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US 4,695,609 AGranted
Vulcanizable rubber compositions containing xanthogen polysulfide and xanthate compounds
AssigneeRobinson Brothers Limited
InventorArthur Stevenson
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Abstract
A novel mixture comprises a dihydrocarbyl xanthogen polysulphide and a xanthate selected from metal hydrocarbylxanthates and dihydrocarbylxanthates. Such a mixture can be used to cure a vulcanizable rubber composition containing less than 0.4 parts by weight of nitrosatable materials per 100 parts by weight rubber; the use of toxic conventional nitrogen-containing accelerators such as amines can be avoided.
Claims12
A vulcanizable composition which comprises 100 parts by weight rubber;
- from about 1 to about 6 parts by weight dihydrocarbyl xanthogen polysulfide of the formula R.sup.1 O--CS--S.sub.x --SC--OR.sup.2 wherein R.sup.1 and R.sup.2 are the same or different and selected from the group consisting of alkyl, cycloalkyl and N-free heterocyclic groups and x is an integer of at least 2;
- from about 0.01 to about 5 parts by weight of a xanthate compound selected from the group consisting of dihydrocarbyl xanthates and metal hydrocarbylxanthates of the formula R.sup.4 O--CS--S--R.sup.5 wherein R.sup.4 is selected from the group consisting of alkyl, cycloalkyl and N-free heterocyclic groups and R.sup.5 is selected from the group consisting of a metal and R.sup.4 ;
- and less than 0.4 parts by weight of nitrosatable materials.
Dependencies are inferred from the claim text.