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:
Aug. 22, 2000
Filed:
Dec. 14, 1998
Applicant:
Inventors:
Assignee:
Tokyo Ohka Kogyo Co., Ltd., Kanagawa, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03C / ; C07C / ; C07C / ;
U.S. Cl.
CPC ...
4302701 ; 430192 ; 552292 ; 558 56 ; 558 58 ;
Abstract
A process for producing a polyphenol diester comprises esterifying a polyphenol compound and a naphthoquinone-1,2-diazidesulfonyl halide in the presence of for example monomethyldicyclohexylamine, and a positive photosensitive composition contains the resultant ester. According to this process, a diester of any polyphenol compound can be obtained with ease in a good yield, and a composition using the diester can achieve a high definition and a satisfactory exposure margin.