LIQUID CRYSTALLINE POLYESTER COMPOSITION, METHOD FOR PRODUCING THE SAME, AND CONNECTOR

• US 20110189454A1
• Filed: 01/27/2011
• Published: 08/04/2011
• Est. Priority Date: 01/29/2010
• Status: Abandoned Application

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: MATSUMI, Yasuo, FUKUHARA, Yoshiyuki
• Application Number:
  US13/014,936
• Publication Number:
  US 20110189454A1
• Time in Patent Office: Days
• US Class Current: 428/220
• CPC Class Codes: B29C 2948/92514 Pressure
• CPC Class Codes: B29C 2948/92895 Barrel or housing
• CPC Class Codes: B29C 48/04 Particle-shaped making granules B29B9/00
• CPC Class Codes: B29C 48/365 using pumps, e.g. piston pumps
• CPC Class Codes: B29C 48/40 using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
• CPC Class Codes: B29C 48/405 Intermeshing co-rotating screws
• CPC Class Codes: B29C 48/41 Intermeshing counter-rotating screws
• CPC Class Codes: B29C 48/535 with thread pitch varying along the longitudinal axis
• CPC Class Codes: B29C 48/54 with additional forward-feeding elements
• CPC Class Codes: B29C 48/55 having reverse-feeding elements
• CPC Class Codes: B29C 48/57 provided with kneading disc-like elements, e.g. with oval-shaped elements
• CPC Class Codes: B29C 48/625 characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
• CPC Class Codes: B32B 5/00 Layered products characterised by the non- homogeneity or physical structure , i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
• CPC Class Codes: C08K 3/04 Carbon
• CPC Class Codes: C08K 3/34 Silicon-containing compounds
• CPC Class Codes: C08L 67/03 the dicarboxylic acids and dihydroxy compounds having the carboxyl- and the hydroxy groups directly linked to aromatic rings

Abstract

The present invention provides a composition comprising a liquid crystalline polyester, a plate-like filler and a carbon black having a number average particle size of more than 20 nm and 45 nm or less. The composition is less likely to cause blister even at a high temperature.

Claims

1. A composition comprising a liquid crystalline polyester, a plate-like filler and a carbon black having a number average particle size of more than 20 nm and 45 nm or less.

2. The composition according to claim 1, wherein the liquid crystalline polyester has a structural unit represented by the following formula (A₁):

3. The composition according to claim 1, wherein the plate-like filler is talc and/or mica.

4. The composition according to claim 1, wherein the plate-like filler has a volume average particle diameter of from 1 to 100 μ

m.

5. The composition according to claim 1, wherein the plate-like filler is contained in the composition in the amount of from 15 to 100 parts by weight based on 100 parts by weight of the liquid crystalline polyester.

6. The composition according to claim 1, wherein the carbon black is the carbon black which can absorb dibutyl phthalate in the amount of 150 cm³/100 g or less.

7. The composition according to claim 1, wherein the carbon black has a specific surface area of 200 m²/g or less.

8. The composition according to claim 1, wherein the carbon black is the carbon black which can volatize in the amount of 2% by weight or less.

9. The composition according to claim 1, wherein the carbon black is contained in the composition in the amount of from 0.1 to 5 parts by weight based on 100 parts by weight of the liquid crystalline polyester.

10. A method for producing the composition according to claim 1, the method comprises the steps of:

feeding the liquid crystalline polyester, the plate-like filler and the carbon black in an extruder having a vent section, and

melt-kneading them under the conditions where the degree of pressure reduction of the vent section is −

0.06 MPa or less in terms of a gauge pressure.

11. A connector obtained by molding the composition according to claim 1.

12. A connector obtained by molding the composition which is obtained by the method according to claim 10.

13. The connector according to claim 11, which has a thin wall portion having a wall thickness of 0.1 mm or less.

14. The connector according to claim 12, which has a thin wall portion having a wall thickness of 0.1 mm or less.