The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 1996
Filed:
Nov. 14, 1994
Kil-Yeong Choi, Daejeon, KR;
Dong-Hack Suh, Daejeon, KR;
Mi-Hie Yi, Daejeon, KR;
Young-Taik Hong, Daejeon, KR;
Jong-Chan Won, Daejeon, KR;
Korea Research Institute of Chemical Technology, Daejeon, KR;
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.