C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
C08K 5/19 (2006.01) C08L 21/00 (2006.01)
Patent
CA 2403354
The invention relates to a vulcanizable rubber composition comprising a rubber, sulfur or a sulfur donor, a vulcanization accelerator, and a protective agent and is characterized in that 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 C1-C24 monocarboxylic acid or a C2-C24 dicarboxylic acid, more preferably a C12-C20 fatty acid such as stearic acid. Most preferably, the protective agent is 6PPD.
L'invention concerne une composition à base de caoutchouc vulcanisable comprenant un caoutchouc, du soufre ou un donneur de soufre, un accélérateur de vulcanisation, et un agent de protection. Cette composition est caractérisée par le fait que 0,1 phr ou plus d'un agent de protection à base de p-phénylènediamine N,N'-disubstitué est présent sous forme d'un sel avec un acide, et que la composition ne comprend pas de copolymère élastomère comprenant des groupes glycidyle. L'invention concerne également un procédé de vulcanisation consistant à mélanger et à chauffer ladite composition à base de caoutchouc, ainsi qu'un article de fabrication comprenant ce vulcanisat à base de caoutchouc obtenu à l'aide de ce procédé. De préférence, l'acide est un acide monocarboxylique C¿1?-C¿24? ou un acide dicarboxylique C¿2?-C¿24?, plus avantageusement un acide gras C¿12?-C¿20?, tel que de l'acide stéarique. Plus avantageusement, l'agent de protection est 6PPD.
Datta Rabindrah Nath
Talma Auke Gerardus
Flexsys B.v.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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