Halogenated elastomeric compositions having enhanced viscosity

Details Halogenated elastomeric compositions having enhanced viscosity Halogenated elastomeric compositions having enhanced viscosity

C - Chemistry, Metallurgy

08

L

C08L 23/28 (2006.01) C08F 8/00 (2006.01) C08F 8/32 (2006.01) C08K 5/1545 (2006.01) C08K 5/17 (2006.01) C08L 21/00 (2006.01) C08L 23/10 (2006.01) C08L 77/00 (2006.01) C08L 101/00 (2006.01)

Patent

CA 2425455

The invention provides a method for increasing the viscosity of C4-C7 isoolefin copolymers including halomethylstyrene derived units by mixing the copolymer with a hindered amine or phosphine of the structure R1R2R3 N or R1R2R3P wherein R1R2 and R3 are preferably lower and higher alkyl groups. The resulting ionically associated, amino or phosphine modified elastomers are used to prepare thermoplastic elastomer blend compositions, including dynamically vulcanized compositions, containing more finely dispersed elastomers which results in compositions having improved mechanical properties.

L'invention concerne un procédé d'augmentation de la viscosité de copolymères d'isooléfine C¿4?-C¿7? contenant des unités d'halométhylstyrène. Ce procédé consiste à à mélanger le copolymère avec une phosphine ou une amine encombrée répondant à la structure R¿1?R¿2?R¿3? N ou R¿1?R¿2?R¿3 ?P, où R¿1?R¿2? et R3 sont de préférence des groupes alkyle inférieurs et supérieurs. Les élastomères à amine ou phosphorine modifiée ioniquement associés obtenus sont utilisés dans la préparation de compositions de mélange d'élastomère thermoplastique, notamment des compositions vulcanisées de façon dynamique, contenant des élastomères plus finement dispersés et permettant d'obtenir des compositions présentant des propriétés mécaniques améliorées.

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