JPH0418441A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To obtain a resin composition excellent in strength in weld parts, rigidity, dimensional stability and chemical resistance by melt kneading a polyolefin having a grafted unsaturated carboxylic acid (anhydride) with an epoxy group-containing aromatic vinylic polymer. CONSTITUTION:A thermoplastic resin composition is obtained by melt kneading (A) 10-95wt.% modified polyolefin, prepared by carrying out graft reaction of a polyolefin with an unsaturated carboxylic acid (anhydride) alone or a mixture thereof with an unmodified polyolefin and having 3-1000mol/kg content of the aforementioned functional groups and 1-200g/10min MFR with (B) 90-5wt.% aromatic vinylic polymer, containing 50-1000mol/kg epoxy groups alone or a mixture thereof with an aromatic vinylic polymer containing 50-1000 mol/kg epoxy groups as a whole without any epoxy groups and having 15-200g/10min MFR.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a thermoplastic resin composition for molding which has excellent weld strength, rigidity, dimensional stability and chemical resistance.

[Conventional technology and problems]

Polyolefins have excellent moldability and chemical resistance, and are inexpensive, so they are used as general-purpose resins in many fields. However, its use is currently limited due to its lack of rigidity, particularly a significant decrease in rigidity in high temperature ranges, as well as its poor dimensional stability and paintability.

On the other hand, aromatic vinyl polymers such as folystyrene are widely used because they have excellent rigidity and dimensional stability, and in particular, have a small decrease in rigidity in high temperature ranges. It has a serious drawback of poor chemical resistance.

In view of the above, a method of blending a polyolefin and an aromatic vinyl polymer for the purpose of improving each other's defects has been considered, but in this case, there is a problem that the compatibility between the two is extremely poor.

As a method for improving the compatibility between polyolefins and polystyrene, we have used modified polyolefins obtained by grafting unsaturated carboxylic acids or their anhydrides onto polyolefins, and epoxy group-containing acrylic copolymers, epoxy group-containing styrene copolymers, etc. It has been proposed to use a polymer reaction product with an epoxy group-containing polar polymer as a compatibility improver (JP-A-58-198529). According to this method, a composition with improved compatibility, good dispersibility, and no delamination can be obtained. however,
Although the composition obtained by this method has sufficient strength in the non-welded part, it cannot be said that the strength in the welded part is at a satisfactory level, and furthermore, when left in a molten state for a long time, the dispersed particles aggregate and thicken. It was found that although there was no particular problem when molding small test pieces, there was a problem in that uneven parts occurred when molding large products.

Furthermore, regarding the action and effect of the polymer reaction product itself of a modified polyolefin and an epoxy group-containing polar polymer in JP-A-58-198529, it is said that it is used as an adhesive or as a compatibility improver and that it is not suitable for the present invention. The object of the invention is different from that of a composition, and there is no disclosure regarding its usefulness as a molded article. In addition, regarding the weight average molecular weight and functional group content of the modified polyolefin described, the weight average molecular weight and epoxy group content of the epoxy group-containing polar polymer, and the type of polar polymer, for example, the weight average molecular weight of the modified polyolefin. is 5,000 [230℃
, Melt flow rate (hereinafter sometimes simply abbreviated as MFR) at 9 loads in 2.16 1,00011
7108 or more (unmeasurable)] ~ 1,000,000 (
MF RO, 111/10m or less (unmeasurable)], the weight average molecular weight of the epoxy group-containing polar polymer is 2.000
[:MFRl, 000.9/IOM or more (unmeasurable)]
~1,000,000 (MFRo, 1.9/10M or less (unmeasurable))], and the range within which useful molded products can be obtained is not substantially specified.

Furthermore, JP-A-63-122757 discloses a modified polyolefin obtained by grafting an unsaturated carboxylic acid or its anhydride onto an epoxy group-containing polystyrene resin and a polyolefin as a compatibility improver between a polyphenylene ether resin and a polyolefin. A combination of these is proposed. Furthermore, JP-A-64-75560 also proposes a similar combination as a compatibility improver between polycarbonate resin and polyolefin. Although it is possible to obtain resin compositions with good dispersibility and excellent mechanical strength and chemical resistance using these methods, the epoxy group content, unsaturated carboxylic acid, or Its anhydride functional group content and the molecular weight of each component (
or MFR) have not been substantially specified, nor has there been any suggestion as to the importance of specifying them. After briefly examining these compositions, we discovered that
The results were similar to those of No. 8-198529, that is, the strength of the non-welded part was sufficient, but the strength of the welded part could not be said to be at a satisfactory level.
Moreover, it was found that there was a problem in that the dispersed particles agglomerated and enlarged when left in a molten state for a long time.

Furthermore, regarding the combination itself of the epoxy group-containing polystyrene resin and the modified polyolefin, the epoxy group content, the content of unsaturated carboxylic acid or its anhydride functional group, and the molecular weight (or MFR) of each component are substantially specified. Not only is it not disclosed, but there is also no disclosure regarding its usefulness as a molded product.

As explained above, there is sufficient compatibility between the polyolefin and the aromatic vinyl polymer, the dispersed particles are fine and do not aggregate and enlarge, and the weld part strength, rigidity, dimensional stability, and chemical resistance are improved. Although thermoplastic resin compositions for molding with excellent properties are desired as materials for various industrial parts, the reality is that a fully satisfactory composition has not yet been obtained. Therefore, an object of the present invention is to eliminate the drawbacks of the prior art described above, improve the compatibility between polyolefin and aromatic vinyl polymer, and improve weld strength, rigidity, and An object of the present invention is to provide a thermoplastic resin composition for molding that has excellent dimensional stability and chemical resistance.

[Means for solving problems]

As a result of intensive research, the present inventors have found that a modified polyolefin is obtained by grafting a polyolefin with an unsaturated carboxylic acid or its anhydride, and has a specific functional group content and M
Those with FR, specific epoxy group content and MFR
The inventors have discovered that a composition containing a predetermined amount of an aromatic vinyl polymer with .

That is, the present invention has the following composition diagram: 10 to 95 wt% and (
B) A thermoplastic phase composition formed by melt-kneading 95 to 5 wt%.

(~ A modified polyolefin obtained by grafting an unsaturated carboxylic acid or its anhydride to a polyolefin, or a mixture of this and a polyolefin, and the content of the unsaturated carboxylic acid or its anhydride functional group is 3～1. OOOmmo l/ni'l, 2
The melt flow rate (MFR) at 30°C and a load of 2.16 kg is 1 to 200 g/10wn.

(B) An aromatic vinyl polymer containing epoxy groups with an epoxy group content of 50 to 1,000 mmo
l/kg alone or as a mixture of this and an aromatic vinyl polymer containing no epoxy groups, and component CB) has an overall epoxy group content of 50 to 50.
1,000 mmol/kg Melt flow rate (MFR) at 230℃ and 2.16 to 9 loads is 15~
200 g/l 0! Something that is I11.

In the present invention, the modified polyolefin used as a component can be suitably obtained by grafting an unsaturated carboxylic acid or its anhydride onto a polyolefin.

The above polyolefins include low density polyethylene, linear low density polyethylene, high density polyethylene, polypropylene, polybutene-1, polypentene-1, polyhexene-1, poly-4-methylpentene-1 or ethylene, propylene, butene-1, Examples include copolymers obtained from a plurality of olefin monomers selected from pentene-1, hexene-1,4-methylpentene-1, and the like. Among these, polypropylene or a crystalline copolymer of propylene and ethylene or other olefin, which has propylene as a main component, is preferred.

In addition, examples of the unsaturated carboxylic acid or its anhydride to be graft-reacted to the polyolefin include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, citraconic acid, maleic anhydride, itaconic anhydride, citraconic anhydride, cis- 4-cyclohexene-1,2-dicarboxylic acid, cis-4cyclohexene-1,2-dicarboxylic anhydride, endo-bicyclo(2,2,1)-5-heptene-2,3-dicarboxylic acid, endo-bicyclo −(2,
Examples include 2,1)-5-heptene-2,3-dicarboxylic anhydride, among which maleic anhydride is particularly preferred. These unsaturated carboxylic acids or their anhydrides are
The modified polyolefin, which may be used alone or in combination of two or more, can be produced by various known methods. For example, a method in which a polyolefin and an unsaturated carboxylic acid or its anhydride are reacted in a molten state using an extruder or a Banbury mixer in the presence or absence of a reaction initiator, or a method in which both are reacted in a solution state in the presence of a solvent. Examples include methods of reacting.

The component may be a modified polyolefin alone or a mixture of this and an unmodified polyolefin.

In the case of such a mixture, the unmodified polyolefin to be mixed with the modified polyolefin is widely suited to be the polyolefin used in the production of the modified polyolefin, but in particular, polypropylene or propylene containing propylene as a main component and ethylene or other olefins are suitable. A crystalline copolymer of is preferred.

The method for mixing the modified polyolefin and the unmodified polyolefin may be any method that allows mixing of both, including a method in which both are melt-kneaded in advance or a method in which each is blended when producing the composition of the present invention. It can be adopted without any particular restrictions.

The component in the present invention has a functional group content of unsaturated carboxylic acid or its anhydride of 3 to 1,000 mm o 1
7 kg, preferably 5 to 900 mmol/kg, and M
FR is 1-200, SF/10C+1. Preferably 3
~1801/10m1! It is necessary that That is, if the functional group content is less than 3 mmo 1 / k'i, a composition having good weld strength cannot be obtained;
On the other hand, if the amount exceeds 1,000 mmol/9, it is not preferable because a gelatinized product will form in the composition and the commercial value will decrease. Also, MFR is 1-200. ! A range outside of i'7101m is similarly undesirable, since the compatibility decreases and a composition with good weld strength cannot be obtained.

Next, the epoxy group-containing aromatic vinyl polymer used as a component in the present invention is a copolymer consisting of an epoxy group-containing unsaturated monomer, an aromatic monomer, or a copolymer of these and another unsaturated monomer. can be widely shown.

Examples of the epoxy group-containing unsaturated monomer include glycidyl acrylate, glycidyl methacrylate, allyl glycidyl ether, 2-methylallyl glycidyl ether, and among them, glycidyl methacrylate is particularly suitable.

In addition, aromatic vinyl monomers include styrene, α-
Methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, chlorostyrene, vinyltoluene, etc. can be used, among which styrene is particularly preferred.

Other unsaturated monomers include cyanide monomers such as acrylonitrile, methacrylonitrile, and acrylic or methacrylic ester monomers such as methyl acrylate, methyl methacrylate, ethyl acrylate, and ethyl methacrylate.

Specific examples of component (B), that is, the epoxy group-containing aromatic vinyl polymer, include styrene-glycidyl methacrylate copolymer and styrene-acrylonitrile-glycidyl methacrylate copolymer.

The component (with) may be an epoxy group-containing aromatic vinyl polymer alone, or may be a mixture of this and an aromatic vinyl polymer not containing an epoxy group.

In the case of such mixtures, aromatic vinyl polymers containing no epoxy groups include aromatic vinyl monomer homopolymers, copolymers of aromatic vinyl monomers and other unsaturated monomers, and rubber-reinforced rubber-reinforced polymers. things are suitable. Specific examples include polystyrene, poly-α-methylstyrene, high-impact polystyrene, styrene-acrylonitrile copolymer, styrene-methyl methacrylate copolymer, styrene-acrylonitrile-methyl methacrylate copolymer, and the like. Polystyrene or styrene-acrylonitrile copolymer.

The epoxy group-containing aromatic vinyl polymer and the epoxy group-free aromatic vinyl polymer can be mixed by melting and kneading them in advance, or by mixing them separately when producing the composition of the present invention. Any method that allows mixing of the two, including the method of blending, can be adopted without particular limitation.

Component (B) in the present invention has an epoxy group content of 5
0 to 1,000 mmol/4, preferably 6, o to 80
0 mmol/jc9, and MFR is 15-200
, 9/10 drive, good I L<U30~180 &/10m
It is necessary that there be f. That is, if the epoxy group content is less than 9 to 50 mmol, a welded material with good weld strength cannot be obtained;
If it exceeds 1Z~, gelled products will form in the composition and the commercial value will decrease, which is not preferable. Also, MFR is 15-2
A range outside of 00 #/10!1211 is similarly undesirable since the compatibility decreases and a composition having good weld strength cannot be obtained.

In addition, when component (B) is a mixture of an epoxy group-containing aromatic vinyl polymer and an epoxy group-free aromatic vinyl polymer, even if the epoxy group content and M F Even if R is included within the scope of the present invention, the epoxy group content of the epoxy group-containing aromatic vinyl polymer itself is 50 to 1. OOOmmo] 7kg
A composition having good weld strength cannot be obtained unless it is within the range of .

The reason may be as follows. That is, when the epoxy group content of the epoxy group-containing aromatic vinyl polymer to be mixed exceeds the above range, the compatibility between the polymer and the aromatic vinyl polymer not containing epoxy groups decreases. Conversely, when the epoxy group content of the epoxy group-containing aromatic vinyl polymer is less than the above range, the amount of functional groups in component (B) as a whole will be insufficient. This is thought to be because the compatibility with the components deteriorates, and in any case, only a composition that is non-uniform and has poor compatibility is obtained.

The thermoplastic resin composition of the present invention contains such component (5)
It can be obtained by melt-kneading and component (B),
The mixing ratio is 10-95 wt% for the former and 90-5 wt% for the latter.
wt%, preferably the former 35-80 wt, the latter 6
It is 5 to 20 wt%. If the composition diagram is less than 10 wt %, the resulting composition will have poor chemical resistance, and if it exceeds 95 wt %, the rigidity and dimensional stability will be poor, so it should be avoided.

The above melt kneading is carried out at 160 to 300° using a known device such as a -screw or twin-screw extruder or a Banbury mixer.
C1 Preferably, it can be carried out at a temperature of 200 to 260°C. Furthermore, stabilizers, plasticizers, antistatic agents, lubricants, pigments, fillers, etc. can be added during melt mixing, if necessary.

9. The thermoplastic resin composition of the present invention as explained above is produced by combining a modified polyolefin as a polyolefin component and an epoxy group-containing aromatic vinyl polymer as an aromatic vinyl polymer component to achieve ~j molecular reactivity. In this case, for modified polyolefins, the functional group content of unsaturated carboxylic acid or its anhydride and M
By limiting the epoxy group content and MFR for epoxy group-containing aromatic vinyl polymers,
It has become possible to optimize compatibility and mechanical properties.

〔Example〕

EXAMPLES The present invention will be specifically described below with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

The evaluation method was as follows.

(1) Tensile strength (non-welded part) Based on JIS K-7113. The test piece used was a JIS No. 1 test piece prepared by injection molding.

(2) Tensile strength of weld portion Compliant with JIS K-71,13. The test piece was made by injection molding and had the same shape as the JIS No. 1 test piece, but a mold with gates at both ends of the test piece was used to create a weld in the center. .

(3) Weld part tensile strength retention rate Based on the results of (1) and (2), it was calculated using the following formula.

(4) Chemical resistance A 41 m x 10 x 100 test piece prepared by injection molding was immersed in acetone at 23°C for 30 days, and changes in appearance were observed. At this time, those with no change were rated as ○, those with deterioration were rated as △, and those with significant deterioration or dissolution were rated as ×.

(5) Rigidity Compliant with JIS K-7203. Using a 4m x 10 x 1001m test piece made by injection molding, the bending elastic modulus and bending strength were measured at 23°C, 150°C, and 80°, respectively.
The measurement was carried out in an atmosphere of C.

(6) Dispersed Particle Size The obtained composition pellets were pressed for 2 minutes using a hot press to form an isotropic sheet with a thickness of 180 to 200 μm. This sheet was broken in liquid nitrogen, and the particle size of the dispersed particles on the broken surface was observed using a scanning electron microscope.

(7) Dispersed particle size (after annealing) The resulting composition pellet was kept in a molten state at 250°C for 60 minutes using an Instron capillary rheometer (trade name), and then at a low shear rate of 12 sec-'. I pushed it out. This extrudate was subjected to a hot press, and the particle diameter of the dispersed particles was observed in the same manner as in (5) to check for the presence or absence of agglomeration and enlargement.

In addition, the following components were used. MF listed
All H values were measured at 230°C and a load of 2.16 to 9.

(a) Maleic anhydride modified polypropylene-IMFR
o, 5&/10m powdered polypropylene homopolymer 1
00 parts by weight, 0.5 parts by weight of maleic anhydride, 0.0 parts by weight of 1,3-bis(t-butylperoxyisopropyl)benzene.
05 parts by weight of 2.6-di-t-butyl-p-cresol and 0.1 parts by weight of 2.6-di-t-butyl-p-cresol were mixed in a Henschel mixer (trade name) and mixed with a screw with a diameter of 45 m.
, MFR30g/10m1 obtained by melt-kneading at 200°C with a twin-screw presser with L/D=30! , grafting rate 0
．． Maleic anhydride-modified polypropylene (abbreviated as PP-MAR-1 in Cloth 1 and Table 2 below) with a content of 31 wt% (functional group content: 31 mmo I/9).

(b) Maleic anhydride modified polypropylene-21,3
-MFR160F/10K obtained in the same manner as in (a) except that the amount of bis(1-butylperoxyisopropyl)benzene added was 0.15 parts by weight, grafting ratio 0.4
3 wt% (functional group amount 43 mmol/kg) of maleic anhydride-modified polypropylene (in Tables 1 and 2, PP
-MAR-2).

(c) Maleic anhydride modified polypropylene-31,3
MFR270F/I Qm obtained in the same manner as in (a) except that the amount of -bis(t-butylperoxyisopropyl)benzene added was 0.22 parts by weight.

Grafting rate 0.45 wt% (functional group amount 45 mmol
/g) maleic anhydride-modified polypropylene (abbreviated as PP-MAR-3 in Tables 1 and 2).

(d) Acrylic acid modified polypropylene MFR4211
/10HA, acrylic acid graph) ratio 6 wt% (functional group amount 830 mmo]/kg) acrylic acid modified polypropylene (PB-1001 manufactured by BP Performance Plastics, abbreviated as PP-AA in Tables 1 and 2).

(e) Polypropylene-1 MF RO,5,li'/10wn polypropylene homopolymer (abbreviated as PP-1 in Tables 1 and 2).

(f) Polypropylene-2 A polypropylene homopolymer with an MFR of 25&/10m (abbreviated as PP-2 in Tables 1 and 2).

(g) Polypropylene-3 MFRo, 100 parts by weight of 5N/10 dark powdered polypropylene homopolymer, 1,3-bis(t-butylperoxyisopropyl)benzene 0.17]ii part, 2,6-
0.1 part by weight of di-t-butyl-p-cresol was tri-blended in advance using a Henschel mixer (trade name), and this was melt-mixed at 200°C using a twin-screw extruder with a screw diameter of 45 m and L/D = 30. The scarlet MF R1
60jj/10rmtt polypropylene homopolymer (abbreviated as PP-3 in Tables 1 and 2).

(H) Styrene-glycidyl methacrylate copolymer-1 Styrene-glycidyl methacrylate copolymer (NOF) with weight average molecular weight 150,000, MFR 49 & 710, glycidyl methacrylate amount 5 wt% (epoxy group content i 350 mmo 1/kg) Blenomer CP-1505S manufactured by ■, in Tables 1 and 2, St-GM
(abbreviated as A-1).

(S) Styrene-glycidyl methacrylate copolymer-2 Weight average molecular weight 100,000, MFR170&/10
That is, a styrene-glycidyl methacrylate copolymer (Blenomer CP-100550 manufactured by NOF ■ in Tables 1 and 2, St-GMA-
(abbreviated as 2).

(NU) Styrene-glycidyl methacrylate copolymer-3 Weight average molecule i21. ooo, MFRl, 000 g7
10 w or more (unmeasurable), glycidyl methacrylate amount 50 wt% (epoxy group content 3500 mmol/k
g) styrene-glycidyl methacrylate copolymer (
Blenomer CP-5030 Table 1 and Table 2 manufactured by NOF ■
middle, abbreviated as St-GMA-3).

(L) Styrene-acrylonitrile-glycidyl methacrylate copolymer-1 Styrene-acrylonitrile-glycidyl methacrylate copolymer with a weight average molecular weight of 50,000, MFR640F710, and a glycidyl methacrylate amount of 10 wt% (epoxy group content 700 mmol 7 kg) (
Brenomer CP-5105A0 (abbreviated as St-AN-GMA~1 in Tables 1 and 2) manufactured by NOF ■.

(w) Styrene-acrylonitrile-glycidyl methacrylate copolymer-2 Weight average molecular weight 8jOO1MFR1,000,9/1
0 rra or more (unmeasurable), glycidyl methacrylate amount 20 wt% (Ephoxy group content i 1,400 m
mol 7 to 9) styrene-acrylonidol-glycidyl methacrylate copolymer (Blenomer CP-205A0 manufactured by NOF Co., Ltd. in Tables 1 and 2, St-AN-
(abbreviated as GMA-2).

(W) Polystyrene weight average molecular weight 210,000% MF R10g/10
mx polystyrene (abbreviated as Ps in Tables 1 and 2)
.

Examples 1 to 10 As shown in Clothing 1 below, each ingredient was put into a Henschel mixer (trade name) in a predetermined amount and tri-blended, then the screw diameter was 45 mm and L/D = 30.
(7) Melt kneading was carried out at 250'c using a twin-screw extruder. A test piece was prepared from each of the obtained composition pellets by injection molding (250° C.), and the tensile strength (non-welded part), welded part tensile strength and rigidity were measured. The welded part tensile strength retention rate was calculated from the tensile strength (non-welded part) and the welded part tensile strength. In addition, each composition pellet and each of these composition pellets were annealed at 250°C using a capillary rheometer (trade name) and heat-pressed (
250°C), and the dispersed particle size of each was observed. The above results are shown in Table 1.

Comparative Examples 1 to 3 Single polypropylene (PP-2), single polystyrene (PS), and single styrene-glycidyl methacrylate copolymer (st-
A test piece of GMA-1) was prepared, and the tensile strength (non-welded part), welded part tensile strength, and rigidity were measured. Further, the welded part bow tensile strength retention rate was calculated from the tensile strength (non-welded part) and the welded part tensile strength. The above results are also shown in Table 2.

Comparative Examples 4 to 11 In the same manner as Examples 1 to 10, the components shown in Table 2 were blended, melted and kneaded, and the resulting compositions were evaluated. The above results are also shown in Table 2.

As is clear from the results in Table 1, the thermoplastic resin compositions according to the examples of the present invention have a rigidity, especially 50 to 80°C.
It has excellent rigidity in the high temperature range, the dispersed particles are fine, and the weld tensile strength, weld tensile strength retention rate, and chemical resistance are significantly improved. It can be seen that it has advantages such as not causing hypertrophy (hypertrophy).

On the other hand, as is clear from the results in Table 2, Comparative Example 1 is an example of a single polypropylene product, but it lacks strength and rigidity, particularly in the high temperature range, and Comparative Examples 2 and 3 are polystyrene single products. This is an example of a single styrene-glycidyl methacrylate copolymer, but it is known that the chemical resistance is poor. In addition, Comparative Example 4 is an example of a composition in which polypropylene and polystyrene, which do not have functional groups or epoxy groups, are blended, but the dispersed particles are extremely large, the weld part strength is very weak, and the rigidity is hardly improved. do not have. Comparative Examples 5 and 7 are cases where the functional group content of the prisoner component and the epoxy group content of the CB) component are insufficient, and although the dispersed particles are fine to some extent, the strength of the weld part is very weak. Furthermore, the annealing caused significant agglomeration and enlargement of the dispersed particles. Comparative example 6
is a case where M'FR of the prisoner component is outside the scope of the present invention, but
The MFR of the resulting composition was too high to be injection molded, and the dispersed particles were also huge. Comparative example 8 is (B)
Although the MFR of the components was outside the range of the present invention, the dispersed particles were large and the strength of the weld portion was very weak, and the improvement in rigidity was also slight. In Comparative Example 9, the epoxy group content and MFR of component (B) were outside the range of the present invention, but gelation occurred and melt crosstalk was not possible. Comparative Examples 10 and 11 both used an epoxy group-containing aromatic vinyl polymer outside the scope of the present invention and polystyrene that does not contain epoxy groups, and the overall epoxy group content and MFR of component (B) were the same as those of the present invention. Although this was within the range, the dispersed particles were large and the weld strength was weak, and the improvement in rigidity was slight.

〔Effect of the invention〕

As mentioned above, the thermoplastic resin composition of the present invention is very suitable as a molding material in terms of melt viscosity, and since the polyolefin component and the aromatic vinyl polymer have high compatibility, the thermoplastic resin composition of the present invention has dispersed particles. fine, excellent weld strength,
It has rigidity, especially in the high temperature range of 50 to 80℃, dimensional stability, and chemical resistance, and does not cause agglomeration and enlargement even if kept in a molten state for a long time, so it is suitable for the size of the injection molding machine and the molding process. The above excellent properties can be obtained regardless of the thickness of the product or the residence time in the molding machine. The thermoplastic resin composition of the present invention can be suitably used in various parts, such as parts for home appliances and parts for automobiles.

that's all

Claims (1)

[Claims] (1) The following components (A) 10-95 wt% and (B) 90-95 wt%
A thermoplastic resin composition characterized by being formed by melt-kneading 5 wt%. (A) A modified polyolefin obtained by grafting an unsaturated carboxylic acid or its anhydride to a polyolefin, or a mixture of the modified polyolefin and a polyolefin, and the content of the unsaturated carboxylic acid or its anhydride functional group. is 3 to 1,000 mmol/kg, 230℃
, melt flow rate (MF) at 2.16 kg load
R) is 1 to 200 g/10 mm. (B) An aromatic vinyl polymer containing epoxy groups, with an epoxy group content of 50 to 1,000 mmol/
kg alone or as a mixture of this and an aromatic vinyl polymer containing no epoxy groups, and component (2) has an overall epoxy group content of 50 to 1,
000mmol/kg, 230℃, melt flow rate (MFR) at 2.16kg load is 15-200g
/10mm.