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US 4,417,012 AGranted
Organic thiosulphates and thiosulphonates useful as stabilising agents for rubber vulcanisates
AssigneeMonsanto Europe S.A.
InventorPhilippe G. Moniotte
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AssigneeMonsanto Europe S.A.
InventorPhilippe G. Moniotte
Estimating the term…
Additives for rubber compositions, giving vulcanisates having improved retention of optimum physical properties, are compounds containing two or more groups of the formula --S--SO.sub.2 R linked by an organic bridging group, or polymers containing two or more groups of the formula --S--SO.sub.2 R attached to an organic polymer chain, where R represents (a) a radical OM where M is a monovalent metal, the equivalent of a multivalent metal, a monovalent ion derived by the addition of a proton to a nitrogenous base, or the equivalent of a multivalent ion derived by the addition of two or more protons to a nitrogenous base, or (b) an organic radical selected from aliphatic, cycloaliphatic, aromatic and heterocyclic radicals, and radicals which are combinations of any two or more such radicals.
A vulcanisable rubber composition comprising a diene rubber, sulphur and vulcanisation accelerator, characterised in that the composition also comprises a stabilizer material which is a compound having the formula ##STR34## where X' represents an alkylene radical or a radical comprising two or more alkylene units, pairs of such units being linked through an oxygen or sulphur atom, rhrough a group --SO.sub.2 --, --NH--, --NH.sub.2.sup.+ --, --N(C.sub.1-16 alkyl)- or --COO--, or through an arylene or cycloalkylene radical, X is the trivalent or tetravalent analogue of X1 and in addition may contain one or more Si groups to link pairs of alkylene radicals, n' has an integral value of at least 1, n" has the value 3 or 4, and M is a monovalent metal, the equivalent of a multivalent metal, a monovalent ion derived by the addition of a proton to a nitrogenous base, or the equivalent of a multivalent ion derived by the addition of two or more protons to a nitrogenous base.
A method of preparing a rubber vulcanisate having improved physical properties, which comprises incorporating sulphur and vulcanisation accelerator into a diene rubber together with an vulcanisate-stabilising amount of a stabiliser material which is a compound having the formula ##STR40## where X' represents an alkylene radical or a radical comprising two or more alkylene units, pairs of such units being linked through an oxygen or sulphur atom, through a group --SO.sub.2 --, --NH--, --NH.sub.2.sup.+ --, --N(C.sub.1-16 alkyl)- or --COO--, or through an arylene or cycloalkylene radical, X is the trivalent or tetravalent analogue of X' and in addition may contain one or more Si groups to link pairs of alkylene radicals, n' has an integral value of at least 1, n" has the value 3 or 4, and M is a monovalent metal, the equivalent of a multivalent metal, a monovalent ion derived by the addition of a proton to a nitrogenous base, or the equivalent of a multivalent ion derived by the addition of two or more protons to a nitrogenous base, and heating the mixture thus obtained at vulcanisation temperature.
Dependencies are inferred from the claim text.