Process for preparing polyamideimide resins having high molecula

Details Process for preparing polyamideimide resins having high molecula Process for preparing polyamideimide resins having high molecula

1994-11-14

1996-07-02

Mullis, Jeffrey

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

Synthetic resins

From carboxylic acid or derivative thereof

528170, 528172, 528173, 528182, 528183, 528220, 528229, 528310, 528322, 528328, 528348, 528351, 528353, 525420, 525424, 525425, 525434, C08G 7314, C08G 6926

Patent

active

055323340

ABSTRACT:
A process for preparing polyamideimide resins having high molecular weights as described wherein major problems of prior art processes such as low heat resistance and low melt flowability are improved. Polyamideimide resins having an intrinsic viscosity of 0.4 to 1.50 dl/g as measured on a solution of dimethylacetamide as a solvent at a concentration of 0.5 g/dl at 30.degree. C., are prepared by reacting an aromatic tricarboxylic acid anhydride with an aromatic diamine in N-methyl pyrrolidone solvent in the presence of a first catalyst selected from a group consisting of thionyl chloride, p-toluenesulphonly chloride, sulfuryl chloride, cyanuric chloride and phosphorus trichloride at a temperature of 50.degree. C. to 130.degree. C. over a period of 1 to 5 hours and further reacting the resultant reaction mixture in the presence of a second catalyst which is a compound of the formula (RO).sub.3 P wherein R is an aliphatic or aromatic substituent, or a compound which is phosphoric acid, pyrophosphoric acid, phosphorous pentaoxide or phosphorous pentachloride as a second catalyst at a temperature of 50.degree. C. to 130.degree. C. over a period of 1 to 5 hours.

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