Tack free surface cures of polymers by organic peroxides in...

C - Chemistry – Metallurgy – 08 – G

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C08G 77/08 (2006.01) C08K 5/3415 (2006.01)

Patent

CA 2359148

Compositions are disclosed which comprise mixtures of at least one compound selected from silicone elastomers, bis-, tri- or higher polymaleimides and/or bis-, tri- or higher polycitraconimides, and at least one compound selected from p-phenylene-diamine based antiozonants, sulfur compounds capable of accelerating sulfur vulcanization of polymers capable of being crosslinked by sulfur and polysulfide polymers which when compounded into polymers curable by free radical initiators in the presence of free radical initiators permit substantially tack free surface cure of the polymers by decomposition of the free radical initiator in the presence of molecular oxygen. Compositions containing the above ingredients and at least one free radical initiator, curable compositions containing the combination and processes for making and using the compositions are also disclosed.

L'invention concerne des compositions qui comprennent des mélanges d'au moins un composé choisi dans le groupe constitué par des élastomères de silicone, des bis-, tri- ou plus, polymaléimides, et/ou des bis-, tri- ou plus, polycitraconimides, ainsi qu'au moins un composé choisi dans des composés soufrés, anti-ozone, à base de p-phénylène-diamine et capables d'accélérer la vulcanisation au soufre de polymères pouvant être réticulés par le soufre, et celle de polymères de polysulfure, lesquels, lorsqu'ils sont composés en polymères pouvant durcir sous l'effet d'initiateurs de radicaux libres, en présence d'initiateurs de radicaux libres, permettent un durcissement de surface sensiblement non collant des polymères par décomposition de l'initiateur de radicaux libres en présence d'oxygène moléculaire. L'invention concerne encore des compositions contenant les ingrédients ci-dessus ainsi qu'au moins un initiateur de radicaux libres, des compositions pouvant durcir et contenant la combinaison de composés ci-dessus, ainsi que des procédés de fabrication et d'utilisation de ces compositions.

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