsulfone dicarboxylic acid, 4□4'-diphenyl isof.

Ropylidene dicarboxylic acid, 1,2-bis(phenoxy)
Ethane-4,4'-dicarboxylic acid, 2.5-andhracene-dicarboxylic acid, 2,6-andhracene-dicarboxylic acid,
4.4-p-terphenylenedicarboxylic acid, 2,5-
Examples include pyridinedicarboxylic acid, and terephthalic acid is preferably used.

Two or more of these aromatic dicarboxylic acids may be used in combination. In addition, if the amount is small, one or more types of aliphatic dicarboxylic acids such as adipic acid, azelaic acid, dodecanedioic acid, and sebacic acid, and alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid may be used in combination with these aromatic dicarboxylic acids. can do.

In addition, as diol components, ethylene glycol, propylene glycol, butylene glycol, hexylene glycol, neopentyl glycol, 2-methyl-1
, 3-propanediol, diethylene glycol, aliphatic diols such as triethylene glycol, alicyclic diols such as 1,4-cyclohexane dimetatool, etc.
and mixtures thereof. In addition, if it is a small amount, long chain diols with a molecular weight of 400 to 6,000, such as polyethylene glycol, poly-1゜3-propylene glycol, polytetramethylene glycol, etc.
Specific examples of aromatic polyesters that may be copolymerized include polyethylene terephthalate 1-, polypropylene terephthalate, and polybunalene terephthalate 1-.
, polyethylene terephthalate, polyethylene naphthalate-1-, polyethylene-1,2-bis(phenoxy)
In addition to ethane-4,4'-dicarboxylate, there are also copolymerized polyesters such as polyethylene inphthalate/terephthalate, polybutylene terephthalate/isophthalate, polybutylene terephthalate/decane dicarboxylate, etc. Among these, polybutylene terephthalate and Polyethylene terephthalate can be preferably used.

In the present invention, the amount of aromatic polyester used is 0.5
% O-chlorophenol solution measured at 25°C has a relative viscosity of 1.15 to B, particularly preferably 13 to 2.5. If the relative viscosity is less than 1.15, the impact strength of the resulting molded product will be low, and if it is greater than 3.0, the surface gloss of the molded product will be poor, which is not preferred.

The modified vinyl polymer (C) (hereinafter referred to as copolymer (C)) used in the present invention is (a) aromatic vinyl 50 to 90% by weight (b)
Vinyl cyanide 9-50% weight) α-unsaturated unsaturated carboxylic acid metal salt and α
Unsaturated unsaturated carboxylic acid 01 20 5-100% (where, X and y are the weights of α,β unsaturated carboxylic acid metal salt and α,β-,β-carboxylic acid in the copolymer This is a modified vinyl polymer made by copolymerizing a monomer consisting of

Examples of the aromatic vinyl (a) include styrene, α-methylstyrene, p-methylstyrene, and pt-butylstyrene. Among them, styrene and α-methylstyrene are preferred. Examples of vinyl cyanide include acrylonitrile and methacrylonitrile. Among them, acrylonitrile is preferred.

The α,β-,β-carboxylic acid metal salt and α,β-,β-carboxylic acid (c) in the monomer mixture (C) include acrylic acid, methacrylic acid, ethacrylic acid, maleic acid,
Examples include fumaric acid, itaconic acid, crotonic acid, cinnamic acid, and metal salts thereof, and among them, acrylic acid, methacrylic acid, and metal salts thereof are preferred. Also, these are 2
More than one species can be used together.

The metal species are TA and IB in the periodic table of elements.

[A, ■B. Metals of the 4th period of groups IIA and II, such as Na, Cu. Mg. Ca, Ba, Zn
, Cd. Al, Fe. Examples include Co, Ni, etc., and among them, Na, Mg, Ca, Ba, and Zn are preferable.

The α,β-,β-carboxylic acid metal salt in the copolymer (C) may be introduced by directly polymerizing the α,β-unsaturated carboxylic acid metal salt, or it may be introduced by first polymerizing the aromatic vinyl ,
After polymerizing a copolymer consisting of vinyl cyanide, α, β-, β-carboxylic acid, a neutralization reaction is performed in an organic solvent or in an extruder, or a copolymer consisting of aromatic vinyl, vinyl cyanide, α .

It may be introduced by polymerizing a copolymer consisting of β-unsaturated carboxylic acid ester and then performing a saponification reaction in an organic solvent or in an extruder.

The neutralization reaction or saponification reaction is carried out using basic compounds of the metals listed above, such as hydroxides such as sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, zinc hydroxide, etc. , alkoxides such as sodium methoxide, sodium ethoxide, and magnesium ethoxide, and oxides such as sodium oxide, potassium oxide, magnesium oxide, and zinc oxide.

The amount of these basic compounds added can be arbitrarily selected depending on the amount of the desired α-unsaturated carboxylic acid metal salt in the copolymer.

As the organic solvent used in the neutralization reaction, aliphatic alcohols, aromatic hydrocarbons, halogenated hydrocarbons, ketones, etc. can be used alone or in any combination.

It is also possible to copolymerize 0 to 70 parts by weight of other copolymerizable monomers with respect to 100 parts by weight of the monomers (a), (b), and (c).

Other copolymerizable monomers include methyl methacrylate,
α-unsaturated unsaturated carboxylic acid esters such as ethyl methacrylate, t-butyl methacrylate, cyclohexyl methacrylate, glycidyl acrylate, glycidyl methacrylate, α-unsaturated unsaturated dicarboxylic acid such as maleic anhydride, itaconic anhydride, etc. Examples include imide compounds of α1β-unsaturated dicarboxylic acids such as acid anhydride-phenylmaleimide, N-methylmaleimide, and Nt-butylmaleimide.

The proportion of α-unsaturated unsaturated carboxylic acid and α, β-unsaturated carboxylic acid is expressed as the weight percent in each copolymer.
and y, the relationship is x/(x+y)X100=5 to 100%.

” The copolymerization amount occupied by the α-unsaturated unsaturated carboxylic acid metal salt and the α-unsaturated unsaturated carboxylic acid (C) in the copolymer (C) composed of bipedal copolymerized components is preferably 0.
．． 1% to 28% by weight, more preferably 0.2 to 10% by weight
is within the range of When the copolymerization amount is less than 0.1% by weight, the impact strength of the composition is low, and when it exceeds 28% by weight, the copolymer tends to gel, making it difficult to obtain molded products with good surface conditions. do not have.

There are no particular limitations on the method for producing the copolymer (C), and commonly known methods such as bulk polymerization, solution polymerization, bulk-suspension polymerization, suspension polymerization, and emulsion polymerization can be used. (a), (b)
There is no particular restriction on the method of charging (c), and it is possible to charge all at once at the initial stage, or to continuously charge some or all of the monomers to prevent the formation of a compositional distribution of the copolymer. Alternatively, polymerization may be carried out while charging in portions.

ABS resin (A) in the thermoplastic resin composition of the present invention
, the blending ratio of polyester (B) and copolymer (C) is (A> is 1 to 98 parts by weight, preferably 2 to 94 parts by weight, particularly preferably 5 to 90 parts by weight, and (B) is 98 to 1 part by weight) double weight part, preferably 94 to 2 parts by weight, particularly preferably 90 parts by weight
~5 parts by weight, (C) is 1 to 70 parts by weight, preferably 2 to 65 parts by weight, particularly preferably 5 to 60 parts by weight, and the total proportion of (A>, (B) and (C) is The ratio is 100 parts by weight. (A> is less than 1 part by weight, (B) is 9 parts by weight.
If (C) exceeds 8 parts by weight, if (C) is less than 1 part by weight, the resulting resin composition will have poor impact resistance; Chemical properties and mold transferability are poor, and if (C) exceeds 70 parts by weight, molding processability is unfavorable.

The ratio of α-unsaturated unsaturated carboxylic acid metal salt and α-unsaturated unsaturated carboxylic acid in the copolymer (C) is x/ (x+y
) X 1. If OO<5%, the surface appearance of the molded product will be poor, which is not preferable.

There are no particular limitations on the method for producing the thermoplastic resin composition of the present invention, and generally known methods can be employed.

That is, after uniformly mixing ABS resin (A), polyester (B), and copolymer (C) in the form of pellets or small pieces using a high-speed mixer, etc., a uniaxial or multi-screw mixer with sufficient kneading capacity is used. Methods such as melt-kneading with a shaft extruder, etc.
Various methods can be adopted. In addition, ABS resin (A) and polyester (B), polyester (B and copolymer (C), ABS resin (A) and copolymer (C), etc. are pre-kneaded in advance, and then the predetermined blending ratio is adjusted. It is also possible to knead the mixture by adjusting the amount.

In addition to ABS resin (A, polyester (B), and copolymer (C)), the thermoplastic resin composition of the present invention may optionally contain polystyrene (PS), styrene/acrylonitrile copolymer (SAN), polymethacrylic Methyl acid (PI)
VIMA), styrene/methyl methacrylate/acrylonitrile copolymer, α-methylstyrene/acrylonitrile copolymer, α-methylstyrene/styrene/acrylonitrile copolymer, α-methylstyrene/methyl methacrylate/acrylonitrile copolymer, p- Vinyl polymers such as methylstyrene/acrylonitrile copolymer, styrene/N-phenylmaleimide copolymer, methacrylic acid-butadiene-styrene terpolymer (MBS) resin, AES @ resin, AAS resin 1 finger , polycarbonate, polycaproamide (nylon 6), polyhexamethylene adipamide (nylon 66) and other thermoplastic resins, or polyethylene, polypropylene, ethylene/propylene copolymer, ethylene/butene-1 copolymer. , ethylene/propylene/dicyclopentadiene copolymer, ethylene/propylene 15-ethylidene-2-norbornene copolymer, ethylene/propylene/1,4-
By appropriately mixing polyolefin rubbers such as hexadiene copolymer, ethylene 7/vinyl acetate copolymer, and ethylene/butyl acrylate copolymer, it is also possible to adjust the physical properties and characteristics to more desirable ones. Depending on the purpose, reinforcing materials and fillers such as pigments, dyes, glass fibers, metal fibers, metal flakes, and carbon fibers, heat stabilizers, antioxidants, ultraviolet absorbers, light stabilizers, lubricants, plasticizers, and electrostatic charges are also added. Inhibitors, flame retardants, etc. can be added.

<Examples> Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples. As an evaluation of impact resistance, 1/2' degree Izot impact strength was measured according to ASTM D256-56. As an evaluation of moldability, the melt viscosity was measured using a flow tester at a resin temperature of 250 to 280°C and a load of 50°C.
The measurement was carried out under the condition of kg. As an evaluation of heat resistance, Vicat softening temperature was measured according to ASTM D-1525. Chemical resistance was determined by immersing an injection-molded square plate in methanol and gasoline at 23°C for 24 hours and visually observing the surface of the square plate.

The surface appearance was determined by measuring the glossiness of the surface of the molded product.

Note that the following parts and percentages represent parts by weight and percentages by weight, respectively.

Reference Example 1 ABS resins A-1 to A-3 were manufactured according to the following formulations.

A-1: Polybutadiene latex (rubber particle size 0.2
40 parts of a monomer mixture consisting of 70% styrene and 30% acrylonitrile was emulsion polymerized in the presence of 60 parts (in terms of solid content) (5μ, gel content 80%).

The obtained graft copolymer was coagulated with sulfuric acid, neutralized with caustic soda, washed, filtered, and dried to prepare a powdery graft copolymer (A-1>).

A-2: Polybutadiene latex 4 used in A-1
Methyl methacrylate in the presence of 0 parts (based on solids) 15
After emulsion polymerization of 60 parts of a monomer mixture consisting of 65% styrene and 20% acrylonitrile, a powdery graft copolymer A-23 was prepared in the same manner as A-1.

A-3: After dissolving 20 parts of polybutadiene rubber (“Diene” NFB5A manufactured by Asahi Kasei Corporation) in 70 parts of styrene and 10 parts of acrylonitrile, bulk polymerization was performed to obtain a graph I copolymer (A-3> was prepared.

Reference Example 2 Modified vinyl copolymers C-1 to C-7 and vinyl copolymer C-8 were prepared according to the following formulations.

C-1: A bead-shaped modified vinyl copolymer (C'-1>) was prepared by suspension polymerization of 70 parts of styrene, 24 parts of acrylonitrile, and 6 parts of methacrylic acid.

Subsequently, 4 parts of a 50% aqueous sodium hydroxide solution was added to 100 parts of this copolymer, and the temperature was increased to 220°C.
A copolymer (C-2> was prepared by extrusion under the following conditions.The proportion of α-unsaturated unsaturated carboxylic acid metal salt (sodium methacrylate) determined by acid determination was (sodium methacrylate) and α-unsaturated unsaturated carboxylic acid (methacrylic acid).
5゜1%, α-unsaturated unsaturated carboxylic acid metal salt (1-lium methacrylate) and α-unsaturated carboxylic acid in the copolymer.
The proportions of unsaturated carboxylic acid (methacrylic acid) were 5.07% and 1.88%, respectively.

C-2: 20 parts of methyl methacrylate, 65 parts of styrene,
After suspension polymerizing a monomer mixture consisting of 15 parts of acrylonitrile, a bead-shaped copolymer (C-2) was prepared in the same manner as C-2.
'-2) was obtained. Subsequently, 15 parts of a 50% aqueous sodium hydroxide solution was added to 100 parts of this copolymer, and the mixture was extruded at a temperature of 220°C to form a copolymer (A-
2> was prepared. The proportions of each component in the copolymer determined by IR measurement, NMR measurement, and acid calibration are: methyl methacrylate, styrene, acrylonitrile, and sodium methacrylate: 2.4/64.1/14°8/18. The weight ratio was 7.

C-3; 58 parts of styrene, 15 parts of α-methylstyrene,
25 parts of acrylonitrile and 2 parts of magnesium acrylate are bulk polymerized to produce bead-shaped modified vinyl copolymer (C
-3> was prepared.

C-4: 58 parts of styrene, 15 parts of α-methylstyrene,
Bead-shaped modified vinyl copolymer (C-4>) was prepared by bulk polymerizing 25 parts of acrylonitrile, 1 part of magnesium acrylate, and 1 part of acrylic acid.

C-5: 58 parts of styrene, 15 parts of α-methylstyrene,
25 parts of acrylonitrile, 0.0 parts of magnesium acrylate.
5 parts of acrylic acid and 1.5 parts of acrylic acid were subjected to bulk polymerization to prepare a bead-shaped modified vinyl copolymer <C-5).

C-6: After carrying out suspension polymerization of a monomer mixture consisting of 95 parts of styrene and 5 parts of methacrylic acid, a bead-shaped copolymer (C'-6> was obtained in the same manner as C-2).

Subsequently, 3 parts of a 50% aqueous sodium hydroxide solution was added to 100 parts of this copolymer, and the temperature was increased to 220°C.
A copolymer (C-6> was prepared by extrusion under the following conditions.The proportion of α-unsaturated unsaturated carboxylic acid metal salt (sodium methacrylate) determined by acid determination was as follows: α-unsaturated unsaturated carboxylic acid metal salt (sodium methacrylate) and α-unsaturated unsaturated carboxylic acid vi (methacrylic acid), and α-unsaturated unsaturated carboxylic acid metal salt (sodium methacrylate) and α
The proportions of unsaturated carboxylic acid (methacrylic acid) were 3.75% and 1.97%, respectively.

C-7: A bead-shaped modified vinyl copolymer (C-7) was prepared by suspension polymerization of 72 parts of styrene, 24 parts of acrylonitrile, and 4 parts of methacrylic acid.

C-8: Bead-shaped modified vinyl copolymer (C-8
> was prepared.

Examples 1 to 8 A-1 to A-3 produced in Reference Example 1, C-1 to C-5 produced in Reference Example 2, and PBT-1 as polyester
20OL (polybutylene terephthalate manufactured by Toshishiku Co., Ltd.) were mixed in a Henschel mixer at the mixing ratio shown in Table 1, and then extruded at 250°C using a 40mmφ extruder.
After being extruded at ℃ and pelletized, each pellet was injection molded at a molding temperature of 250°C and a mold temperature of 60°C to prepare each test piece, and its physical properties were evaluated. These results are shown in Table-1.

Comparative Examples 1 to 5 A-1 to A-3 produced in Reference Example 1, C-1 to C-8 produced in Reference Example 2, and PBT-1 as polyester
20OL (polybutylene terephthalate manufactured by Toshiku Co., Ltd.) were mixed in a Henschel mixer at the compounding ratio shown in Table 1, and then extruded at a temperature of 2 using a 40 mmφ extruder.
After extruding at 50°C and pelletizing each pellet, each pellet was subjected to injection molding at a molding temperature of 250°C and a mold temperature of 60°C to prepare each test piece, and its physical properties were evaluated. These results are also shown in Table-1.

Examples 9 to 16 As polyester I) E"r"-J-135 (polyethylene terephthalate manufactured by Mitsui Pet 181 fat Co., Ltd.)
The extrusion temperature was set to 280°C. The molding temperature was set to 280°C.
The conditions were the same as in Examples 1 to 8 except that the mold temperature was 80°C. The blending ratio and measurement results of physical properties are shown in Table-2.

Comparative Examples 6 to 10 Using PET-J-155 (polyethylene terephthalate manufactured by Mitsui Pet Resin Co., Ltd.) as the polyester, the extrusion temperature was 280°C, the molding temperature was 280°C, the mold temperature was 8
The conditions were the same as in Comparative Examples 1 to 5 except that the temperature was 0°C. The blending ratio and measurement results of physical properties are also shown in Table-2.

The following is clear from the Examples and Comparative Examples.

That is, the products obtained according to the present invention are excellent in impact resistance, moldability, heat resistance, chemical resistance, and surface appearance. On the other hand, vinyl copolymers that do not contain α, β-unsaturated carboxylic acid metal salts and α-unsaturated unsaturated carboxylic acids as copolymerization components (C-8> have poor impact resistance, and are modified without vinyl cyanide). Vinyl copolymer (C-
6) has insufficient impact resistance, high melt viscosity, and poor moldability.

<Effects of the Invention> The thermoplastic resin composition of the present invention is an ABS resin (A>), a polyester (B), and a specific modified vinyl-based resin containing an α-unsaturated unsaturated carboxylic acid metal salt and an α-unsaturated unsaturated carboxylic acid. Copolymer (C) is blended in a specific ratio, but the compatibility of (A) and (B) is particularly low due to the presence of α-unsaturated unsaturated carboxylic acid metal salt and α-unsaturated unsaturated carboxylic acid. Very good.

Furthermore, the thermoplastic resin composition of the present invention has moldability and impact resistance equivalent to that of ABS resin, and heat resistance and chemical resistance of polyester, so it can be used in various molded products that take advantage of these properties. can.

Claims (1)

[Scope of Claims] (A) 1 to 98 parts by weight of ABS resin (B) 1 to 98 parts by weight of aromatic polyester resin (C) (
a) Aromatic vinyl 50-90% by weight (b) Vinyl cyanide 9-50% by weight (c) α,β-unsaturated carboxylic acid metal salt and α,β-unsaturated carboxylic acid having the relationship of the following formula 0 .1 to 20% by weight x/(x+y)×100 = 5 to 100% (where x and y are α,β-unsaturated carboxylic acid metal salt and α,β-unsaturated carbon 1 to 70 parts by weight of a modified vinyl polymer formed by copolymerizing a monomer consisting of (indicates the weight percent of acid), and the total amount of (A), (B) and (C) is 100 parts by weight of a thermoplastic resin composition.