Branched copolymers based on unsaturated nitriles and...

Details Branched copolymers based on unsaturated nitriles and... Branched copolymers based on unsaturated nitriles and...

C - Chemistry, Metallurgy

08

F

C08F 236/12 (2006.01) C08C 19/02 (2006.01) C08F 2/38 (2006.01)

Patent

CA 2411680

The present invention relates to branched copolymers based on unsaturated nitriles and conjugated dienes which are characterized in that the content of bonded unsaturated nitrile is 15 to 50 wt.%, the Mooney viscosity ranges from 15 to 150 MU [ML 1+ 4/100°C], the chain branching ranges from 0 to 20° (determined by the .DELTA..delta.B value) and the solubility is >=85 wt.% (measured in methyl ethyl ketone at 20°C). The copolymers according to the invention can be used for the preparation of hydrogenated copolymers based on unsaturated nitriles and conjugated dienes (HNBRs) for the production of all kinds of mouldings by the injection moulding or extrusion process and for improving the flowability of elastomers.

L'invention concerne des copolymères ramifiés à base de nitriles insaturés et de diènes conjugués, qui se caractérisent en ce qu'il contiennent entre 15 et 50 % en poids de nitrile insaturé lié, en ce que la consistance Mooney se situe ente 15 et 150 M.E. [ML 1 + 4/100 ·C], en ce que la ramification de la chaîne est comprise entre 0 et 20· (valeur déterminée par la valeur .DELTA..delta.¿B?) et en ce que la solubilité est >= 85 % en poids, mesurée en méthyléthylcétone à 20 ·C. Ces copolymères s'utilisent pour préparer des copolymères hydrogénés à base de nitriles insaturés et de diènes conjugués (HNBR), pour produire des corps moulés de toutes sortes, obtenus par moulage par injection ou par extrusion et afin d'améliorer l'aptitude d'élastomères à être coulants.

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