Adhesive composition comprising a polyisocyanate and a partially dissolved, partly suspended copolymer of vinyl chloride and vinyl acetate in organic solvent

Claim 1

A TYING ADHESIVE FOR IMPROVING THE UNION BETWEEN FIBROUS SHOE UPPER MATERIAL AND A SOLE OF THERMOPLASTIC POLYMERIC MATERIAL SOLIDIFIED FROM HEAT SOFTENED CONDITION IN CONTACT WITH SAID SHOE UPPER MATERIAL, SAID ADHESIVE COMPRISING A VOLATILE ORGANIC SOLVENT, FROM ABOUT 6% TO ABOUT 15% BY WEIGHT BASED ON THE WEIGHT OF THE ADHESIVE OF A HIGH MOLECULAR WEIGHT RESIN POLYMER OF VINYL CHLORIDE WITH UP TO 10% OF VINYL ACETATE HAVING AN INTRINCIS VISCOSITY OF AT LEAST 0.8 A PLASTICIZER FOR SAID RESIN AND AN AROMATIC POLYISOCYANATE, SAID RESIN BEING PARTIALLY DISSOLVED AND PARTLY SUSPENDED AS FINE PARTICLES IN SAID SOLVENT TO GIVE A VISCOSITY AT 25* C. OF BETWEEN ABOUT 300 AND ABOUT 400 CENTIPOISES BY SHEARING-TYPE AGITATOR BEATING IN SAID VOLATILE ORGANIC SOLVENT OF SAID RESIN AS PARTICLES OF WHICH PRIOR TO BEATING ALL PASS THROUGH A SEIVE HAVING OPENINGS OF 0.0166 IN. AND 80% PASS THROUGH A SIEVE HAVING OPENINGS OF 0.007 IN. TO EFFECT SOLUTION OF SAID RESIN TO AN EXTENT LEAVING UNDISSOLVED PORTIONS OF SAID RESSIN PARTICLES MICROSPICALLY OBSERVABLE, AND SAID POLYISOCYANATE BEING PRESENT IN AMOUNT OF 5% TO 100% BY WEIGHT BASED ON THE WEIGHT OF SAID RESIN.