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:
Jul. 25, 2006
Filed:
Oct. 10, 2003
Atsushi Terahara, Hioki-gun, JP;
Daizaburo Yashiki, Tsukuba, JP;
Atsushi Terahara, Hioki-gun, JP;
Daizaburo Yashiki, Tsukuba, JP;
Sumitomo Chemical Company, Limited, Osaka, JP;
Abstract
The present invention provides a block copolymer comprising at least one segment having an acid group and at least one segment substantially free from an acid group, wherein the segment having an acid group comprises a repeating unit which is a substituted repeating unit represented in the formula (1) with an acid group,—(Ar—X—Ar—X)—,   (1)and in the formula(1), Xand Xbeing each independently —O— or —S—, Arand Arbeing each independently an aromatic group selected from the groups represented by the following formulae (2) to (4)