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. 21, 2009
Filed:
May. 15, 2006
Masatoshi Hasegawa, Chiba, JP;
Junichi Ishii, Tochigi, JP;
Masatoshi Hasegawa, Chiba, JP;
Junichi Ishii, Tochigi, JP;
Sony Corporation, Tokyo, JP;
Sony Chemical & Information Device Corporation, Tokyo, JP;
Abstract
Provided are an ester group-containing poly(imide-azomethine)copolymer having low linear thermal expansion coefficient; a production method thereof; an ester group-containing poly(amide acid-azomethine)copolymer to serve as the precursor of the poly(imide-azomethine)copolymer; a positive photosensitive composition including the poly(amide acid-azomethine)copolymer and a photosensitizer; a method for forming a fine pattern of an ester group-containing poly(imide-azomethine)copolymer from the composition; and a method for forming a fine pattern of an ester group-containing poly(imide-azomethine)copolymer by etching a photosensitizer-free, ester group-containing poly(imide-azomethine)copolymer in an alkaline solution. The ester group-containing poly(imide-azomethine)copolymer comprises an ester group-containing azomethine polymer unit of the formula (1) and an imide polymer unit of the formula (2): wherein in the formulas (1) and (2), A and D are each independently a divalent aromatic or aliphatic group with D containing an ester group; and B is a tetravalent aromatic or aliphatic group.