Linear very high molecular weight polyamides and process for pro

Details Linear very high molecular weight polyamides and process for pro Linear very high molecular weight polyamides and process for pro

1996-05-31

1997-12-16

Mullis, Jeffrey C.

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

Synthetic resins

From carboxylic acid or derivative thereof

528313, 528322, 528335, 528336, 528337, 528487, 525419, 525420, C08G 6948

Patent

active

056986580

ABSTRACT:
A linear polyamide having a weight average molecular weight above 200,000 is made by heating a lower molecular weight molten polyamide with thorough mixing at a temperature of about 265.degree.-300.degree. C. for at least 5 minutes while an inert gas is swept gently through the reactor, the increase of molecular weight of the polyamide being catalyzed by a particular phosphinic acid derivative.

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patent: 3365428 (1968-01-01), Wujciak
patent: 3509107 (1970-04-01), Brignac
patent: 4390667 (1983-06-01), Aharoni et al.
patent: 4433116 (1984-02-01), Largman et al.
patent: 4912175 (1990-03-01), Wheland et al.
patent: 4966949 (1990-10-01), Wheland
Srinivasan et al., Solid-State Polymerization Vis-a-Vis Fiber Formation of Step-Growth Polymers. I. Results from a Study of Nylon 66, Journal of Applied Polymer Science, 53, 1731-1743, 1994, the month of publication is not available.

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