JPS6250357A - Interior finish component for automobile - Google Patents

Abstract

PURPOSE:To provide the titled interior finish component having excellent moldability and resistance to heat and light, by molding a resin compsn. consisting of two copolymers mainly composed of an arom. vinyl compd. and two graft polymers mainly composed of an arom. vinyl compd. CONSTITUTION:15-65pts.wt. copolymer (A) composed of 80-50% (by mol; the same applies hereinbelow) of a residue of component (a), 20-50% of a residue of component (b) and 0-30% of a residue of component (c) obtd. by copolymerizing an arom. vinyl compd. (a), a maleimide compd. (b) and other copolymerizable vinyl compd. (c), 0-50pts.wt. copolymer (B) composed of 90-40% of a residue of component (a) and 10-60% of a residue of component (d), obtd. by copolymerizing component (a) and a vinyl cyanide compd. (d), 10-50pts.wt. graft polymer (C) composed of 25-70wt% component (e) obtd. by emulsion-polymerizing components (a) and (d) in the presence of an elastomeric rubber latex having an average particle size of 0.1-0.5mu and 75-30wt% copolymer (f) composed of 90-40% of a residue of component (a) and 10-60% of a residue of component (d) and 4-30pts.wt. graft copolymer (D) composed of 5-17wt% component (e) having an average particle size of 0.7-4.0mu and 95-83wt% component (f) are blended together.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to automobile interior parts, and particularly to automobile interior parts having excellent heat resistance, light resistance, and moldability. Here, the automotive interior parts include meter hoods, defroster garnishes, register bezels, clusters, instrument panels, speaker grilles, ceiling fittings, and the like.

<Prior art> As a molding material for automobile interior parts that require high heat resistance (deflection temperature under load of 100°C or higher, according to J15K7207) as described above, ultra-heat-resistant ABS resin (hereinafter referred to as ultra-heat-resistant ABS) is used. ) or polyphenylene oxide (abbreviated) or polyphenylene oxide (
(hereinafter abbreviated as PPO) was used.

<Problems to be solved by the invention> Here, am heat ABS has good light resistance and moldability, but it is difficult to satisfy the heat resistance equivalent to a deflection temperature under load of 105°C or higher □ As heat resistance improves, The moldability was □.

Furthermore, although PPO exhibits a high degree of heat resistance equivalent to a deflection temperature under load of 110°C or higher, it has poor light resistance and requires painting when used as interior parts for automobiles, and furthermore, it does not have good moldability. .

<Object of the Invention> In view of the above, an object of the present invention is to provide an automobile interior part that is excellent in all of heat resistance, light resistance, and moldability.

Means for Solving the Problems In order to solve the above problems, the present inventors have made extensive efforts in development and have developed a styrene-maleimide compound proposed in JP-A No. 59-232138. The present invention has been completed by discovering that a resin composition consisting of a polymer and a graft type ABS resin may have the following structure in which the maleimide component and the rubber elastomer component are specified.

Each copolymer (A), (B), (C) with the following specifications
, (D), the composition of which is (A) 15 to 65 parts by weight, (B) 0 to 50 parts by weight, (C) tO to 50 parts by weight,
(D) An automobile interior part molded from 4 to 30 parts by weight of a resin composition.

(A) Vinyl aromatic compound residue 80-50 mol%
Copolymer (B) consisting of maleimide compound residues 20-50 mol% vinyl compound residues that can be copolymerized with these 0-30 mol% vinyl aromatic compound residues 90-40 mol%
Copolymer (C) (1) consisting of 10 to 60 mo1% of vinyl cyanide compound residue (1) Rubber elastic body with an average particle size of 0.1 to 0.5 p-m (glass transition temperature 1°C or less) 25 to 70 wt% (2
) Copolymer consisting of vinyl aromatic compound residue 90-40mol1% vinyl cyanide compound residue 10-60molX Graft copolymer (D) (1) Average particle size 0.7-4. Copolymer consisting of Op, ta rubber elastic body (glass transition temperature 1°C or less) 5-17 wt$0 vinyl aromatic compound residue 80-40 mol% vinyl cyanide compound residue 10-60 mol%
Remainder: Description of each structure of the graft copolymer consisting of the following: In this specification, the content of compound residues in each copolymer is expressed as a molar ratio of the number of residues.

Specific examples of each compound used in the present invention are as follows.

■Vinyl aromatic compounds: ethylene, α-methylstyrene, P-methylstyrene, 1-butylstyrene, halogenated styrene, or mixtures thereof ■Maleimide compounds: N-phenylmaleimide, maleimide, N-furkylmaleimide , N-aromatically derived maleimide or mixtures thereof.

■Vinyl compounds copolymerizable with the above ■ and ■: acrylonitrile, acrylic esters, methacrylic esters, maleic anhydride, or mixtures thereof.

■ Vinyl cyanide compound: acrylonitrile, methacrylonitrile, or a mixture thereof.

■Rubber elastic material: polybutadiene; styrene-butadiene copolymer; acrylonitrile-butadiene copolymer; acrylic acid ester polymers such as butyl acrylate, pentyl acrylate, hexyl acrylate; ethylene-propylene copolymer; ethylene-propylene number Non-conjugated diene terpolymer.

Copolymers (A) and (B) are produced by blending each of the above compounds in predetermined amounts and performing bulk polymerization, suspension polymerization, or bulk-feel polymerization. If the amount of maleimide compound residue in the copolymer (A) is less than 20 o 1%, it is difficult to obtain a high degree of heat resistance (deflection under load of 105°C or more once) in the molded amount,
If it exceeds 0mo1%, manufacturing becomes difficult.

The copolymer (C) is usually produced by emulsion polymerization of a vinyl aromatic compound and a vinyl cyanide compound in the presence of a rubber elastomer latex. The average particle size of the rubber elastic body is 0.1
If it is less than μm, the mechanical properties such as impact resistance of the molded article will deteriorate, and if it exceeds 0.5 pm, emulsion polymerization will become difficult. If the amount of the rubber elastic body is less than 25 wt%, problems will occur in impact resistance, moldability, etc., and if it exceeds 70 wt%,
Blending with other copolymers is difficult and surface gloss is poor.

The copolymer (D) is produced by bulk polymerization or bulk-suspension polymerization of a rubber elastic body dissolved in a vinyl aromatic compound or vinyl cyanide compound. If the average particle size of the rubber elastic body is less than 0.74 m, the molded product will not have sufficient impact resistance, and if it exceeds 4 pm, moldability will decrease, gloss will decrease, and flow marks will easily occur. . When the amount of the rubber elastic body is less than 5 wt%, problems tend to occur in the impact resistance of the molded product, and when it exceeds 17 wt%, it becomes difficult to control the polymerization reaction.

The composition of the resin composition used in the automotive interior parts of the present invention is as described above, but if the copolymer (A) is less than 15 parts, sufficient heat resistance (deflection temperature under load of 105°C or higher) cannot be obtained. If the amount exceeds 65 parts by weight, the copolymer (C
), (D) is less than each lower limit numerical value, it is difficult to obtain sufficient impact resistance, and the copolymer (B), D:), (
When D) exceeds each upper limit value, it is difficult to obtain sufficient heat resistance.

In addition, the above resin composition may contain commonly used compounding agents, such as antioxidants, ultraviolet absorbers, #type agents,
Adding antistatic agent, coloring agent, etc. (Effect of the invention) As described above, the automotive interior parts of the present invention contain a specific styrene-maleimide copolymer and a graft type ABS resin composition in which a maleimide component and rubber are added. By molding the elastomer from specified elastomer components, it has sufficient heat resistance, excellent moldability, and excellent light resistance, as shown in Examples below. In other words, the automotive interior parts of the present invention have better moldability than PPO molded products (equivalent to ABS molded products), so they can be molded at a lower temperature than PPO molded products, and are suitable for thin products and It can be applied to objects with complex shapes and has good light resistance (equivalent to ABS molded products), so it can be used repeatedly even without painting.

<Examples> Hereinafter, the present invention will be explained in more detail with reference to Examples. Various physical properties of the molded article were measured by the following methods.

(1) l@thermal (load deflection temperature;) IDT)...J
ISK7207 (2) Impact resistance (Izod)...JIS
K7110 (3) Formability (Spiral flow; 5piral)
...Injection pressure 70 kgf/aI', cylinder temperature 270
11 was added based on the distance through which the material flows when the material is supplied to a spiral cavity having a constant cross section of 2 layers x 6 angles of inclination under the conditions of .degree.

MlJ & products having the specifications shown in Table 1 were polymerized by the conventional method described above to obtain each copolymer (A), (B), (C),
(D-1) and (D-2) were obtained.

Then, each copolymer was kneaded at the blending ratio shown in Table 2 to form a pellet material, and a molded article (test piece) was obtained from the pellet material by injection.

From the test results shown in Table 2, it is clear that the automotive interior parts according to the present invention: 1) are not easily deformed even at high temperatures; and 2) have excellent impact resistance.

Claims (1)

[Claims] Each copolymer (A), (B), (C), (D) with the following specifications
The composition is (A) 15-65 parts by weight, (B) 0-65 parts by weight.
50 parts by weight, (C) 10 to 50 parts by weight, (D) 4 to 30 parts by weight
An interior part for an automobile, characterized in that it is molded from a resin composition that is part by weight. (A) 80 to 50 mol% of vinyl aromatic compound residues 20 to 50 mol% of maleimide compound residues 0 to 30 mol% of vinyl compound residues copolymerizable with these (B) 90 mol% of vinyl aromatic compound residues ~40 mol% Copolymer (C) consisting of 10 to 60 mol% of vinyl cyanide compound residue (1) Rubber elastic body with average particle size of 0.1 to 0.5 μm (glass transition temperature 1° C. or lower) 25 to 70 wt% (2) Graft copolymer (D) consisting of a copolymer consisting of 90 to 40 mol% of vinyl aromatic compound residues and 10 to 60 mol% of vinyl cyanide compound residues (1) Average particle size of 0.7 to 4 .0 μm rubber elastic body (glass transition temperature 1°C or less) 5 to 17 wt% (2) copolymer consisting of 90 to 40 mol% of vinyl aromatic compound residues and 10 to 60 mol% of vinyl cyanide compound residues; remainder; graft copolymer