Rubber compositions modified with benzimidazolinones

Details Rubber compositions modified with benzimidazolinones Rubber compositions modified with benzimidazolinones

C - Chemistry, Metallurgy

08

K

6/123, 400/4905,

C08K 5/34 (2006.01) C07D 235/26 (2006.01) C08K 5/3447 (2006.01) C08L 21/00 (2006.01)

Patent

CA 1307608

- 25 - Title: RUBBER COMPOSITIONS MODIFIED WITH BENZIMIDAZO- LINONES ABSTRACT OF THE DISCLOSURE It now has been found that the properties of filled rubber compositions comprising rubbers having an unsaturated carbon chain can be improved by including therein, a minor property-improving amount of at least one 1,3-dihydroxy-benzimidazolinone or derivative compound of the formula Image ( I) wherein R is hydrogen, or a halogen, hydroxyl, lower hydrocarbyl, lower hydrocarbyloxy, lower hydrocarbyl- thio, lower hydrocarbyl nitrile, carboxyl, cyano, nitro, amino, amide or -C:(O)-R'" where R'" is an aryl or a lower hydrocarbyl group; each R' independently is H, lower alkyl, acyl, CONR"2 or CONHR" where R" is alkyl or aryl. When vulcanizates are prepared from such uncured rubber compositions, the vulcanizates exhibit reduced low strain hysteresis and a high electrical resistivity. -26- In another aspect of the invention, a filled vulcanizate made by vulcanizing uncured compositions of the type described above and containing a filler, particularly carbon black, is improved in filler interaction, hysteresis, modulus, compression set and resiliency. Rubber articles and portions thereof such as tires, hoses, belts, springs, tread, sidewalls and the like can be made utilizing the improved filled vulcanizates of the invention.

563931

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