Vinyl alcohol copolymer, resin composition containing same, and resin molded body

Patent metadata

Field	Value
Publication number	US-2025059305-A1
Application number	US-202218720882-A
Country	US
Kind code	A1
Filing date	Dec 22, 2022
Priority date	Dec 27, 2021
Publication date	Feb 20, 2025
Grant date	—

Abstract

A vinyl alcohol copolymer may include a vinyl alcohol constituent unit and an olefin constituent unit vinyl alcohol having 3 to 30 carbon atoms. Such a copolymer may satisfy at least one of: a difference between a melting point and a lowest heat-sealing temperature is 45° C. or more; and the lowest heat-sealing temperature is 80° C. or less. Such a copolymer may satisfy predetermined relational formulas based on intensities and the number average molecular weight obtained from a UV absorption detector and a refractive index detector in gel permeation chromatography measurement performed on the copolymer.

First claim

1 . A vinyl alcohol copolymer, comprising:
a vinyl alcohol constituent unit; and an olefin constituent unit having 3 to 30 carbon atoms, wherein the vinyl alcohol copolymer satisfies at least one of: (i) a difference between a melting point and a lowest heat-sealing temperature is 45° C. or more; and (ii) a lowest heat-sealing temperature is 80° C. or less, and wherein the vinyl alcohol copolymer also satisfies a formula: (U1/R1)/(U2/R2)≤0.990 or 1.010≤(U1/R1)/(U2/R2) wherein U1 is a peak intensity value in a chromatogram obtained from a UV absorption detector at a molecular weight MU1 defined by a formula:

Log
10

⁢
MU
⁢
1

=

Log
10

⁢

(
Mn
)

+
0.5

,

_

when Mn is calculated from a chromatogram obtained from a refractive index detector in gel permeation chromatography measurement performed on a copolymer obtained by acetylating the vinyl alcohol copolymer,
R1 is a peak intensity value in the chromatogram obtained from the refractive index detector at a molecular weight MR 1 defined by a formula:

Log
10

⁢
MR
⁢
1

=

Log
10

⁢

(
Mn
)

+
0.5

,

_

when Mn is calculated from the chromatogram obtained from the refractive index detector in the gel permeation chromatography measurement performed on the copolymer obtained by the acetylating of the vinyl alcohol copolymer,
U2 is a peak intensity value in the chromatogram obtained from the UV absorption detector at a molecular weight MU2 defined by a formula:

Log
10

⁢
MU
⁢
2

=

Log
10

⁢

(
Mn
)

⁢

-

0.5

,

_

when Mn is calculated from the chromatogram obtained from the refractive index detector in the gel permeation chromatography measurement performed on the copolymer obtained by the acetylating of the vinyl alcohol copolymer,
R2 is a peak intensity value in the chromatogram obtained from the refractive index detector at a molecular weight MR2 defined by a formula:

Log
10

⁢
MR
⁢
2

=

Log
10

⁢

(
Mn
)

⁢

-

0.5

,

_

when Mn is calculated from the chromatogram obtained from the refractive index detector in the gel permeation chromatography measurement performed on the copolymer obtained by the acetylating of the vinyl alcohol copolymer, and
Mn is a number average molecular weight of the copolymer obtained by the acetylating of the vinyl alcohol copolymer, calculated from the chromatogram obtained from the refractive index detector.

2 . The vinyl alcohol copolymer of claim 1 , wherein the olefin constituent unit has 3 to 9 carbon atoms.

3 . The vinyl alcohol copolymer of claim 2 ,
wherein the olefin constituent unit comprises a propylene unit, a 1-butene unit, a cis-2-butene unit, a trans-2-butene unit, a 2-methylpropylene unit, a 1-pentene unit, a cis-2-pentene unit, a trans-2-pentene unit, a 2-methyl-1-butene unit, a 2-methyl-2-butene unit, a 3-methyl-1-butene unit, a 1-hexene unit, a 1-heptene unit, a 1-octene unit, a 1-nonene unit, a 2-methyl-1-octene unit, and/or a 7-methyl-1-octene unit.

4 . The vinyl alcohol copolymer of claim 3 , wherein the olefin constituent unit comprises a propylene unit, a 1-butene unit, a cis-2-butene unit, a trans-2-butene unit, and/or a 2-methylpropylene unit.

5 . The vinyl alcohol copolymer of claim 4 , wherein the olefin constituent unit is a propylene unit.

6 . The vinyl alcohol copolymer of claim 4 , wherein the olefin constituent unit is a 2-methylpropylene unit.

7 . The vinyl alcohol copolymer of claim 1 comprising the olefin constituent unit in a range of from 0.1_to 60 mol %.

8 . The vinyl alcohol copolymer of claim 1 , wherein the number average molecular weight (Mn) of the copolymer obtained by the acetylating of the vinyl alcohol copolymer is in a range of from 400 to 200000.

9 . The vinyl alcohol copolymer of claim 1 , wherein the vinyl alcohol polymer has a degree of saponification in a range of from 50 to 100 mol %.

10 . The vinyl alcohol copolymer of claim 1 comprising the vinyl alcohol constituent unit in a range of from 75 to 99 mol %.

11 . The vinyl alcohol copolymer of claim 1 , further comprising:
a constituent unit comprising a hydroxyl group, other than the vinyl alcohol constit

Assignees

• Kuraray Co

Inventors

• Baba Masahiro
• Akutagawa Shinnosuke
• Ueyama Shingo
• Konishi Hiroyuki

Classifications

• C08F8/12 Primary

  Hydrolysis · CPC title

• C08F218/08

  Vinyl acetate · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08L29/04

  Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids · CPC title