Method of preparing diene latex having a large particle size by addition of a pretreated seed latex to an agglomerating agent

摘要

A method of preparing a diene rubber latex having large size particles, good stability and reduced coagulum during polymerization wherein the method comprises:;(a) pretreating a seed diene rubber latex with an anionic emulsifier and a non-ionic emulsifier,;(b) adjusting the pH of an unsaturated carboxylic acid-containing copolymer latex to about 5 to 11 and adjusting the solids content of the copolymer latex to about 1 to 10% by weight solids content to produce an agglomerating latex solution, and;(c) adding the pretreated seed diene rubber latex of step (a) to the agglomerating latex solution of step (b).;Step (c) must be carried out by adding the pretreated seed diene rubber latex to the agglomerating latex. If the agglomerating latex is added to the rubber latex, an undesirable level of coagulum is produced.