Humidity-reactive hotmelt adhesive with increased open time
First Claim
1. Moisture-reactive hotmelt adhesive composition comprisinga) at least one polyurethane prepolymer P1 containing isocyanate groups and being liquid at room temperature, andb) at least one linear polyurethane P2 being solid at room temperature which comprises polycaprolactone segments, contains hydroxyl groups and has a melt viscosity of 100-300 Pa·
- s at 170°
C.whereinthe prepolymer P1 is obtained through a reaction of at least one polyisocyanate with at least one polyol, the polyol being a polyoxyalkylene diol or a polyoxyalkylene triol having a degree of unsaturation of lower than 0.02 meq/g and a molecular weight of 1,000 to 30,000 g/mol.
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Accused Products
Abstract
The invention relates to moisture-reactive hotmelt adhesive compositions which comprise at least one polyurethane prepolymer P1 being liquid at room temperature containing isocyanate groups and also at least one linear polyurethane P2 being solid at room temperature which comprises polycaprolactone segments, contains hydroxyl groups and has a melt viscosity of 100-300 Pa·s at 170° C. The compositions are notable in particular for a prolonged open time.
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Citations
19 Claims
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1. Moisture-reactive hotmelt adhesive composition comprising
a) at least one polyurethane prepolymer P1 containing isocyanate groups and being liquid at room temperature, and b) at least one linear polyurethane P2 being solid at room temperature which comprises polycaprolactone segments, contains hydroxyl groups and has a melt viscosity of 100-300 Pa· - s at 170°
C.wherein the prepolymer P1 is obtained through a reaction of at least one polyisocyanate with at least one polyol, the polyol being a polyoxyalkylene diol or a polyoxyalkylene triol having a degree of unsaturation of lower than 0.02 meq/g and a molecular weight of 1,000 to 30,000 g/mol. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- s at 170°
Specification