Polyvinyl alcohol
AssigneeKuraray Co., Ltd.
InventorsYusuke Amano, Takumi Takayama, Kazuhiko Maekawa
Life of this patent
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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 %, and a carbon-carbon double bond content (X) of 0.1 mol % or less based on total monomer units, and satisfying a formula (1) below. A polyvinyl alcohol, having a narrow molecular weight distribution and a high number-average molecular weight with good hue, and a method for producing the same are thus provided. X·Mn≤1000 (1)
Claims6
A polyvinyl alcohol consisting of vinyl alcohol units and vinyl ester units;
- wherein
- a number-average molecular weight (Mn) of the polyvinyl alcohol is from 4,400 to 220,000,
- a molecular weight distribution (Mw/Mn) of the polyvinyl alcohol is from 1.05 to 1.70,
- a content of vinyl alcohol units of the polyvinyl alcohol is from 80 to 99.99 mol %, and
- a carbon-carbon double bond content (X) of the polyvinyl alcohol is 0.1 mol % or less based on total monomer units, and satisfying a formula;
- X·Mn≤1000 (1).
A polyvinyl alcohol consisting of vinyl alcohol units and vinyl ester units;
- wherein
- a number-average molecular weight (Mn) of the polyvinyl alcohol is from 11.000 to 190,000, a molecular weight distribution (Mw/Mn) from 1.05 to 1.60, a degree of saponification from 80 to 99.99 mol %, and a yellow index (Y1) measured in accordance with ASTM D1925 of 50 or less.
Dependencies are inferred from the claim text.