Monsanto Company

Flexsys America L.p.

Otto W Maender

Gene R Wilder

Eiichi Morita

Horng-Jau Lin

Alan Roy Katritzky

Frederick Ignatz-Hoover

Donald L Fields, Jr

Helmut L Merten

Chester D Trivette, Jr

Jayant S Lodaya

Thomas B Rauchfuss

Rabindra Nath Datta

Robert L Wright

Raymond Anton Lohr, Jr

Paul M Mitchem

Charles John Rostek

Herman Howard Odens

Michael Victor Voronkov

A composition comprising alkylthio- or aryl(heteroyl)thio-substituted p-phenylenediamine, its method of preparation, and its use as an antidegradant in natural or synthetic rubber.

Alkylthio- and aryl(heteroyl)thio-substituted p-phenylenediamines, their manufacture and their use in rubber

A vulcanizable composition comprising a sulfur vulcanizable rubber, a sulfur vulcanizing agent, an accelerating agent selected from the group consisting of non-thiazole sulfenamide accelerators in an amount effective to not substantially inhibit vulcanization and an amount effective to improve the hardness stabilization of said rubber upon vulcanization of a hardness stabilization agent comprising a pyrimidine derivative. A method of improving the hardness stabilization of a composition comprising a sulfur vulcanizable rubber by adding to said composition the accelerators and pyrimidine derivative.

Pyrimidine derivatives as hardness stabilizers

The invention comprises a vulcanizable composition comprising a sulfur vulcanizable rubber, a sulfur vulcanizing agent, an accelerating agent in an amount effective to accelerate vulcanization and sufficient to not substantially inhibit vulcanization, and an amount effective to improve the hardness stabilization of said rubber upon vulcanization of a pyrimidine derivative. The invention also comprises a method of improving the hardness stabilization of a composition comprising a sulfur vulcanizable rubber by adding the above accelerating agent and pyrimidine derivative to the composition.

A process for the manufacture of zinc hexasulfide amine complexes comprising reacting zinc, sulfur and a molar excess of amine at an elevated temperature to obtain a reaction mixture comprising zinc hexasulfide amine complexes and excess amine. A first solvent in which the zinc hexasulfide amine complexes are largely not soluble is added to obtain a slurry of the reaction mixture. The zinc hexasulfide amine complexes may be recovered in a subsequent separation process.

Manufacture of zinc hexasulfide amine complexes

Rubber compositions which contain a complex of zinc hexasulfide with an amine, together with a vulcanization accelerator exhibit favorable vulcanization behavior, and their vulcanizates show improved properties.

Rubber compositions containing zinc hexasulfide complexes

A phenylenediamine compound can be converted, with high selectivity, into its corresponding quinonediimine by reacting the phenylenediamine with oxygen in the presence of a modified activated carbon catalyst in an aqueous system.

Formation of quinonedimines from phenylenediamines by catalytic oxidation

Nitrodiarylamines, useful as intermediates, are produced by combining a formyl derivative of an aromatic primary amine with a nitrohaloarene, at condensation temperature for forming nitrodiarylamine, and adding an alkoxide or cycloalkoxide of an alkali metal, excluding lithium.

Making nitrodiarylamines

Alkyl thiosalicylate prevulcanization inhibitors having a pleasant odor are described. Claimed compounds include those of the formula: ##STR1## in which X is an amide inhibitor moiety attached through the nitrogen atom derived from the group consisting of 2-benzimidazolinone, 2-imidazolidinone, 2-benzothiazolone, 2-thiazolone, phthalimide, succinimide, glutarimide, hexahydrophthalimide, maleimide, hydantoin, urea, napthalimide, oxamide, oxanilide, phenylcarbamic acid ester, formamide, formanilide, acetamide, benzamide, acetanilide, benzanilide, propionamide, butyramide, pivalamide, valeramide and hexanamide, R is alkyl of 1-8 carbon atoms, R' is alkyl of 1-8 carbon atoms, alkoxy of 1-8 carbon atoms, --CO.sub.2 --R, or halo, and n is 0, 1 or 2.

Fragrant prevulcanization inhibitors

Vulcanizable rubber compositions are described which are inhibited from premature vulcanization by activated methylene di(thioethers) in which the adjacent activating groups are either carbonyl or cyano. Novel compounds are also described.

Methylene thioethers

Alkyl thiosalicylate prevulcanization inhibitors having a pleasant odor are described.

Vulcanizable rubber compositions inhibited from premature vulcanization by incorporation of hindered alkylthioimidazolidinetriones are described.

Alkylthioimidazolidinetriones

Vulcanizable rubber compositions inhibited from premature vulcanization

Forming nitrodiarylamines by reacting the formyl derivative of an aromatic amine, a nitrohaloarene, and a proton abstractor which is sodium carbonate or bicarbonate with or without a reaction promoting amount of a compound of potassium, cesium, rubidium or mixture thereof.

Promoting the formation of nitrodiarylamines from nitrohaloarenes,

Scorch inhibited vulcanizable rubber compositions

Promoting the reaction of sodium salts of formyl derivatives of aromatic amines by compounds of potassium, cesium or rubidium to form nitrodiarylamines is disclosed.

Growing community of inventors

Copley, OH, United States of America

Otto W Maender