Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From carboxylic acid or derivative thereof
Patent
1985-09-26
1988-01-05
Ivy, C. Warren
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From carboxylic acid or derivative thereof
528340, 528342, 528348, C08G 7318
Patent
active
047177640
ABSTRACT:
A two stage process for the production of benzimidazole/aromatic amide polymers and copolymers and wholly aromatic polyamides is provided wherein an aromatic amine component comprising an aromatic diamine or triamine and optionally, an aromatic tetraamine is reacted with an aromatic dicarboxylic acid and/or ester. The reactants are heated with agitation in a first stage to a temperature at least sufficient to initiate condensate evolution. The agitation is then discontinued and the reaction is allowed to proceed, in many cases with the formation of a foam while heating is continued. The reaction mass is then allowed to solidify by cooling and is crushed to a ground prepolymer which is heated with agitation in a second stage to a temperature higher than that of the first stage until the desired polymer is obtained. The invention also includes certain benzimidazole/aromatic amide polymers and copolymers as new compositions of matter.
REFERENCES:
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patent: 3839296 (1974-10-01), Campbell
patent: 3901854 (1975-08-01), Jones
patent: 4348513 (1982-09-01), Keske
patent: 4385170 (1983-05-01), Hirami
patent: 4588808 (1986-05-01), Ward
patent: 4672104 (1987-06-01), Ward
Celanese Corporation
Ivy C. Warren
Stine Forrest D.
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