C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
400/8101, 400/92
C08F 20/04 (2006.01) C08F 2/32 (2006.01) C08F 220/04 (2006.01) C09D 7/00 (2006.01) C09D 11/02 (2006.01) D06P 1/52 (2006.01)
Patent
CA 1268579
ABSTRACT PRODUCTION OF POLYMERIC THICKENERS AND THEIR USE IN PRINTING A thickening agent that is partially suitable for alkaline print pastes is a water soluble, water swellable or water swollen polymer made by reverse phase polymerisation of a blend of copolymerisable monomers in which the monomers comprise at least one ethylenically unsaturated acid having free acid groups, at least one ethylenically unsaturated acid having salt groups selected from ammonium, amine and alkali metal and at least one ethylenically unsaturated cross-linking agent, the molar ratio of the said free acid groups to the said salt groups during the polymerisation being from 80:20 to 10:90. Cross-linked polymers formed from monomers including 0 to 3 or 15 to 45% acrylamide are particularly effective. Thickeners for printing pastes may be supplied as dispersions of substantially dry polymer particles in oil in which all the acid groups in the polymer are wholly neutralised with ammonia or a volatile amine.
472564
Borden Ladner Gervais Llp
Ciba Specialty Chemicals Water Treatments Limited
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