Storage stable, one-package heat curable polyurethane...

Details Storage stable, one-package heat curable polyurethane... Storage stable, one-package heat curable polyurethane...

C - Chemistry, Metallurgy

08

G

402/147, 400/742

C08G 18/73 (2006.01) C09J 5/00 (2006.01) C09J 3/16 (1985.01)

Patent

CA 1237849

STORAGE STABLE, ONE-PACKAGE HEAT CURABLE POLYURETHANE ADHESIVE COMPOSITIONS ABSTRACT New and improved storage stable, one package, heat curable polyurethane adhesive compositions are disclosed which comprise: (a) a mixture of or a prepolymer adduct of: (i) an excess of a poly aliphatic isocyanate compound of the formula: Image wherein R and R' are each, independently, hydrogen , alkyl or substituted alkyl and X is a bridging means selected from divalent ali- phatic, cycloaliphatic or aromatic groups, and (ii) at least one monomeric or polymeric compound containing a plurality of hydroxyl groups, in admixture with (b) a stoichiometric amount of a curing agent comprising a monomeric or polymeric compound having at leat three hydroxyl groups at least one of which is a secondary hydroxyl group, and (c) optionally, an inert filler. The compositions are curable upon exposure to elevated temperatures of from about 100°-200°C to form high tensile strength, high adhesive strength bonds to a variety of substrates. The compositions have extended pot lives of up to six weeks and exhibit storage stability for up to six months.

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