Liquid crystal polyester resin composition for camera module

• US 8,192,645 B2
• Filed: 03/24/2009
• Issued: 06/05/2012
• Est. Priority Date: 03/28/2008
• Status: Active Grant

• Current Assignee: ENEOS Corporation (ENEOS Holdings, Inc.)
• Original Assignee: JX Nippon Oil & Energy Corporation (ENEOS Holdings, Inc.)
• Inventors: Murouchi, Satoshi, Nakayama, Toshio, Kitai, Toru
• Primary Examiner(s): WU, SHEAN CHIU
• Application Number:
  US12/933,967
• Publication Number:
  US 20110089371A1
• Time in Patent Office: 1,169 Days
• Field of Search: 252/299.01, 252/299.5, 252/299.67, 524/424, 524/451, 524/493, 524/494, 524/495, 348/374
• US Class Current: 252/299.01
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 7/28 Glass
• CPC Class Codes: C08L 67/03 the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings
• CPC Class Codes: C09K 19/3809 Polyesters; Polyester derivatives, e.g. polyamides
• CPC Class Codes: G03B 9/00 Exposure-making shutters; Diaphragms
• CPC Class Codes: H04N 23/57 Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices

Abstract

A resin composition for surface-mountable (SMT) camera modules which is excellent in the balance between heat resistance, rigidity, strength or moldability and surface exfoliation characteristics is provided by using a liquid-crystal polyester resin composition which comprises 100 parts by mass of a liquid-crystal polyester, 15 to 60 parts by mass of talc having a number-mean particle diameter of 10 to 50 μm, 25 to 50 parts by mass of glass fiber having a number-mean fiber length of 100 to 200 μm, 6 to 20 parts by mass of titanium oxide, and 2 to 10 parts by mass of carbon black and which exhibits a melt viscosity of 10 to 100 Pa S as determined at a shear rate of 100 sec⁻¹ and 370° C. and a deflection temperature under load of 220° C. or above.

Claims

1. A liquid crystal polyester resin composition for a camera module, characterized by comprising, based on 100 parts by mass of a liquid crystal polyester, 50 to 110 parts by mass of talc having a number average particle size of 10 to 50 μ

m, and 2 to 10 parts by mass of carbon black, wherein a deflection temperature under load is 220°

C. or more and a melt viscosity at a shear rate of 100 sec<sup>−

1</sup> at 370°

C. is 10 to 150 Pa·

S.

2. The liquid crystal polyester resin composition according to claim 1, characterized in that a number of exfoliations from a surface of a molded article by injection molding according to the following definition is 200 or less,

number of exfoliations=number of particles in 10 mL of pure water having a maximum diameter in the range of 2 μ

m or more after subjecting 2 cylindrical injection molded articles having a threaded structure with a 0.3 mm pitch and a 0.2 mm groove depth on an inner side of a 7 mm (outer diameter)×

6 mm (inner diameter)×

4 mm (height) cylinder to ultrasonic cleaning for 30 seconds at a power of 40 kHz and 480 W in 266 mL of pure water.

8. A part for a camera module produced from the liquid crystal polyester resin composition according to claim 1, by injection molding.

12. A part for a camera module produced from the liquid crystal polyester resin composition according to claim 2, by injection molding.

3. A liquid crystal polyester resin composition for a camera module, characterized by comprising, based on 100 parts by mass of a liquid crystal polyester, 15 to 60 parts by mass of talc having a number average particle size of 10 to 50 μ

m, 25 to 50 parts by mass of a glass fiber having a number average fiber length of 100 to 200 μ

m, and 2 to 10 parts by mass of carbon black, wherein a deflection temperature under load is 220°

C. or more and a melt viscosity at a shear rate of 100 sec<sup>−

1</sup> at 370°

C. is 10 to 100 Pa·

S.

4. The liquid crystal polyester resin composition according to claim 3, characterized in that the number of exfoliations from a surface of a molded article by injection molding according to the definition is 280 or less.

5. The liquid crystal polyester resin composition for a camera module according to claim 3, characterized by further comprising, based on 100 parts by mass of the liquid crystal polyester, 6 to 20 parts by mass of titanium oxide.

6. The liquid crystal polyester resin composition according to claim 5, characterized in that the number of exfoliations from a surface of a molded article by injection molding according to the definition is 250 or less.

7. The liquid crystal polyester resin composition according to claim 3, characterized in that a weld strength of a molded article by injection molding is 30 MPa or more.

9. The liquid crystal polyester resin composition according to claim 4, characterized in that a weld strength of a molded article by injection molding is 30 MPa or more.

10. The liquid crystal polyester resin composition according to claim 5, characterized in that a weld strength of a molded article by injection molding is 30 MPa or more.

11. The liquid crystal polyester resin composition according to claim 6, characterized in that a weld strength of a molded article by injection molding is 30 MPa or more.

13. A part for a camera module produced from the liquid crystal polyester resin composition according to claim 3, by injection molding.

14. A part for a camera module produced from the liquid crystal polyester resin composition according to claim 4, by injection molding.

15. A part for a camera module produced from the liquid crystal polyester resin composition according to claim 5, by injection molding.

16. A part for a camera module produced from the liquid crystal polyester resin composition according to claim 6, by injection molding.

17. A part for a camera module produced from the liquid crystal polyester resin composition according to claim 7, by injection molding.