Abstract
Among chemical derivatives of rubber, there is a type to which has been given the name of isorubbers or cyclorubbers in the technical literature. Kirchhof has described at length these products, which can be prepared by various methods, e.g., by the action of heat, as described by Harries, who isolated a white amorphous powder, having a density of 0.992, by heating rubber for several hours in ether at 250–300°, under pressure, or by the action of chemical reagents, particularly sulfuric acid and inorganic and organic halogenated compounds, with which a range of products suitable for molding powders, paints, sheets, wire, etc., can be prepared. The present work is concerned, not with a further study of these products, but rather with an investigation of a particular one of these products, viz., that which is obtained by treating rubber with phenolsulfonic acid. The B. F. Goodrich Company, and Fisher in particular, have successfully developed the manufacture and use of this product, and have given it the generic and commercial name of Thermoprene. At the beginning, a large number of applications of Thermoprene were foreseen, but only one application has survived and undergone any extensive development, viz., the use of Thermoprene as an adhesive for bonding rubber to metal, a process known as the Vulcalock process. As a result of newly observed facts, it seemed of interest to take up this problem again in an attempt to improve the process in certain ways.
Substitution Reaction of Organic Halogenated Compounds with Anion Exchange Resins
