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:
Apr. 05, 1994
Filed:
Nov. 28, 1990
Applicant:
Inventors:
Dinesh N Khanna, Kent, RI (US);
Robert E Potvin, Kent, RI (US);
Assignee:
Hoechst Celanese Corporation, Somerville, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03F / ;
U.S. Cl.
CPC ...
430169 ; 430193 ;
Abstract
A method of preparing a photosensitizer condensate comprising: condensing a phenolic compound with a diazo sulfonyl chloride, wherein from about 50 to 100 mole percent of the diazo moiety is 2,1,4-diazo and from 0 to about 50 mole percent of the diazo moiety is 2,1,5 diazo; the phenolic compound having, on average, from about 60 mole percent to about 100 mole percent of its hydroxy groups esterified by the diazo sulfonyl chloride; wherein the condensing is conducted in a lactone solvent in the presence of an acid scavenger; and then subsequently isolating the photosensitizer condensate.