Producing fiber grade polyamide from terephthalic acid and 5-met

Details Producing fiber grade polyamide from terephthalic acid and 5-met Producing fiber grade polyamide from terephthalic acid and 5-met

1977-11-14

1979-10-23

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

526 71, 528324, 528331, 528338, 528339, 528340, 528345, 528349, C08G 6928

Patent

active

041721942

ABSTRACT:
Terephthalic acid and a diamine, always including 5-methyl-1,9-nonanediamine, and a lower fatty acid, e.g., acetic acid, are admixed with water, the water is evaporated, the concentrated mixture is heated (100.degree.-200.degree. C., 1/2-2 hrs.); then heated further (125.degree.-295.degree. C., 1/2-3 hrs., autogenous pressure up to 150-600 psig) with venting as needed; decompressed to atmospheric pressure (1/4-2 hrs., 245.degree.-295.degree. C.); and heated (270.degree.-295.degree. C., 1/2-2 hrs.) to produce a polyamide having good acid and basic dye receptivity, inherent viscosity, melt spinning and drawing characteristics. An isomeric mixture of diamines containing 5-methyl-1,9-nonanediamine, and 2,4-dimethyl-1,8-octanediamine, 2,4,6-trimethyl-1,7-heptanediamine and/or 4-isopropyl-1,7-heptanediamine can be the starting 5-methyl-1,9-nonanediamine-furnishing material. The diamine-furnishing material contains at least one principal diamine component having the formula H.sub.2 NRNH.sub.2, where R is selected from the group consisting of 5-methylnonamethylene, 2,4-dimethyloctamethylene, 2,4,6-trimethylheptamethylene, and 4-isopropylheptamethylene, the R in the formula of at least about 50 percent of the principal diamine component molecules initially present in the reaction being 5-methylnonamethylene. Other structural units, up to about 20 mole percent, can be present in the product which preferably will be at least 90 mole percent and up to about 98 mole percent and even up to about 100 mole percent derived from the foregoing recited terephthalic acid and diamines. Such other structural units are supplied by, e.g., other diamines, other dicarboxylic acids, amino acids and lactams.

REFERENCES:
patent: 4051087 (1977-09-01), Scoggins et al.
patent: 4060517 (1977-11-01), Mertes et al.

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