High pressure process for the manufacture of terephthalic acid c

Details High pressure process for the manufacture of terephthalic acid c High pressure process for the manufacture of terephthalic acid c

1994-06-08

1997-08-12

Seidleck, James J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528335, 528338, 528339, 528340, 528347, C08G 6928

Patent

active

056567170

ABSTRACT:
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.degree. C. Use of lower pressures and times tends to result in formation of a high melting fraction.

REFERENCES:
patent: 4163101 (1979-07-01), Schade et al.
patent: 4219636 (1980-08-01), Nielinger et al.
patent: 5109106 (1992-04-01), Lahary et al.
patent: 5194578 (1993-03-01), Anton
patent: 5270437 (1993-12-01), Marks
patent: 5302691 (1994-04-01), Soelch

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