Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1988-06-28
1989-12-05
Anderson, Harold D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528348, 528349, C08G 6932
Patent
active
048853569
ABSTRACT:
This invention relates to high molecular weight toluenediamine-containing polyamide resins formed by the reaction of a mixture of 2,4-toluenediamine and 2,6-toluenediamine and derivatives thereof with an aromatic diacid or precurser thereof. The resulting polyamides are amorphous, as opposed to crystalline. Because they are amorphous, they lend themselves to a wide variety of processing techniques and because of their high molecular weight, they have outstanding physical properties.
The polyamides are prepared using a precondensate method wherein a mixture of the toluenediamine isomers and aromatic acid, usually in the form of the aromatic acid dihalide, is reacted at relatively low temperatures forming a precondensate and the precondensate subsequently polymerized in the presence of an acid acceptor.
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patent: 3063966 (1962-11-01), Kwolek et al.
patent: 3094511 (1963-06-01), Hill, Jr. et al.
patent: 3640970 (1972-02-01), Ozawa et al.
patent: 4009154 (1977-02-01), Nona et al.
Libers Roland
Milligan Barton
Air Products and Chemicals Inc.
Anderson Harold D.
Brewer Russell L.
Marsh William F.
Simmons James C.
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