Process of producing a polymeric film of a copolymer of an etherified n-methylol amide and an ethylenically unsaturated monomer

Claim 1

A PROCESS FOR THE PRODUCTION OF A POLYMERIC FILM WHICH COMPRISES (1) APPLYING TO A SUPPORT A STORAGESTABLE AQUEOUS EMULSION OF A LINEAR WATER-INSOLUBLE COPOLYMER, CONTAINING ETHERIFIED N-METHYLOL GROUPS, OF (A) AN ALPHA,BETA-MONOETHYLENICALLY UNSATURATED AMIDE SELECTED FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHACRYLAMIDE, MALEIC ACID DIAMIDE, FUMARIC ACID DIAMIDE, SORBIC ACID AMIDE, AND MUCONIC ACID DIAMIDE, IN WHICH ONE OF THE HYDROGEN ATOMS OF AN AMIDE GROUP IS REPLACED BY A -CH2-O-ALKYL GROUP OF 1 TO 4 CARBON ATOMS, AND (B) A MONOMER COPOLYMERIZABLE THEREWITH SELECTED FROM THE GROUP CONSISTING OF A 4 TO 6 CARBON CONJUGATED DIENE AND A MONOETHYLENICALLY UNSATURATED ORGANIC COMPOUND IN WHICH THE CH2=CHGROUP IS THE SOLE GROUP CAPABLE OF TAKING PART IN THE COPOLYMERIZATION, SAID COMPOUND (A) BEING PRESENT IN AN AMOUNT OF 0.5-30 MOLE PERCENT BASED ON THE AMOUNT OF THE SAID SECOND MONOMER, SAID AQUEOUS EMULSION HAVING BEEN ADJUSTED TO A PH OF ABOUT 6.5 TO 9 IN ORDER TO PREVENT CROSS-LINKING OF THE COPOLYMER DURING STORAGE, FOLLOWED BY (2) HEATING THE LATEX COATING TO A TEMPERATURE OF ABOUT 70-200*C. TO FORM A CROSS-LINKED POLYMER.