| 摘要 |
1458007 Shoes, &c SHOE & ALLIED TRADES RESEARCH ASSOCIATION 26 Feb 1974 [27 Nov 1972] 54751/72 Addition to 1295677 Heading A3B [Also in Division C3] Synthetic or natural rubber shoe soles may be bonded to shoe uppers using an adhesive composition comprising a polyurethane adhesive solution having admixed therewith minor proportions respectively of an organic isocyanate an organic bromine donor and an organic chlorine donor. It is preferred that the surfaces to be bonded are coated with the adhesive composition and dried, and the adhesive is reactivated by heat and pressure during bonding. The shoe upper may be of PVC and the sole a thermoplastic block copolymer rubber, an SBR rubber or a crepe rubber. In preferred adhesive compositions, the isocyanate is a commercial polyisocyanate conventionally used in polyurethane formation, the organic bromine donor is dibromodimethyl hydantoin and the organic chlorine donor is trichloroisocyanuric acid. |
