Polyurethane solvent-free powder adhesive - used to hot melt bond shoe outsole to bottom

摘要

The adhesive comprises a polyurethane derived from (a) isocyanate component consisting of a major amt. of a diccyclohexyl- or hydrogenated xylylene diisocyanate and (b) sufficient NCO-reactive component to provide a ratio of NCO to NCO reactive gps. of 0.95-1.10:1, pref. 0.975-1.025:1. Component (b) comprises (i) 45-25 mole % of a polyester diol. of mol. wt. is not 750, pref. 1000-2000 and an acid value of 2 and consisting of an ester of adipic acid and 1,4-butane- or 1,6-hexane diol and (ii) 55-75 mole % of 1,4-butane diol chain extender. The adhesive is generally in solvent-free powder form and exhibits good peel and creep strength. The adhesive may also be used to bond garment interlinings and fabrics.