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:
Oct. 05, 1999
Filed:
Jul. 24, 1998
Takanori Murasaki, Aichi-ken, JP;
Takashi Komori, Aichi-ken, JP;
Toshiki Inoue, Aichi-ken, JP;
Yoshifumi Kato, Aichi-ken, JP;
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho, Kariya, JP;
Abstract
The present invention relates to a method for preparing a coloring layer composition for a chromatic device comprising a step of preparing a peroxotungstic acid solution comprising a solute including WO.sub.3 .circle-solid.aNb.sub.2 O.sub.5 .circle-solid.bH.sub.2 O.sub.2 .circle-solid.cH.sub.2 O (a, b, and c represent a positive number), water for dispersing and holding the solute, and an organic solvent compatible with water, and aging the peroxotungstic acid solution to obtain a polymer. According to the method of the present invention, a large size chromatic device can be reliably produced at a low cost. Further, a composition having a sufficient coloring effect and a quick response speed of the coloration-bleaching change in the chromatic device can be prepared.