JPH04370128A - Thermoplastic resin composition - Google Patents

Abstract

PURPOSE:To provide a resin composition composed mainly of an olefinic resin and an acrylonitrile-styrene (AN-St) copolymer and having improved compatibility and excellent surface characteristics and various mechanical properties. CONSTITUTION:The objective thermoplastic resin composition contains (A) an olefinic resin, (B) an AN-St copolymer and further (C) 5-100 pts.wt. of an AES resin based on 100 pts.wt. of the sum of the components A and B.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin composition containing an olefin resin and an acrylonitrile-styrene copolymer, which can be used as a material for various molded products such as automobile parts, furniture, and electrical appliances.

0002

BACKGROUND OF THE INVENTION Olefin resins have excellent mechanical strength, moldability, chemical resistance, etc., and are widely used in various industrial fields such as interior and exterior parts of automobiles, home appliance parts, and housings. However, since polyolefin is a non-polar molecule, it has difficulties in secondary processability, especially in solid phase adhesion and paintability. As a method for improving such olefin resins, blending polystyrene with good adhesiveness with the olefin resin has been carried out.

[0003] In particular, styrene-acrylonitrile copolymer has excellent chemical resistance, strength, and heat resistance among polystyrene resins, so blends of it and olefin resins are expected to exhibit various favorable properties. has been done.

However, since olefin resins and polystyrene resins do not have good compatibility, blends thereof have a problem in that physical properties, particularly surface peeling resistance, are significantly reduced.

[0005] Therefore, various compositions have been proposed in which a compatibilizer is added to a composition of polypropylene resin and polystyrene resin for the purpose of improving the compatibility thereof (Japanese Patent Application Laid-Open No. 1983-1999). Publication No. 87945, JP-A-1-
174550). All of the above compositions contain a styrene-nonconjugated diene block copolymer or the like as a compatibilizing agent for the polypropylene resin and the polystyrene resin.

[0006]

[Problems to be Solved by the Invention] However, although the above-mentioned compatibilizers are effective to some extent in making polypropylene resins and polystyrene resins compatibilizing, they are not compatible with polypropylene resins and styrene-acrylonitrile copolymers. The problem is that solubilization has almost no effect.

As described above, it has not been possible to obtain a composition in which the olefin resin and the styrene-acrylonitrile copolymer are well compatible.

[0008] Accordingly, the present invention aims to achieve good compatibility between the olefin resin and the acrylonitrile-styrene (hereinafter sometimes referred to as AN-St) copolymer, thereby improving surface properties,
Olefin resin and AN-S with excellent mechanical properties
An object of the present invention is to provide a thermoplastic resin composition containing a t-based copolymer as a main component.

[0009]

[Means for Solving the Problems] The thermoplastic resin composition of the present invention comprises (A) 5 to 95 parts by weight of an olefin resin;
and (B) acrylonitrile-styrene copolymer
(A) a copolymer containing 95 to 5 parts by weight, and (C) (a) a polymer or copolymer component containing an olefin, (b) a styrene monomer component, and (c) an acrylonitrile monomer component. and (B) total 1
It is characterized by containing 5 to 100 parts by weight per 00 parts by weight.

The olefin resin used in the present invention is ethylene, propylene, butene, 4-methylpentene-1
It includes all known olefin resins, such as homopolymers of α-olefin monomers such as, copolymers of these, copolymers of these with dienes, and hydrogenated products thereof. In the case of copolymers, block copolymers,
Any random copolymer is included. Preferably, it is a crystalline polymer polymerized with an olefin monomer as a main component, and contains up to about 40% by weight of ethylene, butene, 4-
It may also be copolymerized with other α-olefins such as methylpentene-1. The above copolymer is a random copolymer,
Any block copolymer may be used.

[0011] Furthermore, the general formula (chemical formula 1):

0012

Formula 1 Olefin random copolymers containing conjugated diene comonomers can also be used.

Next, the acrylonitrile-styrene (AN-St) copolymer used in the present invention is a random copolymerization of repeating units derived from acrylonitrile and repeating units derived from styrene. . The content of acrylonitrile is usually 2 to 50% by weight based on the entire AN-St copolymer as 100% by weight,
Preferably it is 20 to 30% by weight.

[0014] Such an AN-St copolymer has a melt flow rate (MFR) of 1 to 60 g/10 min, and a weight average molecular weight (Mw) of 10,000 to 1
,000,000 is preferred.

The above components (A) and (B) are (A
) 5 to 95 parts by weight (B) 95 to 5 parts by weight, preferably (A) 10 to 90 parts by weight to (B) 90 to 1
It is used in a proportion of 0 parts by weight.

Next, in the present invention, in addition to the above (A) and (B), (C) (a) an olefin-containing polymer or copolymer component, (b) a styrene monomer component, and (c) ) 5 to 100 parts by weight, preferably 10 to 30 parts by weight, of a copolymer containing an acrylonitrile monomer component, based on a total of 100 parts by weight of (A) and (B). If the amount of (C) is less than 5 parts by weight, a sufficient compatibilizing effect will not be obtained, and if it is more than 100 parts by weight, the rigidity of the entire composition will decrease. (a) Polymers or copolymers containing olefins include polymers of olefinic monomers such as ethylene, propylene, butene, and pentene, or copolymers of these olefinic monomers, such as ethylene-propylene copolymers; olefins; Copolymers of type monomers and dienes, such as ethylene-propylene-diene copolymers (dienes include ethylidenenorbornene,
(1,4-hexadiene); Copolymers of olefinic monomers and acrylic esters, such as ethylene-butyl acrylate. (b) Examples of the styrene monomer include styrene, methylstyrene, chlorostyrene, etc., and one or more of these may be used. (c) Examples of the acrylonitrile monomer include acrylonitrile and methacrylonitrile, and one or more of these may be used. The composition ratio of each component (a), (b) and (c) is not particularly limited, and each component is blended according to the intended use. The copolymer containing the above components (a), (b), and (c) may be a random copolymer, a block copolymer, or a graft copolymer, but (a) contains an olefin. A graft copolymer obtained by graft polymerizing (b) a styrene monomer and (c) an acrylonitrile monomer to a polymer or copolymer component is preferred.

Copolymer of component (C), namely (a),
Specific examples of copolymers containing (b) and (c) include acrylonitrile-ethylene-propylene-styrene copolymers, acrylonitrile-ethylene-propylene-diene-styrene copolymers, and the like.

In addition to the above-mentioned components, the resin composition of the present invention may contain conventional additives such as pigments, dyes, fillers (such as inorganic fillers, glass fibers, etc.), reinforcing materials, heat stabilizers, and light stabilizers. Agents, antioxidants, plasticizers, flame retardants, antistatic agents, mold release agents, foaming agents, nucleating agents, etc. can be added.

The resin composition of the present invention can be produced by melt-kneading the above-mentioned components. The melt-kneading temperature is usually 200 to 300°C, preferably 23°C.
0 to 250°C. The equipment used for melt kneading is
It can be carried out using conventional equipment such as single or twin screw extruders, Banbury mixers, kneading rolls, Brabenders, kneaders, Henschel mixers, batch kneaders and the like.

[0020]

[Function] Since the thermoplastic resin composition of the present invention contains component (C), the (a) olefin-containing polymer or copolymer component in (C) has an affinity with (A) olefin resin. is good, and since the styrene moiety and acrylonitrile moiety in (C) are compatible with the acrylonitrile-styrene copolymer of component (B), (C)
acts as a compatibilizer for the (A)/(B) blend. It is presumed that such a mechanism improves the compatibility of (A) and (B).

[0021]

EXAMPLES The present invention will be explained in more detail with the following examples.

[0022] The raw materials used in each example and comparative example are as follows. 1. Olefin resin (1-1) Polypropylene homopolymer (PP): J
209 (manufactured by Tonen Chemical Co., Ltd.), MFR 9.0g/
10 minutes (1-2) Ethylene-propylene block copolymer (BPP): BJ309 (manufactured by Tonen Chemical Co., Ltd.),
MFR 9.0g/10min, ethylene content 7.5% by weight2. Acrylonitrile-styrene copolymer (AS
) (2-1) Acrylonitrile-styrene random copolymer ■ (AS■): AS230 (manufactured by Japan Synthetic Rubber Co., Ltd.), MFR 6.62 g/10 minutes, acrylonitrile content 25% by weight (2-2) Acrylonitrile- Styrene random copolymer ■ (AS■): AS290ZF (manufactured by Japan Synthetic Rubber Co., Ltd.), MFR 20.0 g/10 minutes, acrylonitrile content 32% by weight 3. Acrylonitrile-ethylene-propylene-styrene copolymer (AES) (3-1) Acrylonitrile-ethylene-propylene-styrene resin ■ (AES■): AES110 (manufactured by Japan Synthetic Rubber Co., Ltd.) (3-2) Acrylonitrile-ethylene -Propylene-styrene resin ■ (AES■): AES117 (manufactured by Japan Synthetic Rubber Co., Ltd.) 4. Acrylonitrile-butadiene-styrene resin (A
BS): ABS-10 (manufactured by Japan Synthetic Rubber Co., Ltd.), M
FR 10g/10min, acrylonitrile content (acrylonitrile-styrene as 100% by weight) 25
Weight % Examples 1 to 6 and Comparative Examples 1 to 2 Each component was mixed at room temperature in the proportions (weight %) shown in Table 1 using a Henschel mixer, and then mixed at 250°C using a twin-screw kneader with a diameter of 45 mm. Kneading was performed at 200 rpm, and the extrudate was rapidly cooled in water to obtain pellets of the thermoplastic resin composition.

[0023] Regarding the obtained resin composition, MFR, surface peeling resistance, Izod impact strength (JIS K711
0, measured at -30℃), tensile strength (JIS K7
113), elongation at break (JIS K7113), flexural modulus (JIS K7203) and heat distortion temperature (HD
T) (JIS K7207) was measured.

[0024] The surface peeling resistance is determined by
100 squares of mm2 were made, and a tape peeling test was performed on the parts, and evaluation was made based on the number of squares that remained without peeling out of the 100 squares. The results are shown in Table 1.

[0025]

[Table 1]

[Effects of the Invention] According to the present invention, a resin mainly composed of an olefin resin and an acrylonitrile-styrene copolymer has improved compatibility and has excellent surface properties such as surface peel strength and various mechanical properties. A composition can be provided.

Claims (1)

[Claims] Claim 1: (A) Olefin resin 5-95
parts by weight, and (B) 95 to 5 parts by weight of an acrylonitrile-styrene copolymer, and (C) (a)
an olefin-containing polymer or copolymer component, (b)
(A) and (B) a copolymer containing a styrene monomer component and (c) an acrylonitrile monomer component.
A thermoplastic resin composition comprising 5 to 100 parts by weight based on a total of 100 parts by weight.