Preparation of isocyanate-terminated polyurethanes...

Details Preparation of isocyanate-terminated polyurethanes... Preparation of isocyanate-terminated polyurethanes...

C - Chemistry, Metallurgy

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G

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C08G 18/28 (2006.01) C08G 18/46 (2006.01) C08G 18/50 (2006.01) C08G 18/64 (2006.01) C08G 65/32 (2006.01)

Patent

CA 1236247

PREPARATION OF ISOCYANATE-TERMINATED POLYURETHANES CONTAINING AMINO SILANES ABSTRACT A process is disclosed in which polyalkoxy amino silane adhesion promoters are incorporated into isocyanate-functional polyurethane resins formed by the reaction of a stoichiometric excess of organic polyisocyanate with an hydroxy-functional resin without producing cloudy and/or unstable resin solutions. In this process, the hydroxy-functional resin is prereacted with the alkoxy functionality of the amino silane in a reaction which liberates alcohol, and then a stoichiometric excess of the organic polyisocyanate is added to cause the isocyanate groups of the polyisocyanate to react with both the hydroxy groups and the amino hydrogen atoms present.

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