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US 6,635,722 B2Granted
Moisture-curable polyurethane hot melt adhesives containing reactive amine catalysts
AssigneeHenkel Corporation
InventorsYingjie Li, Jason D. Lohrey
Life of this patent
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Abstract
A catalyzed reactive hot melt adhesive, a method for improving the cure rate and a method for making thereof. The adhesive includes the reaction product of a reactive polyurethane adhesive and a catalytically effective amount of at least one amine catalyst with at least one active hydrogen.
Claims12
A catalyzed reactive hot melt adhesive comprising before moisture curing:
- (a) a reactive, moisture-curable polyurethane adhesive;
- and
- (b) a catalytically effective amount comprising 0.005 to 0.1% by weight of at least one tertiary amine non-fugitive catalyst containing at least one active hydrogen, that provides at least one functional group that is capable of reacting with one or more isocyanate groups in a polyurethane prepolymer,
- so that the catalytically effective amount is incorporated into the polyurethane and a thermoset adhesive derived therefrom and so that the catalyzed reactive hot melt adhesive is formed in a non-volatile maimer at an accelerated curing rate.
1 more element
A method for shortening the moisture curing time of a moisture-curable polyurethane hot melt adhesive comprising the step of:
- incorporating therein about 0.005 to about 0.1% by weight of one tertiary amine non-fugitive catalyst containing at least one active hydrogen, that provides at least one functional group that is capable of reacting with one or more isocyanate groups in a polyurethane prepolymer,
- so that the catalytically effective amount is incorporated into the polyurethane and a thermoset adhesive derived therefrom and so that the catalyzed reactive hot melt adhesive is formed in a non-volatile manner at an accelerated curing rate.
A method of making a catalyzed reactive hot melt adhesive comprising:
- providing a moisture-curable polyurethane adhesive;
- and
- providing a catalytically effective amount comprising 0.005 to 0.1% by weight of at least one tertiary amine non-fugitive catalyst containing at least one active hydrogen, that provides at least one functional group that is capable of reacting with one or more isocyanate groups in a polyurethane prepolymer,
- so that the catalytically effective amount is incorporated into the polyurethane and a thermoset adhesive derived therefrom and so that the catalyzed reactive hot melt adhesive is formed in a non-volatile manner at an accelerated curing rate.
1 more element
Dependencies are inferred from the claim text.