The invention relates to a vulcanizable rubber composition comprising a rubber, sulfur or a sulfur donor, a vulcanization accelerator, a protective agent and 0.1 phr or more of an N,N′-disubstituted p-phenylenediamine protective agent is present in the form of a salt with an acid, and the composition does not comprise an elastomeric copolymer having glycidyl groups. The invention also relates to a vulcanization process comprising mixing and heating said rubber composition and to an article of manufacture comprising the rubber vulcanizate obtained by said process. Preferably, the acid is a C
1
-C
24
monocarboxylic acid or a C
2
-C
24
dicarboxylic acid, more preferably a C
12
-C
20
fatty acid such as stearic acid. Most preferably, the protective agent is 6PPD.
本发明涉及一种可
硫化橡胶组合物,该组合物包含橡胶、
硫磺或
硫磺供体、
硫化
促进剂、保护剂和 0.1 phr 或更多的 N,N′-二取代
对苯二胺保护剂,保护剂以酸盐形式存在,且该组合物不包含具有
缩水甘油基团的弹性共聚物。本发明还涉及一种
硫化工艺,包括混合和加热所述橡胶组合物,并涉及一种由通过所述工艺获得的橡胶
硫化胶组成的制造品。酸最好是 C
1
-C
24
单
羧酸或 C
2
-C
24
二
羧酸,更优选 C
12
-C
20
脂肪酸,如
硬脂酸。最优选的保护剂是 6PPD。