Method for heat-sealing textile materials with polyurethane adhesives
First Claim
1. A method for heat-sealing planar textile materials which comprises:
- (a) applying a heat-seal adhesive in the form of a spun-bonded fabric to a polyurethane coated fabric; and
(b) pressing said spun-bonded adhesive and polyurethane coated fabric together under heat and pressure to heat-seal said spun-bonded fabric to said polyurethane coated fabric;
wherein(c) said heat-seal adhesive is a polyurethane which melts below about 150°
C., prepared by reacting a solvent-free mixture of at least one diisocyanate, polybutylene glycol-ethylene glycol-adipic acid polyester having a molecular weight of about 1,000 to about 2,000 and an hydroxyl number of about 56, and a mixture of three diols comprising neopentyl glycol, diethylene glycol and 1,4-butane diol; and
in the ratio of isocyanate to hydroxyl groups of the reactants in said reaction mixture times 100 being from about 96 to about 100; and
said heat-seal adhesive has a melting range which is below about 125°
C.
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Abstract
The invention described herein relates to a method for heat sealing the opposing surfaces of planar textile materials which comprises applying a heat-seal adhesive to at least one of the opposing surfaces of the textiles, and then pressing the opposing surfaces of the textiles together under heat and pressure to heat-seal the textile surfaces together. The heat-seal adhesive employed is a low-melting polyurethane prepared by reacting at least one diisocyanate with at least one polyol having a molecular weight between about 500 and 5000, at least one diol which is branched or includes an ether group, and at least one diol which is unbranched. The diol reactants have an average molecular weight of less than about 500. The total hydroxyl group content of the reactants exceeds or equals the total isocyanate content of the reactants.
47 Citations
28 Claims
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1. A method for heat-sealing planar textile materials which comprises:
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(a) applying a heat-seal adhesive in the form of a spun-bonded fabric to a polyurethane coated fabric; and (b) pressing said spun-bonded adhesive and polyurethane coated fabric together under heat and pressure to heat-seal said spun-bonded fabric to said polyurethane coated fabric;
wherein(c) said heat-seal adhesive is a polyurethane which melts below about 150°
C., prepared by reacting a solvent-free mixture of at least one diisocyanate, polybutylene glycol-ethylene glycol-adipic acid polyester having a molecular weight of about 1,000 to about 2,000 and an hydroxyl number of about 56, and a mixture of three diols comprising neopentyl glycol, diethylene glycol and 1,4-butane diol; and
in the ratio of isocyanate to hydroxyl groups of the reactants in said reaction mixture times 100 being from about 96 to about 100; and
said heat-seal adhesive has a melting range which is below about 125°
C. - View Dependent Claims (2, 3, 4)
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5. A method of heat-sealing planar textile materials which comprises:
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(a) applying a heat-seal adhesive in the form of a spun-bonded fabric to at least one of the surfaces of a textile material, and (b) pressing said spun-bonded fabric and textile together under heat and pressure;
wherein(c) said heat-seal adhesive is a polyurethane adhesive which melts below about 150°
C., which is prepared by reacting a solvent-free mixture of a diisocyanate, a polybutylene glycol-ethylene glycol-adipic acid polyester, and a mixture of at least three diols wherein at least one diol is branched or includes an ether group, and at least one diol in said mixture is an unbranched diol, wherein the average molecular weight of said diols is less than about 500; and
wherein the ratio of isocyanate groups to hydroxyl groups in said reaction mixture times 100 is from about 96 to about 100. - View Dependent Claims (6, 7, 8, 22)
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9. A method for heat-sealing planar textile materials which comprises:
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(a) applying a heat-seal adhesive in the form of a spun-bonded fabric to at least one of the surfaces of a textile, and (b) pressing the opposing surfaces of said textile and spun-bonded fabric together under heat and pressure to heat-seal them together;
wherein(c) said heat-seal adhesive is a polyurethane which melts below about 150°
C., prepared by reacting a solvent-free mixture of at least one diisocyanate, a polyester having a molecular weight of from about 500 to about 5,000, and a mixture of at least three diols, wherein said diol mixture is comprised of at least one diol which includes an ether group, at least one branched diol and at least one unbranched diol component, and wherein the average molecular weight of said diols in said mixture is less than about 500; and
wherein the ratio of isocyanate groups to hydroxyl groups in the reaction mixture times 100 is from about 96 to about 100. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24, 25, 26, 27, 28)
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Specification