Polyvinyl alcohol
US11111319B2 · kind B2 · utility
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Key dates
| Filing date | Mar 30, 2017 |
| Grant date | Sep 7, 2021 |
| Priority date | — |
| Expiry date | Mar 30, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F116/06
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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)
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.