Faster preparation of polyurethane coating solutions

Details Faster preparation of polyurethane coating solutions Faster preparation of polyurethane coating solutions

C - Chemistry, Metallurgy

08

G

400/7416

C08G 18/10 (2006.01) C08L 75/04 (2006.01) C08L 75/12 (2006.01)

Patent

CA 1069237

METHOD OF PREPARING SOLVENT-BASED COATING SOLUTIONS Abstract of the Disclosure Disclosed is a novel procedure for making solvent- based polyurethane or polyurethane-polyurea compositions which makes it possible to avoid the production of compo- sitions that are undesirably underpolymerized or over polymerized. Moreover, the invention shortens the over-all time required to produce the composition. In essence, the invention involves a reversal in the order of steps usually \ used for making compositions of this sort: after a desired quasi-prepolymer of polyisocyanate and polyol is formed, a relatively small amount of secondary amine is added. The main polymerization with polyols and/or polyamines and the like is then permitted to take place. Desirably, as a last step, a suitable quantity of monoisocyanate is added to react with any unreacted amine groups and yield a final solution that has no reactive groups and has consequently an excellent pot life. -1-

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