Moisture-curing, polyurethane hot-melt compositions
First Claim
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1. A hot-melt polyurethane composition, comprising:
- a mixture comprising a first polymer and second polymer, wherein the first polymer is a polyether-based polyurethane prepolymer having a glass transition point above room temperature, and which is prepared from an isocyanate and a polyether, the polyether polyol having a molecular weight between about 250 and 800, the mole ratio of the isocyanate groups to the hydroxyl groups of the isocyanate and the polyether polyol being from about 1.1 to 2.5, and wherein the second polymer is a polyurethane or polyurethane prepolymer and has a glass transition point below room temperature.
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Abstract
A quick-setting, moisture-curing hot-melt polyurethane composition having a first polyether-based polyurethane prepolymer having a Tg above room temperature and a second polyurethane prepolymer with a Tg below room temperature, the first prepolymer being prepared from a low molecular weight polyether; preferably the second prepolymer is also polyether based and prepared from a high molecular weight polyether.
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Citations
28 Claims
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1. A hot-melt polyurethane composition, comprising:
- a mixture comprising a first polymer and second polymer, wherein the first polymer is a polyether-based polyurethane prepolymer having a glass transition point above room temperature, and which is prepared from an isocyanate and a polyether, the polyether polyol having a molecular weight between about 250 and 800, the mole ratio of the isocyanate groups to the hydroxyl groups of the isocyanate and the polyether polyol being from about 1.1 to 2.5, and wherein the second polymer is a polyurethane or polyurethane prepolymer and has a glass transition point below room temperature.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 23)
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20. A hot-melt polyurethane composition, comprising:
- a mixture comprising a first polymer and second polymer, wherein the first polymer is a polyether-based polyurethane prepolymer having a glass transition point above room temperature, the first polymer formed from reagents comprising an isocyanate and a polyether polyol and is substantially free from other chain extenders, the mole ratio of isocyano groups to hydroxyl groups of the isocyanate and polyether polyol being from about 1.1 to 2.5, and wherein the second polymer is a polyurethane or polyurethane prepolymer and has a glass transition point below room temperature.
- View Dependent Claims (21, 22, 24, 25, 26, 27, 28)
Specification