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. 02, 1997
Filed:
Dec. 14, 1995
Applicant:
Inventors:
Carl-Lorenz Mertesdorf, Bad Krozingen, DE;
Bertold Nathal, Rodersdorf, CH;
Hans-Jorg Kirner, Pratteln, CH;
Assignee:
OCG Microelectronic Materials, Inc., Norwalk, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03C / ;
U.S. Cl.
CPC ...
430326 ; 430 18 ; 525242 ; 525298 ; 525534 ;
Abstract
A process for the preparation of phenolic resins having acid-labile acetal or ketal protecting groups by reacting a phenolic resin with an enol ether in the presence of an acidic catalyst and subsequently treating the reaction mixture with a basic anion exchanger gives heat-resistant polymers which, in combination with acid photogenerators, produce radiation-sensitive compositions of high processing stability with a greatly improved shelf life.