| 摘要 |
<p>The invention relates to a sulfur vulcanization process which comprises heating a sulfur-vulcanizable rubber composition comprising a rubber, sulfur, and a vulcanization accelerator, characterized in that the process is carried out in the presence of 0.1 to 5.0 parts by weight per 100 parts by weight of rubber of a coagent of formula I: <CHEM> wherein R<1> and R<2> independently represent H or a C1-C5 hydrocarbon group optionally containing one or more oxygen, nitrogen, sulfur, silicon and/or phosphorus atoms. A particularly effective hardness stabilizing coagent is dehydroacetic acid. The invention also relates to rubber articles, such as pneumatic tyres, comprising the rubber vulcanizate obtained by said process.</p> |
