Random copolymerized polyamide resin and process for preparing t

Details Random copolymerized polyamide resin and process for preparing t Random copolymerized polyamide resin and process for preparing t

1996-09-13

1998-03-03

Hampton-Hightower, P.

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

Synthetic resins

From carboxylic acid or derivative thereof

528311, 528312, 528313, 528315, 528318, 528323, 528335, 528340, 528347, C08G 6936

Patent

active

057235694

ABSTRACT:
A random copolymerized polyamide resin is prepared by reacting a lactam of the formula (I): ##STR1## wherein R.sup.1 is a C.sub.2-11 alkylene group optionally substituted with a substituent having 1 to 6 carbon atoms, with a hexamethylenediamine-adipic acid salt while concentrating the aqueous solution of the salt to a concentration of at least 70% by weight and while maintaining a uniform reaction phase at all times by controlling the pressure over and the temperature of the reaction medium such that the hexamethylenediamine-adipic acid salt does not precipitate, said pressure being up to not greater than 2 kg/cm.sup.2 .multidot.G and said temperature being up to not greater than 150.degree. C., and then mixing in the solution of the lactam of formula (I) thereby effecting copolymerization and forming a polyamide resin having a relative viscosity measured by the sulfuric acid solution method (1% at 25.degree. C.) of 1.5 to 8.0.

REFERENCES:
patent: 3583947 (1971-06-01), Schmidt et al.
patent: 3879354 (1975-04-01), Bonner
patent: 4596865 (1986-06-01), Gabbert et al.

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