Abstract
Abstract Neoprene Type W, as a polymer, represents a fundamental departure from Neoprene Type GN in the manufacture of chloroprene polymers. This new Neoprene is more stable than any of its predecessors, and it contains no sulfur or chemicals which may decompose to give free sulfur or a vulcanization accelerator. Although its compounds should include both magnesium oxide and zinc oxide, Type W also requires acceleration. Many conventional Neoprene and rubber accelerators can be used. Certain of the rubber accelerators, such as diphenylguanidine or the butyraldehyde-aniline condensation products, require sulfur. Others, such as 2-mercaptothiazoline and tetramethylthiuram monosulfide, as well as the common Neoprene accelerators, such as the di-o-tolylguanidine salt of dicatechol borate, may be used without sulfur. Neoprene Type W vulcanizates differ from those of Type GN by having a stress-strain curve more nearly approaching that of natural rubber and by having much greater resistance to compression set. The resistance to compression set of Neoprene Type W vulcanizates is greater than that of the best natural rubber stock.
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