Partially chlorinated derivatives of rubber

Abstract

AbstractChlorinated rubbers containing from 1 to 17% of chlorine have been prepared by direct chlorination, at ordinary temperature, of crèpe rubber dissolved in carbon tetrachloride. It has been found that these products retain, to a greater or lesser degree, rubber‐like properties and are capable of hot or cold vulcanization with or without the addition of vulcanizing agents. The resulting vulcanizates have been shown to be considerably more resistant to the swelling action of solvents, and also to the action of chlorine, than corresponding products prepared from crèpe rubber. The resistance to swelling agents increased with increase of combined chlorine content; tensile strength and elasticity, however, decreased with increasing chlorine content. As expected, hardness increased with increase of chlorine content and vulcanizates from derivatives containing more than 10% combined chlorine were not sufficiently rubber‐like to warrant many experiments. It was found that fully Chlorinated rubber was compatible with partially chlorinated rubber and addition of the former was necessary for vulcanizates to pass the Post Office flame test for cables.