Heat-meltable polymer for use as adhesive agent, method for manufacturing the same and application thereof for the gluing of substrate materials
First Claim
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1. A heat-meltable polymer, adapted for use as an adhesive agent, formed of a block prepolymer having polycaprolactone and polyurethane sequences and comprising:
- (a) a polycaprolactone-based resin having from about 0.7 to 1.5 percent free OH groups per mole of the heat-meltable polymer;
(b) a low melting point polyol; and
(c) a diisocyannate having a function rate from about 1.1 to 4 and having from about 1 to 5 percent free NCO groups per mole of the heat-meltable polymer.
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Abstract
A heat-meltable polymer, adapted for use as an adhesive agent, which contains a block prepolymer comprising polyurethane and polycaprolactore sequences and a free NCO group rate comprised between 1% and 5%.
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Citations
19 Claims
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1. A heat-meltable polymer, adapted for use as an adhesive agent, formed of a block prepolymer having polycaprolactone and polyurethane sequences and comprising:
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(a) a polycaprolactone-based resin having from about 0.7 to 1.5 percent free OH groups per mole of the heat-meltable polymer; (b) a low melting point polyol; and (c) a diisocyannate having a function rate from about 1.1 to 4 and having from about 1 to 5 percent free NCO groups per mole of the heat-meltable polymer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A heat-meltable polymer, adapted for use as an adhesive agent, formed of a block prepolymer having polycaprolactone and polyurethane sequences and comprising:
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(a) from about 10 to 40 percent by weight of a polycaprolactone-based polyester resin having form about 0.7 to 1.5 percent free OH groups per mole of the heat-meltable polymer, an average molecular weight of 30,000 to 40,000, a melting point of about 60° and
a vitreous transition temperature of about -60°
;(b) from about 40 to 80 percent by weight of a low melting aliphatic homopolyester polyol having hydroxyl end groups, a molecular weight of from about 2,000 to 6,000, and a hydroxyl index between about 20 and 100; and (c) from about 10 to 30 percent by weight of a diisocyanate having a function rate from about 1.1 to 4 and having from about 1 to 5 percent free NCO groups per mole of the heat-meltable polymer. - View Dependent Claims (16, 17, 18, 19)
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Specification