Multistage process for the preparation of poly(tetramethylene-ad

Details Multistage process for the preparation of poly(tetramethylene-ad Multistage process for the preparation of poly(tetramethylene-ad

1986-07-16

1988-01-12

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

528336, 528338, 528339, 528340, C08G 6928

Patent

active

047192844

ABSTRACT:
Process for the preparation of polyamides from 1,4-diaminobutane and adipic acid, wherein a 40 to 70% strength aqueous solution of the monomers is heated at 280.degree.-320.degree. C., preferably 290.degree.-310.degree. C., for a period of 5 to 30 minutes under a pressure of less than 8 bar, to give a precondensate having a relative viscosity of 1.05 to 2.0, and solid phase after-condensation at 180.degree.-260.degree. C.

REFERENCES:
patent: 4408036 (1983-10-01), Gaymans et al.
patent: 4446304 (1984-05-01), Gaymans et al.
patent: 4460762 (1984-07-01), Gaymans et al.

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