Reactive adhesive with enhanced adhesion to metallic surfaces
First Claim
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1. An aqueous adhesive composition comprising:
- a surface-deactivated solid isocyanate;
a first polyurethane dispersion including a first polyurethane having functional groups reactive with isocyanate; and
a second polyurethane dispersion including a second polyurethane different from the first polyurethane, the second polyurethane being a carboxylic acid functional polyurethane having an acid number of from 10 to 30, and a unimodal weight average molecular weight (Mw) of no greater than about 50,000 g/mole.
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Abstract
Disclosed is an aqueous adhesive composition including a surface-deactivated solid isocyanate and a blend of two different polyurethanes. A method of making an article that includes a coated adhesive layer and article made thereby are also disclosed.
38 Citations
26 Claims
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1. An aqueous adhesive composition comprising:
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a surface-deactivated solid isocyanate; a first polyurethane dispersion including a first polyurethane having functional groups reactive with isocyanate; and a second polyurethane dispersion including a second polyurethane different from the first polyurethane, the second polyurethane being a carboxylic acid functional polyurethane having an acid number of from 10 to 30, and a unimodal weight average molecular weight (Mw) of no greater than about 50,000 g/mole. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. An article comprising:
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a substrate, and an adhesive layer disposed on at least one major surface of the substrate, the adhesive layer comprising a surface-deactivated solid isocyanate, a first polyurethane having functional groups reactive with isocyanate, and a second polyurethane different from the first polyurethane, the second polyurethane being a carboxylic acid functional polyurethane having an acid number of from 10 to 30, and a unimodal weight average molecular weight (Mw) of no greater than about 50,000 g/mole. - View Dependent Claims (22, 23, 24, 25, 26)
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Specification