Polyplastics Co., Ltd.

Hiroki Arai

Tomohiro Monma

Yuuki Kanda

Katsuhei Ohnishi

Raita Nishikawa

Yoshihito Fukasawa

Tatsuya Kanezuka

Kuniaki Matsuda

Takashi Fujita

A casing member for an in-vehicle camera, obtained by injection molding a resin composition that comprises 100 to 300 parts by mass of a total of a fibrous inorganic filler and a non-fibrous inorganic filler to 100 parts by mass of a polyarylene sulfide resin and has a content of an elastomer of 10% by mass or less, and satisfying the following conditions (A) and (B). (A) When a molded product of a predetermined shape is injection molded using the resin composition under predetermined conditions, an absolute value of (shrinkage rate in a direction perpendicular to a flow direction)−(shrinkage rate in the flow direction) is 0.5% or less. (B) A water absorption rate of a molded product of a predetermined shape that is injection molded using the resin composition under predetermined conditions is 0.3% or less when subjected to a predetermined hot water immersion test.

Casing member for in-vehicle camera and method of manufacturing the same

A polyacetal resin composition contains a polyacetal copolymer resin (A) in an amount of 100 parts by mass, the polyacetal copolymer resin having a hemiformal terminal group amount of 0.8 mmol/kg or less, a hindered phenol-based antioxidant (B) in an amount of 0.2 to 2.0 parts by mass, at least one of magnesium oxide or zinc oxide (C) in an amount of more than 2.0 parts by mass and 20 parts by mass or less, a carbon-based conductive additive (D) in an amount of 0.3 to 2.5 parts by mass, and polyalkylene glycol (E) in an amount of 0.5 to 3.0 parts by mass, wherein the carbon-based conductive additive (D) is one selected from a group consisting of only a carbon nano-structure (D1) and a combination of the carbon nano-structure (D1) and carbon black (D2) having a BET specific surface area of 300 m/g or more.

Polyacetal resin composition and automobile part

A polyacetal resin composition contains a polyacetal copolymer (A) in an amount of 100 parts by mass, the polyacetal copolymer resin having a hemiformal terminal group amount of 0.8 mmol/kg or less, an antioxidant (B) in an amount of 0.5 to 3.0 parts by mass, at least one of zinc oxide or magnesium oxide (C) having an average particle diameter of 5 μm or less in an amount of more than 2.0 parts by mass and 12 parts by mass or less, carbon black (D) having a BET specific surface area of 300 to 400 m/g in an amount of 5.0 to 16 parts by mass, and polyalkylene glycol (E) in an amount of 0.5 to 3.0 parts by mass.

A polyacetal resin composition capable of minimizing degradation when a molded body thereof comes into contact with an acidic cleaner. The polyacetal resin composition contains with respect to (A) 100 parts by mass of a polyacetal copolymer in which the amount of a hemiformal end group is 0.8 mmol/kg or less, (B) more than 1.0 parts by mass and at most 5.0 parts by mass of a hindered phenol-based antioxidant, and (C) more than 4.0 parts by mass and at most 30 parts by mass of magnesium oxide.

Polyacetal resin composition

A polyarylene sulfide resin composition characterized by comprising a polyarylene sulfide resin, and an olefinic copolymer comprising an &#x3b1;-olefin-derived structural unit and an &#x3b1;,&#x3b2;-unsaturated acid glycidyl ester-derived structural unit, wherein the olefinic copolymer content is at least 1.0 parts by mass and less than 5.0 parts by mass with respect to 100 parts by mass of the polyarylene sulfide resin, a melt viscosity of the polyarylene sulfide resin measured at 310&#xb0; C. and a shear rate of 1216 secis at least 70 Pa&#xb7;s and at most 300 Pa&#xb7;s, and a flow length for a width of 20 mm and a thickness of 1 mm, at a cylinder temperature of 320&#xb0; C., an injection pressure of 100 MPa and a mold temperature of 150&#xb0; C., is at least 80 mm and at most 200 mm.

Polyarylene sulfide resin composition and insert molded article

The present invention addresses the problem of providing a polyacetal resin composition which can minimize degradation of a molded product produced from the acetal resin composition, when the molded product is in contact with an acidic cleaner. Said problem is solved by a polyacetal resin composition, comprising: polyacetal copolymer (A) in an amount of 100 parts by mass, wherein said polyacetal copolymer (A) has a hemiformal terminal group content of 0.8 mmol/kg or less; hindered phenol-based antioxidant (B) in an amount of 0.1 to 1.0 part by mass; and at least one selected from an oxide of magnesium or zinc or a hydroxide of magnesium or zinc (C) in an amount more than 2.0 parts by mass and 30 parts by mass or less.

A corona-resistant resin composition and a corona-resistant member, having sufficient durability relative to corona discharge, are provided. A corona-resistant resin composition obtained, at least, by melt kneading 7 to 80 parts by mass of a silicone-based polymer per 100 parts by mass of a resin component, and a corona-resistant member formed by molding the corona-resistant resin composition, are disclosed. A polyarylene sulfide resin or a polybutylene terephthalate resin may be used as the resin component.

Corona-resistant resin composition, method for developing corona resistance of resin composition, and corona-resistant member

A corona resistant resin composition having sufficient resistance to corona discharge, and a corona resistant member are provided. This corona resistant member is formed by molding a corona-resistant resin composition obtained by melting and mixing at least a resin component and mica, and a mode diameter of the mica in the volume-based particle size distribution measured by a laser diffraction/scattering method after molding is 1 to 200 &#x3bc;m. For 100 parts by mass of the resin component, there are preferably 25-101 parts by mass of mica.

Corona-resistant member, corona-resistant resin composition, and method for developing corona resistance of resin molded article

Provided is a PAS resin composition with which molded articles having excellent high- and low-temperature impact properties can be obtained and which can be highly inhibited from leaving mold deposits when molded and is suitable for use in insert molding. Also provided is an insert-molded article obtained using the resin composition. The PAS-derived resin composition comprises a PAS resin having carboxylic terminal groups and an olefin-derived copolymer, wherein the olefin-derived copolymer comprises units of an &#x3b1;-olefin, a glycidyl ester of an &#x3b1;,&#x3b2;-unsaturated acid, and an acrylic ester as comonomer units, the PAS resin has a number average molecular weight of 1,000-10,000, and the content of the comonomer units derived from the glycidyl ester in the resin composition is 0.08-0.20 mass %, the ratio of the content of the comonomer units derived from the glycidyl ester (mmol/kg) to the amount of the carboxylic terminal groups (mmol/kg) being 0.35-1.00.

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Shizuoka, Japan

Hiroki Arai