C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 283/00 (2006.01) C08J 5/18 (2006.01) C09D 151/08 (2006.01) C09J 151/08 (2006.01)
Patent
CA 2052867
Abstract of the disclosure: Graft polymers on carboxyl-containing polyurethane graft bases, process for their preparation, and their use. Carboxyl-containing graft polymers in which vinyl car- boxylates and, if desired, further ethylenically unsatur- ated monomers are grafted polymerically onto carboxyl- containing polyurethane graft bases by means of free radical-initiated graft polymerization, and hydrolysis products and salts of these carboxyl-containing graft polymers, can be obtained by grafting vinyl carboxylates having 3 to 20 carbon atoms and, if desired, further ethylenically unsaturated polymerizable and, where appropriate, copolymerizable monomers onto a carboxyl- containing polyurethane graft base containing at least two urethane groups in the molecule, in amounts of, preferably, from 10 to 95 % by weight, based on the carboxyl-containing graft polymer, by free radical- initiated graft polymerization, and subsequently, if desired, hydrolyzing all or some of the vinyl ester units and any other hydrolyzable monomer units in the grafted- on polymer radicals of the graft polymers using water and/or an alcohol, or converting the carboxyl groups into salts. Preferred vinyl esters to be grafted on are vinyl acetate and/or vinyl propionate and, if desired, vinyl versatate. The graft polymerization is preferably carried out in solution or without a solvent. Unhydrolyzed graft polymers are suitable, inter alia, as adhesives, in particular as hot-melt adhesives, and, in their water-soluble or water-dispersible salt forms, as dispersants. Fully or partially hydrolyzed graft polymers are suitable, inter alia, for the production of films. Depending on the carboxyl group content of the polyur- ethane graft base, the degree of grafting, the degree of hydrolysis and the type of grafted monomers, the graft polymers have significantly improved solubilities in aqueous-alkaline media and reduced melting points com- pared with polyvinyl alcohol, so that they are advantage- ously suitable for the production of pressed and extruded films under mild temperature conditions without the additional use of organic plasticizers. Hydrolyzed graft polymers are furthermore suitable, inter alia, as adhesives, as dispersants in aqueous-alkaline media and as sizes and textile lubricants in textile processing.
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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