JP2747738B2 - Thermoplastic resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a thermoplastic resin composition having excellent clarity and excellent heat resistance, chemical resistance and impact resistance.

<Conventional technology> Styrene resins such as polystyrene, styrene-acrylonitrile copolymer, ABS resin, EPDM rubber as rubber component, AES resin using acrylic rubber, and AAS resin have excellent physical property balance and dimensional stability. And is used in a wide range of fields. Among them, there are many applications in the field of automobiles. However, in this case, chemical resistance such as gasoline resistance and brake oil resistance has always been a problem, and improvement in this aspect has been an important issue. On the other hand, a saturated polyester resin is already known as a polymer having excellent chemical resistance, but it has been proposed to mix an ABS resin with a saturated polyester resin because of its poor impact resistance (Japanese Patent Publication Nos. Sho 47-30421 and Sho No. 51). -25261).

<Problems to be Solved by the Invention> However, a composition comprising an ABS resin and a saturated polyester resin has a problem that the impact resistance is not sufficient and the heat resistance is poor.

Further, these compositions are coated for the purpose of decoration or improvement of weather resistance, but at that time, there is a problem that the sharpness of the coated surface is also poor.

<Means for Solving the Problems> As a result of earnestly studying the improvement of the above-mentioned quality problems of the composition comprising the rubber-reinforced styrene resin and the saturated polyester resin, the present inventor has found that the rubber-reinforced styrene resin,
The present inventors have found that a composition comprising a saturated polyester resin and two specific copolymers has excellent image clarity and excellent heat resistance, impact resistance, and chemical resistance, and has reached the present invention.

That is, the present invention provides (A) a rubber obtained by graft-polymerizing an aromatic vinyl compound (ii) with a vinyl cyanide compound and / or another vinyl compound (iii) in the presence of a rubbery polymer (i). 10 to 85% by weight of a reinforced styrene resin, (B) 5 to 50% by weight of a saturated polyester resin, and (C) α-methylstyrene (i), a vinyl cyanide compound (ii) and, if necessary, an aromatic vinyl compound (Excluding α-methylstyrene) and / or 100 parts by weight of a composition comprising 10 to 70% by weight of an α-methylstyrene-based copolymer comprising an unsaturated carboxylic acid alkyl ester compound (iii), (D) an olefin ( An epoxy group-containing olefin copolymer comprising i) and an epoxy group-containing unsaturated compound or an epoxy group-containing unsaturated compound and a vinyl ester of a saturated carboxylic acid having 2 to 6 carbon atoms (ii) is used. It is intended to provide a thermoplastic resin composition which is blended by weight and has a rubbery polymer content of 5 to 25% by weight in the composition (A + B + C + D).

Rubber-reinforced styrenic resin A rubber-reinforced styrenic resin is obtained by graft polymerization of an aromatic vinyl compound (ii) with a vinyl cyanide compound and / or another vinyl compound (iii) in the presence of a rubbery polymer (i). It is a resin obtained by:

Rubbery polymer (i), aromatic vinyl compound (ii) and compound (ii) in rubber-reinforced styrenic resin
The composition ratio of i) is not particularly limited, but is preferably 10 to 70% by weight of a rubbery polymer, 15 to 70% by weight of an aromatic vinyl compound, and 5 to 50% by weight of a compound.

As the rubbery polymer, polybutadiene, styrene-
Examples thereof include a butadiene copolymer, an acrylonitrile-butadiene copolymer, an ethylene-propylene-based copolymer, an acrylate-based copolymer, and chlorinated polyethylene, which can be used alone or in combination of two or more. These rubbery polymers are produced by emulsion polymerization, solution polymerization, suspension polymerization, bulk polymerization or the like. The particle size and gel content of the rubbery polymer in the case of production by emulsion polymerization are not particularly limited, but are preferably 0.1 to 1 μm in average particle size and 0 to 95% in gel content.

Examples of the aromatic vinyl compound include styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene,
p-methylstyrene, t-butylmethylene, α-methylvinyltoluene, dimethylstyrene, chlorostyrene,
Examples thereof include dichlorostyrene, bromostyrene, dibromostyrene, and vinylnaphthalene, which can be used alone or in combination of two or more. Particularly, styrene and α-methylstyrene are preferred.

The other vinyl compounds constituting the rubber-reinforced styrenic resin together with the rubbery polymer and the aromatic vinyl compound,
Unsaturated nitrile compounds such as acrylonitrile, methacrylonitrile, fumaronitrile, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-
Unsaturated carboxylic acid alkyl ester compounds such as ethylhexyl (meth) acrylate and the like, each of which can be used alone or in combination of two or more. Particularly, an unsaturated nitrile compound is preferable.

Although the graft ratio in the graft polymer is not limited, it is preferably 25 to 150%. As a method for polymerizing the graft polymer and the copolymer, a known emulsion polymerization, suspension polymerization, bulk polymerization, solution polymerization, or a combination thereof can be used.

Saturated polyester resin (B) As the saturated polyester resin used in the present invention,
Examples include polyethylene terephthalate, polybutylene terephthalate, polyester-ether block polymers having a polyester hard segment and a polyether soft segment, and are synthesized from 1,4 butanediol and terephthalic acid or dimethyl terephthalate and ethylene glycol. These can be used alone or in combination of two or more. Particularly, polybutylene terephthalate is preferred.

α-Methylstyrene-based copolymer (C) The α-methylstyrene-based copolymer includes α-methylstyrene (i), a vinyl cyanide compound (ii), and an aromatic vinyl compound (α-methyl Excluding styrene)
And / or an unsaturated carboxylic acid alkyl ester compound (iii).

The composition of the α-methylstyrene-based copolymer is not particularly limited, but α-methylstyrene (i) is 60 to 85% by weight, vinyl cyanide compound (ii) is 15 to 40% by weight, and other compounds are 0 to 25%. % By weight.

The intrinsic viscosity (dimethylformamide solution, 30 ° C.) of the α-methylstyrene copolymer is preferably from 0.3 to 1.0.

As the compounds constituting the α-methylstyrene-based copolymer, the same compounds as described in the section of the rubber-reinforced styrene-based resin (A) can be mentioned.

Examples of the method for producing the α-methylstyrene-based copolymer include an emulsion polymerization method, a suspension polymerization method, a solution polymerization method, and a bulk polymerization method.

Epoxy group-containing olefin copolymer (D) The epoxy group-containing olefin copolymer is an olefin (i) with an epoxy group-containing compound or an epoxy group-containing compound and a vinyl ester of a saturated carboxylic acid having 2 to 6 carbon atoms (ii) ).

The composition of the epoxy group-containing olefin copolymer is not particularly limited, but is 99.95 to 5% by weight of an olefin, 0.05 to 95% by weight of an epoxy group-containing compound, and 0 to 40 vinyl esters of a saturated carboxylic acid having 2 to 6 carbon atoms. % By weight, particularly 99 to 50% by weight of an olefin, 1 to 50% by weight of an epoxy group-containing compound and 0 to 30% by weight of a vinyl ester of a saturated carboxylic acid having 2 to 6 carbon atoms.

Examples of the olefin include ethylene, propylene, butene-1, 4-methylpentene-1, and the like, and they may be used alone or in combination of two or more. Particularly, ethylene is preferred.

The epoxy group-containing compound is a compound having an unsaturated group capable of copolymerizing with an olefin and a vinyl ester of a saturated carboxylic acid having 2 to 6 carbon atoms in the molecule and an epoxy group.

For example, unsaturated epoxy compounds such as unsaturated glycidyl esters, unsaturated glycidyl ethers, epoxyalkenes and P-glycidylstyrenes represented by the following general formulas (I), (II) and (III). .

(R is a C _2-18 hydrocarbon group having an ethylenically unsaturated bond.) (R is a C _2-18 hydrocarbon group having an ethylenically unsaturated bond. X is —CH ₂ —O—, (R is a C _2-18 hydrocarbon group having an ethylenically unsaturated bond; R ′ is hydrogen or a methyl group.) Specifically, glycidyl acrylate, glycidyl methacrylate, glycidyl itaconate, Butenecarboxylic acid esters, allyl glycidyl ether, 2
-Methylallyl glycidyl ether, styrene-P-glycidyl ether, 3,4-epoxybutene, 3,4-epoxy-3-methyl-1-butene, 3,4-epoxy-1-pentene, 3,4-epoxy- Examples thereof include 3-methylpentene, 5,6-epoxy-1-hexene, vinylcyclohexene monoxide, and P-glycidylstyrene, and they can be used alone or in combination of two or more. Glycidyl (meth) acrylate is particularly preferred.

Vinyl acetate of a saturated carboxylic acid having 2 to 6 carbon atoms includes vinyl acetate.

Epoxy group-containing olefin copolymers can be made by various methods. For example, an unsaturated epoxy compound and an olefin, and in some cases, a vinyl ester of a saturated carboxylic acid having 2 to 6 carbon atoms are converted to 50 to 40 in the presence of a radical generator.
A method of contacting at 00 atm and 40 to 300 ° C .; a method of mixing a polypropylene with an unsaturated epoxy compound and irradiating gamma rays under a high vacuum to produce a polymer.

Thermoplastic resin composition The composition of the present invention comprises 10 to 85% by weight of the above-mentioned rubber-reinforced styrene resin (A) and 5 to 5% of a saturated polyester resin (B).
50% by weight and α-methylstyrene copolymer (C) 10
An epoxy group-containing olefin copolymer (D) is compounded in an amount of 0.2 to 50 parts by weight per 100 parts by weight of a composition of 70 to 70% by weight, and the rubbery polymer content in the composition (A + B + C + D) is 5 to 5%. 25% by weight of the composition.

Outside this range, a composition having excellent clarity, heat resistance, impact resistance and chemical resistance cannot be obtained. (A) 20-70% by weight, (B) 10
It is preferable that the content of (C) is 20 to 50% by weight, (D) is 1 to 20% by weight (A + B + C is 100% by weight), and the rubbery polymer content is 10 to 20% by weight.

There are no restrictions on the order of mixing and the state of the rubber-reinforced styrene resin (A), the saturated polyester resin (B), the α-methylstyrene copolymer (C) and the epoxy group-containing olefin copolymer (D). , Pellets, beads,
Examples of the method include the simultaneous simultaneous mixing of the four components (A), (B), (C) and (D) in a form such as a powder, and the mixing of the components remaining after the specific components are preliminarily mixed. As a mixing method, a known method such as a Banbury mixer, a roll, or an extruder can be adopted.

In addition, antioxidants, ultraviolet absorbers, light stabilizers, antistatic agents, lubricants, dyes, pigments, plasticizers, flame retardants, mold release agents, glass fibers, metal fibers, carbon fibers, metals Additives such as flakes, reinforcing materials, and fillers can be added. In addition, a thermoplastic resin such as polyacetal, polycarbonate, polyamide, polyphenylene oxide, polymethyl methacrylate, or polyvinyl chloride can be appropriately compounded.

Next, the present invention will be specifically described by reference examples, examples and comparative examples, but the present invention is not limited by these. It should be noted that the number of copies and the percentage are shown on an important basis.

Reference Example-1 Rubber-reinforced styrene-based resin (A) Various resins were obtained based on the compositions shown in Table-1.

Reference Example-2 Polyester resin (B) B: Polybutylene terephthalate (PBT) Viscosity average molecular weight 30,000 Reference Example-3 α-methylstyrene copolymer (C) Various copolymers were prepared based on the composition shown in Table-2. Obtained.

Reference Example-4 Epoxy group-containing olefin copolymer (D) Various copolymers were obtained based on the composition shown in Table-3.

Examples Tables (A) to (D) obtained in Reference Examples 1 to 4 are shown below.
The composition shown in Fig. 4 was kneaded at a time to obtain various compositions.

 Table 4 shows the physical properties of the composition obtained.

 The test method is as follows.

1) Impact strength ASTM D-256, 1/4 inch, notched Izod 2) Heat resistance ASTM D-648, 1/4 inch, 18.6kg / cm ² load 3) Chemical resistance 150mm x 20mm x 3mm test piece And test the test piece for 1.5
Dioctyl phthalate was applied under% strain, and after 48 hours in an 80 ° C. oven, the presence or absence of cracks was determined.

4) Sharpness A flat plate of 90 mm × 150 mm × 3 mm is formed by an injection molding machine, and a urethane-based coating “Hi Urethane 5100” manufactured by NOF CORPORATION is coated on the flat plate with a spray gun for 30 μm. It painted so that it might become.

The coated molded product was baked in an oven at 65 ° C. for 30 minutes, and used for evaluation of sharpness hereinafter.

The sharpness of the painted surface was measured at an incident angle of 60 degrees using an image clarity measuring device "ICM-ID" manufactured by Suga Test Instruments Co., Ltd.

The metal bar on the straight line was stopped in a space of about 10 mm above the painted surface, and the sharpness of the metal bar reflected on the painted surface was visually judged.

：: The metal bar is sharply projected on the painted surface in a straight line, and good. ×: The metal bar is blurred in a wavy shape and is poorly projected. <Effects of the Invention> As described above, the resin composition of the present invention has excellent clarity, and excellent balance of physical properties such as impact resistance, heat resistance, and chemical resistance, and is industrially very useful. It is.

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Claims (1)

(57) [Claims] 1. An aromatic vinyl compound (ii) and a vinyl cyanide compound and / or (A) a rubbery polymer (i).
Or 10 to 85% by weight of a rubber-reinforced styrene resin obtained by graft polymerization of another vinyl compound (iii), (B) 5 to 50% by weight of a saturated polyester resin, and (C) α-methylstyrene (i), cyan Α-methylstyrene-based copolymer consisting of a vinyl chloride compound (ii) and, if necessary, an aromatic vinyl compound (excluding α-methylstyrene) and / or an unsaturated carboxylic acid alkyl ester compound (iii), in an amount of 10 to 70% by weight Per 100 parts by weight of a composition consisting of (D) an olefin (i), an epoxy group-containing unsaturated compound or an epoxy group-containing unsaturated compound, and vinyl esters (ii) of a saturated carboxylic acid having 2 to 6 carbon atoms. The composition is characterized in that it contains 0.2 to 50 parts by weight of an epoxy group-containing olefin copolymer, and the rubbery polymer content in the composition (A + B + C + D) is 5 to 25% by weight. Plastic resin composition.