Process for in creasing polyamide molecular weight with P contai

Details Process for in creasing polyamide molecular weight with P contai Process for in creasing polyamide molecular weight with P contai

Filed on

1988-08-01

Date issued

1990-03-27

Examiner

Anderson, Harold D.

Patent Class

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

SubClass

Synthetic resins

SubSubClass

Mixing of two or more solid polymers; mixing of solid...

Other Related Categories

525419, C08G 6948

Type

Patent

Status

active

Patent number

049121758

Description

ABSTRACT:
In a process for increasing the molecular weight of a polyamide, e.g., nylon-6,6, comprising heating the polyamide in the presence of a catalyst to effect a desired molecular weight change, the improvement which comprises employing, as the catalyst,
(A) R.sup.1 (CH.sub.2).sub.n PO.sub.3 R.sub.2.sup.2 and R.sup.1 (CH.sub.2).sub.n PO.sub.2 HR.sup.2 where R.sup.1 is 2-pyridyl, NHR.sup.4 or NR.sub.2.sup.4 or NH.sub.2, n is an integer of from 2 to 5 inclusive, R.sup.2, being the same or different, is H or C.sub.x H.sub.2x+1, R.sup.4, being the same or different, is C.sub.x H.sub.2x+1, and x is an interger of from 1 to 10 inclusive; and
(B) R.sup.3 X(CH.sub.2).sub.n' PO.sub.3 R.sub.2.sup.2 and R.sup.3 X(CH.sub.2).sub.n' PO.sub.2 HR.sup.2 where X is S or O, n' is an integer of from 2 to 5 inclusive, R.sup.3 is H or C.sub.x H.sub.2x+1, x is an integer of from 0 to 10 inclusive and R.sup.2 is defined as in formula (A).

REFERENCES:
patent: 3365428 (1968-01-01), Wujciak
patent: 3509107 (1970-04-01), Brigmac
patent: 3763113 (1973-10-01), Burrows et al.
patent: 3825508 (1974-07-01), Ashida et al.
patent: 3944518 (1976-03-01), Burrows et al.
patent: 4390667 (1983-06-01), Aharoni et al.
patent: 4433116 (1984-02-01), Largman et al.

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