Polyurethane sealant compositions
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United States of America Patent
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Jan 28, 2003
Grant Date -
N/A
app pub date -
Feb 4, 2000
filing date -
Feb 5, 1999
priority date (Note) -
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Abstract
In one aspect, this invention is a polyurethane sealant composition comprising (1) a urethane prepolymer having an isocyante functionality of at least about 2.0 and a weight average molecular weight of at least about 2,000; (2) a catalytic amount of a tin compound which catalyzes the reaction of isocyanate moieties with water or an active hydrogen containing compound; and (3) a stabilizing amount of an organophosphite which has an alkaryl ligand or both an aliphatic ligand and an aromatic ligand. The prepolymer may further comprises silane functionality or the composition may further comprise a compound or polymer which contains silane moieties and is compatible with the polyurethane prepolymer. The invention is also a method for bonding glass to a substrate which comprises contacting a sealant according to the invention with glass and another substrate with the sealant disposed between the glass and substrate and thereafter allowing the sealant to cure so as to bond the glass to the substrate.
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