Diene rubber and method and composition for rubber treatment
AssigneeMonsanto Company
InventorsAubert Y. Coran, Chester D. Trivette, Jr.
Life of this patent
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Abstract
Improved tack, green strength or non-black filler interaction capability are realized in a treated diene rubber. The method of treating diene rubber to achieve the improvements is shown, together with a composition in which maleamic acid or derivatives of maleamic acid are combined with sulfur or an organic sulfur compound capable of generating a thiyl radical.
Claims62
A composition comprising diene rubber treated, in the presence of a modification promoting amount of (A) sulfur or an organic sulfur compound capable of generating thiyl radicals, by (B) a compound of the formula ##STR13## n being an integer of 1-3, wherein R.sub.1 is hydrogen or alkyl of 1-10 carbon atoms and, if n=1, R.sub.2 is selected from
- hydrogen,
- alkyl of 1-10 carbon atoms, optionally forming a heterocyclic moiety with the N atom of the formula and R.sub.1, either with or without an added N or O atom, ##STR14## wherein Y is an oxygen or sulfur atom, x is an integer of 1-12, R.sub.3 is:
- hydrogen, --COOH,
- alkoxy of 1-5 carbon atoms or ##STR15## R.sub.4 and R.sub.5 are the same or different selected from:
- hydrogen,
- phenyl and
- alkyl of 1-10 carbon atoms;
- if n=2, R.sub.2 is selected from phenylene, divalent aliphatic hydrocarbon radicals of 2-20 carbon atoms and ##STR16## and if n=3, R.sub.2 is s-triazinyl or a trivalent aliphatic hydrocarbon of 2-20 carbon atoms, said composition having been treated at a temperature of from 160.degree. to 210.degree. C. for a long enough time to impart to the compositin improved green strength, tack or non-black filler interaction capability.
A method of treating diene rubber comprising treating the rubber, in the presence of a modification promoting amount of (A) sulfur or an organic sulfur compound capable of generating thiyl radicals, with (B) a compound of the formula:
- ##STR20## n being an integer of 1-3, wherein R.sub.1 is hydrogen or alkyl of 1-10 carbon atoms and, if n=1, R.sub.2 is selected from
- hydrogen,
- alkyl of 1-10 carbon atoms, optionally forming a heterocyclic moiety with the N atom of the formula and R.sub.1, either with or without an added N or O atom, ##STR21## wherein Y is an oxygen or sulfur atom, x is an integer of 1-12, R.sub.3 is:
- hydrogen, --COOH,
- alkoxy of 1-5 carbon atoms or ##STR22## R.sub.4 and R.sub.5 are the same or different selected from:
- hydrogen,
- phenyl and
- alkyl of 1-10 carbon atoms, including cycloalkyl of from 3 to 10 carbon atoms;
- if n=2, R.sub.2 is selected from phenylene, divalent aliphatic hydrocarbon radicals of 2-20 carbon atoms and ##STR23## and if n=3, R.sub.2 is s-triazinyl or a trivalent aliphatic hydrocarbon of 2-20 carbon atoms, at a temperature of from 160.degree. to 210.degree. C. for sufficient time to impart to the composition improved green strength, tack or non-black filler interaction capability.
Dependencies are inferred from the claim text.