Fine particle of aluminum hydroxide for filling resin and resin composition using the same

Abstract

A fine particle of aluminum hydroxide is disclosed, comprising a particulae aluminum hydroxide X having a specific surface area of 1.0 m 2 /g or less and a secondary particle size of 35 to 150 μm, a particulate aluminum hydroxide Y having a specific surface area of 1.0 m 2 /g or less and a secondary particle size of 10 to 35 μm and a particulate aluminum hydroxide Z having a specific area of 3.0 m 2 /g or less and a secondary particle size of 0.5 to 10 μm, in a compositional mass ratio falling in the area surrounded by four points of Point a, Point β, Point γ and Point δ including the lines in the ternary composition diagram shown in FIG. 1. By this fine particle of aluminum hydroxide, a fine particle of aluminum hydroxide and a resin composition comprising the fine particle of aluminum hydroxide, which can be reduced in the viscosity at the filling in a resin and attain high filling and when filled in a thermosetting resin, can be shortened in the curing time, can be provided.

What is claimed is:  
     
         1 . A fine particle of aluminum hydroxide for filling in a resin, which has properties such that when 200 parts by weight of said fine particle of aluminum hydroxide is filled into 100 parts by weight of an unsaturated polyester resin having a viscosity of 10 poises at 20° C. measured by a Brookfield viscometer, the viscosity is less than 200 poises in the measurement at 35° C. by a Brookfield viscometer.  
     
     
         2 . The fine particle of aluminum hydroxide for filling in a resin according to  claim 1 , when 150 parts by weight of said fine particle of aluminum hydroxide is filled into a resin composition comprising 100 parts by weight of another unsaturate polyester resin having a viscosity of 18 poises at 25° C. measured by a Brookfield viscometer and 2 parts by weight of methyl ethyl ketone peroxide, the curing time until the viscosity becomes immeasurable due to the curing of resin is less than 20 minutes in the measurement at 35° C. by a Brookfield viscometer.  
     
     
         3 . The fine particle of aluminum hydroxide for filling in a resin according to any one of  claim 1  or  2 , wherein the fine particle of aluminum hydroxide is obtained by blending at least three components (ternary system).  
     
     
         4 . The fine particle of aluminum hydroxide for filling in a resin according to any one of  claim 1  or  2 , wherein the fine particle of aluminum hydroxide comprises a particulate aluminum hydroxide X having a secondary particle size of 35 to 150 μm, a particulate aluminum hydroxide Y having a secondary particle size of 10 to 35 μm and a particulate aluminum hydroxide Z having a secondary particle size of 0.5 to 10 μm.  
     
     
         5 . A resin composition comprising the fine particles of aluminum hydroxide claimed in any one of  claim 1  or  2 .  
     
     
         6 . A resin composition comprising the fine particles of aluminum hydroxide claimed in any one of claims  1  or  2 , wherein the viscosity of the resin composition measured at 35° C. by a Brookfield type viscometer is less than 200 poises.  
     
     
         7 . An artificial marble comprising the fine particle of aluminum hydroxide claimed in any one of claims  1  or  2 .  
     
     
         8 . A bath tub comprising the artificial marble claimed in  claim 7 .  
     
     
         9 . A kitchen counter comprising the artificial marble claimed in  claim 7.