High melting point crystalline polyamides

Details High melting point crystalline polyamides High melting point crystalline polyamides

C - Chemistry, Metallurgy

08

G

C08G 69/26 (2006.01) C08G 69/28 (2006.01)

Patent

CA 2098271

Copolyamides having high crystallinity over the whole composition range, a melting enthalpy .DELTA.H > 3.5 cal/g and a melting point T M higher than 270°C and articles manufactured therefrom are disclosed, said copolyamides comprising, by moles: a) 1 to 99% of a unit A of formula -(NH-R-NHCO-AR1-CO)- in which R is a -(CH2)n- carbon chain where n is comprised between 4 and 20, and AR1 is the residue from the condensation of terephthalic acid and/or of the diester form thereof; and b) 99 to 1% of a unit B of formula -(NH-R-NHCO-AR2-CO)- in which R is the same carbon chain as in unit A and AR2 is the residue from condensation of naphthalene-2,6-dicarboxylic acid and/or the diester form thereof.

n divulgue des copolyamides ayant une forte cristallinité sur toute la plage des compositions, une enthalpie de fusion DELTA H supérieure à 3.5 cal/g et un point de fusion T M supérieur à 270 degrés C, ainsi que des articles fabriqués avec ceux-ci. Ces copolyamides comportent, en moles: a) de 1 à 99% d'une unité A de formule -(NH-R-NHCO-AR1-CO)-, dans laquelle R est une chaîne carbonée -(CH2)n- où n est compris entre 4 et 20 et AR1 est le résidu de la condensation de l'acide téréphthalique et (ou) de son diester et b) de 99 à 1% d'une unité B de formula -(NH-R-NHCO-AR2-CO)-, dans laquelle R est la même chaîne carbonée que dans l'unité A et AR2 est le résidu de condensation de l'acide naphthalène-2,6-dicarboxylique et (ou) de son diester.

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