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:
Sep. 27, 2005
Filed:
Nov. 26, 2001
Masako Okanuma, Jyoetsu, JP;
Yuichi Ishida, Shinagawa-ku, JP;
Yoko Hase, Susono, JP;
Nobuhiro Higashida, Izumiohtsu, JP;
Takashi Enoki, Yokohama, JP;
Masako Okanuma, Jyoetsu, JP;
Yuichi Ishida, Shinagawa-ku, JP;
Yoko Hase, Susono, JP;
Nobuhiro Higashida, Izumiohtsu, JP;
Takashi Enoki, Yokohama, JP;
Sumitomo Bakelite Company, Ltd., Tokyo, JP;
Abstract
A novel aromatic carboxylic acid useful as a material for macromolecular compounds and, in particular, for polycondensed macromolecular compounds exhibiting excellent heat resistance, an acid halide derivative thereof and a process for producing these compounds are disclosed. The aromatic carboxylic acid and the acid halide derivative thereof have structures represented general formulae (1) and (2), respectively, and can be efficiently produced from a dialkyl ester derivative of isophthalic acid and an acetylene derivative in accordance with the disclosed process comprising specific steps.In the above formulae, A represents:—C≡C—R  (a)or(Rrepresents hydrogen atom, an alkyl group or an aromatic group, Rrepresents an alkyl group or an aromatic group) and X represents a halogen atom.