| abstract |
A METHOD OF MODIFYING THE PARTICLE SIZE DISTRIBUTION OF A CARBOXYLATED POLYMER LATEX COMPRISES: (1) ADMIXING WITH THE LATEX SUFFICIENT OF A SECOND EMULSIFIER, WHICH IS AN ORGANIC CARBOXYLIC ACID SALT, AT LEAST PARTIALLY TO REPLACE THE FIRST EMULSIFIER ON THE LATEX PARTICLES WITH THE SECOND EMULSIFIER, AND (2) PASSING THE LATEX CONTAINING AT LEAST 15% BY WEIGHT OF POLYMER PARTICLES THROUGH A CONSTRICTION AT A PRESSURE OF NOT LESS THAN 1,000P.S.I.G. THE PROCESS IS PARTICULARLY APPLICABLE TO LATICES HAVING A PARTICLE SIZE OF LESS THAN 1,000 A. ENABLING A LATEX OF INCREASED NUMBER AVERAGE PARTICLE SIZE TO BE OBTAINED. THIS, IN TURN, ENABLES CONCENTRATION OF THE TREATED LATEX TO A HIGH SOLIDS CONTENT. |