# US 11,028,200 B2 · Side-chain-olefin-containing vinyl alcohol polymer and method of producing same

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- Number: US 11,028,200 B2
- Document ID: US11028200B2
- Status: Granted
- Kind: B2
- Application number: 16/474,148
- Filed: 2017-12-26
- Published: 2019-11-14
- Granted: 2021-06-08
- Earliest claimed: 2016-12-28
- Assignees: Kuraray Co., Ltd.
- Applicants: Kuraray Co., Ltd.
- Inventors: Yusuke Amano; Yuki Tachibana; Yuki Kosaka; Kazuhiko Maekawa
- Web page: https://patentgrep.com/patent/US11028200B2

## CPC

- C08F 216/06: Polyvinyl alcohol {; Vinyl alcohol}
- C08F 8/14: Esterification
- C08F 261/04: on to polymers of vinyl alcohol
- C08F 299/00: Macromolecular compounds obtained by interreacting polymers involving only carbon-to-carbon unsaturated bond reactions, in the absence of non-macromolecular monomers
- C08F 2800/10: as molar percentages
- C08F 2810/30: leading to the formation or introduction of aliphatic or alicyclic unsaturated groups
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- Y02P 20/582: Recycling of unreacted starting or intermediate materials
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention relates to a vinyl alcohol-based polymer having an olefin in side chain, comprising a vinyl alcohol unit and a structural unit represented by Formula (I), wherein X represents a divalent saturated hydrocarbon group with 1 to 6 carbon atoms, optionally having a branched structure; Y represents a hydrogen atom or a saturated hydrocarbon group with 1 to 6 carbon atoms, optionally having a branched structure; and Z represents a hydrogen atom or a methyl group. Thus, there is provided a vinyl alcohol-based polymer having an olefin in side chain exhibiting higher water solubility even after thermal treatment, higher storage stability, and higher reactivity to high energy beam, and a method for producing it.

## Claims

### Claim 1

A vinyl alcohol-based polymer comprising an olefin in a side chain, the vinyl alcohol-based polymer comprising:
a vinyl alcohol unit and
a structural unit represented by the following formula (I):
wherein X represents at least one alkylene group selected from the group consisting of a methylene group, an ethylene group, a propylene group and a butylene group, having an alkyl group as a branched structure; Y represents a hydrogen atom; and Z represents a hydrogen atom.

### Claim 2 (depends on 1)

The vinyl alcohol-based polymer of claim 1, wherein the total carbon number of X is 9 or less.

### Claim 3 (depends on 1)

The vinyl alcohol-based polymer of claim 1, wherein a content of the structural unit represented by the formula (I) based on the total monomer units in the vinyl alcohol-based polymer is from 0.05 to 10 mol %.

### Claim 4 (depends on 1)

A powder or pellets made of the vinyl alcohol-based polymer of claim 1, wherein the vinyl alcohol-based polymer has a volume average particle size of from 20 to 1000 μm and 2 g or more of the vinyl alcohol-based polymer can be completely dissolved in 100 g of water at 25° C.

### Claim 5 (depends on 1)

A method for producing the vinyl alcohol-based polymer of claim 1, the method comprising:
transesterifying a vinyl alcohol-based polymer with an ester compound of the following formula (II):
wherein X represents at least one alkylene group selected from the group consisting of a methylene group, an ethylene group, a propylene group and a butylene group, having an alkyl group as a branched structure; Y represents a hydrogen atom; and Z represents a hydrogen atom, and R represents a saturated hydrocarbon group having from 1 to 5 carbon atoms.

### Claim 6 (depends on 1)

The vinyl alcohol-based polymer of claim 1, comprising a structural unit represented by the following formula: