| 摘要 |
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.degree.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.
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