Liquid crystalline polyester composition, method of producing the same and molded product manufactured from the same

• US 8,778,222 B2
• Filed: 12/14/2011
• Issued: 07/15/2014
• Est. Priority Date: 12/28/2010
• Status: Active Grant

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Matsubara, Satoshi, Umetsu, Hideyuki, Hase, Takayuki
• Primary Examiner(s): Visconti, Geraldina
• Application Number:
  US13/637,742
• Publication Number:
  US 20130015401A1
• Time in Patent Office: 944 Days
• Field of Search: 252/299.01, 252/299.5, 428/1.1, 349/183, 264/328.17, 524/495, 525/418
• US Class Current: 252/299.01
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: C08J 2367/03 the dicarboxylic acids and dihydroxy compounds having the hydroxy and the carboxyl groups directly linked to aromatic rings
• CPC Class Codes: C08J 5/043 with glass fibres
• CPC Class Codes: C08K 7/14 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 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition

Abstract

A liquid crystalline polyester composition contains at least 100 parts by weight of liquid crystalline polyester and 10 to 100 parts by weight of glass fiber, wherein the glass fiber has a weight-average fiber length of 30 to 100 μm, and content of specific glass fiber having fiber length of 300 to 500 μm is 0.1 to 5 percent by weight to a total amount of the glass fiber.

Claims

1. A liquid crystalline polyester composition comprising at least 100 parts by weight of liquid crystalline polyester and 10 to 100 parts by weight of glass fiber, wherein

the glass fiber has a weight-average fiber length of 30 to 100 μ

m, and

content of specific glass fiber having fiber length of 300 to 500 μ

m is 0.1 to 5.0 percent by weight to a total amount of the glass fiber.

2. The liquid crystalline polyester composition according to claim 1, wherein

a ratio (S1/S2) of total weight fraction (S1) of glass fiber having the fiber length of not less than a mode in a fiber length distribution of the glass fiber to total weight fraction (S2) of glass fiber having the fiber length of less than the mode is 3.0 to 6.0.

3. The liquid crystalline polyester composition according to claim 1, wherein

the liquid crystalline polyester has structural units (I), (II), (III), (IV) and (V):

4. A method of producing the liquid crystalline polyester composition according to claim 1, comprising

melt-kneading at least liquid crystalline polyester and glass fiber by an extruder, and

melt-kneading with a filling factor in the extruder of 60 to 90%.

5. A molded product manufactured by injection molding the liquid crystalline polyester composition according to claim 1.

6. A relay component comprising the molded product according to claim 5.

7. The liquid crystalline polyester composition according to claim 2, wherein

the liquid crystalline polyester has structural units (I), (II), (III), (IV) and (V)

8. A method of producing the liquid crystalline polyester composition according to claim 2, comprising

melt-kneading at least liquid crystalline polyester and glass fiber by an extruder, and

melt-kneading with a filling factor in the extruder of 60 to 90%.

9. A method of producing the liquid crystalline polyester composition according to claim 3, comprising

melt-kneading at least liquid crystalline polyester and glass fiber by an extruder, and

melt-kneading with a filling factor in the extruder of 60 to 90%.

10. A method of producing the liquid crystalline polyester composition according to claim 7, comprising

melt-kneading at least liquid crystalline polyester and glass fiber by an extruder, and

melt-kneading with a filling factor in the extruder of 60 to 90%.

11. A molded product manufactured by injection molding the liquid crystalline polyester composition according to claim 2.

12. A relay component comprising the molded product according to claim 11.