Polyvinyl alcohol resin film, method for discriminating polyvinyl alcohol resin film, and method for manufacturing polyvinyl alcohol resin film

Patent metadata

Field	Value
Publication number	US-12054606-B2
Application number	US-202217868862-A
Country	US
Kind code	B2
Filing date	Jul 20, 2022
Priority date	Oct 15, 2020
Publication date	Aug 6, 2024
Grant date	Aug 6, 2024

Abstract

A method for discriminating a polyvinyl alcohol resin film containing a polyvinyl alcohol resin in which all or a part of carbon is derived from bio-derived ethylene from a polyvinyl alcohol resin film containing only a polyvinyl alcohol resin derived only from fossil fuel-derived ethylene by measuring an abundance ratio 14 C/C of carbon 14 ( 14 C) in total carbon.

First claim

The invention claimed is:

1. A method for discriminating a polyvinyl alcohol resin film, the method comprising:
producing a polyvinyl alcohol resin film containing a polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb);
cutting the polyvinyl alcohol resin film;
removing components other than the polyvinyl alcohol resin (Ab) from the polyvinyl alcohol resin film to obtain a purified polyvinyl alcohol resin (Ab);
cutting a sample polyvinyl alcohol resin film comprising a sample polyvinyl alcohol resin;
removing components other than the sample polyvinyl alcohol resin from the sample polyvinyl alcohol resin film to obtain a purified sample polyvinyl alcohol resin;
measuring an abundance ratio 14 C/C of carbon 14 ( 14 C) in total carbon in the purified polyvinyl alcohol resin (Ab) and in the purified sample polyvinyl alcohol resin; and
determining whether the sample polyvinyl alcohol resin is a polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb) or a polyvinyl alcohol resin (Ap) derived only from fossil fuel-derived ethylene (Bp) based on the measured abundance ratio 14 C/C.

2. The method according to claim 1 , further comprising:
measuring a carbon stable isotope ratio δ 13 C of carbon 13 ( 13 C) in the purified polyvinyl alcohol resin (Ab); and
determining whether the bio-derived ethylene (Bb) in the polyvinyl alcohol resin (Ab) is derived from C3 plant or C4 plant based on the measured carbon stable isotope ratio δ 13 C.

3. The method according to claim 2 , wherein
when the measured carbon stable isotope ratio δ 13 C is −20%% or more, the bio-derived ethylene (Bb) in the polyvinyl alcohol resin (Ab) is determined as being derived from C4 plant, and
when the measured carbon stable isotope ratio δ 13 C is less than −20%%, the bio-derived ethylene (Bb) in the polyvinyl alcohol resin (Ab) is determined as being derived from C3 plant.

4. The method according to claim 1 , wherein when the measured abundance ratio 14 C/C in the purified sample polyvinyl alcohol resin is identical to the measured abundance ratio 14 C/C in the purified polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb), the sample polyvinyl alcohol resin is determined as a polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb).

5. The method according to claim 1 , wherein when the measured abundance ratio 14 C/C in the purified sample polyvinyl alcohol resin is substantially 0%, the sample polyvinyl alcohol resin is determined as the polyvinyl alcohol resin containing only a polyvinyl alcohol resin (Ap) derived only from fossil fuel-derived ethylene (Bp).

6. The method according to claim 1 , wherein the producing of the polyvinyl alcohol resin film comprises:
synthesizing a vinyl ester monomer by reacting a compound having a carboxy group with the bio-derived ethylene (Bb), or synthesizing a vinyl ester monomer by reacting a compound having a carboxy group containing 14 C with ethylene;
polymerizing the obtained vinyl ester monomer to obtain a polyvinyl ester;
saponifying the obtained polyvinyl ester to obtain the polyvinyl alcohol resin (Ab); and
producing the polyvinyl alcohol resin film using the obtained polyvinyl alcohol resin (Ab).

7. A method for discriminating a polyvinyl alcohol resin film, the method comprising:
producing a polyvinyl alcohol resin film containing a polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb);
cutting the polyvinyl alcohol resin film;
removing components other than the polyvinyl alcohol resin (Ab) from the polyvinyl alcohol resin film to obtain a purified polyvinyl alcohol resin (Ab);
cutting a sample polyvinyl alcohol resin film comprising a sample polyvinyl alcohol resin;
removing components other than the sample polyvinyl alcohol resin from the sample polyvinyl alcohol resin film to obtain a purified sample polyvinyl alcohol resin;
measuring an abundance ratio 14 C/C of carbon 14 ( 14 C) in total carbon in the purified polyvinyl alcohol resin (Ab) and in the purified sample polyvinyl alcohol resin; and
determining whether the sample polyvinyl alcohol resin is a first polyvinyl alcohol resin (Ab) in which all or a part of the carbon is derived from bio-derived ethylene or a second polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb), an amount of carbon derived from bio-derived ethylene (Bb) in the first polyvinyl alcohol resin (Ab) being different from an amount of carbon derived from bio-derived ethylene (Bb) in the second polyvinyl alcohol resin, based on the measured abundance ratio 14 C/C.

8. The method according to claim 7 , further comprising:
measuring a carbon stable isotope ratio δ 13 C of carbon 13 ( 13 C) in the purified polyvinyl alcohol resin and/or the purified sample polyvinyl alcohol resin; and
determining whether the bio-derived ethylene (Bb) in the polyvinyl alcohol resin (Ab) and/or the sample polyvinyl alcohol resin is derived from C3 plant or C4 plant based on the measured carbon stable isotope ratio δ 13 C.

9. The method according to claim 8 , wherein
when the measured carbon stable isotope ratio δ 13 C is −20%% or more, the bio-derived ethylene (Bb) in the polyvinyl alcohol resin (Ab) and/or the sample polyvinyl alcohol resin is determined as being derived from C4 plant, and
when the measured carbon stable isotope ratio δ 13 C is less than −20%%, the bio-derived ethylene (Bb) in the polyvinyl alcohol resin (Ab) and/or the sample polyvinyl alcohol resin is determined as being derived from C3 plant.

10. The method according to claim 7 , wherein
when the measured abundance ratio 14 C/C in the purified sample polyvinyl alcohol resin is identical to the measured abundance ratio 14 C/C in the purified polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb), the sample polyvinyl alcohol resin is determined as the first polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb), and
when the measured abundance ratio 14 C/C in the purified sample polyvinyl alcohol resin is different from the measured abundance ratio 14 C/C in the purified polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb), the sample polyvinyl alcohol resin film is determined as the second polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb).

11. A method for discriminating a polyvinyl alcohol resin film, the method comprising:
producing a polyvinyl alcohol resin film containing a polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb);
cutting the polyvinyl alcohol resin film;
removing components other than the polyvinyl alcohol resin (Ab) from the polyvinyl alcohol resin film to obtain a purified polyvinyl alcohol resin (Ab);
cutting a sample polyvinyl alcohol resin film comprising a sample polyvinyl alcohol resin;
removing components other than the sample polyvinyl alcohol resin from the sample polyvinyl alcohol resin film to obtain a purified sample polyvinyl alcohol resin;
measuring a carbon stable isotope ratio δ 13 C of carbon 13 ( 13 C) in the purified polyvinyl alcohol resin (Ab) and in the purified sample polyvinyl alcohol resin; and
determining whether the sample polyvinyl alcohol resin is a polyvinyl alcohol resin (Ab) in which all or a part of carbon is derived from bio-derived ethylene (Bb) or a polyvinyl alcohol

Assignees

• Kuraray Co

Inventors

• Kazeto Osamu
• Inubushi Yasutaka

Classifications

• C08F116/06

  Polyvinyl alcohol {; Vinyl alcohol} · CPC title

• C08F216/06 Primary

  Polyvinyl alcohol {; Vinyl alcohol} · CPC title

• C08L2203/16

  used for films · CPC title

• C08J2329/04

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

• C08J5/18 Primary

  Manufacture of films or sheets · CPC title