申请人:THE FIRESTONE TIRE & RUBBER COMPANY
公开号:EP0286851A1
公开(公告)日:1988-10-19
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
wherein R is hydrogen, or a halogen, hydroxyl, lower hydrocarbyl, lower hydrocarbyloxy, lower hydrocarbylthio, lower hydrocarbyl nitrile, carboxyl, cyano, nitro, amino, amide or -C(O)-Rʹʺ where Rʹʺ is an aryl or a lower hydrocarbyl group; each Rʹ independently is H, lower alkyl, acyl, CONRʺ₂ or CONHRʺ where Rʺ 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.
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.
现已发现,通过在填充橡胶组合物中加入少量可改善性能的至少一种 1,3-二羟基苯并咪唑啉酮或衍生物化合物,可改善由具有不饱和碳链的橡胶组成的填充橡胶组合物的性能。
其中 R 是氢、或卤素、羟基、低级烃基、低级烃氧基、低级烃硫基、低级烃腈基、 羧基、氰基、硝基、氨基、酰胺或-C(O)-Rʹʺ,其中 Rʹʺ 是芳基或低级烃基;每个Rʹ独立地是H、低级烷基、酰基、CONRʺ₂或CONHRʺ,其中Rʺ是烷基或芳基。用此类未硫化橡胶组合物制备硫化胶时,硫化胶会表现出较低的应变滞后性和较高的电阻率。
在本发明的另一个方面,通过硫化上述类型的未硫化组合物并含有填料(尤其是炭黑)而制成的填充硫化胶,在填料相互作用、滞后、模量、压缩永久变形和弹性方面均有改善。利用本发明的改进型填充硫化胶,可制成橡胶制品及其部分,如轮胎、软管、皮带、弹簧、胎面、侧壁等。