Process for forming films from nonelastic polymer latexes

Claim 1

A PROCESS FOR PREPARING THIN, CONTINUOUS, COHERENT, SELF-SUPPORTING FILMS FROM POLYMER LATEXES OF NON-ELASTIC POLYMERS AS COMPARED WITH RUBBER CONSISTING OF PROVIDING A THIN CONTINUOUS COATING OF AN AQUEOUS-COAGULANT COMPRISING COAGULATIVE AMOUNTS OF A WATER-SOLUBLE ELECTROLYTE COAGULANT FOR SAID LATEX AND AN ORGANIC WATERMISCIBLE SOLVENT AT LEAST AS VOLATILE AS WATER AND CAPABLE OF AT LEAST SWELLING SAID POLYMER UPON A CONTINUOUS SURFACE WETTABLE THEREBY, CONTACTING THE SO-TREATED SURFACE WITH A POLYMER LATEX CONTAINING AT LEAST 25 PERCENT NONVOLATILE SOLIDS TO FORM A COHERENT CONTINUOUS COAGULUM ON SAID SURFACE, STRIPPING SAID COAGULUM FROM SAID SURFACE, WASHING SAID COAGULUM WITH WATER TO REMOVE SUBSTANTIALLY ALL OF SAID ELECTROLYTE COAGULANT, DRYING SAID FILM TO REMOVE THE WATER AND SOLVENT, AND FUSING THE WASHED WEAK FILM TO FORM A THIN, CONTINUOUS, COHERENT, SELF-SUPPORTING FILM.