Patent ID: 6086987
Filing Date: 2000-07-11
Classification: C08J,C08K,Y10T

Abstract:
A synthetic paper made of a stretched resin film; said stretched resin film being obtained by stretching a resin film having a support layer which comprises:(A) from 30 to 80% by weight of said composition of a crystalline polyolefin resin; and(B) from 70 to 20% by weight of said composition of milled calcium carbonate particles selected from the group consisting of:(b1) milled calcium carbonate particles having an average particle size of from 0.3 to 2 .mu.m prepared by wet-milling 100 parts by weight of calcium carbonate particles in an aqueous medium in the presence of from 0.05 to 2 parts by weight of a dispersant comprising a copolymer of from 10 to 95% by mol of an amine salt selected from the group consisting of diallylamine salts and alkylallylamine salts with from 90 to 5% by mol of an amide selected from the group consisting of acrylamide and methacrylamide, followed by drying; and(b2) milled calcium carbonate particles having an average particle size of from 0.3 to 2 .mu.m prepared by wet-milling 100 parts by weight of calcium carbonate particles in an aqueous medium in the presence of from 0.05 to 2 parts by weight of a dispersant comprising a copolymer of from 10 to 95% by mol of an amine salt selected from the group consisting of diallylamine salts and alkylallylamine salts with from 90 to 5% by mol of an amide selected from the group consisting of acrylamide and methacrylamide and then treating the thus milled product in an aqueous medium with 0.5 to 10 parts by weight of a sulfonate selected from the group consisting of sulfonates of alkylene oxide adducts of monohydric alcohols, alkylsulfonates and alkylbenzenesulfonates followed by drying; and wherein said stretching is performed at a temperature lower than the melting point of said crystalline polyolefin resin employed as component (A).