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:
Mar. 01, 2022
Filed:
Jul. 11, 2018
Kuraray Co., Ltd., Kurashiki, JP;
Universite DE Liege, Liege, BE;
Takumi Takayama, Kurashiki, JP;
Kazuhiko Maekawa, Kurashiki, JP;
Christophe Detrembleur, Liege, BE;
Antoine Debuigne, Liege, BE;
Christine Jerome, Liege, BE;
KURARAY CO., LTD., Kurashiki, JP;
UNIVERSITE DE LIEGE, Liege, BE;
Abstract
A polyvinyl alcohol has a number-average molecular weight (Mn) from 4,400 to 440,000, a molecular weight distribution (Mw/Mn) from 1.05 to 1.70, a degree of saponification from 80 to 99.99 mol %, wherein the polyvinyl alcohol contains an end group represented by a formula (I) below, and a molar ratio (X) of the end group based on total monomer units and the number-average molecular weight (Mn) satisfy a formula (1) below. Such a polyvinyl alcohol has a narrow molecular weight distribution and a high number-average molecular weight with hue good. (In the formula, Rdenotes an optionally substituted aromatic group having a carbon number from 6 to 20, and Rdenotes a hydrogen atom, an alkyl group having a carbon number from 1 to 20, or an optionally substituted aromatic group having a carbon number from 6 to 20.)X·Mn/44≥0.5  (1)