Liquid crystalline polymer compositions containing small particle size fillers

Abstract

Compositions comprising liquid crystalline polymer; inert filler; and small particle size filler having a mean particle size less than about 50 nanometers. These blends have excellent adhesion and low surface roughness properties and can be used as molded articles in electronics or electrical applications.

What is claimed is:  
     
         1 . A composition comprising: 
 liquid crystalline polymer, in an amount between about 40 and about 85 weight percent of the composition;    inert filler, in an amount between about 15 and about 55 weight percent of the composition; and    small particle size filler having a mean particle size less than about 50 nanometers, in an amount between about 0.5 and about 5 weight percent of the composition.    
     
     
         2 . The composition of  claim 1 , wherein said inert filler comprises at least one of SiO 2 , CaSO 4 , CaSO 4  whiskers, and TiO 2 .  
     
     
         3 . The composition of  claim 2 , wherein said inert filler component comprises at least one of SiO 2 , TiO 2 , and Al 2 O 3 .  
     
     
         4 . The composition of  claim 3 , wherein said SiO 2  comprises fused SiO 2 .  
     
     
         5 . The composition of  claim 3 , wherein said TiO 2  comprises a chloride process rutile type TiO 2 .  
     
     
         6 . The composition of  claim 1 , wherein said inert filler has a mean particle size of about 30 microns or less.  
     
     
         7 . The composition of  claim 1 , wherein said small particle size filler comprises titanium dioxide.  
     
     
         8 . The composition of  claim 1 , wherein said small particle size filler has a mean particle size of less than about 40 nanometers.  
     
     
         9 . The composition of  claim 1 , wherein said small particle size filler has a mean particle size of less than about 30 nanometers.