Crosslinkable rubber composition

C - Chemistry – Metallurgy – 08 – J

Patent

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402/158

C08J 3/24 (2006.01) C08C 19/30 (2006.01) C08G 18/69 (2006.01) C08G 18/72 (2006.01)

Patent

CA 2004541

It is sometimes desirable to cure rubber compositions utilizing non-sulfur curing agents. The subject invention reveals rubber compositions which can be cured without utilizing sulfur or sulfur containing compounds. The subject invention more specifically discloses a rubber composition which can be crosslinked by heating which is comprised of (1) at least one rubber having pendant blocked isocyanate groups bound thereto; and (2) at least one compound which contains at least 2 Zerewitinoff active hydrogens. This invention also discloses crosslinking of elastomer compounds containing (1) at least one rubber having functionalized groups containing at least one Zerewitinoff active hydrogen and (2) at least one compound which contains at least two blocked isocyanate groups. The invention also discloses self-curing elastomers containing both blocked isocyanate groups. This invention also discloses self-curing elastomers containing both blocked isocyanate groups and groups containing at least one active Zerewitinoff hydrogen.

Il est parfois souhaitable de durcir les compositions de caoutchouc en utilisant des agents de vulcanisation non soufrés. Cette invention porte sur des compositions de caoutchouc qui peuvent être durcies sans soufre ou composés soufrés, et plus précisément sur une composition de caoutchouc qui peut être réticulée par chauffage et qui est composée 1) d'au moins un caoutchouc à groupes isocyanate bloqués pendants et 2) d'au moins un composé contenant deux hydrogènes actifs de Zerewitinoff. Cette invention porte aussi sur la réticulation d'élastomères contenant 1) au moins un caoutchouc à groupes fonctionnels comportant 1) au moins un hydrogène actif de Zerewitinoff et 2) au moins un composé contenant au moins deux groupes isocyanate bloqués; elle porte également sur des élastomères autopolymérisables contenant deux groupes isocyanates bloqués, ainsi que sur des élastomères autopolymérisables contenant deux groupes isocyanates bloqués et des groupes comportant au moins un hydrogène actif de Zerewitenoff.

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