| abstract |
This invention relates to an improvement of the adhesion of a metallic material such as copper, copper alloys and other metals coated therewith with a vulcanizable rubber composition. It is realized by previously adding orthoboric acid or a metal borate to the rubber composition in order to proceed with metal-rubber bonding reaction and vulcanization reaction in good balance, and vulcanizing an assembly of the metallic material and the boric compound containing rubber composition closely contacted therewith. |