Manufacture of terephthalic acid copolyamides

Details Manufacture of terephthalic acid copolyamides Manufacture of terephthalic acid copolyamides

C - Chemistry, Metallurgy

08

G

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

Patent

CA 2136177

A process for the copolymerization of (1) a carboxylic acid consisting of terephthalic acid and mixtures thereof with isophthalic acid with (2) a mixture of hexamethylene diamine and 2-methyl pentamethylene diamine. The combined amount of isophthalic acid and 2-methyl pentamethylene diamine is controlled 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. Preferably, the combined amount of isophthalic acid and 2-methyl pentamethylene diamine is greater than 27.5 %, molar basis, of the total amount of acid and diamine.

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