C - Chemistry – Metallurgy – 08 – G
Patent
C - Chemistry, Metallurgy
08
G
402/134, 400/740
C08G 18/10 (2006.01) C08G 18/08 (2006.01) C08G 18/32 (2006.01) C08G 18/80 (2006.01) C09D 175/04 (2006.01)
Patent
CA 1204246
Abstract A method of preparing a storage-stable one-part reactive liquid thermal curing polymeric coating composi- tion from an isocyanate-functional polymeric compound which has a substantial portion of its isocyanate groups masked with an isocyanate masking agent, and a crosslinking agent which is substantially insoluble in aprotic solvents. These liquid compositions are homogeneous even when free of solvents. Preferably the crosslinking agent is a crystalline polyol. The method involves the synthesis of a solubilizing oligomer which is formed by the partial reaction of the crosslinking agent and the unmasked isocyanate-functional polymeric compound. The thermal curing of these compositions results in polymeric coatings which possess superior physical properties. These cured coatings are particularly useful in the manufacture of retroreflective sheeting.
417755
Minnesota Mining And Manufacturing Company
Smart & Biggar
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