C - Chemistry – Metallurgy – 08 – K
Patent
C - Chemistry, Metallurgy
08
K
C08K 13/02 (2006.01) C08K 3/26 (2006.01) C08K 5/06 (2006.01) C08K 5/09 (2006.01) C08K 5/39 (2006.01) C08L 15/02 (2006.01) C08L 23/28 (2006.01)
Patent
CA 2231519
The invention provides for cured elastomer compositions containing halobutyl rubber and/or halogenated copolymer of isobutylene and para-methylstyrene which exhibit very low compression set values at temperatures as high as about 200 ~C. The composition contains a specific curing system mixture based on a dialkyl- or diaryl-dithiocarbamate salt, a finely divided hydrotalcite and a polyalkylene glycol, and also preferably contains zinc oxide and stearic acid.
L'invention concerne des compositions élastomères durcies à base de caoutcouch halogénobuthyle et/ou de copolymère halogéné d'isobuthylène et de paraméthylstyrène offrant une très faible compression par rémanence à des températures élevées qui peuvent attaindre environ 200 ·C. Ces compositions renferment un mélange spécifique pour le durcissement, qui est constitué d'un sel de dialkyle- ou de diaryle-dithiocarbamate, d'un hydrotalcite finement réparti et d'un polyalkylèneglycol, et aussi, de préférence, d'oxyde de zinc et d'acide stéarique.
Borden Ladner Gervais Llp
Exxon Chemical Patents Inc.
Exxonmobil Chemical Patents Inc.
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