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:
Jun. 21, 2005
Filed:
Jun. 30, 2004
Tatsuhiko Osaki, Gamagori, JP;
Tetsuo Ichihashi, Sagamihara, JP;
Tatsuhiko Osaki, Gamagori, JP;
Tetsuo Ichihashi, Sagamihara, JP;
Takemoto Yushi Kabushiki Kaisha, Aichi, JP;
Teijin DuPont Films Japan Limited, Tokyo, JP;
Abstract
An ultraviolet radiation absorbent is produced by a method including specified Step A, Step B and Step C. Step A is a process of causing an amidation of anthranilic acid and terephthaloyl dichloride in the presence of a solvent and an alkali to generate N,N'-bis(o-carboxyphenylterephthalamid) and separating a solid component containing N,N′-bis(o-carboxyphenylterephthalamid) generated by this amidation. Step B is a process of separating a solid component containing cyclic imino ester compound of a specified kind. Step C is a process of processing the solid component separated in Step B with an alkaline solution and further washing with water to obtain the ultraviolet radiation absorbent for thermoplastic polymers containing cyclic imino ester compound of the specified kind.