Production of aromatic polyamide

Details Production of aromatic polyamide Production of aromatic polyamide

1997-11-12

2000-10-10

Kumar, Shailendra

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

Synthetic resins

From carboxylic acid or derivative thereof

528335, 528347, 564138, 564139, 564153, C08G 6926

Patent

active

061303127

ABSTRACT:
A process for producing an aromatic polyamide which comprises:
(a) a dicarboxylic acid component which consists of 30-100 mol % of terephthalic acid and optionally 0-70 mol % of at least one dicarboxylic acid other than terephthalic acid, and
(b) a diamine component which consists of 50-100 mol % of an aliphatic alkylenediamine of 4-25 carbons and optionally 0-50 mol % of at least one alicyclic diamine of 3-25 carbons, said process comprising a first step of performing melt reaction of said dicarboxylic acid with said diamine, thereby giving a low molecular weight condensate having an intrinsic viscosity [.eta.] of 0.05-0.6 dl/g, a second step of subjecting it to solid phase polymerization, thereby giving an aromatic polyamide precursor having an intrinsic viscosity [.eta.] of 0.5-1.0 dl/g, and a third step of subjecting it to melt polymerization, thereby giving an aromatic polyamide having a desired intrinsic viscosity [.eta.] of 0.8-2.5 dl/g.
This process permits the industrial production of high molecular weight aromatic polyamides in an economical and efficient manner.

REFERENCES:
patent: 3454536 (1969-07-01), Schade et al.
patent: 4385170 (1983-05-01), Hirami et al.
patent: 4948868 (1990-08-01), Taguchi et al.
patent: 5109106 (1992-04-01), Lahary et al.
patent: 5128442 (1992-07-01), Pipper et al.

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