Thermoplastic reinforcing adhesives and substrates coated therewith

Claim 1

A reinforced box-toe construction comprising a flexible substrate selected from leather, fabric or vinyl polymer and having applied thereto an adherent copolyamide resin consisting essentially of the reaction product of (a) a mixture of a polymeric fatty acid, obtained from the polymerization of an olefinically unsaturated monocarboxylic acid containing from 16 to 20 carbon atoms, and a saturated aliphatic dicarboxylic acid having from 7 to 12 carbon atoms, the equivalents ratio of the respective acid components ranging from about 0.95:0.05 to about 0.7:0.3, with (b) a mixture of a saturated aliphatic diamine having from 2 to 6 carbon atoms and a polyoxyalkylene diamine of the formula ##STR2## where R is hydrogen or a methyl group and m is a positive integer so that the average molecular weight of the polyoxyalkylene diamine is between 600 and 5000, the equivalents ratio of said aliphatic diamine to said polyoxyalkylene diamine ranging from about 0.92:0.08 to 0.995:0.005, said resin having a softening point in the range 140°-190° C., 190° C. viscosity less than 150 poise, compression strength greater than 85 grams and brittleness temperature less than -10° C., and said adherent copolyamide resin present on the substrate to a thickness of 1 to 50 mils.