Oxygen barrier coating as a separation layer coating
AssigneeSun Chemical Corporation
InventorsPhilippe Schottland, Glenn Webster
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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.
Claims17
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 in Hansen space 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
-
- D
- s
-
- 1
- -
- δ
-
- D
- c
- )
- 2
- +
- (
- δ
-
- P
- s
-
- 1
- -
- δ
-
- P
- c
- )
- 2
- +
- (
- δ
-
- H
- s
-
- 1
- -
- δ
-
- H
- c
- )
- 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.
Dependencies are inferred from the claim text.