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Abstract

Coalesced rubber particles having an average particle size of 5-50 microns are produced by:

(1) adding simultaneously to a latex of pre-crosslinked rubber particles a solvent and an electrolyte solution to form swollen rubber aggregation particles, wherein the solvent has a lower boiling point than water and a capacity of swelling the rubber by at least 10 wt %, and the electrolyte is a solution of at least one metal salt;(2) removing the solvent under atmospheric pressure or low vacuum and at temperature greater than 80° C. to coalesce the rubber into particles having an average particle size of 5-50 50 microns;(3) filtering and washing with methanol; and(4) filtering the washed particles to remove methanol.

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First Claim