Catalysts for the curing of a water-curable isocyanate-functional prepolymer
AssigneeMinnesota Mining and Manufacturing Company
InventorRichard S. Buckanin
Life of this patent
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Abstract
New catalysts useful in the curing of a water-curable isocyanate-functional prepolymer are provided. The new catalyst is a new 2,2'-dimorpholinyldialkyl ether. The use of the improved catalyst provides prepolymer/catalyst premix compositions having equivalent or increased shelf stability and which, when water-cured, yield resins having superior early strengths. A method of curing an isocyanate-functional prepolymer and articles useful as orthopedic bandages are also provided.
Claims17
A composition useful as a catalyst in the curing of a water-curable isocyanate-functional prepolymer comprising a substantially pure amino ether compound having the structural formula:
- ##STR7## wherein:
- each of R.sup.1 -R.sup.8 are individually hydrogen or lower alkyl;
- and
- R.sup.9 is a methyl group or a phenyl group wherein the phenyl group may have one or more lower alkyl substituents.
A composition comprising an isocyanate-functional prepolymer and an amino ether compound having the structural formula:
- ##STR8## wherein:
- each of R.sup.1 -R.sup.8 are individually hydrogen or lower alkyl;
- and
- R.sup.9 is a methyl group or a phenyl group wherein the phenyl group may have one or more lower alkyl substituents.
A method of curing an isocyanate-functional prepolymer comprising forming a mixture of water, a water-curable isocyanate-functional prepolymer and a catalytically effective amount of an amino ether compound having the structural formula:
- ##STR9## wherein:
- each of R.sup.1 -R.sup.8 are individually hydrogen or lower alkyl;
- and
- R.sup.9 is a methyl group or a phenyl group wherein the phenyl group may have one or more lower alkyl substitutents.
Dependencies are inferred from the claim text.