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:
Jun. 22, 2021
Filed:
Dec. 13, 2016
Nippon Polytech Corp., Hachioji, JP;
NIPPON POLYTECH CORP., Tokyo, JP;
Abstract
Provided are a polyurethane and a curable composition capable of obtaining an overcoat film for a flexible wiring board that is excellent in low-warpage properties, flexibility, long-term insulation reliability, and wiring disconnection preventing properties. The polyurethane has: a structural unit of formula (1) (in formula (1), an n-number of Reach independently represents a 1,2-phenylene group or a 1,2-phenylene group having a substituent, an (n+1)-number of Reach independently represents a hydrocarbon group having 3-9 carbon atoms, and n represents an integer from 1 to 50); a structural unit of formula (2) (in formula (2). Rrepresents a divalent organic group having 6-14 carbon atoms); and a structural unit of formula (3) (in formula (3), Rrepresents a divalent organic group having 6-14 carbon atoms, and Rrepresents a methyl or ethyl group).