Abstract
AbstractIt is shown that chlorosulfonated polyethylenes heated with divalent metal oxides or hydroxides and rosin acids in the presence of trace amounts of free‐radical scavengers crosslink exclusively by formation of metal–sulfonate bonds. Vulcanizate properties are independent of the nature and concentration of free‐radical scavengei, and it is suggested that these agents prevent decomposition of the sulfonyl chloride crosslinking sites, thus allowing efficient reaction with the salt‐forming components of the system. This technique allows the curing of chlorosulfonated polyethylenes in direct contact with copper and lead without development of the adhesion or discoloration usually encountered in sulfur‐containing systems.
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