| 摘要 |
2141821 9429367 PCTABS00034 A process for the copolymerization of (1) a carboxylic acid comprising terephthalic acid and mixtures thereof with isophthalic acid with (2) a mixture of hexamethylene diamine and 2-methyl pentamethylene diamine. The pressure in the polymerization process is maintained at at least about 2.15 MPa for a period of at least about 40 minutes so that the resultant copolyamide, when annealed, has less than 1 % by weight based on the total weight of the copolyamide of fractions having melting points greater than 320 ·C. Use of lower pressures and times tends to result in formation of a high melting fraction.
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