Liquid crystalline polyester composition

Abstract

A liquid crystal polyester composition contains a liquid crystal polyester, a fluorine resin, a carbon fiber, and a granular filler.

1 . A liquid crystal polyester composition containing a liquid crystal polyester, a fluorine resin, a carbon fiber, and a granular filler. 
     
     
         2 . The liquid crystal polyester composition according to  claim 1 , wherein the liquid crystal polyester has a repeating unit represented by formula (1), a repeating unit represented by formula (2), and a repeating unit represented by formula (3).
 (1) —O—Ar 1 —CO—   (2) —CO—Ar 2 —CO—   (3) —X—Ar 3 —Y—   
       wherein Ar 1  represents a phenylene group, a naphthylene group, or a biphenylylene group; Ar 2  and Ar 3  each independently represent a phenylene group, a naphthylene group, a biphenylylene group, or a group represented by formula (4); X and Y each independently represent an oxygen atom or an imino group; and each hydrogen atom present in the group represented by Ar 1 , Ar 2  or Ar 3  may be independently substituted with a halogen atom, an alkyl group or an aryl group;
 (4) —Ar 4 —Z—Ar 5 — 
 
       wherein Ar 4  and Ar 5  each independently represent a phenylene group or a naphthylene group; and Z represents an oxygen atom, a sulfur atom, a carbonyl group, a sulfonyl group or an alkylidene group. 
     
     
         3 . The liquid crystal polyester composition according to  claim 2 , wherein the liquid crystal polyester has 30 to 80 mol % of the repeating unit represented by formula (1), 10 to 35 mol % of the repeating unit  4 represented by formula (2), and 10 to 35 mol % of the repeating unit represented by formula (3), relative to a total amount of all repeating units of the liquid crystal polyester. 
     
     
         4 . The liquid crystal polyester composition according to  claim 1 , wherein the granular filler is at least one granular filler selected from the group consisting of aluminum oxide, silicon oxide and titanium oxide. 
     
     
         5 . The liquid crystal polyester composition according to  claim 1 , wherein a volume average particle diameter of the granular filler is 1 μm or less. 
     
     
         6 . The liquid crystal polyester composition according to  claim 1 , wherein the fluorine resin comprises 5 to 20 parts by mass, relative to 100 parts by mass of the liquid crystal polyester. 
     
     
         7 . The liquid crystal polyester composition according to  claim 1 , wherein the carbon fiber comprises 15 to 30 parts by mass, relative to 100 parts by mass of the liquid crystal polyester. 
     
     
         8 . The liquid crystal polyester composition according to  claim 1 , wherein the granular filler comprises 5 to 20 parts by mass, relative to 100 parts by mass of the liquid crystal polyester. 
     
     
         9 . The liquid crystal polyester composition according to  claim 1 , further containing a plate-shaped filler. 
     
     
         10 . The liquid crystal polyester composition according to  claim 9 , wherein the plate-shaped filler is at least one selected from the group consisting of mica and graphite. 
     
     
         11 . The liquid crystal polyester composition according to  claim 9 , wherein the plate-shaped filler comprises 5 to 10 parts by mass, relative to 100 parts by mass of the liquid crystal polyester. 
     
     
         12 . A sliding member obtained by molding the liquid crystal polyester composition as defined in  claim 1 .