Oxygen barrier coating as a separation layer coating

Patent metadata

Field	Value
Publication number	US-2024217221-A1
Application number	US-202218558296-A
Country	US
Kind code	A1
Filing date	May 20, 2022
Priority date	May 20, 2021
Publication date	Jul 4, 2024
Grant date	—

Abstract

The present invention provides a recyclable laminate film structure comprising a separation layer coating. The separation layer coating facilitates separation of a selected polymer film during the recycling processing by selecting the polymer of the coating composition to have particular Hansen Solubility Parameters, so that the laminate structure delaminates at the layer of the coating, leaving clean pieces of the selected polymer film. In certain embodiments, the separation layer coating is a barrier coating, such as an oxygen barrier coating.

First claim

1 . A method of preparing recyclable packaging laminate film structure, comprising:
(a) providing a first polymeric substrate and a second polymeric substrate, wherein the polymer of the first substrate has Hansen Solubility Parameters (HSP) of δDs1 (dispersion), δPs1 (polar), and δHs1 (hydrogen bonding); (b) applying and curing a separation layer coating composition onto the first polymeric substrate, wherein the separation layer coating composition comprises a polymer, wherein the polymer of the separation layer coating composition has HSP of δDc, δPc, and δHc, and Roc (radius of the sphere of solubility); (c) wherein the distance between the polymer of the first polymeric substrate and the polymer of the separation coating composition Ra(s1,c) based on the HSP parameters of each polymer is 5 to 25, calculated according to the following equation (1):

Ra
⁢

(

s
⁢
1

,

c
)

⁢
2

=

4
×

(

δ
⁢
Ds
⁢
1

-

δ
⁢
Dc

)

⁢
2

+

(

δ
⁢
Ps
⁢
1

-

δ
⁢
Pc

)

⁢
2

+

(

δ
⁢
Hs
⁢
1

-

δ
⁢
Hc

)

⁢
2

(d) applying a lamination adhesive layer either on the same side as the separation layer coating or on the side of the second polymeric substrate; and
(e) forming a laminate structure wherein the separation layer coating and the adhesive are sandwiched between the first and second substrate;
wherein the formed laminate is suitable for sealing to itself or to a pre-formed rigid or flexible shape to create a package or container.

2 . A method of forming a laminated package or container, comprising:
(a) providing the laminate film structure of claim 1 ; and (b) sealing the laminate film structure to itself or to a pre-formed rigid or flexible shape to create a package or a container.

3 . A method of obtaining clean pieces of the first polymeric substrate of claim 1 during recycling, comprising:
(a) washing the laminate film structure of claim 1 , or package or container comprising the laminate film structure of claim 2 , in a washing solution, wherein the washing solution has HSP of δDw, δPw, and δHw;
(b) wherein the relative energy difference (RED) between the polymer of the separation layer coating and the washing solution is less than or equal to 1, according to equation (2):

REDc
,

w
=

R
⁢

a
⁡
(

c
,
w

)

/
Roc

wherein Ra(c,w) is calculated according to equation (3);

R
⁢

a
⁡
(

c
,
w

)

⁢
2

=

4
×

(

δ
⁢
Dc

-

δ
⁢
D
⁢
w

)

⁢
2

+

(

δ
⁢
P
⁢
c

-

δ
⁢
P
⁢
w

)

⁢
2

+

(

δ
⁢
H
⁢
c

-

δ
⁢
H
⁢

Assignees

• Sun Chemical Corp

Inventors

• Schottland Philippe
• Webster Glenn

Classifications

• C08J2479/02

  Polyamines · CPC title

• C08J2429/04

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

• C08J2377/00

  Characterised by the use of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Derivatives of such polymers · CPC title

• C08J2367/02

  Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence) · CPC title

• C08J2323/12

  Polypropene · CPC title