Liquid crystalline polyester resin composition, molded article and holder for optical pickup lenses

• US 8,066,907 B2
• Filed: 09/27/2010
• Issued: 11/29/2011
• Est. Priority Date: 09/29/2009
• Status: Expired due to Fees

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Maeda, Mitsuo, Harada, Hiroshi, Kohinata, Yusaku
• Primary Examiner(s): Wu; Shean
• Application Number:
  US12/890,844
• Publication Number:
  US 20110073807A1
• Time in Patent Office: 428 Days
• Field of Search: 252/299.01, 252/299.5, 252/299.6, 252/299.67, 524/493, 524/495, 524/496, 359/802, 359/819
• US Class Current: 252/299.6
• CPC Class Codes: C09K 19/3809 Polyesters; Polyester derivatives, e.g. polyamides
• CPC Class Codes: C09K 19/52 characterised by components which are not liquid crystals, e.g. additives with special physical aspect: solvents, solid particles
• CPC Class Codes: G11B 7/0935 Details of the moving parts
• CPC Class Codes: G11B 7/22 Apparatus or processes for the manufacture of optical heads, e.g. assembly

Abstract

A liquid crystalline polyester resin composition is provided, by which a molded article with an enhanced specific modulus can be produced. The liquid crystalline polyester resin composition comprises mica fillers in an amount of 15 to 30 parts by mass and carbon fibers with specific volume resistance of 10⁸ Ωcm or more in an amount of 5 to 20 parts by mass with respect to 100 parts by mass of the liquid crystalline polyester.

Claims

1. A liquid crystalline polyester resin composition comprising:

mica fillers in an amount of 15 to 30 parts by mass; and

carbon fibers with specific volume resistance of 10⁸ Ω

cm or more in an amount of 5 to 20 parts by mass with respect to 100 parts by mass of the liquid crystalline polyester.

2. The liquid crystalline polyester resin composition according to claim 1 further comprising hollow fillers in an amount of 10 parts by mass or less with respect to 100 parts by mass of the liquid crystalline polyester.

3. The liquid crystalline polyester resin composition according to claim 1, wherein the liquid crystalline polyester has a flow beginning temperature of 360°

C. or higher.

4. The liquid crystalline polyester resin composition according to claim 1, wherein the mica has a volume-average particle diameter of 40 μ

m or less.

5. The liquid crystalline polyester resin composition according to claim 1, wherein the mica has a specific surface area of 6 m²/g or less.

6. The liquid crystalline polyester resin composition according to claim 1, wherein the carbon fiber has a specific modulus of 30 GPa or more.

7. A molded article formed by molding the liquid crystalline polyester resin composition according to claim 1.

8. The molded article according to claim 7, wherein the article has a specific gravity of from 1.30 to 1.55 determined by method A defined in ASTM D792.

9. A holder for optical pickup lenses comprising the molded article according to claim 7 as a bobbin.