LIQUID CRYSTAL POLYESTER RESIN COMPOSITION

• US 20120235092A1
• Filed: 03/02/2012
• Published: 09/20/2012
• Est. Priority Date: 03/16/2011
• Status: Active Grant

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: MATSUI, Hirokazu, HARADA, Hiroshi, SEKIMURA, Satoshi
• Granted Patent: US 8,641,924 B2
• Time in Patent Office: Days
• US Class Current: 252/299.64
• CPC Class Codes: B29B 7/007 for continuous mixing
• CPC Class Codes: B29B 7/38 rotary B29B7/52 takes precedence
• CPC Class Codes: B29B 7/90 Fillers or reinforcements , e.g. fibres
• CPC Class Codes: B29B 9/06 in the form of filamentary material, e.g. combined with extrusion
• CPC Class Codes: B29B 9/12 characterised by structure or composition
• CPC Class Codes: B29B 9/14 fibre-reinforced
• 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 3/12 Powdering or granulating
• CPC Class Codes: C08J 5/043 with glass fibres
• CPC Class Codes: C08L 2205/16 Fibres; Fibrils
• 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
• CPC Class Codes: C09K 19/3809 Polyesters; Polyester derivatives, e.g. polyamides

Abstract

An object is to provide a liquid crystal polyester resin composition capable of producing a molding in which the generation amount of particles is sufficiently reduced.

The present invention provides a liquid crystal polyester resin composition including (1) a liquid crystal polyester, and (2) a fiber-shaped filler having a fiber diameter of 5 to 15 μm and a number average fiber length of 30 to 200 μm, wherein the content of a fiber having a fiber length of more than 200 μm is 10% by mass or less based on 100% by mass of the amount of the fiber-shaped filler.

Claims

1. A liquid crystal polyester resin composition comprising:

(1) a liquid crystal polyester, and

(2) a fiber-shaped filler having a fiber diameter of 5 to 15 μ

m and a number average fiber length of 30 to 200 μ

m, wherein the content of a fiber having a fiber length of more than 200 μ

m is 10% by mass or less based on 100% by mass of the amount of the fiber-shaped filler.

2. The liquid crystal polyester resin composition according to claim 1, wherein the liquid crystal polyester is a liquid crystal polyester including repeating units represented by the following general formulas (1), (2) and (3) :

—

O—

Ar¹—

CO—

,  

 

(1)

—

CO—

Ar¹—

CO—

,  

 

(2)

—

X—

Ar³—

Y—

, and  

 

(3)

—

Ar⁴—

Z—

Ar⁵—

 

 

(4)

wherein Ar¹ is a phenylene group, a naphthylene group or a biphenylylene group;

Ar² and Ar³ each independently represents a phenylene group, a naphthylene group, a biphenylylene group, or a group represented by the general formula (4);

X and Y each independently represents an oxygen atom or an imino group;

Ar⁴ and Ar⁵ each independently represents a phenylene group or a naphthylene group;

Z is an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group or an alkylidene group;

hydrogen atoms in Ar¹, Ar² or Ar³ each independently may be substituted with a halogen atom, an alkyl group or an aryl group.

3. The liquid crystal polyester resin composition according to claim 2, wherein the liquid crystal polyester is a liquid crystal polyester including a repeating unit represented by the general formula (1) in the amount of 30 to 80 units, a repeating unit represented by the general formula (2) in the amount of 10 to 35 units and a repeating unit represented by the general formula (3) in the amount of 10 to 35 units, based on 100 units in total of repeating units represented by the general formulas (1), (2) and (3).

4. The liquid crystal polyester resin composition according to claim 2, wherein X and Y in the general formula (3) are oxygen atoms.