Molded nylon 4.6 article having first and second enthalpy

Details Molded nylon 4.6 article having first and second enthalpy Molded nylon 4.6 article having first and second enthalpy

1988-08-29

1990-07-31

Anderson, Harold D.

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

Synthetic resins

From carboxylic acid or derivative thereof

264 85, 264234, 264235, 26433119, 264345, 264346, 528481, 528483, C08G 6946

Patent

active

049451529

ABSTRACT:
The invention provides molded polyamide articles and a process for making the same. The molded polyamide articles consist substantially of tetramethylene adipamide units, the articles having an increased crystallinity expressed as a first melting enthalpy which is at least 30 Joules per gram higher than a second melting enthalpy determined after subsequent solidification of the polyamide. The process comprises shaping the polyamide from the melt, cooling the resulting polyamide article, and heat treating the article in an inert gas atmosphere at a temperature of 220.degree. C. for 0.25 to 24 hours.

REFERENCES:
patent: 4757131 (1988-07-01), Bongers et al.

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