Polyarylene sulfide resin composition, and moldings and connectors made of it

Abstract

Provided is a polyarylene sulfide resin composition of which the moldings are burred little and which has good mechanical properties and good flow moldability. The composition comprises from 20 to 90% by weight of a polyarylene sulfide and from 10 to 80% by weight of an inorganic filler, and is characterized in that its burrs are on the level of at most 120 μm, that it has a weld strength of at least 50 MPa and that the length of its spiral flow having a thickness of 1 mm is at least 100 mm. Preferably, the polyarylene sulfide to be in the composition has a specific index to the degree of branching and a specific flexural strength.

What is claimed is:  
     
         1 . A polyarylene sulfide resin composition comprising (A) from 20 to 90% by weight of a polyarylene sulfide and (B) from 10 to 80% by weight of an inorganic filler, which is characterized in that its burrs are on the level of at most 120 μm, that it has a weld strength of at least 50 MPa and that the length of its spiral flow having a thickness of 1 mm is at least 100 mm.  
     
     
         2 . The polyarylene sulfide resin composition as claimed in    claim 1   , wherein the polyarylene sulfide (A) satisfies the following formulae (1) to (4):  
         N≧ 0.3 ×log   10 (η m )+0.5  (1)  N≧ 1.10  (2) F≧57 ×log   10 (η m )−60  (3)  F≧ 40  (4)  
       where N indicates an index to the degree of branching of the polyarylene sulfide, η m  indicates the melt viscosity (unit: Pa·s) of the polyarylene sulfide, and F indicates the flexural strength (unit: MPa) of the polyarylene sulfide.  
     
     
         3 . The polyarylene sulfide resin composition as claimed in    claim 1    or    2   , wherein the melt viscosity η m  of the polyarylene sulfide (A) falls between 20 and 1500 Pa·s.  
     
     
         4 . The polyarylene sulfide resin composition as claimed in anyone of    claims 1    to    3   , wherein the inorganic filler is of glass fibers.  
     
     
         5 . A molding made of the polyarylene sulfide resin composition of any one of    claims 1    to    4   .  
     
     
         6 . A connector made of the polyarylene sulfide resin composition of any one of    claims 1    to    4   .  
     
     
         7 . A polyarylene sulfide resin (A) to be in the polyarylene sulfide resin composition of    claim 1   , which satisfies the following formulae (1) to (4):  
         N≧ 0.3 ×log   10 (η m )+0.5  (1)  N≧ 1.10  (2)  F≧ 57 ×log   10 (η m )−60  (3)  F≧ 40  (4)  
       wherein N indicates an index to the degree of branching of the polyarylene sulfide, η m  indicates the melt viscosity (unit: Pa·s) of the polyarylene sulfide, and F indicates the flexural strength (unit: MPa) of the polyarylene sulfide.