JPH09176415A - Thermally stable thermoplastic resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an antistatic resin compsn. excellent in thermal stability by compounding an arom. vinyl compd./vinyl cyanide compd. copolymer, a graft copolymer formed by grafting an arom. vinyl compd. and a vinyl cyanide compd. onto a rubber, a specific amine, an amide compd., and an org. phosphite. SOLUTION: This resin compsn., of which the difference in the degree of yellowing between before and after aging at a higher temp. than 80 deg.C for 24hr is lower than 25, is prepd. by compounding 100 pts.wt. compsn. comprising 10-40wt.% graft copolymer formed by grafting an arom. vinyl compd. and a vinyl cyanide compd. onto a rubbery polymer and 60-90wt.% arom. vinyl compd./ vinyl cyanide compd. copolymer with 0.1-3 pts.wt. amine compd. of formula I [wherein R1 is a group of formula II (wherein R' is an 8-24C alkyl) or R'; R2 is H or OCR1 ; R3 is H or a group of formula III; and (m) and (n) are each 0-3], 0.1-7 pts.wt. higher fatty acid amide of formula IV or V [wherein R4 is an 8-18C alkyl; R5 is H or oxymethyl; R6 and R8 are each the same as R4 ; and R7 is (CH2 )l (wherein (l) is 1-2)], and 0.05-3 pts.wt. org. phosphite. The compsn. is an antistatic molding material of a built-in type having an improved thermal stability.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to the thermal stability of an antistatic thermoplastic resin composition. Specifically, it relates to the thermal stability of a kneading type antistatic resin composition containing an amine compound having a specific structure and a higher fatty acid amide and having improved thermal stability.

[0002]

2. Description of the Related Art Acrylonitrile is added to a diene rubber component.
A so-called ABS resin containing a graft copolymer obtained by copolymerizing a vinyl cyanide compound such as methacrylonitrile and an aromatic vinyl compound component such as styrene and α-methylstyrene is used as a so-called ABS resin. Due to its excellent workability, it is widely used for OA equipment and home appliances as a quasi-engineering plastic having intermediate properties between general-purpose resins and engineering resins.

With the expansion of these applications in recent years, development of materials having antistatic properties has been actively promoted for the purpose of preventing damage due to generation of static electricity and dust adhesion due to electrification. As a method of imparting the antistatic property, (1) a method of applying an antistatic agent on the surface of a molded article and (2) a method of kneading an antistatic agent into a resin are generally used. The surface coating method of (1) has an advantage that it can be applied to any material, not limited to the ABS resin, but has a problem of complicated coating process and durability (persistence of antistatic performance). At present, the resin kneading method (2) is generally used.

As the antistatic agent kneaded into the ABS resin, nonionic β-hydroxyalkyl-N-ethanolamine, N, N-di (β-hydroxyalkyl) -N-ethanolamine, 1, Higher alkylamine compounds represented by alkylamide and the like obtained by reacting 2-epoxyalkane with monoethanolamine are most often used from the viewpoint of exhibiting antistatic performance (Japanese Patent Publication No. 5).
0-14261, Japanese Examined Patent Publication No. 4-64355, etc.). Also disclosed is a technique in which an antistatic performance is imparted by using a polyoxyalkylene alkylamine and sodium alkyl sulfate in combination with an ABS resin (Japanese Patent Publication No. 5-37177, etc.). Although higher alkylamine compounds are nonionic compounds, they are widely used because they have an antistatic effect superior to general nonionic compounds because amines are cationic and have ion conductivity.

However, when the higher alkylamine type antistatic agent which is widely used at present is kneaded into the ABS type resin, the heat resistant coloring property of the resin is lowered. In particular, when used in combination with higher fatty acid amides, the heat-resistant coloring property is significantly reduced, and resin pellets and molded products turn yellowish brown during predrying before molding and during high-temperature treatment of molded products, so the amount added is limited. There are problems such as Japanese Patent Publication 4
JP-A-7-45192 and JP-A-54-91556 disclose a technique of adding a phosphite ester as a method for preventing the heat coloring property of a resin composition obtained by mixing a higher fatty acid amide with an ABS resin. However, no mention is made of the combined use of a higher alkylamine-based antistatic agent and the effect of preventing the heat discoloration when combined.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide an excellent antistatic property and mechanical strength without causing coloration during drying of resin pellets. It is to provide a plastic resin composition.

[0007]

The above object of the present invention is to:
"10 to 40 parts by weight of a graft copolymer (A) in which 5 to 80 parts by weight of a rubbery polymer (A-1) are grafted with at least an aromatic vinyl (a) and a vinyl cyanide (b). With respect to 100 parts by weight of a resin composition comprising 60 to 90 parts by weight of a copolymer (B) comprising at least an aromatic vinyl (a) and a vinyl cyanide (b), the general formula (I)
0.1 to 3 parts by weight of the amine compound (C) represented by

Embedded image 0.1 to 7 parts by weight of the higher fatty acid amide (D) represented by the general formula (II) or (III),

Embedded image

[Chemical 6] The thermostable thermoplastic resin composition comprises 0.05 to 3 parts by weight of the organic phosphite (E).

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The rubbery polymer (A
Examples of -1) include polybutadiene and styrene-
Butadiene copolymers, acrylonitrile-butadiene copolymers, styrene-butadiene block copolymers, butyl acrylate-butadiene copolymers, polyisoprene rubber and the like can be mentioned. Among them, polybutadiene, styrene-butadiene copolymer rubber, etc. It is preferable in terms of sex.

As the aromatic vinyl (a) used in the graft component of the graft copolymer (A) or the copolymer (B) in the present invention, styrene, α-methylstyrene, p-methylstyrene, vinyltoluene, Examples thereof include t-butyl styrene, o-ethyl styrene, o-chloro styrene and o, p-dichloro styrene, and styrene and α-methyl styrene are particularly preferable in terms of moldability and color tone. One or more of these can be used.

Examples of vinyl cyanide (II) include acrylonitrile, methacrylonitrile, ethacrylonitrile, and the like, and acrylonitrile is particularly preferable from the viewpoint of chemical resistance.

When an α, β-unsaturated carboxylic acid ester (C) is further used as a monomer forming the graft copolymer (A) or the copolymer (B), the bathochromic property at the time of coloring is improved. It is preferable in that Examples of such α, β-unsaturated carboxylic acid ester (C) include methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, n-butyl (meth) acrylate, T-Butyl (meth) acrylate, n-hexyl (meth) acrylate, cyclohexyl (meth) acrylate, (meth)
Chloromethyl acrylate and (meth) acrylic acid 2-
Chloroethyl and the like can be mentioned. Among them, methyl methacrylate is preferable from the viewpoint of moldability.

Further, as a vinyl monomer (d) copolymerizable with the above compound, N-methylmaleimide,
Use of a maleimide compound such as N-cyclohexylmaleimide or N-phenylmaleimide, an unsaturated dicarboxylic acid such as maleic acid, an unsaturated dicarboxylic acid anhydride such as maleic anhydride, or an unsaturated amide such as acrylamide depending on its purpose. You can In addition, these can use 1 type (s) or 2 or more types.

Aromatic vinyl (a), vinyl cyanide (b), α, β-unsaturated carboxylic acid ester (c) and other substances used in the graft copolymer (A) or copolymer (B). Each composition ratio of the copolymerizable vinyl-based monomer (d) is such that the aromatic vinyl (a) and the α, β-unsaturated carboxylic acid ester compound (c) are 45 to 85% by weight. It is preferable in terms of impact resistance and moldability, and more preferably 50 to 80% by weight. Further, the vinyl cyanide compound (b) is 15 to 55% by weight,
20 to 5 are preferable from the viewpoint of chemical resistance and molding processability.
0% by weight is more preferred. It is preferable from the viewpoint of heat resistance that the other copolymerizable vinyl monomer (d) is 0 to 40% by weight.

The content of the rubbery polymer (A-1) in the graft copolymer (A) is 5 to 80 parts by weight, preferably 1 in terms of mechanical strength and moldability.
It is 0 to 60 parts by weight. When the content of the rubbery polymer (A-1) in the graft copolymer (A) is less than 5 parts by weight, the resulting resin composition has insufficient impact resistance,
If it exceeds 80 parts by weight, the impact resistance is lowered.

The weight average particle diameter of the rubber of the rubbery polymer (A-1) in the graft copolymer (A) is preferably 0.1 to 2.0 μm from the viewpoint of impact resistance and moldability. , And more preferably 0.2 to 1.0 μm. If the weight average particle diameter of the rubber is less than 0.1 μm, the resulting antistatic resin composition may have insufficient impact resistance, and if it exceeds 2.0 μm, the molding processability may deteriorate. .

The graft ratio of the graft copolymer (A) is 15 to 1 from the viewpoint of impact resistance and molding processability.
It is preferably 50%, more preferably 20 to 70%. If the graft ratio is less than 15%, the resulting resin composition may not have sufficient impact resistance, and if the graft ratio exceeds 150%, the moldability and the heat discoloration resistance may deteriorate.

The content of the graft copolymer (A) in the total thermostable thermoplastic resin composition is 10 to 40 parts by weight. The content is 1 from the viewpoint of the balance between impact resistance and rigidity.
5 to 35 parts by weight is preferable. When the content of the graft copolymer (A) is less than 10 parts by weight, impact resistance of the obtained resin composition is insufficient, and when it exceeds 40 parts by weight, moldability, heat resistance and rigidity. Is reduced.

The reduced viscosity of the copolymer (B) is
0.2-1.5d from the viewpoint of impact resistance and molding processability
1 / g is preferable, and more preferably 0.4-1.0 dl
/ G. The reduced viscosity in the copolymer (B) is 0.2
If it is less than dl / g, the resulting resin composition may not have sufficient impact resistance, and if it exceeds 1.5 dl / g, moldability, heat resistance and heat discoloration resistance may be deteriorated.

The method for producing the graft copolymer (A) and the copolymer (B) includes emulsion polymerization, suspension polymerization, bulk polymerization,
Any polymerization method such as solution polymerization may be used and is not particularly limited. There is also no particular limitation on the type of monomer, initiator and chain transfer agent or charging method, and initial charging at once, or part or all of the charging monomer in order to suppress the formation of the composition distribution of the copolymer. May be polymerized continuously or in a divided manner.

The amine compound (C) in the present invention is represented by the general formula (I),

Embedded image R ₁ is R′CH (OH) CH ₂ or R ′. R
′ Is an alkyl group having 8 to 24 carbon atoms. R ₂ is hydrogen or OCR ′, and R ₃ is (CH ₂ CH ₂ O) n.
H or hydrogen (m and n are integers from 0 to 3).

Specifically, stearyldiethanolamine, tallow diethanolamine, polyoxyalkylenealkylamines, lauryldiethanolamine palmitic acid monoesters, stearyldiethanolamine stearic acid monoesters, cetyldiethanolamine palmitic acid monoesters, β-hydroxy. Alkyl-N-ethanolamine, β-hydroxyalkyldiethanolamine, N, N-di (β-hydroxyalkyl) -N-ethanolamine and the like can be mentioned, but other amine compounds or the above compounds can be used. Two
A combination of more than two types may be used.

The content of the amine compound (C) is 0.1 to 3 parts by weight based on 100 parts by weight of the resin composition comprising the graft copolymer (A) and the copolymer (B). . The content is 0.5 from the viewpoint of heat resistance and antistatic property.
~ 2 parts by weight is preferred. If the content is less than 0.1 parts by weight, the antistatic performance of the resulting resin composition will be reduced, and if it exceeds 3 parts by weight, the heat resistance and the heat resistant anticoloring property will be reduced.

Higher fatty acid amide (D) in the present invention
As the compound, those represented by the general formula (II) or (III) are used.

[0024]

Embedded image

Embedded image R ₄ , R ₆ and R ₈ are alkyl groups having 8 to 18 carbon atoms, R ₅ is hydrogen or an oxymethyl group, and R ₇ is — (CH ₂ ) ₁ — (1 is 1 to 2 integer). Specifically, stearic acid amide, oleic acid amide, ricinoleic acid amide, palmitic acid amide, lauric acid amide and methylenebisstearic acid amide, ethylenebisstearic acid amide, ethylenebispaltimic acid amide, ethylenebisoleic acid amide, etc. Can be mentioned.

The content of the higher fatty acid amide (D) is
The amount is 0.1 to 7 parts by weight based on 100 parts by weight of the resin composition including the graft copolymer (A) and the copolymer (B). The content is 1 from the viewpoint of heat resistance and heat discoloration prevention.
-5 parts by weight is preferred. If the content is less than 0.1 part by weight, the moldability of the resulting resin composition will be reduced, and if it exceeds 7 parts by weight, the heat resistance and the heat discoloration resistance will be reduced.

The organic phosphite (E) in the present invention is represented by the general formula (IV),

Embedded image R ₉ , R ₁₀ and R ₁₁ are selected from an alkyl group having 1 to 30 carbon atoms, an alkylallyl group, an alkylphenyl group or an allyl group.

Specifically, lauryl nonylphenyl
Asymmetric phosphite triesters such as phenyl phosphite, ethyl oleyl nonyl phenyl phosphite, lauryl-t-butylphenyl phenyl phosphite, tridodecyl phosphite, tridecyl phosphite, trinonyl phosphite, trihexyl phosphite Phyto-like trialkyl phosphites and diphenyl octadecyl phosphite, diphenyl tetradecyl phosphite, diphenyl dodecyl phosphite, diphenyl cyclohexyl phosphite, diphenyl
There are decyl phosphite, tris (mono, dinonylphenyl) phosphite and the like, but other organic phosphites or the above compounds may be used in combination of two or more kinds.

The content of the organic phosphite (E) is 10% for the graft copolymer (A) and the copolymer (B).
It is 0.05 to 3 parts by weight with respect to 0 parts by weight. The content is preferably 0.1 to 2 parts by weight from the viewpoint of heat resistance and heat resistant discoloration resistance. When the content is less than 0.05 parts by weight,
The resulting resin composition has insufficient resistance to heat discoloration,
On the other hand, if it exceeds 3 parts by weight, the heat resistance, the rigidity and the heat-resistant discoloration resistance are deteriorated.

Regarding the thermal stability of the thermostable thermoplastic resin composition of the present invention, the difference in yellowing degree (ΔY.I.) before and after standing for 24 hours in an environment of 80 ° C. or higher is less than 25. . It is more preferably less than 20, and even more preferably less than 10.

Further, in the production of the thermostable thermoplastic resin composition of the present invention, the amine compound (C) and the organic phosphite ester (E) are melt-mixed in advance, and the mixture is graft-copolymerized. When it is added to the mixture of (A), the copolymer (B) and the higher fatty acid amide (D), the thermal stability is dramatically improved.

Regarding the method for producing the thermostable thermoplastic resin composition of the present invention, various methods such as melt kneading with a Banbury mixer, a roll, and a single-screw or multi-screw extruder can be adopted.

The heat-stable thermoplastic resin composition of the present invention includes vinyl chloride, polyolefins such as polyethylene and polypropylene, polyamides such as nylon 6 and nylon 66, polyethylene terephthalate and polybutylene within a range not impairing the object of the present invention. Polyester such as terephthalate and polycyclohexanedimethyl terephthalate, polycarbonate, and various elastomers can be added to improve the mechanical properties of the molding resin.

Further, if necessary, antioxidants such as hindered phenols and organic compounds containing sulfur, heat stabilizers such as phenols and acrylates, and ultraviolet absorbers such as benzotriazoles, benzophenones and salicylates. , Various stabilizers such as light stabilizers such as organic nickel-based and hindered amine-based, metal salts of higher fatty acids, lubricants such as higher fatty acid amides, plasticizers such as phthalic acid esters and phosphoric acid esters, polybromodiphenyl ether, Halogen-containing compounds such as tetrabromobisphenol-A, brominated epoxy oligomers and brominated polycarbonate oligomers, phosphorus compounds, flame retardants such as antimony trioxide and flame retardant aids, carbon black, titanium oxide, pigments and dyes It can also be added.

Further, reinforcing agents and fillers such as glass fibers, glass flakes, glass beads, carbon fibers and metal fibers can be added. When adding such a reinforcing material or the like, various methods such as melt kneading with a Banbury mixer, a roll, and a single-screw or multi-screw extruder can be adopted.

The thermostable thermoplastic resin composition obtained as described above is a known method currently used for molding thermoplastic resins such as injection molding, extrusion molding, blow molding, vacuum molding, compression molding and gas assist molding. Can be molded by.

[0036]

EXAMPLES In order to more specifically describe the present invention, examples and comparative examples will be described below, but these examples do not limit the present invention. In addition, "%" represents% by weight unless otherwise specified. Regarding the general properties such as mechanical strength and heat resistance of the thermoplastic resin composition, a test piece was molded by injection molding and measured according to the following test method.

(1) Graft ratio Acetone was added to a predetermined amount (m) of the graft copolymer, and the mixture was refluxed for 3 hours. p. m. (1000
After centrifugation at 0 G) for 40 minutes, the insoluble matter was filtered, and the insoluble matter was dried under reduced pressure at 60 ° C. for 5 hours, and the weight (n) was measured. The graft ratio was calculated from the formula (V). Where L
Is the rubber content of the graft copolymer. Grafting rate (%) = {(n−m × L) / (m × L)} × 100 (V)

(2) Reduced viscosity η _{sp / c To} 1 g of the sample, 200 ml of acetone was added, and the mixture was refluxed for 3 hours. p. m. (10000G)
After centrifuging at 40 minutes, the insoluble matter is filtered. The filtrate was concentrated with a rotary evaporator, and the precipitate (acetone-soluble matter) was dried under reduced pressure at 60 ° C. for 5 hours, and then a methyl ethyl ketone solution (0.4 g / d) was measured using an Ubbelohde viscometer.
l), η _{sp / c} was measured at 30 ° C.

(3) Thermostability 100 g of the thermoplastic resin composition pellets obtained were heated to 80 ° C.
After being left in the hot air dryer for 24 hours, the change in yellowing degree (ΔY.I. value) before and after the treatment is measured by the following color difference meter. The measurement is based on JI
According to SK7103, tristimulus values X, Y, and Z were measured with a colorimetric color difference meter (ND-100 type) manufactured by Nippon Denshoku Industries Co., Ltd., and Y. I. Values were calculated. Y. I. = 100 × (1.28X-1.06Z) × Y (VI)

(4) Tensile Yield Strength It was measured according to ASTM D638 (23 ° C.).

(5) Flexural modulus The flexural modulus was measured according to ASTM D790 (23 ° C.).

(6) Deflection temperature under load Measured according to ASTM D648 (6.4 mm, load stress 1.86 MPa).

(7) IZOD Impact Strength It was measured according to ASTM D256 (23 ° C., 12.7 mm, notched).

(8) MFR (melt flow rate) It was measured according to ISO 1133 (220 ° C., 98N load).

(9) Surface resistivity Measured according to ASTM D257 (23 ° C).

Reference Example (A) Graft Copolymer A ₁ : 120 parts of pure water, 0.5 part of glucose, 0.5 part of sodium pyrophosphate, 0.005 part of ferrous sulfate and a table in a reactor substituted with nitrogen. The predetermined amount of polybutadiene latex shown in 1 was charged, and the temperature in the reactor was raised to 65 ° C. while stirring. When the internal temperature reached 65 ° C., polymerization was started, and a predetermined amount of a mixture of monomers and t-dodecyl mercaptan shown in Table 1 was continuously added over 5 hours. At the same time, an aqueous solution comprising cumene hydroperoxide and potassium oleate shown in Table 1 was continuously added over 7 hours to complete the reaction.

To the obtained latex was added 1 part by weight of 2,2′-methylenebis (4-methyl-6-t-butylphenol) based on 100 parts by weight of the solid content of the latex.
Subsequently, this latex was coagulated with sulfuric acid, neutralized with sodium hydroxide, washed, filtered, and dried to obtain a powdery graft copolymer A ₁ . The graft ratio of this graft copolymer was 45%.

A _{2 to} A ₆ : Graft copolymers A _{2 to} A ₆ were obtained in the same manner as in A ₁ at the composition ratios shown in Table 1.

(B) Copolymer B ₁ : A monomer mixture comprising 73 parts of styrene and 27 parts of acrylonitrile was suspension polymerized to obtain a bead-shaped copolymer B ₁ . The reduced viscosity of the copolymer was 0.65 dl / g.

B ₂ : A monomer mixture of 73 parts of styrene and 27 parts of acrylonitrile was suspension polymerized to obtain a bead-like copolymer B ₂ . The reduced viscosity of the copolymer is 1.60 d.
1 / g.

B ₃ : A monomer mixture consisting of 76 parts of styrene and 24 parts of acrylonitrile was suspension polymerized to obtain a bead-like copolymer B ₃ . The reduced viscosity of the copolymer is 0.15d.
1 / g.

B ₄ : Emulsion polymerization of a monomer mixture consisting of 40 parts of styrene, 30 parts of acrylonitrile and 30 parts of α-methylstyrene to obtain a beaded copolymer B ₄ . The reduced viscosity of the copolymer was 0.60 dl / g.

B ₅ : Copolymer B ₅ was obtained by emulsion polymerization of a monomer mixture consisting of 40 parts of styrene, 30 parts of acrylonitrile and 30 parts of N-phenylmaleimide. The reduced viscosity of the copolymer was 0.65 dl / g.

(C) Amine Compound C ₁ : N-hydroxyethyl-N-2-hydroxyalkylamine C ₂ : N, N-di-hydroxyethyl-N-2-hydroxyalkylamine C ₃ : stearyldiethanolamine C ₄ : Stearyl diethanolamine stearic acid monoester

(D) Higher fatty acid amide compound D ₁ : Stearic acid amide D ₂ : Ethylenebisstearic acid amide

(E) Phosphosulfite E ₁ : Diphenyl (mono-i-decyl) phosphite E ₂ : Tris (mono, dinonylphenyl) phosphite

Examples 1 to 17 and Comparative Examples 1 to 7 (A) Graft copolymer, (B) copolymer, (C) amine compound, (D) higher fatty acid amide compound and (E) described in Reference Examples. After blending the organic phosphite in a ratio shown in Table 2, a 40 mmφ single screw extruder (cylinder set temperature was 2 in Examples 1 to 9 and 12 to 17 and Comparative Examples 1 to 7).
Melt-kneading was performed at 30 ° C. and 260 ° C. other than those to obtain a pellet-shaped resin. However, in Examples 12 to 13, (C)
The amine compound and (E) the organic phosphite are melt-mixed in advance, and the mixture is mixed with (A) the graft copolymer,
The (B) copolymer and (D) higher fatty acid amide compound were blended and melt-kneaded to obtain a pellet resin. Injection molding machine IS-50A manufactured by Toshiba Machine Co., Ltd.
(The cylinder set temperature is 230 ° C. in Examples 1 to 9 and 12 to 17 and Comparative Examples 1 to 7, and 260 ° C. in other cases.
The test piece was molded at all mold temperatures of 60 ° C., various characteristics were evaluated, and the results are shown in Tables 3 to 6.

According to Examples 1 to 17, the thermoplastic resin composition in the range defined in the present invention is excellent in heat resistant coloration-preventing property,
It is also found that it has good antistatic properties and also has excellent mechanical properties.

However, in Comparative Examples 1 to 7, (A) graft copolymer, (B) copolymer, (C) amine compound,
Since the compounding ratio of the (D) higher fatty acid amide compound or the (E) organic phosphite ester is outside the range specified in the present invention, Comparative Examples 1 to 5 and 7 have low resistance to heat discoloration, and Comparative Example 6 Had low impact resistance. Furthermore, Comparative Examples 2 to
4 and 7 had low heat resistance, and Comparative Example 5 had low rigidity and impact resistance.

[0060]

[Table 1]

[Table 2]

[Table 3]

[Table 4]

[Table 5]

[Table 6]

[0061]

INDUSTRIAL APPLICABILITY The resin composition of the present invention has antistatic properties, excellent mechanical properties, and excellent thermal stability, especially color tone stability. Therefore, it can be used for molding electrical appliances such as OA equipment and home appliances. It is suitable as a material.

Claims (12)

[Claims] 1. A graft copolymer (A) in which 5 to 80 parts by weight of a rubbery polymer (A-1) is grafted with at least an aromatic vinyl (a) and a vinyl cyanide (b).
10 to 40 parts by weight, at least aromatic vinyl (a) and vinyl cyanide (b)
100 parts by weight of the resin composition consisting of 60 to 90 parts by weight of the copolymer (B) consisting of the amine compound (C) of 0.1 to 3 represented by the general formula (I).
Parts by weight, 0.1 to 7 parts by weight of the higher fatty acid amide (D) represented by the general formula (II) or (III), Embedded image The difference in yellowing degree (ΔY.I.) before and after leaving the organic phosphite (E) 0.05 to 3 parts by weight for 24 hours in an environment of 80 ° C. or more is less than 25. A thermostable thermoplastic resin composition comprising: 2. The graft component of the graft copolymer (A), in place of the aromatic vinyl (a), or further has an α, β-unsaturated carboxylic acid ester (c). Thermostable thermoplastic resin composition. 3. The graft component of the graft copolymer (A) can be copolymerized with at least aromatic vinyl (a), vinyl cyanide (b), α, β-unsaturated carboxylic acid ester (c) and these. The thermostable thermoplastic resin composition according to claim 1, which is a copolymer grafted with another vinyl monomer (d). 4. The copolymer (B) contains, as a copolymerization component, an α, β-unsaturated carboxylic acid ester (C) in place of or in addition to the aromatic vinyl (A). The thermostable thermoplastic resin composition according to any one of 1. 5. The copolymer (B) is at least an aromatic vinyl (a), a vinyl cyanide (b), an α, β-unsaturated carboxylic acid ester (c) and a vinyl-based monomer copolymerizable therewith. 5. A copolymer composed of a monomer (D).
The thermostable thermoplastic resin composition described. 6. The weight average particle diameter of the rubber in the rubbery polymer (A-1) is 0.1 to 2.0 μm.
5. The thermostable thermoplastic resin composition according to any one of 5 above. 7. The thermostable thermoplastic resin composition according to claim 1, wherein the graft ratio of the graft copolymer (A) is 15 to 150%. 8. The content of the rubbery polymer (A-1) in the graft copolymer (A) is 100 in the graft copolymer (A).
The thermostable thermoplastic resin composition according to claim 1, which is 10 to 60 parts by weight based on parts by weight. 9. The reduced viscosity of the copolymer (B) is 0.2.
The heat-stable thermoplastic resin composition according to any one of claims 1 to 8, having a content of ˜1.5 dl / g. 10. The graft copolymer (A) 15 to 3
With respect to 100 parts by weight of a resin composition composed of 5 parts by weight and 65 to 85 parts by weight of the copolymer (B), 0.5 parts of the amine compound (C) represented by the general formula (I) is used.
To 2 parts by weight, 1 to 5 parts by weight of the higher fatty acid amide (D) represented by the general formula (II) or (III), and 0.1 to 2 parts by weight of the organic phosphite ester (E). Item 10. A thermostable thermoplastic resin composition according to any one of items 1 to 9. 11. The thermostable thermoplastic resin composition according to claim 1, wherein the higher fatty acid amide (D) is a higher fatty acid amide represented by the general formulas (II) and (III). . 12. 0.1 to 7 parts by weight of the higher fatty acid amide (D) represented by the general formula (II) and / or (III) is added to 100 parts by weight of the resin composition, and then, 0.1 to 3 parts by weight of the amine compound (C) represented by the general formula (I) and the organic phosphite (E)
The method for producing a thermostable thermoplastic resin composition according to any one of claims 1 to 11, wherein 0.05 to 3 parts by weight of the mixture is melt-mixed in advance.