US 6,444,739 B1 · Polyamide resin composition

Abstract

The polyamide resin composition comprises a copolyamide resin, a nucleating agent for crystallization, and optionally an inorganic filler. The copolyamide resin is produced by polycondensing a carboxylic acid component mainly comprising adipic acid with a diamine component containing trans-1,4-bis(aminomethyl)cyclohexane, cis- 1,4-bis(aminomethyl)cyclohexane, and optionally another diamine. The nucleating agent for crystallization is selected from an organic nucleating agent and an inorganic nucleating agent. The polyamide resin composition exhibits a good molding cycle and provides a shaped article excellent in the retention of rigidity at a high temperature condition, the durability under a high temperature condition, and the retention of mechanical properties after water-absorption. Therefore, the polyamide resin composition is useful as a metal replacement in various applications such as automobile parts, mechanical parts and electric or electronic parts.

Claims24

Dependent claims

A polyamide resin composition comprising:

100 parts by mass of a copolyamide resin (A) which is produced by polycondensing a diamine component (a) comprising 70 to 100 mol % of a diamine component (I) and 30 to 0 mol % of a diamine component (II) with a dicarboxylic acid component (b), the diamine component (I) comprising 30 to 70 mol % of trans-1,4-bis(aminomethyl)cyclohexane and 70 to 30 mol % of cis-1,4-bis(aminomethyl)cyclohexane with the combined molar percentages of the cis-trans isomers being 100 mol %, the diamine component (II) comprising p-xylylenediamine and/or hexamethylenediamine, and the dicarboxylic acid component (b) comprising 70 mol % or more of adipic acid;
and
1 to 30 parts by mass of at least one nucleating agent for crystallization (B) selected from the group consisting of an inorganic nucleating agent and an organic nucleating agent, the inorganic nucleating agent being a talc powder or a ceramic particle, and the organic nucleating agent being a crystalline resin having a half-crystallization time of 30 sec or less when measured at 160° C. by depolarized light intensity method.

A polyamide resin composition comprising:

100 parts by mass of a copolyamide resin (A′) which is produced by polycondensing a diamine component (a′) comprising 70 to 100 mol % of a diamine component (I′) and 30 to 0 mol % of a diamine component (II′) with a dicarboxylic acid component (b), the diamine component (I′) comprising 30 to 90 mol % of trans-1,4-bis(aminomethyl)cyclohexane and 70 to 10 mol % of cis-1,4-bis(aminomethyl)cyclohexane with the combined molar percentages of the cis-trans isomers being 100 mol %, the diamine component (II′) comprising a diamine excluding both p-xylylenediamine and hexamethylenediamine, and the dicarboxylic acid component (b) comprising 70 mol % or more of adipic acid;
and
1 to 30 parts by mass of at least one nucleating agent for crystallization (B) selected from the group consisting of an inorganic nucleating agent and an organic nucleating agent, the inorganic nucleating agent being a talc powder or a ceramic particle, and the organic nucleating agent being a crystalline resin having a half-crystallization time of 30 sec or less when measured at 160° C. by depolarized light intensity method.

Dependencies are inferred from the claim text.

Polyamide resin composition

Life of this patent

Polyamide resin composition

Life of this patent

Abstract

Claims24