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US 12,698,355 B2Granted
Vinyl alcohol polymer, method for producing vinyl alcohol polymer, dispersant for suspension polymerization, dispersion aid for suspension polymerization, and method for producing vinyl polymer
AssigneeKuraray Co., Ltd.
InventorsMisuzu Fukuyama, Masaki Kato
Life of this patent
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Abstract
A vinyl alcohol polymer including, in the same molecule or in different molecules, a carbonyl group, a formyl group, and an alkenyl group. A method for producing a vinyl alcohol polymer, including polymerizing a vinyl ester in a presence of an unsaturated aliphatic aldehyde to obtain a vinyl ester polymer, and saponifying the vinyl ester polymer.
Claims20
A vinyl alcohol polymer, comprising, in the same molecule or in different molecules:
- a carbonyl group, in which two atomic bonds both bond to a carbon atom;
- a formyl group;
- and
- a vinyl group of formula (5) comprising an alkenyl group at a first end of a polymer chain:
- wherein, in the formula (5), n is an integer in a range of from 1 to 11,
- wherein the vinyl alcohol polymer is one molecule or a mixture of multiple different vinyl alcohol polymers.
3 more elements
A vinyl alcohol polymer, comprising, at a second end of a polymer chain, a carbonyl side group of formula (2):
- wherein, in the formula (2), R1 is an alkenyl group comprising a methylene group at an end of the carbonyl side group.
Dependencies are inferred from the claim text.