JPS61264041A - Heat-resistant, impact resistant resin composition - Google Patents

Abstract

PURPOSE:A composition having improved impact resistance, slightly causing thermal decomposition and heat coloring during molding and processing, comprising a composition consisting of a specific thermoplastic resin and a specific rubber reinforced resin. CONSTITUTION:(A) A thermoplastic resin is blended with (B) a rubber reinforced resin obtained by grafting a nitrile monomer or an aromatic vinyl monomer onto elastomer having <=0 deg.C glass transition temperature in a blend ratio of the component A/B=5/95-95/5. When the thermoplastic resin A is obtained by subjecting 50-80wt% aromatic vinyl, 10-30% vinyl cyanide and 5-40wt% maleimide monomer shown by the formula (R is H, 1-4C alkyl, cyclohexyl, or aryl) to emulsion polymerization, >=30wt% aromatic vinyl is fed to a reaction system before the starting of polymerization. When the three components are left, the residue is added to the reaction system, the pH of the aqueous phase at the beginning of the polymerization is kept at 3-9 and the polymerization is carried out by a redox catalyst using an oil-soluble organic peroxide.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application] The present invention relates to a thermoplastic resin having excellent heat resistance, thermal decomposition resistance, and impact resistance.

The demand for heat resistance for automotive materials has increased in recent years, and is now required for interior parts such as V, meter hoods, meter clusters, instrument panels, and console boxes, as well as exterior parts such as pan bars, exterior panel materials, and lamp housings. There is a need for a material that has high heat resistance, easy moldability, and does not undergo thermal decomposition or thermal discoloration. The thermoplastic resin composition of the present invention is primarily intended for use in such fields.

[Conventional technology] Conventionally, heat resistance'! Heat-resistant ABS for demanding parts
, polyphenylene ether modified resin, polycarbonate resin, etc. have been used.

Heat-resistant ABS is manufactured by the so-called graft blending method of graft AB8, which is a diene rubber that is graft-polymerized with acrylonitrile and styrene and/or α-methylstyrene, and a resin that is a copolymerization of acrylonitrile, styrene, and α-methylstyrene. Currently, the heat resistance of the resulting heat-resistant ABS is not satisfactory because the heat resistance of the co-X combination of acrylonitrile and styrene and/or α-methylstyrene used is not sufficiently high. It should be noted that a resin with high heat resistance can be obtained by increasing the α-methylstyrene content in such a copolymer; , the polymerization rate is slow, and therefore a resin with a high degree of unity cannot be obtained, and α
It also has the disadvantage of being easily thermally decomposed during processing because it forms a structure with connected methylstyrene chains.

10,000, polyphenylene ether modified resin, polycarbonate, and their modified products are generally expensive.
However, it is also inferior in terms of moldability, so it is cheap and
There is great hope for the development of thermoplastic resin compositions that are resistant to thermal decomposition, easy to mold, and have sufficient heat resistance.

[Intersection point to be solved by the invention] The present invention provides a material that has good heat resistance and is resistant to thermal decomposition and thermal discoloration during molding. It is intended to provide this by using a maleimide-based co-M compound obtained by a specific emulsion polymerization method.

It has already been shown that maleimide monomers of the formula (Al) can easily be co-formed with vinyl monomers such as styrene, acrylonitrile, and methyl methacrylate (M@[2) to form highly heat-resistant, extremely loose and ugly polymers. It is publicly known.

Solution polymerization 1. Examples include carbon polymerization, suspension polymerization, and emulsion polymerization.
! The r method is common.

In addition, from the viewpoint of moldability, impact resistance, and heat resistance, aromatic vinyl monomers, vinyl cyanide monomers, etc. and the formula (
It is possible to obtain good results using a 2-day-old copolymer.

However, when attempting to produce a copolymer with high heat resistance that does not decompose or discolor due to heat using aromatic vinyl, vinyl cyanide, and maleimide monomers in the emulsion polymerization method, it is necessary to simply If the mixture is charged into the polymerization system all at once to start polymerization, only a copolymer with a low polymerization yield, low heat resistance, and poor impact strength development can be obtained. The reason for this is that a charge transfer complex is formed between the maleimide monomer and the aromatic vinyl, and because the charge transfer complex has high polymerizability, the complex polymerizes preferentially in the early stage of polymerization, resulting in changes in composition distribution and molecular weight. This is thought to be due to the formation of a single coalescence with a wide distribution.

In addition, if the entire mixture of aromatic vinyl, vinyl cyanide, and maleimide monomers is continuously added to the polymerization system, the polymerization yield will be low and the polymer will have poor thermal decomposability and heat resistance. I can only get it.

Therefore, we have conducted intensive studies on emulsion polymerization formulations that have high polymerization yields, excellent polymerization stability, and low thermal decomposition properties of the resulting polymers, and as a result, we have arrived at the present invention.

[Means for Solving the Problems] The present invention consists of 50 to 80% by weight of aromatic vinyl, 10 to 50% by weight of vinyl cyanide, and 5 to 401 maleimide monomers represented by the formula (N). Emulsion Ii on the monomer mixture of
When combining, the total amount of wholly aromatic vinyl or its 5OIs
If vinyl cyanide, the maleimide monomer of formula (A), and aromatic vinyl remain in the system after the above is charged into the polymerization system before the start of the polymerization, they may be added continuously or in portions to the remainder. In the method of polymerization, the pH of the aqueous phase at the start of polymerization is maintained between 9f5 and 90, and the thermoplastic resin (1) is obtained by polymerizing with a redox catalyst using an oil-soluble organic peroxide. A rubber-reinforced resin (It) obtained by graft polymerizing an elastomer having a glass transition temperature of 0° C. or lower with at least one compound selected from a nitrile cap, an aromatic vinyl polymer, and an acrylic monomer. 'k
(1) A heat-resistant and impact-resistant resin composition in which 0 to 300 parts of a thermoplastic resin that is hard at room temperature is blended with 100 parts of a thermoplastic resin composition in which the ratio of / (It) is in the range of 5795 to 9515. It is related to.

As can be understood from the above, the hard thermoplastic resin may not be used at all, but when it is used, the proportion thereof is up to 300 parts.

(A) (In the formula, R represents hydrogen, an alkyl group of 01 to 04, a cyclohexyl group, an aryl group, or a substituted aryl group.) In the present invention, the content of aromatic vinyl is 50 to 80.
It is necessary to fall within the range of If the content is less than 50% by weight, the processability of the resulting composite will decrease,
In addition, the impact strength development property decreased, and conversely, the content was 801%.
When the amount is exceeded, the amount of maleimide monomer that can be used decreases, and only the 1@-monomer with low heat resistance is obtained. Further, the content of vinyl cyanide must be in the range of 10 to 50 parts by weight. If the content is less than 75 to 101 L, the processability and impact strength development will deteriorate, and if it is more than 40 weight, only a polymer that is easily discolored by heat during processing will be obtained.

The content of maleimide monomer represented by the formula (N is 5 to 4
It is necessary to fall within the range of 0 weight and 11%.

If n is less than 5% by weight, the resulting polymer will have low heat resistance, and if it is more than 40% by weight, the polymer will have poor impact resistance and cannot be obtained.

The amount of aromatic vinyl added before the start of polymerization must account for 60 or more of the total aromatic vinyl used. That is, if the amount of aromatic vinyl added before the start of polymerization is less than 30 times the total aromatic vinyl used, the polymerization yield will be low and the resulting polymer will have low heat resistance.

In addition, before the start of weight loading, the entire amount or part of the aromatic vinyl is charged, and the vinyl cyanide, the maleimide monomer, and if necessary, the remaining aromatic vinyl is added continuously or in portions. In the case of polymerization, it is possible to add vinyl cyanide, maleimide monomer and, in some cases, the remaining aromatic vinyl separately, but vinyl cyanide,
It is preferable to add the maleimide monomer and the remaining aromatic vinyl as a mixed solution. Further, a mixed solution of 70 to 95 weight of the total vinyl cyanide, the total amount of maleimide monomer, and the remainder of the aromatic vinyl is added and polymerized, and the remaining vinyl cyanide is then continuously or It is more preferable to polymerize by dividing or adding at once.

In the present invention, the total pH of the aqueous phase at the start of polymerization is 3 to 90.
◎Maleimide monomers are susceptible to hydrolysis in aqueous solutions with a pH of 9 or higher, and as a result, the polymerization ratio decreases and the stability of the polymerization system decreases. If it is less than 5, the surface activity of the emulsifier decreases, resulting in a decrease in the polymerization ratio, which is not preferable.

Furthermore, as the aromatic vinyl monomer in the present invention, it is possible to use one of monomers such as styrene, α-methylstyrene, paramethylstyrene, t-butylstyrene, chlorostyrene, vinyltoluene, etc., or a mixture thereof. It is. Acrylonitrile as vinyl cyanide polymer,
It is possible to use one type or a mixture of monomers such as methacrylonitrile and fumaronitrile.

Examples of the maleimide monomer used in the present invention include maleimide, N-methylmaleimide, N-ethylmaleimide, y-propylmaleimide, N-isopropylmaleimide, N-cyclohexylmaleimide, N-phenylmaleimide, N-toluylmaleimide, Examples include y-xylylmaleimide, N-naphthylmaleimide, and Nt-butylmaleimide, with N-phenylmaleimide being preferred.

Examples of the emulsifier used in the present invention include alkali metal salts of dodecylbenzenesulfonic acid, alkali metal salts of alkyldiphenyl ether disulfonic acid, alkali metal salts of alkylnaphthalene sulfonic acid, alkali metal salts of lauryl sulfate, and sarcosinates having a pH range of 5 to 9. Anionic emulsifiers having emulsifying activity are preferred. It is also possible to use these emulsifiers in combination.

As the polymerization initiator, a redox system using an oil-soluble organic peroxide is used, but an oil-soluble organic peroxide and ferrous sulfate-chelating agent-reducing system is particularly preferred. When water-soluble initiators such as persulfates are used, the polymerization rate is slow;
The productivity is poor, and the resulting polymer has poor thermal colorability and thermal decomposition resistance.

As the oil-soluble heavy initiator, organic peroxides such as cumene hydroperoxide, diisopropylbenzene hydroperoxide, and tert-butyl hydroperoxide are preferred. As the reducing agent, sodium salt of formaldehyde sulfoxylate, glucose, sodium ascorbate, etc. are used, and ferrous sulfate and chelate compounds such as sodium birophosphate, sodium ethylenediaminetetraacetate, etc. are used in combination. Particularly desirable.

When the thermoplastic resin obtained in this way is used in Germany, it may have a poor taste and may have a slightly low impact strength. For the purpose of improving its insufficient impact resistance, it is very effective to blend it with a rubber-reinforced resin. Furthermore, in addition to rubber-reinforced resin, it is also effective to use polycarbonate resin or PBT resin in combination for the purpose of further increasing the impact strength. or,
For the purpose of improving processability, it is also effective to use As resin and all of the AN-αMS heptadons together.

The elastomer in the rubber-reinforced resin blended in this way has a glass transition temperature of 0° C. or lower, and specific examples include the following.

A diene elastomer whose main component is polybutadiene or butadiene, and which is copolymerized with at least one monomer selected from the group consisting of acrylonitrile, styrene, methyl methacrylate, and an acrylic ester having an alkyl radical having 1 to 8 carbon atoms. An acrylic elastomer iE whose main component is an acrylic acid ester having an alkyl radical having 1 to 8 carbon atoms, and which is further enriched with at least 1 fli of monomers such as acrylonitrile, styrene, methyl methacrylate, etc. P-lover! 1nPDM rubber: zircon rubber.

Monomers to be graft-polymerized to the above elastomer include nitrile monomers such as acrylonitrile, methacrylaterile, and fumaronitrile, and styrene, α-methylstyrene, paramethylstyrene, t-butylstyrene, vinyltoluene, chlormethylene, bromostyrene, etc. It is preferable to use at least 121K of aromatic monomers and acrylic monomers such as methyl methacrylate, alkyl methacrylate, and alkyl acrylate.

The elastomers mentioned above are graft-polymerized with monomers selected from the above-mentioned monomer groups and sold on the market: 5BS resin (118 elastomers for AN-Bd-St), MBS
Resin, AA8 resin (AN-acrylic rubber-styrene copolymer), 5S resin (MuN-KPDM-8t), etc. can be mentioned.

Grafting of monomers onto the above elastomer] [Methods for grafting include emulsion polymerization, bulk polymerization, suspension polymerization, solution polymerization, emulsion suspension polymerization, and emulsion bulk 1 method.

As thermoplastic resins that are hard at room temperature, some of the above L7j
As, As resin (tAn-st), MMA resin, Me resin (MMmu5ty), αsAN resin (AN-αMS)
, PO (polycarbonate), quality PPO/maleic anhydride-St resin, maleic anhydride-mu N-8t, PBT
, FA, etc. It is also possible to use these resins in combination.

The composition ratio of thermoplastic resin and rubber reinforced resin is from 5/95
A range of 9515 is appropriate. The ratio of rubber reinforced resin is 5
If it is less than 95%, the impact strength of the resulting composition will be low and may not be satisfactory; on the other hand, if it is more than 95%, the heat resistance of the resulting composition will not be the same.

Also, the amount of hard thermoplastic resin added to the above-mentioned mixture of thermoplastic resin and rubber reinforced resin is the total of the thermoplastic resin and rubber reinforced resin! Suitably, the amount is in the range of 0 to 500 parts per 100 parts by weight. If more than 300 parts are distributed, the proportion of thermoplastic resin or rubber-reinforced resin will be low, and the same heat resistance and impact strength cannot be expected.

In addition, a hindered phenol antioxidant, a phosphite stabilizer, gold, etc. are added to the above composition for the purpose of improving thermal stability.
Benzophenone-based UV absorbers and hindered amine-based stabilizers, benzo) IJ azole-based UV absorbers for the purpose of improving weatherability purple? For the purpose of improving workability, it is also possible to use amide lubricants such as ethylene bisstearylamide, metal soap, etc., either alone or in combination. The composition of the present invention can also be used as a flame-retardant resin by adding all the flame retardants and other ingredients to the composition.

The thermoplastic resin composition obtained by the present invention can be used in many fields such as injection molding, extrusion molding, wall molding, etc. It can be used in the RFFI processing field. Furthermore, it is also possible to perform bright treatments such as plating, 9-evaporation, and sputtering.

Hereinafter, the entire history of the present invention will be specifically explained using examples.

Example] Production of graft polymer (1): The following charge composition was charged to all reactors.

Polybutadiene latex (as solid content) 60 parts Pure water 140 Dextrose [L6 #Pyrophosphate α5 #Ferrous sulfate
0.002# Potassium rosinate
1.0〃The temperature of the charged composition was raised to 60°C, and a mixed solution of 12 parts of acrylonitrile (N), 12 parts of styrene (BT'12B, 112 parts of cumene hydroperoxide, and 0.5 parts of tertiary dodecyl mercaptan) was continuously added. After 7 hours of dropping for 120 minutes,
It was further aged for 120 minutes at a temperature of 60°C to complete the M attachment. 15 parts of 2,6-ditertiarybutyl P-cresol (BHji) was added to the obtained rt latex, and after thorough mixing, it was coagulated with dilute sulfuric acid, dehydrated, and dried to obtain a white powder. All "parts" in the examples refer to parts by weight, and the same applies below.) Production of graft polymer (U); The following composition was charged into a reactor.

yt' IJ 7'Tadiene (as solid content) 45
Pure water 140# Dextrose 06 Sodium birophosphate α3N ferrous sulfate
0.002# Potassium rosinate
1.0 parts acrylonitrile &
4# Styrene 19.61 Charged Composition The temperature was raised to 60°C, all three parts of cumenohydrobar oxide α were charged, and electricity was started. After polymerizing for 70 minutes, as a second stage, a mixed solution of 1 part of acrylonitrile, 9 parts of α-methylstyrene 1a, and 2 parts of cumene hydroperoxide α was entangled over 1 hour and polymerized. The obtained graft polymer latex was coagulated with dilute sulfuric acid, dehydrated, and dried to obtain a white powder. 90 Production of graft polymer surface; 60 parts of polybutadiene latex (solid content equivalent, average particle size αSOμ, gel content 80 H, gel swelling degree 25), water 1
40 parts, potassium oleate 2 parts, ferrous sulfate ctoo
x part, 15 parts of sodium pyrophosphate α, 1 part of dextrose.
0 parts were charged to the reactor. The temperature was raised to 60°C with stirring, and
While maintaining the temperature at 0°C, a mixture of 16 parts of styrene, 24 parts of methyl methacrylate, 0.2 parts of cumene hydroperoxide, and 3 parts of t-dodecylmercaptan α was continuously added over 3 hours to a solution. I gave it weight. Next, the temperature of the yarn was raised to 70° C., and the mixture was further combined for 1 hour to obtain a graft polymer latex. The obtained nfC-latex was coagulated with dilute sulfuric acid, dehydrated and dried to obtain a white powder.

As other rubber reinforcing resins to be blended with the maleimide-based 1L combination, the following resin pellets were used as they were.

Muhe 8 resin (1): Dia rack ■AΦ700 (manufactured by Mitsubishi Rayon) Mu AS
Resin (■): Pitax ViS101 (manufactured by Hitachi Chemical) AFltS resin: J 5RAfl18su110 (manufactured by Japan Synthetic Rubber) Production of maleimide copolymer (1): 201 glass reactor (with stirrer, condenser, thermometer) ) was sufficiently replaced with nitrogen, the following substances were charged (
(Site composition before polymerization) Pure water 150 parts Sodium dodecylbenzenesulfonate 2 parts Sodium sulfate α21 Ethylenediamine 4
Vinegar WR2 Soda [(FtDTA-2Na) α01 l Ferrous sulfate-7hydrate (Fe804 ・7H20) α0
02N Rongalito a5 1 preparation! The ingredients were thoroughly stirred and mixed, and the pH was measured to be a6. Next, 70 parts of α-methylstyrene was added, and after thorough mixing, the temperature was raised to 70°C. Polymerization was initiated by dropping the following substances into the reaction system at 70°C over 150 minutes (@lower monomer 1) Acrylonitrile 10 parts N-phenylmaleimide 15 l Cumene hydroperoxide α51-dodecyl mercaptan (L1 #1 part After the addition of the monomer (1) was completed, 5 parts of acrylic nitrile was continuously added dropwise as the monomer (2).After the addition was completed, the temperature of the reaction system was raised to 80°C, and then Cumenoid donkey
All 1 part of oxide [L was added, and polymerization was continued at 80°C for 2 hours. After completion of polymerization, the pH of the system was 40 and 7t.

The yield of the latex obtained was 94 cm.

The latex was coagulated with ts% magnesium sulfate at a temperature of 90° C. or higher, dehydrated, washed with water, dehydrated, and dried to obtain a white powder.

Production of maleimide copolymer (U): In the method for producing maleimide copolymer (1), as shown in Table 1, the composition of the dropped monomer (1) is changed to 15 parts of acrylonitrile and 10 parts of N-phenylmaleimide. Production of maleimide copolymer The amount of α-methylstyrene was changed from 170 parts to 50 parts, and 10 parts of acrylonitrile and 15 parts of dophenylmaleimide were added as monomers (1) to a solution in which 40 parts of α-methylmethylref was added to 10 parts of acrylonitrile and 15 parts of H-phenylmaleimide. Polymerization was carried out in exactly the same manner as in the maleimide copolymer except for the following changes.
It solidified to give a white powder.

Production of maleimide-based copolymer (1): In the method for producing maleimide-based copolymer (1), as shown in Table 1, α-methylstyrene is added to the reactor before the start of polymerization, and acrylonitrile as the monomer (2) added dropwise. was added to the monomer (1), and the entire amount of the monomer was added dropwise to the polymerization system and polymerized to produce a 7ta maleimide copolymer (to): In the production of the maleimide copolymer (1), as shown in Table 1. , onto the acrylonitrile' of the top knob (2).
Production of maleimide copolymer (M) was carried out in the same manner as in the production of maleimide copolymer (1), except that monomer (1) was added to the monomer (1). I prepared the substance.

Pure water 200 parts Sodium dodecylbenzenesulfonate 2.01 Potassium persulfate 05 parts Acidic sodium sulfite
1.0 Preparation Composition After thorough stirring and mixing, 70 parts of α-methylstyrene was added, and after stirring for 40 minutes, the temperature was raised to 70°C. When the temperature of the system reaches 70℃, the following substances are mixed together for 150 minutes to form maleimide co-X (1)
11 L@ was started by dropping all of the same monomer (1) as in the case of manufacturing in '.

After the upper dripping knob (1) has finished dripping, turn the upper dripping knob
As (2), 5 parts of acrylonitrile was then continuously added dropwise. After the dropwise addition, 1 part of potassium persulfate α was added, the temperature was raised to 80°C, and the polymerization was further carried out for 2 hours to obtain 7tn, which was then rolled into latex 1! It was coagulated with 5% magnesium sulfate at a temperature of 90°C or higher, dehydrated, washed with water, and dried to obtain a white powder.

All of the following hard thermoplastic resins were used for blending.

(kBm fat c acrylonitrile-styrene copolymer): Produced by a suspension polymerization method using an As resin method using 30 parts of acrylonitrile and 70 parts of styrene. Obtained 7'L 7j
The A8 resin had an acrylonitrile content of 27% and a specific viscosity η8p10 of α6.

αBAN resin (acrylonitrile-αmethylstyrene copolymer): Acrylonitrile content is 201 η p10 (15 αSAM resin) Polycarbonate resin made by emulsion polymerization method: Tubarex 7022PJi made by Mitsubishi Kasei as pellets used.

The nyc maleimide copolymers (1, Il, Ill and ■) obtained according to the method of the present invention have high polymerization yields and I
The amount of coagulated material generated after L polymerization was also small, and good results were obtained. -Maleimide copolymer (GV) is a system in which the entire monomer is added continuously, but the polymerization yield is low and there is a lot of coagulation after polymerization, making it unsuitable for factory physiology. I can see that it's hard. - 10,000, maleimide copolymer with pH 1f5 at the start of polymerization and potassium persulfate as initiator (
In the case of (b), the polymerization yield is low and the coagulated material is also coarse.

Examples 1-15. Comparative Examples 1 to 9 Graft polymer (I), graph) 11 mass ■), graft polymer (g), graft monomer ω and maleimide polymers (1) to (b), As resin, α13AM resin, polycarbonate Resins were blended as shown in Tables 2 to 4, and as stabilizers, α2 parts of a phenolic antioxidant (Antage W-400 manufactured by Kawaguchi Chemical Co., Ltd.) and α4 parts of a phosphite stabilizer (manufactured by Mark O Adeca Argus Co., Ltd.) were added. , after mixing well,
It was pelletized at 260° C. using a 50 mφ twin-screw extruder. Obtained tl, 7j beretsu's q! R type mechanical properties are shown in 11.

All 1 oz injection molding machine (EIAV-3OA"l made by Yamaguchi Seiki) was used to mold the pellets at 290°C, 50 x 80 x 31
The molded product was molded into a flat plate of 11I, and the thermal decomposition property was evaluated by observing cylindrical streaks on the surface of the molded product.

The physical properties of the obtained pellets were evaluated according to the following method.

Izod impact value ASTM D-256℃ unit gg
cm/cm) 1/4 bar notched melt flow [ASTM D-1238 (unit: t/10 min) 23
0°X5Klil load Vicat softening temperature So R
-30/i (unit: °C) Load 11 [5 kg Pyrolyzability: 1 oz. A plate of 50 x 80 x 3 m/m was molded using an injection molding machine, and from the number of cylindrical streaks (-streaks) generated on its surface, it was determined as follows: I judged it.

○ No silver streak Δ N 1 to 10 pieces x 〃 10 or more pieces Very large number As shown in Examples 1 to 5, the blend of the graft polymer (Graftom BS) and the maleimide-based co'M polymer was used as a comparative example. The heat resistance (Vicat softening temperature) is dramatically higher than that of the blend with As resin of No. 5 and the blend of αRAN resin of Comparative Example 6.

The graft polymer (II) in which α-methylstyrene was used in combination with the graft monomer in Example 4.5 had a significantly higher impact strength than the case in which the graft polymer (1)'Ik in Examples 1 to 3 was used. As in Comparative Example 9, it is clear that it has a considerable M advantage in terms of impact strength even when compared to a blend with αBAN. @ is a graph) The evaluation result is not much different from ABS,
Graft polymers are also effective in improving the impact strength of maleimide copolymers.

From Examples 6 to 8, it is clear that both the weather-resistant resins, AAs resin and AHiS resin, are effective in improving heat resistance.

As shown in Examples 9 and 10, blending As resin into an ABS and maleimide copolymer system is effective in improving the melt flow value, which is a measure of processability.

In Examples 11 and 12, it is clear that blending the αBAN resin into the ABEi and maleimide copolymer system causes less decrease in heat resistance and slightly improves processability.

Further, as is clear from Examples 13 to 15, by blending polycarbonate resin, a highly impact-strength and heat-resistant resin can be obtained.

〔Effect of the invention〕

According to the present invention, a resin composition can be obtained which has good heat resistance, is resistant to thermal decomposition or thermal discoloration during molding, and has high impact resistance.

Patent applicant: Mitsubishi Rayon Co., Ltd. -0 Bu

Claims (1)

[Claims] 50 to 80% by weight of aromatic vinyl, 10 to 80% by weight of vinyl cyanide
30% by weight and a maleimide monomer represented by the formula (A) ▲ Numerical formula, chemical formula, table, etc. ▼ (A) (In the formula, R is hydrogen, an alkyl group of C_1 to C_4, a cyclohexyl group, an aryl group, or (represents a substituted aryl group.) When emulsion polymerizing 5 to 40% by weight, 30% or more of the total aromatic vinyl is charged into the polymerization system before the start of polymerization, and vinyl cyanide and the maleimide monomer of formula (A) are added to the polymerization system. If polymers and aromatic vinyl remain, the remainder is added continuously or in portions, and the pH of the aqueous phase at the start of polymerization is adjusted to 3 to 3.
Thermoplastic resin (I) obtained by polymerizing with a redox catalyst using an oil-soluble organic peroxide while keeping the temperature between 9 and 9.
and a rubber reinforced resin (II) obtained by graft polymerizing at least one of a nitrile monomer, an aromatic vinyl monomer, or an acrylic monomer to an elastomer having a glass transition temperature of 0° C. or less (I )/(II) ratio is 5/95-95
1. A heat-resistant and impact-resistant resin composition, characterized in that 0 to 300 parts of a thermoplastic resin that is hard at room temperature is blended into 100 parts of a thermoplastic resin composition blended within the range of