US 11,377,506 B2Granted

Vinyl alcohol-vinyl acetate copolymer

AssigneesTokushima University, Sekisui Chemical Co., Ltd.

InventorsKoichi Ute, Tomohiro Hirano, Miyuki Oshimura, Yasunari Kusaka, Yohei Nishimura, Misaki Senoo

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Abstract

The present invention provides a vinyl alcohol-vinyl acetate copolymer having excellent solubility and capable of providing a film having high flexibility, high mechanical strength, and high adhesion, and a method for producing a vinyl alcohol-vinyl acetate copolymer. Provided is a vinyl alcohol-vinyl acetate copolymer including a unit of vinyl alcohol and a unit of vinyl acetate, the vinyl alcohol-vinyl acetate copolymer having a triad unit chain ratio TOO of 7.5 or less, where the triad unit chain ratio TOO is obtained using the following formula (1): [ Math . ⁢ 1 ] T OO = [ Vac ⁢ ⁢ content ] × [ OOO ⁢ ⁢ proportion ] × 2 [ VOH ⁢ ⁢ content ] × [ AOO ⁢ ⁢ proportion ] ( 1 ) wherein the VOH content ratio represents the amount of the unit of vinyl alcohol, the Vac content ratio represents the amount of the unit of vinyl acetate, the OOO proportion represents the proportion of a triad OOO, and the AOO proportion represents the proportion of a triad AOO.

Claims8

Dependent claims

A vinyl alcohol-vinyl acetate copolymer comprising a unit of vinyl alcohol and a unit of vinyl acetate,

the vinyl alcohol-vinyl acetate copolymer having a triad unit chain ratio TOO of 0.5 or higher and 7.5 or less, where the triad unit chain ratio TOO is obtained using the following formula (1):
T
OO
=
[
Vac
⁢
⁢
content
]
×
[
OOO
⁢
⁢
proportion
]
×
2
[
VOH
⁢
⁢
content
]
×
[
AOO
⁢
⁢
proportion
]
(
1
)
wherein the VOH content ratio represents the amount of the unit of vinyl alcohol, the Vac content ratio represents the amount of the unit of vinyl acetate, the OOO proportion represents the proportion of a triad OOO, and the AOO proportion represents the proportion of a triad AOO, and
the vinyl alcohol-vinyl acetate copolymer having a triad unit chain ratio TAO of 0.5 or less, where the triad unit chain ratio TAO is obtained using the following formula (2):
T
AO
=
[
Vac
⁢
⁢
content
]
×
[
AOO
⁢
⁢
proportion
]
[
VOH
⁢
⁢
content
]
×
[
AOA
⁢
⁢
proportion
]
×
2
(
2
)
wherein the VOH content ratio represents the amount of the unit of vinyl alcohol, the Vac content ratio represents the amount of the unit of vinyl acetate, the AOO proportion represents the proportion of the triad AOO, and the AOA proportion represents the proportion of a triad AOA.

69 more elements

Dependencies are inferred from the claim text.