Patent ID: 6191193
Filing Date: 2001-02-20
Classification: C08F,C08J,Y10S

Abstract:
A method for separating poly(vinyl acetate) particles having various particle sizes, which have been prepared by suspension polymerization of vinyl acetate monomers, into individual microspheric poly(vinyl acetate) particles having a uniform particle size distribution and a polydispersity index of particle sizes of about 1.00-1.60, which comprises the steps of:(a) adding to said poly(vinyl acetate) particles having various particle sizes inorganic salt as a dispersing and antistatic agent in the amount of about 0.1-100 parts by weight per part by weight of associates of said poly(vinyl acetate) particles having various particle sizes;(b) milling said associates of poly(vinyl acetate) particles; and(c) separating said milled associates of poly(vinyl acetate) particles with standard sieves to individual particles having select particle sizes of 50-70 .mu.m, 70-90 .mu.m, 90-100 .mu.m, 100-120 .mu.m, 120-150 .mu.m, 150-180 .mu.m, 180-200 .mu.m, 200-220 .mu.m, 220-250 .mu.m, 250-300 .mu.m, 300-350 .mu.m, 350-400 .mu.m, 400-450 .mu.m, 450-500 .mu.m, 500-600 .mu.m, 600-700 .mu.m, 700-800 .mu.m, 800-900 .mu.m and 900-1,000 .mu.m.