SOLVENT-FREE LAMINATING ADHESIVE, CURED PRODUCT OF SAME, POLYOL COMPOSITION FOR LAMINATION ADHESIVES, AND MULTILAYER FILM
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United States of America Patent
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Feb 25, 2016
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Mar 20, 2015
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Abstract
Provided are a solvent-free laminating adhesive which enables a laminate after lamination to have a good appearance, and which enables a laminate to maintain a good appearance even when the laminate is formed by high-speed lamination; a cured product of the solvent-free laminating adhesive; a polyol composition for lamination adhesives, which serves as one component of the adhesive; and a multilayer film which uses the adhesive. A solvent-free laminating adhesive composition contains, as essential components, (A) a polyisocyanate component and (B) a polyol component. In the solvent-free laminating adhesive composition, the polyol component (B) contains (b1) castor oil or a hydroxyl group-containing castor oil derivative, and (b2) a polyalkylene glycol having a number average molecular weight of 2,500 to 7,000.
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