Rubber compositions and method of treating rubber
AssigneeMonsanto Company
InventorChester D. Trivette
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Abstract
Rubber compositions comprising diene rubber and N-carbamoyl maleamic acid, N-thiocarbamoyl maleamic acid or derivatives thereof exhibit improved green strength or tack properties. Treatment of diene rubber above 130.degree. C. with the same compounds is shown to be effective in obtaining rubber compositions of improved properties.
Claims53
A composition comprising diene rubber containing a modifying amount of a compound of the formula ##STR7## in which R.sub.1, R.sub.2, and R.sub.3 are the same or different radicals selected from hydrogen, phenyl and alkyl of 1-10 carbon atoms, including cycloalkyl of 3-10 carbon atoms, optionally forming a heterocyclic moiety together with one or both of the N atoms of the formula, with or without an added hetero N or O atom, and Y is a sulfur or oxygen atom.
Method of treating diene rubber which comprises treating the diene rubber at an appropriate temperature above 130.degree. C. for a long enough time to impart to the diene rubber improved properties as to green strength or tack with a compound of the formula ##STR8## wherein R.sub.1, R.sub.2, and R.sub.3 are the same or different radicals selected from
- hydrogen,
- phenyl and
- alkyl of 1-10 carbon atoms, including cycloalkyl of 3-10 carbon atoms,
- optionally forming a heterocyclic moiety with one or both of the N atoms of the formula, together with or without an added hetero N or O atom,
- and
- Y is a sulfur or oxygen atom.
Dependencies are inferred from the claim text.