JPS63165451A - Impact-resistant thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain the titled composition capable of providing molded articles having excellent impact resistance, particularly notched impact resistance, by blending a mixture of a polyamide resin with rubber-reinforced styrene based graft copolymer resin with a copolymer resin containing an N-substituted maleimide component. CONSTITUTION:An impact-resistant thermoplastic resin composition obtained by blending 100pts.wt. resin mixture consisting of (A) 20-80wt.% polyamide resin and (B) 20-80wt.% rubber-reinforced styrene based graft copolymer resin with (C) 0.01-40pts.wt. copolymer resin consisting of 50-80wt.% aromatic vinyl monomer component, 5-47wt.% N-substituted maleimide monomer component, preferably a system of N-phenylmaleimide used together and 0-40wt.% other vinyl based monomer components copolymerizable therewith and (D) 0-15pts.wt. copolymer resin consisting of 60-90wt.% aromatic vinyl monomer component, 0-40wt.% vinyl cyanide monomer component and 0-40wt.% methyl methacrylate component.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to impact-resistant thermoplastic resin compositions. More specifically, by blending a copolymer resin containing an N-substituted maleimide monomer component with a resin mixture consisting of a polyamide resin and a rubber-reinforced styrenic graft copolymer resin, excellent impact resistance, Among these, the present invention relates to a resin composition from which a molded article having particularly excellent notched impact strength can be obtained.

``Conventional technology'' Polyamide resin has traditionally been used as an engineering plastic in various mechanical parts due to its excellent properties such as abrasion resistance, electrical properties, mechanical strength, and chemical resistance. There is.

This polyamide resin has drawbacks such as high water absorption and low impact resistance, particularly low notched impact strength. Furthermore, it also has the disadvantage of being inferior in heat resistance, moldability, etc., compared to styrene polymers, which are general-purpose resins. Because polyamide resins have such drawbacks, their uses as engineering plastics are limited, and the excellent properties of polyamide resins may not be utilized.

As a method to improve these drawbacks of polyamide resin,
For example, it is known to mix this with a 7-acrylonitrile-butadiene-styrene copolymer (A B S resin) to create a blend composition (e.g., Japanese Patent Publication No. 38-1989).
(See Publication No. 23476). However, polyamide resin and A
Blend compositions with BS resins have poor compatibility, and when molded into molded products, there are drawbacks such as delamination due to poor compatibility and a drastic decrease in mechanical strength such as tensile strength. For this reason, polyamide resin and AB S at
As a method to improve compatibility with styrenic polymers such as fats, a styrenic polymer containing an α,β-unsaturated carboxylic acid anhydride component is added to a blend of both resins as a third
It has been proposed that the third component be blended as a component (for example, see Japanese Patent Publication No. 60-47304), but if this third component is blended, it is true that the Bo177 resin and the styrene polymer will be physically fine. However, the impact resistance of the three-component resin composition is hardly improved.

As described above, it is currently not possible to obtain a resin material that has both the excellent properties of polyamide resin and styrene polymer and also has excellent impact resistance. be.

"Problems to be Solved by the Invention" The present inventors have aimed to solve the above-mentioned drawbacks that have conventionally existed in resin compositions of polyamide resins and rubber-reinforced styrene graft copolymers. As a result of extensive research, we have arrived at the present invention. That is,
By blending a copolymer resin containing an N-substituted maleimide monomer component with a resin mixture consisting of a polyamide resin and a rubber-reinforced styrene graft copolymer, it has excellent heat resistance and impact resistance. It is an object of the present invention to provide a resin composition from which a molded article with an improved Fizot impact strength of 1iiiy can be obtained.

"Means for Solving Problem F" The gist of the present invention is that polyamide resin (A) 2
Resin mixture 1 consisting of 0 to 80% by weight and 20 to 80% by weight of rubber-reinforced styrenic graft copolymer resin (B)
00 parts by weight, aromatic vinyl monomer component 30-80% by weight, N-substituted maleimide monomer component 5-65% by weight, and other vinyl monomer components copolymerizable with these monomers 0 ~40% by weight (However, the total monomer component is 100% by weight.)
A copolymer resin (C)Q consisting of 01 to 40 parts by weight, and 60 to 90% by weight of an aromatic vinyl monomer component, 0 to 40% by weight of a vinyl cyanide monomer component, and 0 to 40% of a methyl methacrylate component. Copolymer resin (D
)0 to 15 parts by weight of an impact-resistant thermoplastic resin composition.

The present invention will be explained in detail below.

The polyamide resin (A
) refers to a known injection moldable nylon-based thermoplastic resin. Specific examples of polyamide resin (A) include nylon 6, nylon 66, copolymerized nylon (a copolymer of caprolactam and adipic acid hexamethylene diamine salt). polymer), nylon 610, nylon 612, nylon 11,
Examples include nylons known by common names such as nylon 12 and nylon MXD6 (condensation polymer of metaxylylene diamine and 7-dipic acid), copolymers containing these as main components, and mixtures thereof. . Among these examples, nylon 6, nylon 66 and copolymerized nylon are particularly preferred.

The rubber-reinforced styrene-based graft copolymer resin (B) constituting the resin composition according to the present invention has a glass transition temperature of 0.
Rubber-reinforced styrene-based graft copolymer resin, which refers to a graft copolymer resin obtained by grafting a monomer mixture containing 40% by weight or more of an aromatic vinyl monomer as a main component, to a rubber-like polymer with a temperature of Specific examples of the polymer resin (B) include acrylonitrile, butanoene, and styrene.
(ABSIII resin), methyl methacrylate/butadiene/styrene copolymer (MBS resin), methyl methacrylate/7crylonitrile/butadiene/styrene copolymer (MABStH resin), acrylonitrile/acrylic rubber/styrene copolymer ( AAS resin), acrylonitrile/EPDM rubber/styrene copolymer (A
ESljl resin), acrylonitrile-chlorinated polyethylene-styrene copolymer (AC8 resin), or a mixture thereof. This rubber-reinforced styrene-based graft copolymer resin (B) has excellent impact resistance, and when blended with other resin materials, it is effective as an InvactoMod 7T ear (impact resistance imparting material). In order for the rubber-reinforced styrenic graft copolymer resin (B) to effectively function as Invactomod 7-year in the resin composition according to the present invention, the average particle diameter of the graft rubber in the graft copolymer must be Select within the range of 0.05 to 4 μ theory,
It is particularly preferable to select the graft gel content in the resin (B) within the range of 10 to 90% by weight based on the entire resin (B). Outside this range, the impact resistance of the resin composition according to the present invention will decrease. The effect of improving physical properties such as properties is small.

In the present invention, the average particle diameter of the graft rubber is 0.0
For the range from 5 to about 0.5 μ-, please contact Coulter Electronics Lt.
d,) IH Nanosizer J (Coulter@Nan
Regarding the range of about 0.5 to 4μ, which is the weight average particle diameter measured in a system in which raw rubber latex before graft polymerization is dispersed in water at 23°C, using Manufactured by Denshi Co., Ltd. [Refers to the weight average particle diameter measured at 23°C using a Coulter Counter Model TAIIJ of a solution in which a small amount of the graft copolymer is dissolved in dinotylformamide and a small amount of potassium thiocyanate is added. .

In the present invention, the graft gel content means that the resin (B) is dispersed and dissolved in 77 tons of water at 23°C, then separated into insoluble and soluble parts by centrifugation, and this insoluble content is divided into dry weight. It refers to the ratio to the weight of the entire resin (B).

This rubber-reinforced styrenic graft copolymer resin (B) is produced by using a known emulsion polymerization method, suspension polymerization method, bulk polymerization method, or t# liquid polymerization method. It can be produced by graft polymerizing a monomer mixture according to a known method.

The resin mixture constituting the composition of the present invention includes 20 to 80% by weight of the polyamide resin (A) and 20 to 80% of the rubber-reinforced styrenic graft copolymer resin (B).
The above-mentioned resin mixture is the base resin composition of the composition of the present invention, and must be blended within the above-mentioned range. However, as a blending method, the resin (C ) or the resin (D) described later, it is not necessary to mix and knead only the resin (A) and the resin (B) in advance, and the resin composition of the present invention may contain
Ultimately, it is sufficient that the content is within the above range, but if the blending ratio is outside the above range, the physical properties of the resulting resin composition, such as mechanical strength, heat resistance, or processability, will deteriorate.

The copolymer resin (C) constituting the resin composition of the present invention includes 30 to 80% by weight of an aromatic vinyl monomer component, 5 to 65% by weight of an N-substituted maleimide monomer component, and the amount of these monomers. 0 to 40% by weight of other vinyl monomer components copolymerizable with the polymer (however, the total amount of monomer components is 100% by weight).

Copolymer resin (C) consisting of ) (same hereinafter)
is a hard thermoplastic resin with excellent heat resistance because it contains an N-ffi-converted maleimide monomer component. *The copolymer resin (C) is added at the time of mixing the polyamide resin (A) and the rubber-reinforced styrene graft copolymer resin (B) to improve the dispersibility and miscibility of both. Improves properties such as impact resistance and mechanical strength.

Specific examples of the aromatic vinyl monomer component that is a component of the copolymer resin (C) include styrene, a-furkylstyrene such as a-methylstyrene, and nuclear-substituted alkylstyrene such as p-methylstyrene. , vinylnaphthalene, etc. These may be one kind or a mixture of two or more kinds.

The proportion of the aromatic vinyl monomer component in the resin (C) is in the range of 30 to 80% by weight. If you get out of this range, Tree 11! The properties of t(C) such as heat resistance and miscibility with other resins change, making it impossible to produce a resin composition with excellent physical properties.

The Nfi-converted mashimaleimide monomer component includes maleimide,
N-phenylmaleimide, N-(o-methyl)maleimide, N(+)-methylphenyl)maleimide, N-su7
Examples of the tilma include N-aromatic maleimide such as imide, N-alicyclic alkylmaleimide such as N-cyclohekynelumaleimide, and N-aliphatic alkylmaleimide having an alkyl group having 1 to 10 carbon atoms. These may be used alone or in a mixture of two or more. Among these, N
-The combined system of phenylmaleimide and maleimide is a resin (
C) is particularly preferred in terms of heat resistance and the like.

The proportion of the N-substituted maleimide monomer component in the resin (C) is in the range of 5 to 65% by weight. If it is outside this range, the heat resistance of the resulting resin composition and the miscibility between the resins will deteriorate, which is not preferable.

Specific examples of other vinyl monomers that can be copolymerized with the above-mentioned monomers include vinyl cyanide monomers such as acrylonitrile and methacrylonitrile, acrylic acid, methacrylic acid, itaconic acid, hexamaric acid, etc. carboxylic acid-containing vinyl monomers, or metal salts of alkali metals, alkaline earth metals, etc. of these carboxylic acid-containing vinyl monomers, alkyl groups having 1 to 10 carbon atoms, cycloaltyl groups, benzyl Examples include vinyl monomers containing carboxylic acid esters, such as acrylates, phenyl groups, etc., such as acrylates, tutacrylates, itaconates, heptamalates, and maleates, and α,β-unsaturated dicarboxylic acid anhydrides such as maleic anhydride. These may be used alone or in a mixture of two or more.

The proportion of other vinyl monomer components in the resin (C) is in the range of 0 to 40% by weight. If the amount exceeds 40% by weight, the physical properties of the resulting resin will change, making it impossible to obtain the desired resin composition. Among the other vinyl monomers exemplified in -E, α,β-unsaturated dicarbon a anhydride is particularly preferred, and its content ratio is from 0.01 to 30
Particularly preferred is a range of % by weight, within which α
, a copolymer resin (C) containing a β-unsaturated dicarboxylic acid anhydride component is prepared by dispersing the polyamide resin (A) and the rubber-reinforced styrene gelatin [combined resin (B)] with good miscibility, Resin compositions can be produced that provide extremely high impact resistance.

There are two methods for producing the copolymer tree J1t(C) described below, and either method may be used.

(1) Using the constituent components of the resin (C) as polymerization raw materials, 30 to 80% by weight of an aromatic vinyl monomer, 1% by weight of an N-substituted maleimide monomer of 5 to 65%, and a combination of these monomers. A method for producing a copolymer resin (C) having a desired composition by copolymerizing a monomer mixture consisting of 0 to 40% by weight of other polymerizable vinyl monomers.

(2) Among the constituent components of the resin (C), all or most of the N-substituted maleimide monomer component is replaced with a maleic anhydride component, and a monomer mixture consisting of this monomer component is copolymerized. Then, the obtained copolymer and ammonia,
Aliphatic 11th-class amines such as monoalkylhumine or monocyclofurkylamine having 1 to 10 carbon atoms, 7-niline,
A method of producing a copolymer resin (C) having a desired composition by subjecting one or a mixture of two or more aromatic primary amines such as toluidine to a polymer imidization reaction (for example, as disclosed in JP-A-Sho). 57-131213).

Regardless of the method (1) or (2) above, the specific operations include bulk polymerization, tf #liquid-liquid suspension polymerization, and /*take emulsion polymerization. It can be either a batch method or a continuous method. The polymerization methods and methods described above can be combined as appropriate. In addition, as a treatment method after finishing the copolymerization operation, known extraction, precipitation, distillation, flocculation, furnace separation,
Various types of bare cropping such as washing, drying, and pelletizing can be used in combination as appropriate. A copolymer can be obtained by such post-treatment. The copolymer resin (C) may be one obtained by this manufacturing method (1) or (2), either alone or in combination.

The copolymer resin (D) constituting the composition of the present invention includes 60 to 90% by weight of an aromatic vinyl monomer component, 0 to 40% by weight of a vinyl cyanide monomer component, and 0 to 40% by weight of a methyl methacrylate component. % by weight of thermoplastic resin.

The aromatic vinyl monomer and vinyl cyanide monomer, which are the constituent components of the copolymer resin (D), are the vinyl monomers listed as the components of the copolymer resin (C). It is synonymous with body. The proportions of the components constituting the copolymer resin (D) are as described above, and if it deviates from this range, the characteristics of the copolymerized resin will change, and the miscibility with other resins to be mixed will become poor. This is not preferred because it reduces the heat resistance or impact resistance of the resin composition.

The polymerization method and polymerization conditions for the copolymer resin (D) are, for example, emulsion polymerization method, suspension polymerization method, solution polymerization method, according to the known manufacturing technology of 7-crylonitrile-styrene copolymer (As resin),・Methods such as bulk polymerization can be appropriately selected from batch or continuous methods.

In addition, this copolymer resin (D) is produced simultaneously in the same polymerization system during the polymerization operation of the rubber-reinforced styrene-based graft copolymer resin (B) and/or copolymer resin (C). Alternatively, the polymerization method and polymerization conditions can be set separately for production.

The resin composition according to the present invention includes 100 parts by weight of a resin mixture consisting of the polyamide resin (A) and rubber-reinforced styrene-based graft copolymer resin (B) as described above, and 0.01 parts by weight of the copolymer resin (C). ~40 parts by weight and 0 to 15 parts by weight of the copolymer resin (D) are weighed and mixed.

The mixed compound may be left as a triblend, but it is more preferable to further melt-mix it by subjecting it to a melt-kneading step.
If the amount of each resin exceeds the above range, the desired heat resistance and impact resistance will not be obtained, and a thermoplastic resin composition with good processability will not be obtained. In order to blend, mix and knead the constituent components of the resin composition of the invention, known mixing and cross-mixing methods may be used.

For example, one or a mixture of two or more of these resins in the form of powder, beads, seven lakes, or pellets can be processed using an extruder such as a Tsumugi extruder, a two-wheeled extruder, or a Banbury mixer. With a kneading machine such as this roll,
The process ends with forming a resin composition. In some cases, it is also possible to adopt a method in which one or more of these polymerized resins are mixed in an undried state, precipitated, washed, dried, and kneaded.

Regarding the order of this mixing and cross-wiring, three or four types of component resins may be mixed and kneaded at the same time, or first, one or more of the component resins are mixed and cross-crossed, and then separately 1!
Alternatively, the desired resin composition may be obtained by kneading two or more kinds together and kneading them later.

In addition, if volatile components remain in the resin composition, physical properties such as heat resistance may deteriorate, so when mixing and kneading using an extruder, be sure to perform the kneading operation while forcibly devolatilizing the resin composition. The resin composition thus obtained is used for molding, etc., either as it is or after being dried.

The resin composition according to the present invention contains lubricants, mold release agents, colorants, antistatic agents, flame retardants, ultraviolet absorbers, light resistance stabilizers, heat resistance stabilizers, and lubricants of type 11 and amounts that do not impair the properties of the resin. Each of the 191 resin additives such as a stability stabilizer, a filler, a nucleating agent, etc. can be added in an appropriate combination. Fillers include plus fibers, metal fibers, carbon fibers, fibrous reinforcing agents such as potassium titanate whiskers, talc, clay, calcium carbonate, mica, Las 7 Lake, Milled 7T Iper, Metal 7 Lake, metal powder, etc. These alone can be listed as 21! A combination of II and I can also be blended.

The resin composition according to the present invention can be produced by injection molding method, extrusion molding method,
By various processing methods such as compression molding, it can be made into molded products such as automobile parts, electrical parts, industrial parts, etc., and used in applications requiring excellent heat resistance and impact resistance.

"Effects of the Invention" The present invention is as explained above, and has particularly remarkable effects as follows, and its industrial use (1) The tatmt composition according to the present invention is made of polyamide resin (A). and rubber-reinforced styrenic graft copolymer resin (B) with N.
-Copolymer resin (C) containing a substituted maleimide monomer component
By blending 1), surprisingly, it can be used as a thermoplastic resin material with extremely high impact resistance that was previously unforeseen, especially excellent notched impact strength. .

(2) Since the resin composition according to the present invention contains a copolymer resin (C) containing an N-substituted maleimide monomer component, it exhibits good miscibility and excellent heat resistance and mechanical properties. A molded product with strength can be obtained.

(3) Since the resin composition according to the present invention is formulated with each resin optimized, a molded product with low moisture absorption and excellent chemical resistance, which combines the characteristics of each resin, can be obtained. It will be done.

(4) The resin composition according to the present invention has excellent resin molding processability because each resin is blended in an optimized manner.

(5) Since the resin composition according to the present invention has excellent miscibility with other materials, for example, by mixing and kneading it with glass fiber etc. to form a composite, the resin composition has excellent plus fiber reinforcement such as heat resistance and rigidity. It can be made into a resin composition.

"Examples" Next, the present invention will be specifically described based on Examples, but the present invention is not limited to the following Examples unless the scope thereof is exceeded.

In the following examples, "r parts" represents "parts by weight."

Production example (1) Rubber reinforced styrenic graft copolymer resin (B)
Monomer mixture (1 ) was prepared.

Styrene, butadiene,
Rubber latex (St containing txom@%, rubber solid content concentration 3711%, rubber average particle size 0.30 μm) 270
(including water) and 100 parts of deionized water were charged, and the internal temperature was raised to 70°C while stirring under a nitrogen stream. 0.01 parts of ferrous sulfate dissolved in a small amount of deionized water,
0.8 part of dextrose and 1 part of sodium pyrophosphate were added to the polymerization system.

Next, 25 parts of an aqueous dispersion of chunone hydroperoxide (hereinafter abbreviated as CHPO) (ctipo*tb,' of o, ss) was added to 180 molecules 1 in this 7 lasco,
The entire amount of monomer mixture (1) was added continuously for 140 minutes, and the polymerization reaction was started at the same temperature. 120 minutes after the start of the polymerization reaction, 0.2 parts of sodium dodecylbenzenesulfonate was added. After starting the polymerization, the graft polymerization reaction was continued at the same temperature for 210 minutes.

The latex obtained after completing the graft polymerization reaction was
It was added dropwise to a 4% aqueous magnesium sulfate solution heated to 5°C for salting out, dehydrated, and dried to obtain a powdered styrene-based graft copolymer resin (B) (graft del content: 70% by weight). .

(2) Production of copolymer resin (C)-1 690 parts of 5t and 19 parts of maleic anhydride were charged into a pressure-resistant polymerization tank equipped with a cooler, a stirring device, and a raw material auxiliary supply device, and the interior of the polymerization tank was filled with nitrogen gas. Replaced with. While stirring, the temperature inside the polymerization tank was raised to 95° C., and a polymerization reaction was started in the form of a block. 100 parts of the maleic anhydride melt heated to 70°C was continuously added at a constant rate into the polymerization system at 95°C for 460 minutes after starting the polymerization. After 460 minutes, a viscous liquid with a polymerization rate of 44% by weight was obtained.

This viscous liquid was poured into a large excess of methanol to remove unreacted monomers and dried to obtain a styrene/maleic anhydride copolymer. 300 parts of the obtained styrene/maleic anhydride copolymer and 600 parts of xylene were charged into an autoclave equipped with a stirring device and a raw material auxiliary supply device,
The inside of the reaction system was replaced with nitrogen gas while stirring. The temperature of the reaction system, which had become a homogeneous solution, was raised to 155° C., and 93 parts of 7-niline and 0.9 parts of triethylamine were added to the autoclave to start a polymer imidization reaction.

The polymer imidization reaction was continued at the same temperature for 240 minutes from the start of the reaction. The obtained polymer solution was poured into methanol, followed by precipitation, washing, filtration, and drying to obtain copolymer resin (C)-1.

The composition of the obtained copolymer t#fffl(C)-1 according to the NMR analysis results is 57.6% by weight of styrene component, N-
The phenylmaleimide component was 41.6% by weight and the maleic anhydride component was 0.8% by weight.

(3) Production of mixture of copolymer resin (C)-If and copolymer resin (D) Cooler, stirring device! 5t690WS and 19 parts of maleic anhydride were charged into a pressure-resistant polymerization tank equipped with a raw material auxiliary supply device, and the inside of the polymerization system was replaced with nitrogen gas. While stirring, the temperature inside the polymerization tank was raised to 95° C., and a polymerization reaction was started in the form of a block. 100 parts of the maleic anhydride melt heated to 70°C was continuously added to the polymerization system at 95°C at a constant rate for 460 minutes after starting the polymerization. 460 minutes after starting the polymerization. Afterwards, a viscous liquid with a polymerization rate of 44% by weight was obtained.

To this polymerization system, 210 parts of AN was continuously added for 460 to 480 minutes after the start of polymerization.The temperature of the 6-polymerization system was lowered from 95℃ to 90℃, and polymerization was continued in bulk for 20 minutes. continued to react.

Almost all the maleic anhydride in the unreacted monomer disappears,
It was threatened by a polymerization reaction.

To this polymerization system, 0.03 parts of a poval suspension stabilizer and 0.03 parts of an acrylic acid/octyl 7 acrylate copolymer suspension stabilizer.
By adding 700 parts of an aqueous solution in which 3 parts of 0.03 and 2 parts of di-t-butyl peroxide were added, the polymerization system was changed from a bulk polymerization system to a suspension polymerization system. This suspension polymerization system was heated to 110°C.
The unreacted monomers were removed by stripping at the same temperature for 120 minutes. Then, 80 parts of AN was added,
Raise the temperature of the suspension system from 110°C to 150°C in 60 minutes! ! ! While maintaining the temperature of the turbid system at 150℃,
Stripping was performed again for 120 minutes.

After this stripping, the suspension system was heated to 155°C, 90 parts of aniline and 10 parts of 25% by weight aqueous ammonia were added, and the suspension system was stirred at the same temperature for 120 minutes. A chemical reaction was carried out. The suspension system was cooled, separated in a furnace, washed with water, and dried to obtain a bead-like copolymer. - The beaded copolymer was pelletized using a screw extruder.

As a result of analyzing this pellet, styrene 1 & min 58.8
copolymer resin (C)-It consisting of i1fi%, N-phenylmaleimide component 38.2% by weight, maleimide component 1.4% by weight and maleic anhydride component 1.6% by weight, and styrene component 73.8% by weight. It is a mixture of copolymer resin (D) consisting of 26.2% by weight of copolymer resin (C)-7 and 26.2% by weight of crylonitrile components, and its composition is 1176% by weight of copolymer resin (C)-1 and 24% by weight of copolymer resin (D). Met.

Examples 1 to 7, Comparative Examples 1 to 3 Nylon 6 (NOVA) was used as the polyamide resin (A).
MID・1020, Mitsubishi Chemical Industries, Ltd.! Rubber-reinforced styrenic graft copolymer resin (B), copolymer resin (C) and copolymer resin (D) obtained by the method described in the above production example are listed in Table 1. The components were weighed in the proportions (parts) and mixed in a tumbler, and the resulting mixture was kneaded using a vented uniaxial extrusion rock while removing volatile matter to create pellets of the resin composition. .

Test pieces for measuring physical properties were molded from pellets of this resin composition by injection molding. For the molded specimen, t
Tensile strength, Izot impact strength (notched), deflection temperature under load, and melt 70-rate were measured in an absolutely dry state by the methods described in Table tS1. The results are shown in Table 1.

[Note 1 Book 1: Measured in accordance with JIS K 7113.

Book 2: JIS K 7110 (Noft size) 1
Measured in accordance with this.

Kyo3: Measured according to JIS K 7207 A method (no annealing).

Book 4: JIS K 7210 B method (load 1
0kgF, temperature 260℃).

From Table 1, the following becomes clear.

(1) Since the resin composition according to the present invention contains an appropriate amount of copolymer resin (C), it has an extremely high Izo impact strength (notched) that could not have been predicted until now. (See Examples 1 to 7).

On the other hand, those containing no copolymer resin (C) at all (see Comparative Example 1) and those containing it in excess (see Comparative Example 2) have low Izod impact strength.

(2) Since the resin composition according to the present invention contains appropriate amounts of each resin, it has excellent mechanical strength and heat resistance as shown in tensile strength, isot impact strength, deflection temperature under load, and melt 70-rate. and excellent balance of moldability (see Examples 1 to 7).

In addition, resin compositions obtained outside the scope of the present invention have the disadvantage that the balance between them is poor and at least one of the physical properties is poor (see Comparative Examples 1 to 3).

Claims (3)

[Claims] (1) Polyamide resin (A) 20-80% by weight and rubber reinforced styrene graft copolymer resin (B) 20-8%
100 parts by weight of a resin mixture consisting of 0% by weight, 30 to 80% by weight of an aromatic vinyl monomer component, 5 to 65% by weight of an N-substituted maleimide monomer component, and other components copolymerizable with these monomers. Vinyl monomer component 0 to 40% by weight (however, the total monomer component is 100% by weight).
0.01-40 parts by weight of a copolymer resin (C), and 60-90% by weight of an aromatic vinyl monomer component, 0-40% by weight of a vinyl cyanide monomer component, and 0-40% by weight of a methyl methacrylate component. 40% by weight (however, the total monomer component is 1
00% by weight. ) copolymer resin (D) 0~
15 parts by weight of an impact-resistant thermoplastic resin composition. (2) Rubber reinforced styrene graft copolymer resin (B)
The average particle diameter of the graft rubber derived from
The impact resistance according to claim (1), wherein the graft gel content in the resin (B) is 10 to 90% by weight based on the entire resin (B). Thermoplastic resin composition. (3) A part of the other vinyl monomer components constituting the copolymer resin (C) is an α,β-unsaturated dicarboxylic acid anhydride component, and the α,β-unsaturated dicarboxylic acid anhydride component According to any one of Claims (1) or (2), the resin (C) contains an acid anhydride component in an amount of at least 0.01 to 30% by weight. The impact resistant thermoplastic resin composition described.