| 摘要 |
<p>Copolyamides intended to be used in the manufacture of objects, having, throughout the composition range, a high crystallinity with DELTA H > 3.5 cal/g and having a high melting point M.p. > 270 DEG C, characterised in that they consist, in mols, of: a) 1 to 99% of a unit A of formula: -(NH-R-NHCO-AR1-CO)- in which: R represents a carbon chain -(CH2)n- where n is between 4 and 20; AR1 represents the residue resulting from the condensation of terephthalic acid and/or of its diester form; and b) 99 to 1% of a unit B of formula: -(NH-R-NHCO-AR2-CO)- in which: R represents the same carbon chain as in the unit A; AR2 represents the residue resulting from the condensation of naphthalene-2,6-dicarboxylic acid and/or of its diester form. <IMAGE></p> |
