Elastomer copolyether ester composition for flexible grease...

Details Elastomer copolyether ester composition for flexible grease... Elastomer copolyether ester composition for flexible grease...

C - Chemistry, Metallurgy

08

L

C08L 67/02 (2006.01)

Patent

CA 2257591

The invention relates to a copolyether ester composition for products that show particularly good aging behaviour when exposed to dynamic deformation at elevated temperatures and in contact with greases. The copolyether ester composition comprises a mixture of at least 2 copolyether ester A and B, composed of hard segments derived from at least one alkylene diol and at least one aromatic dicarboxylic acid and soft segments derived from at least one polyalkylene oxide glycol and at least one aromatic dicarboxylic acid, in which the concentration of soft segments X in A and the concentration of soft segments Y in B lie between 30 and 65 wt.%, relative to the copolyether ester and the molecular weights of X and Y lie between 500 and 3000 and | Mx-My | 400.

L'invention concerne une composition de copolyéthers esters destinée à des produits présentant un comportement de vieillissement particulièrement bon lorsqu'ils sont exposés à des déformations dynamiques à des températures élevées et au contact de graisses. La composition à base de copolyéther ester comprend un mélange d'au moins deux copolyéthers esters A et B, constitués de segments durs dérivés d'au moins un alkylène diol et d'au moins un acide dicarboxylique aromatique ainsi que de segments tendres dérivés d'au moins un glycol d'oxyde polyalkylénique ainsi qu'au moins un acide dicarboxylique aromatique, la concentration des segments tendres X dans A et la concentration des segments tendres Y dans B se situant entre 30 et 60 % en poids, par rapport au copolyéther ester et les masses moléculaires de X et Y se situent entre 500 et 3000 et | ¿x?-M¿y? | ? 400.

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