Liquid-crystal polyester resin composition

• US 7,985,351 B2
• Filed: 08/02/2005
• Issued: 07/26/2011
• Est. Priority Date: 08/03/2004
• Status: Active Grant

• Current Assignee: NTN Corporation, Sumitomo Chemical Company Limited
• Original Assignee: NTN Corporation, Sumitomo Chemical Company Limited
• Inventors: Maeda, Mitsuo, Satoji, Fuminori, Yamauchi, Hiroyasu, Ito, Kenji
• Primary Examiner(s): Seidleck; James
• Assistant Examiner(s): Tischler; Frances
• Application Number:
  US11/573,055
• Publication Number:
  US 20070219301A1
• Time in Patent Office: 2,184 Days
• Field of Search: 252/299.01, 252/299.6, 252/506, 252/519.12, 528/271, 528/272, 524/405, 524/497, 524/496, 524/495, 524/599, 524/601, 524/602, 524/605
• US Class Current: 252/299.01
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 7/04 inorganic
• 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

Abstract

A liquid crystalline polyester resin composition comprising 100 parts by weight of a liquid crystalline polyester; 50 to 150 parts by weight of at least one whisker selected from aluminum borate whisker and titanium oxide whisker; and 1 to 30 parts by weight of carbon black having a specific surface area of at least 200 m²/g. This liquid crystalline polyester resin composition has excellent mechanical properties and provides an insulator which is hardly charged.

Claims

1. A liquid crystalline polyester resin composition comprising:

100 parts by weight of a liquid crystalline polyester;

50 to 150 parts by weight of at least one whisker selected from aluminum borate whisker and titanium oxide whisker; and

3 to 20 parts by weight of carbon black having a specific surface area of at least 200 m²/g,

wherein the liquid crystalline polyester resin composition has a volume resistivity of 10⁴ to 10⁷ Ω

·

m.

2. The liquid crystalline polyester resin composition according to claim 1, which contains 50 to 130 parts by weight of said at least one whisker and 3 to 20 parts by weight of said carbon black per 100 parts by weight of said liquid crystalline polyester.

3. The liquid crystalline polyester resin composition according to claim 1, wherein said at least one whisker has an average length of 1 to 300 μ

m and an average diameter of 0.3 to 15 μ

m.

4. The liquid crystalline polyester resin composition according to claim 1, wherein said carbon black has a specific surface area of 200 to 3000 m²/g.

5. The liquid crystalline polyester resin composition according to claim 1, wherein said liquid crystalline polyester has a flow-starting temperature of 320 to 400°

C.

6. The liquid crystalline polyester resin composition according to claim 1, wherein said liquid crystalline polyester comprises repeating units (A1) derived from p-hydroxybenzoic acid, repeating units (B1) derived from terephthalic acid, repeating units (B2) derived from isophthalic acid, and repeating units (C1) derived from 4,4′

-dihydroxybiphenyl.