JPH115912A - Molding resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding resin composition that gives a molded article having low coefficient of friction and excellent in sliding characteristics and wear resistance, and that is excellent in such molding and processing characteristics as good flowability and mold release properties and being free from the staining of a mold with the resin. SOLUTION: This composition contains 100 pts.wt. of one resin (A) selected from the group consisting of polyacetal resins, ABS resins, polyamide resins, polyphenylene oxide resins, polyimide resins, thermoplastic polyester resins, polycarbonate resins, epoxy resins, thermosetting unsaturated polyester resins, and phenolic resins, and 0.1-10 pts.wt. liquid oxidized ethylene/α-olefin random copolymer (B) which comprises an oxidized modification of ethylene/α-olefin random copolymer consisting of 20-80 mol.% ethylene units and 20-80 mol.% α-olefin units and which has a number-average molecular weight Mn of 500 to 10,000 and a molecular weight distribution (Mw/Mn) of 1.2 to 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding resin composition, and more particularly to a molding resin composition for obtaining a molded article having slidability and abrasion resistance.

[0002]

2. Description of the Related Art Engineering plastics such as polyacetal resin, ABS resin, polyamide resin, polyphenylene oxide resin, polyimide resin, thermoplastic polyester resin, polycarbonate resin, epoxy resin, thermosetting unsaturated polyester resin and phenol resin have melting points or Since it has a high softening point and excellent mechanical properties, it is widely used in various industrial fields such as the automobile industry, the electric and electronic industries. However,
The resin used for parts having sliding parts, such as gears of precision equipment, is required to have a low coefficient of friction, that is, to be excellent in slidability, and also to be excellent in wear resistance. These resins by themselves are insufficient in slidability and abrasion resistance.

[0003] Therefore, conventionally, there is a type in which grease or the like is impregnated as a slidability improving agent. However, grease oozing out on the surface of a molded product stains surrounding parts and maintains its effect as a slidability improving agent. Sex is not enough. As another method, there is a method of containing a fluorine-based resin or an olefin-based polymer. Although this method improves the slidability of the resin, the fluorine-based resin is generally expensive, and these polymer additives are used. Is poor in compatibility with the above-mentioned resin, so that phase separation occurs on the surface of the molded article and the polymer additive is peeled off, and as a result, there are difficulties in processing and molding such as poor releasability from a mold. Was.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a molded product having a low coefficient of friction, excellent slidability, excellent wear resistance, good fluidity and good mold release properties, and An object of the present invention is to provide a molding resin composition having excellent moldability such as no resin stain.

[0005]

The present invention relates to the following molding resin composition. (1) (A) selected from the group consisting of polyacetal resin, ABS resin, polyamide resin, polyphenylene oxide resin, polyimide resin, thermoplastic polyester resin, polycarbonate resin, epoxy resin, thermosetting unsaturated polyester resin, and phenol resin 100 parts by weight of one kind of resin, and (B) (i) of all structural units,
An ethylene / α-olefin random copolymer having 20 to 80 mol% of ethylene units and 20 to 80 mol% of α-olefin units, and (ii) having a number average molecular weight Mn of 500 to 80%. 10,000, and (iii) a liquid oxidation-modified ethylene / α-olefin random copolymer having a molecular weight distribution (Mw / Mn) of 1.2 to 3 0.1 to 0.1
A molding resin composition comprising 10 parts by weight. (2) The liquid oxidation-modified ethylene / α-olefin random copolymer (B) has an oxygen content of 0.1 to 20% by weight, an acid value of 0.1 to 50 mgKOH / g, and a saponification value of 0.1 to 1
The resin composition for molding according to the above (1), wherein the amount is 00 mgKOH / g. (3) The molding resin composition according to the above (1) or (2), wherein the liquid oxidation-modified ethylene / α-olefin random copolymer (B) is an oxidation-modified ethylene / propylene random copolymer. (4) The resin composition for molding according to any one of the above (1) to (3), wherein the resin (A) is a polyacetal resin. (5) The above (1) to (1), wherein the resin (A) is an ABS resin.
The resin composition for molding according to any one of (3). (6) The resin (A) is a polyamide resin (1) to
The resin composition for molding according to any one of (3).

As described above, the molding resin composition of the present invention comprises a specific resin (A) and a small amount of a specific liquid oxidation-modified ethylene / α-olefin random copolymer (B). .

First, the resin (A) will be described.
The resin (A) is a polyacetal resin, an ABS resin,
Thermoplastic resins such as polyamide resin, polyphenylene oxide resin, polyimide resin, thermoplastic polyester resin, and polycarbonate resin, and thermosetting resins such as epoxy resin, thermosetting unsaturated polyester resin, and phenol resin. These resins are well-known resins as described in publications such as “Engineering Plastics” (edited by Makihiro and Rikio Kobayashi, published by Sangyo Tosho Co., Ltd.), “FPR Design Handbook”, and the like. Its definition is clear. Hereinafter, preferred embodiments of each resin will be described.

(1) Polyacetal resin Typically, a resin obtained by ring-opening polymerization of formalin or trioxane together with ethylene oxide, if desired, in the presence of a cationic catalyst, wherein a polyoxymethylene chain has a main skeleton In the present invention, a copolymer type resin is preferable. Such a polyacetal resin is commercially available, for example, Iupital (Mitsubishi Engineering Plastics Co., Ltd.)
And the like, and can be preferably used in the present invention.

(2) ABS resin Typically, ABS resin is an impact-resistant resin obtained by graft-polymerizing acrylonitrile and styrene to polybutadiene. In the present invention, the polybutadiene component is 5 to 5%.
40% by weight, and the weight ratio of styrene component to acrylonitrile component (styrene / acrylonitrile) is 70 /
Those having a ratio of 30 to 80/20 are preferred. Such an A
BS resins are commercially available, and include, for example, trade names Stylac (Asahi Kasei Kogyo Co., Ltd.) and Psycholac (Ube Saikon Co., Ltd.), which can be preferably used in the present invention.

(3) Polyamide resin Typically, a resin obtained by polycondensation of a diamine and a dicarboxylic acid, or ring-opening polymerization of caprolactam. In the present invention, an aliphatic diamine and an aliphatic or aromatic resin are used. A polycondensation reaction product of an aromatic dicarboxylic acid is preferred. Such polyamide resins are commercially available, for example, trade names such as Leona (Asahi Kasei Kogyo Co., Ltd.) and Zytel (Dupont).
Japan Limited) and the like, which can be preferably used in the present invention.

(4) Polyphenylene oxide resin Typically, a resin obtained by oxidative coupling of 2,6-dimethylphenol in the presence of a copper catalyst, but other resins may be blended with this resin. The modified polyphenylene oxide resin modified by the method described in the above can also be used in the present invention. In the present invention,
A blend modification of a styrenic polymer is preferred. Such polyphenylene oxide resins are commercially available,
For example, trade names such as Xylon (Asahi Kasei Kogyo Co., Ltd.) and Iupiace (Mitsubishi Engineering Plastics Co., Ltd.) can be mentioned, and they can be preferably used in the present invention.

(5) Polyimide resin Typically, a resin obtained by polycondensing a tetracarboxylic acid and a diamine to form an imide bond in a main skeleton. Those formed from diaminodiphenyl ether are preferred.
Such a polyimide resin is commercially available, and may be, for example, Vespel (Dupont Japan Limited) or the like, and can be preferably used in the present invention.

(6) Thermoplastic polyester resin A resin typically obtained by polycondensing a dicarboxylic acid and a diol. In the present invention, polyethylene terephthalate, polybutylene terephthalate, polyethylene 2,6-naphthalene Dicarboxylate, polycyclohexane terephthalate and the like are preferably used. Such thermoplastic polyester resins are commercially available, for example, the trade name Rynite (Dupont Japan)
Limited) and the like, which can be preferably used in the present invention.

(7) Polycarbonate resin Typically, a resin obtained by reacting an aromatic diol (for example, bisphenol A) with phosgene. In the present invention, diethylene glycol diallyl carbonate is preferred. Such polycarbonate resins are commercially available, for example, brand name NOVARE
X (Mitsubishi Chemical Co., Ltd.), Panline (Teijin Kasei Co., Ltd.), Lexan (Nihon GE Plastics Co., Ltd.) and the like can be preferably used in the present invention.

The above resins (1) to (7) are thermoplastic resins. The resins (8) to (10) described below are thermosetting resins, and a description will be given of a resin before thermosetting.

(8) Epoxy resin Typically, an epoxy resin is a resin obtained by reacting an aromatic diol (for example, bisphenol A) with epichlorohydrin in the presence of an alkali. 5000 bisphenol A type epoxy resin, bisphenol F type epoxy resin,
Bisphenol S type epoxy resins are preferred. Such epoxy resins are commercially available, and include, for example, trade names such as EPOMIC (Mitsui Petrochemical Co., Ltd.), EPICLON (Dainippon Ink Chemical Co., Ltd.), and Sumiepoxy (Sumitomo Chemical Co., Ltd.). And can be preferably used in the present invention.

(9) Thermosetting Unsaturated Polyester Resin Typically, a resin obtained by an esterification reaction between an aliphatic unsaturated dicarboxylic acid and an aliphatic diol. Resins obtained by subjecting an unsaturated dicarboxylic acid such as fumaric acid or the like to an esterification reaction with a diol such as ethylene glycol or diethylene glycol are preferred. Such a thermosetting unsaturated polyester resin is commercially available, and examples thereof include Rigolac (trade name of Showa Kogaku Co., Ltd.) and Sumicon (Sumitomo Bakelite Co., Ltd.), which are preferably used in the present invention. Can be.

(10) Phenol Resin In the present invention, both the so-called novolak type and resol type are included, but a novolak type cured with hexamethylenetetramine or a solid resol mainly containing a dimethylene ether bond is preferable. Such a phenol resin is commercially available, and examples thereof include SUMICON PM (Sumitomo Bakelite Co., Ltd.) and Nikka Line (Nippon Synthetic Chemical Industry Co., Ltd.), which can be preferably used in the present invention. .

Among the above resins (1) to (10),
(1) Polyacetal resin, (2) ABS resin and (3) polyamide resin are preferably used as resin (A).

Next, a liquid oxidation-modified ethylene / α-olefin random copolymer (B) (hereinafter also simply referred to as a modified copolymer (B)) used in the resin composition for molding of the present invention.
Will be described. The modified copolymer (B) used in the resin composition for molding of the present invention has an ethylene unit in all structural units of 20 to 80 mol%, preferably 30 to 70 mol%, more preferably 40 to 60 mol. Α-olefin unit is 20 to 80 mol%, preferably 30 to 70 mol%.
It is an oxidized modified product of a random ethylene / α-olefin random copolymer (hereinafter also simply referred to as an unmodified copolymer (B ′)) occupying in an amount of 40 mol%, more preferably 40 to 60 mol%.

The α-olefin of the unmodified copolymer (B ′) includes propylene, butene-1, pentene-
1,4-methylpentene-1, hexene-1, heptene-1, octene-1, nonene-1, decene-1, undecene-1, dodecene-1, tridecene-1, tetradecene-1, hexadecene-1, heptacene Α-olefins having 3 to 20 carbon atoms such as -1, octadecene-1, nonadecene-1 and eicosene-1 can be exemplified. Among them, propylene is most preferable in terms of the productivity of the unmodified copolymer (B ′) and the like.

The unmodified copolymer (B ') has a non-conjugated diene unit such as dicyclopentadiene, ethylidene norbornene, 1,6-hexadiene as a structural unit in addition to an ethylene unit and an α-olefin unit. It can be contained in a small amount within a range not to impair the achievement of the object of the present invention, but the total amount of the ethylene unit and the α-olefin unit is 90 to 100% by mole, particularly 95 to 100% by mole. Is preferred.

The number average molecular weight Mn of the modified copolymer (B) used in the present invention is in the range of 500 to 10,000, preferably 600 to 8,000, more preferably 700 to 5,000. Further, the ratio of the weight average molecular weight Mw to the number average molecular weight Mn (Mw / M
n) is in the range from 1.2 to 3, preferably from 1.2 to 2.8.

When the number average molecular weight Mn is within the above range, when the resin (A) and the modified copolymer (B) are mixed, the modified copolymer (B) is evaporated by heating. Is avoided and the mixing operation is well maintained. And Mw / Mn of the modified copolymer (B) is:
1.2-3 and the condition that the molecular weight distribution of the modified copolymer (B) is narrow and the condition of the number average molecular weight Mn are combined,
The result is that the molding resin composition of the present invention is excellent in various properties such as slidability, abrasion resistance, and moldability.

The liquid oxidation-modified ethylene / α-olefin random copolymer (B) more preferably used in the molding resin composition of the present invention satisfies the following conditions (a), (b) and (c): Is what it is. (A) The oxygen content is 0.1 to 20% by weight, preferably 0.5 to 15% by weight, more preferably 1 to 10% by weight. (B) The acid value (mgKOH / g) is 0.1 to 50, preferably 0.2 to 45, more preferably 0.5 to 40. (C) The saponification value (mgKOH / g) is 0.1 to 100, preferably 0.2 to 90, more preferably 0.5 to 80.

The acid value and the saponification value were measured by
IS K2501-1980 and JIS K0070-
This is performed according to the method described in 1966. When the modified copolymer (B) satisfies the above conditions (a) to (c), the affinity between the resin (A) and the modified copolymer (B) is improved and uniform mixing becomes possible. , The modified copolymer (B)
Of the molded resin composition of the present invention is also substantially suppressed.

The liquid oxidation-modified ethylene / α-olefin random copolymer (B) is obtained by randomly oxidizing ethylene and α-olefin units at the molecular terminals and in the molecular main chain of the unmodified copolymer (B ′). The oxygen-containing functional group formed by the oxidation includes, for example, a carboxyl group, an oxycarbonyl group (ester bond), a formyl group, a carbonyl group, a hydroxyl group, and the like.

The contents of the above groups contained per 1000 g of the modified copolymer (B) are as follows. That is, the content of the carboxyl group is usually 0.01 to 1 mol, preferably 0.01 to 0.8 mol. The content of oxycarbonyl group (ester bond) is usually 0.00
It is 1-2 mol, preferably 0.01-2 mol, more preferably 0.01-1.5 mol. The sum of the contents of the formyl group and the carbonyl group (all carbonyl groups) is 0.01
To 15 mol, preferably 0.05 to 10 mol. The content of the hydroxyl group is 0.01 to 15 mol, preferably 0.05 to 10 mol.

The liquid oxidatively modified ethylene α-
The olefin random copolymer (B) is, for example, an unmodified copolymer (B ′) produced by appropriately selecting polymerization conditions from the polymerization method described in Japanese Patent Publication No. 2-1163 by the present applicant. ) Can also be produced by oxidative modification by selecting an oxidizing condition from the oxidizing method also described in Japanese Patent Publication No. 7-78096 by the present applicant.

In the unmodified copolymer (B ′), (i) the ethylene units occupy 20 to 80 mol% and the α-olefin units 20 to 80 mol% of all the structural units, as described above. (Ii) the number average molecular weight Mn is preferably from 500 to 10000, more preferably from 600 to 8
000, particularly preferably from 700 to 5000,
And (iii) the ratio (Mw / Mn) between the weight average molecular weight Mw and the number average molecular weight Mn is preferably 1.2 to 3.0, more preferably 1.2 to 3.0, and particularly preferably 1.2. ~
2.8 is desirable from the viewpoint of easily producing the modified copolymer (B).

The above number average molecular weight and Mw / Mn of the modified copolymer (B) and the unmodified copolymer (B ')
Is a gel permeation chromatography (GP
The measurement was performed by the method C) using monodisperse polystyrene as a standard substance and using tetrahydrofuran (THF) as a solvent. Therefore, Mn and Mw / Mn are values in terms of polystyrene.

The liquid oxidation-modified ethylene / α-olefin random copolymer (B) is used in an amount of 0.1 to 10 parts by weight, preferably 0.2 to 10 parts by weight, based on 100 parts by weight of the resin (A).
To 8 parts by weight, more preferably 0.5 to 6 parts by weight. The resin composition for molding of the present invention, in which the modified copolymer (B) is blended in the above ratio with respect to the resin (A), is excellent in slidability, wear resistance, and moldability.

In the present invention, the method of mixing the resin (A) and the liquid oxidation-modified ethylene / α-olefin random copolymer (B) is not particularly limited, and any conventionally known mixing method is employed. be able to. For example, when the resin (A) is a thermoplastic resin, both can be uniformly dispersed and mixed by kneading the resin (A) while melting. As a kneading means, a single screw extruder, a twin screw extruder,
A kneader, a plastmill or the like can be used. The kneading temperature, kneading time and other conditions depend on the resin (A) used.
Uniform mixing can be achieved by appropriately selecting the type of the modified copolymer (B), the mixing ratio, and the like.

When the resin (A) is a thermosetting resin, since the uncured resin is usually in a liquid state, it can be uniformly mixed using a device such as a homomixer or a Henschel mixer.

From the molding resin composition of the present invention obtained as described above, molded articles can be obtained by various molding methods. The obtained molded article is excellent in slidability, wear resistance and the like. Further, the resin composition for molding is excellent in moldability. Therefore, the molding resin composition of the present invention is a field in which slidability and wear resistance are required, for example, gears, rotating shafts,
It is used for applications such as bearings, but can also be used for applications where the above properties are not required.

As the molding method, depending on the difference between a thermoplastic resin and a thermosetting resin, an extrusion molding method, an injection molding method, a vacuum molding method, a blow molding method, a compression molding method, a transfer molding method, a RIM molding method, a casting method. A molding method widely used for thermoplastic resins and thermosetting resins, such as a molding method, can be employed. When the resin (A) is a thermosetting resin, the molding resin composition of the present invention may contain a curing agent, or may contain a curing agent at the time of molding without containing the curing agent. May be.

The molding resin composition of the present invention comprises a heat stabilizer, a weather stabilizer, a flame retardant, an antistatic agent, a nucleating agent, a coloring agent,
Additives such as a foaming agent, a filler and a reinforcing agent can be blended within a range that does not impair the purpose of the present invention.

[0038]

The molding resin composition of the present invention contains a specific resin (A) and a specific liquid oxidatively modified copolymer (B), so that a molded article having excellent slidability and abrasion resistance can be obtained. It is manufacturable, and has good moldability such as good mold release and no resin stain on the mold.

[0039]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to embodiments. However, the present invention is not limited to these examples.

Synthesis Example 1 of Modified Copolymer (B) A 49-mol ethylene unit content as a raw material in a 2-liter separable flask equipped with a stir bar, a thermometer, an air blowing tube (liquid layer blowing), and an exhaust port. % (Propylene unit content 51
Mol%), 1.1 kg of a liquid ethylene / propylene random copolymer having a number average molecular weight Mn of 3010 and a Mw / Mn of 1.6 as measured by GPC and charged to 170 ° C. while flowing nitrogen through the gas phase. Heated. When the temperature becomes constant, dry air is blown into the liquid layer through the air blowing pipe at a flow rate of 5.5 liter / min.
The reaction was carried out for 15 hours while stirring with a stirrer. Thereafter, the blowing of air was stopped, and the mixture was cooled to room temperature to obtain a liquid oxidation-modified ethylene / propylene random copolymer. The obtained oxidation-modified ethylene / propylene random copolymer was a yellow liquid having the physical properties shown in Table 1 below.

[0041]

[Table 1]

Synthesis Example 2 of Modified Copolymer (B) Liquid oxidized modified ethylene / propylene random copolymer was prepared in the same manner as in Synthesis Example 1 except that the reaction temperature was 130 ° C. and the reaction time was 90 hours. Was synthesized. The obtained oxidation-modified ethylene / propylene random copolymer was a dark yellow liquid having the physical properties shown in Table 2 below.

[0043]

[Table 2]

Synthesis Example 3 of Modified Copolymer (B) Ethylene unit content: 53 mol% (propylene unit content: 47 mol%), number average molecular weight in terms of polystyrene measured by GPC was 7,730, and Mw / Mn was 1.
A liquid oxidation-modified ethylene / propylene random copolymer was synthesized in the same manner as in Synthesis Example 1 except that the ethylene / propylene random copolymer No. 9 was used and the reaction time was 25 hours. The obtained oxidation-modified ethylene / propylene random copolymer was a yellow liquid having the physical properties shown in Table 3 below.

[0045]

[Table 3]

Example 1 100 parts by weight of a polyacetal resin [trade name: DURACON-M90, manufactured by Polyplastics Co., Ltd.] and 2 parts by weight of the liquid oxidation-modified ethylene / propylene random copolymer obtained in Synthesis Example 1 above were 30 mm biaxial. It was melt-mixed using an extruder [manufactured by Nippon Steel Works], and the obtained resin mixture was compression-molded into a 200 mm × 200 mm × 3 mm sheet using a sheet forming machine [manufactured by Kawasaki Yuko Co., Ltd. (forming temperature 250 ° C.). ). (1) friction properties, (2) processability and compatibility of the obtained molded article, (3)
The mold releasability, (4) mold contamination, and (5) molding shrinkage were evaluated by the following methods.

[Evaluation Method] (1) Friction Characteristics (Slip Property, Wear Test) The friction and wear characteristics between the same materials (resin / resin) were evaluated by the following methods. (C) of ASTM D-1894-75
According to the method, the static friction coefficient and the kinetic friction coefficient were obtained by an apparatus equipped with an instron type universal material testing machine and a jig for measuring the slip property. The abrasion test was performed under the following conditions, and the abrasion rate after the test was evaluated. Contact area: 2 cm ² Load: 1 kg (surface pressure: 0.5 kgf / cm ² ) Sliding speed: 33 times / min Stroke length: 85 mm Sliding time: 6 hours (2) Workability and compatibility Kneading with an extruder In the step, the above copolymer is well incorporated into the resin and the extrudability is good, and if the resin surface after kneading has almost no stickiness, ○, there is a slight difficulty in extrudability, and after kneading When the resin surface had stickiness, the evaluation was evaluated as “Poor”. When the copolymer was hardly taken into the resin, the extrusion property was poor, and when the resin surface after kneading was noticeably sticky, the evaluation was ×.

(3) Mold Releasability The sheet molded by the sheet molding machine was not deformed and the mold was successfully released. ○: When the sheet was partially deformed, Δ: When the deformation was severe, it was evaluated as x. (4) Mold contamination If the molded product obtained by the above molding machine was molded without any dirt, it could be ○, if there was partial dirt, △, if the whole was very dirty X was evaluated. (5) Mold Shrinkage The mold shrinkage was measured according to the method of JIS K6911. Table 4 shows the evaluation results of the above (1) to (5).

Example 2 In the same manner as in Example 1, except that the liquid oxidation-modified ethylene / propylene random copolymer obtained in Synthesis Example 2 was used, the frictional properties of the obtained molded article were changed. , Workability, compatibility, mold release, mold contamination, and mold shrinkage were evaluated. Table 4 shows the evaluation results.

Example 3 The frictional characteristics of the molded article obtained in the same manner as in Example 1 except that the liquid oxidation-modified ethylene / propylene random copolymer obtained in Synthesis Example 3 was used. , Workability, compatibility, mold release, mold contamination, and mold shrinkage were evaluated. Table 4 shows the evaluation results.

Comparative Example 1 In the same manner as in Example 1 except that the liquid oxidation-modified ethylene / propylene random copolymer was not used, the frictional properties, workability, compatibility,
The mold releasability, mold contamination, and molding shrinkage were evaluated. Table 4 shows the evaluation results.

Comparative Example 2 Example 1 was repeated except that an unmodified liquid ethylene-propylene random copolymer (ethylene unit content 52 mol%, number average molecular weight Mn 5220, Mw / Mn 1.7) was used. In the same manner as described above, the friction characteristics, workability, compatibility, mold release properties, mold contamination, and mold shrinkage of the obtained molded product were evaluated. Table 4 shows the evaluation results.

Examples 4 to 6 In Examples 1 to 3, an ABS resin [trade name: HM-1100, manufactured by Ube Sicon Co., Ltd.] was used instead of the polyacetal resin.
Except for using [1], in the same manner as in Examples 1 to 3, the friction characteristics, workability, compatibility, mold release properties,
The mold contamination and the molding shrinkage were evaluated. Table 4 shows the evaluation results.

Comparative Example 3 The procedure of Example 4 was repeated, except that the liquid oxidation-modified ethylene / propylene copolymer was not used.
The friction characteristics, workability, compatibility, mold release properties, mold contamination, and mold shrinkage of the obtained molded product were evaluated. Table 4 shows the evaluation results.

Comparative Example 4 Example 4 was repeated except that an unmodified liquid ethylene / propylene random copolymer (ethylene unit content 52 mol%, number average molecular weight Mn 5220, Mw / Mn 1.7) was used. In the same manner as described above, the friction characteristics, workability, compatibility, mold release properties, mold contamination, and mold shrinkage of the obtained molded product were evaluated. Table 4 shows the evaluation results.

Examples 7 to 9 In the same manner as in Examples 1 to 3, except that a polyamide resin (trade name: UBE nylon 1013B, manufactured by Ube Industries, Ltd.) was used instead of the polyacetal resin. The friction characteristics, workability, compatibility, mold release properties, mold contamination, and mold shrinkage of the obtained molded product were evaluated. Table 4 shows the evaluation results.

Comparative Example 5 In the same manner as in Example 7, except that the liquid oxidation-modified ethylene / propylene random copolymer was not used, the friction characteristics, processability, compatibility,
The mold releasability, mold contamination, and molding shrinkage were evaluated. Table 4 shows the evaluation results.

[0058]

[Table 4]

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Claims (6)

[Claims] 1. (A) selected from the group consisting of polyacetal resin, ABS resin, polyamide resin, polyphenylene oxide resin, polyimide resin, thermoplastic polyester resin, polycarbonate resin, epoxy resin, thermosetting unsaturated polyester resin and phenol resin. 100 parts by weight of one kind of the resin and (B) (i) ethylene-α-olefin in which the ethylene unit accounts for 20 to 80 mol% and the α-olefin unit accounts for 20 to 80 mol% of all the structural units.
Oxidized modified olefin random copolymer, (i
i) the number average molecular weight Mn is 500 to 10,000, (ii)
i) Liquid oxidation-modified ethylene / α-olefin random copolymer having a molecular weight distribution (Mw / Mn) of 1.2 to 0.3.
A molding resin composition comprising 1 to 10 parts by weight. 2. The liquid oxidation-modified ethylene / α-olefin random copolymer (B) has an oxygen content of 0.1 to 20% by weight, an acid value of 0.1 to 50 mg KOH / g and a saponification value of 0.1 to 50%. The molding resin composition according to claim 1, wherein the amount is 100 mgKOH / g. 3. The molding resin composition according to claim 1, wherein the liquid oxidation-modified ethylene / α-olefin random copolymer (B) is an oxidation-modified ethylene / propylene random copolymer. 4. The molding resin composition according to claim 1, wherein the resin (A) is a polyacetal resin. 5. The resin according to claim 1, wherein the resin (A) is an ABS resin.
4. The molding resin composition according to any one of the above items 3. 6. The molding resin composition according to claim 1, wherein the resin (A) is a polyamide resin.