Controlling premature curing of vulcanizable halogen-containing polymers
AssigneeHercules Incorporated
InventorJay Bernard Class
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Abstract
Controlling premature curing of vulcanizable halogen-containing polymer compounds.
Claims43
A process of reducing the effects of moisture during storage prior to vulcanization of a vulcanizable chlorine- or bromine-containing polymer composition containing water, comprising blending before storage, into said vulcanizable composition, about 1 to 20 phr of thioester derivative of 2,5-dimercapto-1,3,4-thiadiazole crosslinking agent and about 0.1 to 20 phr glycerin, whereby the scorch time t.sub.s 2 of the vulcanizable compound does not decrease by more than about 30% after storage in the presence of moisture for 1 day.
A process of reducing the effects of moisture during storage prior to vulcanization of a vulcanizable chlorine- or bromine-containing polymer composition containing water, comprising blending before storage, into said vulcanizable composition, about 1 to 20 phr of thioester derivative of 2,5-dimercapto-1,3,4-thiadiazole crosslinking agent and about 0.1 to 20 phr glycerin, whereby the scorch time of the vulcanizable compound is not significantly affected by the water content of said composition and wherein said composition contains about 0.05% to 2% of water at the start of vulcanization.
Dependencies are inferred from the claim text.