Liquid crystal polyester resin mixture

• US 6,702,956 B2
• Filed: 06/25/2002
• Issued: 03/09/2004
• Est. Priority Date: 06/28/2001
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Maeda, Mituo, Nagano, Satoshi, Hirakawa, Manabu
• Primary Examiner(s): WU, SHEAN CHIU
• Application Number:
  US10/178,227
• Publication Number:
  US 20030047712A1
• Time in Patent Office: 623 Days
• Field of Search: 252/299.01, 252/299.67, 252/299.5, 525/132, 525/397, 524/539
• US Class Current: 252/299.67
• CPC Class Codes: C08K 5/20 Carboxylic acid amides
• CPC Class Codes: C08L 23/06 Polyethene
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 67/00 Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain of polyester-amides C08L77/12; of polyester-imides C08L79/08; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence

Abstract

A liquid crystal polyester resin mixture having a stabilized plastication time and accordingly possible to be molded in constant cycles and giving a molded article excellent in mechanical properties and thermal stability is provided. The liquid crystal polyester resin mixture comprises 100 parts by weight of a liquid crystal polyester resin composition which comprises 100 parts by weight of a liquid crystal polyester and from 0 to 150 parts by weight of a filler, and either from 0.001 to 5 parts by weight of a fatty acid amide having a formula; R₁—CO—NH₂ (wherein R₁ denotes a saturated or unsaturated hydrocarbon of 10 to 30 carbons) or from 0.001 to 2 parts by weight of a high molecular weight polyethylene with a molecular weight of 10,000 or higher.

Claims

1. A liquid crystal polyester resin mixture comprising 100 parts by weight of a liquid crystal polyester resin composition which comprises 100 parts by weight of a liquid crystal polyester and from 0 to 150 parts by weight of a filler, and either from 0.001 to 5 parts by weight of a fatty acid amide having a formula;

R₁—

CO—

NH₂ (wherein R₁ denotes a saturated or unsaturated hydrocarbon of from 10 to 30 carbons) or from 0.001 to 2 parts by weight of a high molecular weight polyethylene with a molecular weight of 10,000 or higher.

2. The liquid crystal polyester resin mixture according to claim 1, wherein the liquid crystal polyester is a resin containing at least 30% by mole of a repeating monomer unit defined as the following formula A₁:

3. The liquid crystal polyester resin mixture according to claim 1, wherein the liquid crystal polyester resin composition is mixed with the fatty acid amide or the high molecular weight polyethylene at a temperature lower than the fluidizing temperature of the liquid crystal polyester resin composition.

4. A liquid crystal polyester resin molded article comprising the liquid crystal polyester resin mixture as described in claim 1.

5. The liquid crystal polyester resin molded article according to claim 4, wherein the liquid crystal polyester is a resin containing at least 30% by mole of a repeating monomer unit defined as the following formula A₁:

6. A method for producing a liquid crystal polyester resin molded article comprising steps of heating a liquid crystal polyester resin mixture comprising 100 parts by weight of a liquid crystal polyester resin composition which comprises 100 parts by weight of liquid crystal polyester and from 0 to 150 parts by weight of a filler, and either from 0.001 to 5 parts by weight of a fatty acid amide having a formula;

R₁—

CO—

NH₂ (wherein R₁, denotes a saturated or unsaturated hydrocarbon of 10 to 30 carbons) or 0.001 to 2 parts by weight of a high molecular weight polyethylene with a molecular weight of 10,000 or higher;

melting the liquid crystal polyester resin mixture, weighing the melted liquid crystal polyester resin mixture, and molding the melted liquid crystal polyester resin mixture.