Kuraray Co., Ltd.

Universitéde Liége

Centre Hospitalier Universitaire De Liège

Christine Jerome

Kazuhiko Maekawa

Yusuke Amano

Samuel Voccia

Christophe Detrembleur

Takumi Takayama

Cécile Oury

Patrizio Lancellotti

Antoine Debuigne

Alain Colige

Harry Serwas

Robert Jerome

Astrid Freichels

Jean-Michel Thomassin

Florent Monie

Victor Tchemtchoua Tateu

Abdelhafid Aqil

Sofia Melo

Anna Pierrard

Bruno Grignard

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&#xb7;Mn/44&#x2265;0.5&#x2003;&#x2003;(1)

Polyvinyl alcohol and method for producing polyvinyl alcohol

A polyvinyl alcohol is produced in a method comprising: a polymerization step comprising polymerizing vinyl ester monomers by controlled radical polymerization in the presence of a radical initiator and an organic cobalt complex to obtain a polymer solution containing a polyvinyl ester; an extraction step comprising extracting a cobalt complex from the polymer solution by contacting an aqueous solution containing a water-soluble ligand with the polymer solution; and a saponification step comprising saponifying the polyvinyl ester after the extraction step to obtain a polyvinyl alcohol. A method for producing a polyvinyl alcohol is thus provided that has a narrow molecular weight distribution and a high number-average molecular weight with good hue and further good solubility in water.

Polyvinyl alcohol and method for producing same

Growing community of inventors

Liege, Belgium

Christine Jerome