[en] 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, R<sup>1</sup>denotes an optionally substituted aromatic group having a carbon number from 6 to 20, and R<sup>2</sup>denotes 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
Research center :
Center for Education and Research on Macromolecules (CERM) CESAM - Complex and Entangled Systems from Atoms to Materials - ULiège
Takayama, Takumi; Kuraray Co. Ltd, Kurashiki-shi, Okayama, Japan
Maekawa, Kazuiko; Kuraray Co. Ltd, Kurashiki-shi, Okayama, Japan
Detrembleur, Christophe ; University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM) Research Unit, Center for Education and Research on Macromolecules (CERM), Belgium
Debuigne, Antoine ; University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM) Research Unit, Center for Education and Research on Macromolecules (CERM), Belgium
Jérôme, Christine ; University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM) Research Unit, Center for Education and Research on Macromolecules (CERM), Belgium
Language :
English
Title (54) :
Polyvinyl alcohol and method for producing polyvinyl alcohol
Publication date (43-45) :
20 May 2020
Filing date (22) :
11 July 2018
Patent/publication number (10-11) :
EP 3653652
Patent status (13) :
A
Priority number (30) :
JP 2017135804 A 20170711 ; JP 2017135805 A 20170711 ; JP 2018026233 W 20180711
International classification (IPC) (51) :
C08F 8/12; C08F 16/06
European classification (ECLA) (52) :
-
Applicant (71) :
University of Liège ( ULiège) Kuraray Co., Ltd.
Publication organism (19) :
EPO
Commentary :
This patent is published as CN 109071716A ; EP 3438139 A1 ; JPWO 2017170974 A1 ; US 10766978 B2 ; US 2019119414 A1 ; WO 2017170974 A1
