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:
Jan. 05, 1993
Filed:
Sep. 10, 1990
Asahi Kasei Kogyo Kabushiki Kaisha, Osaka, JP;
Abstract
A sulfonic acid group-containing polyurethane produced from a sulfonic acid group-containing polyamide diol and/or a sulfonic acid group containing polyester diol, a dihydroxyhydrocarbon having a specific molecular weight and a diisocyanate. This polyurethane has not only high hydrophilicity but also excellent mechanical strength, excellent heat resistance, low permanent tensile set and low hardness, which are required for the base polymer for a photosensitive resin composition to be used for producing a flexographic printing plate. Further, a photosensitive resin composition containing such a sulfonic acid group-containing polyurethane has excellent photosensitivity and in addition, has excellent properties such that after the photosensitive resin composition has been exposed to actinic rays through an image-bearing transparency, the development of the exposed composition can be performed with water or an aqueous alkali solution. From this photosensitive resin composition, a flexographic printing plate having excellent printing resistance, ink resistance and mechanical properties can be obtained.