C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
400/7415
C08G 18/75 (2006.01) C08G 18/08 (2006.01)
Patent
CA 1089140
Abstract of the Disclosure A water-diluted, ungelled, non-sedimenting polyurethane and a process for preparing such a polyurethane in the presence of water is disclosed. The polyurethanes of the present invention are prepared by first dispersing an NCO-containing polymer in water, which is then chain extended with a material such as an organic diamine. Thermo- setting compositions can be made by adding curing agent to the chain extended material. Curing agents can also be incorporated into the polymer molecule either in the making of the partially reacted NCO- containing prepolymer or by further reaction with the partially reacted NCO-containing prepolymer. The water-dispersed polyurethanes of the present invention are excellent film formers, capable of making coatings with a wide spectrum of desirable properties. In addition, they can be added to other water-compatible compositions to improve flexibility, hardness, drying and other coating properties.
253299
Chang Wen-Hsuan
Scriven Roger L.
Borden Ladner Gervais Llp
Ppg Industries Inc.
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