Method for rubber treatment
AssigneeMonsanto Company
InventorsAubert Y. Coran, Charles P. Rader, Chester D. Trivette, Jr.
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Abstract
The method of masticating diene rubber in the presence of maleic acid or maleic anhydride together with sulfur or an organic sulfur compound capable of generating a thiyl radical is shown. Improved tack, green strength or both are realized in the treated diene rubber.
Claims39
The method of improving the properties of diene rubber comprising masticating solid diene rubber, in the presence of a modification promoting amount of (A) sulfur or an organic sulfur compound capable of generating thiyl radicals, with (B) maleic acid or anhydride at an appropriate temperature above 130.degree. C. for a time sufficient to increase the green strength or tack of the diene rubber but insufficient to decrease its tack, wherein the time is from 0.1 to 20 minutes and (A) and (B) are present in amounts of from 0.01-15 and 0.1-20 parts by weight, respectively, per 100 parts diene rubber by weight.
Dependencies are inferred from the claim text.