Ampholytic, hydrophilic, polymeric solutions and mixtures thereof with gelatin

Claim 1

AN AMPHOLYTIC AQUEOUS POLYMERIC SOLUTION RESULTING FROM THE POLYMERIZATION IN AQUEOUS DISPERSION OF A MIXTURE OF MONOMERS COMPRISING FROM ABOUT 20 PERCENT TO ABOUT 60 PERCENT OF NAN AMIDE FROM THE GROUP CONSISTING OF ACRYLAMIDE, METHACRYLAMIDE, N-ALKYL ACRYLAMIDE WHEREIN THE ALKYL GROUP CONTAINS 1-4 CARBON ATOMS AND N-ALKYL METHACRYLAMIDE WHEREIN THE ALKYL GROUP CONTAINS 1-4 CARBON ATOMS, FROM ABOUT 5 PERCENT TO ABOUT 40 PERCENT BY WEIGHT OF ACRYLONITRILE, FROM ABOUT 5 PERCENT TO ABOUT 30 PERCENT BY WEIGHT OF N,N-DIALKYL AMINOALKYL ACRYLATE WHEREIN EACH ALKYL GROUP CONTAINS 1-4 CARBON ATOMS, AND FROM ABOUT 5 PERCENT TO ABOUT 20 PERCENT BY WEIGHT OF AN ACID FROM THE GROUP CONSISITNG OF ACRYLIC ACID AND METHACRYLIC ACID, ALL BASED ON THE TOTAL WEIGHT OF SAID MIXTURE, SAID ACRYLONITRILE AMOUNTING TO FROM ABOUT ONE-TENTH TO ABOUT TWICE THE WEIGHT OF SAID AMIDE, THE COMBINED WEIGHT OF SAID ACRYLONITRILE AND SAID AMIDE BEING MORE THAN 50 PERCENT OF THE TOTAL WEIGHT OF SAID MIXTURE.