Foamed polyesters and methods for their production

Details Foamed polyesters and methods for their production Foamed polyesters and methods for their production

C - Chemistry, Metallurgy

08

J

C08J 3/22 (2006.01) C08J 9/00 (2006.01) C08K 5/092 (2006.01)

Patent

CA 2727639

Foam bodies made of thermoplastic polyesters with high homogeneity, a low open-cell factor and high elongation at break under shear stress, the polyester foam containing at least one thermoplastic elastomer such as a thermoplastic copolyester elastomer, in quantities of, for example, 0.5 to 15 % by weight based on the weight of the foam body. The foam bodies can be obtained by foaming a starting polyester with low intrinsic viscosity in a mixture with a modification means in the form of a premix containing dianhydrides of tetracarboxylic acids and thermoplastic copolyester elastomers.

L'invention concerne des corps expansés à base de polyesters thermoplastiques d'homogénéité élevée, d'ouverture cellulaire faible et d'allongement à la rupture sous une force de cisaillement élevé. Selon l'invention, la mousse de polyester contient au moins un élastomère thermoplastique, tel qu'un élastomère de copolyester thermoplastique, en quantités par exemple de 0,5 à 15 % en poids, par rapport au poids du corps expansé. Les corps expansés peuvent être obtenus par expansion d'un polyester de départ de viscosité intrinsèque faible en mélange avec un agent de modification sous la forme d'un prémélange contenant des dianhydrides d'acides tétracarboxyliques et des élastomères de copolyesters thermoplastiques.

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