Method of making zipper pouch

Patent metadata

Field	Value
Publication number	US-12454124-B2
Application number	US-202017756539-A
Country	US
Kind code	B2
Filing date	Nov 9, 2020
Priority date	Dec 23, 2019
Publication date	Oct 28, 2025
Grant date	Oct 28, 2025

Abstract

Provided is a process for preparing a zipper pouch, wherein the process comprises: A) forming a first laminate by a process comprising i) bringing together a polyisocyanate component and a polyol component to form an adhesive composition, ii) applying a layer of the adhesive composition to a layer of polyethylene terephthalate, iii) then contacting the layer of the adhesive composition with a layer of polyethylene having thickness of 80 micrometer or more; B) contacting a polymeric zipper construction to the first laminate at temperature of 200 C or higher. Also provided is a zipper pouch made by that process.

First claim

The invention claimed is:

1. A process for preparing a zipper pouch, wherein the process comprises:
A) forming a first laminate by a process comprising
i) bringing together a polyisocyanate component and a polyol component to form a solventless adhesive composition having 0 wt % solvent,
wherein the polyisocyanate component comprises a polyisocyanate prepolymer comprising

(a) an isocyanate monomer, and
(b) a polyester polyol formed from
diethylene glycol,
adipic acid, and
neopentyl glycol, and
wherein the polyol component comprises 1% to 15% by weight, based on the weight of the polyol component, of a phosphate functional compound,
wherein the adhesive composition comprises a weight ratio of the polyisocyanate component to the polyol component from 1.5:1 to 4.5:1,

ii) applying a layer of the adhesive composition to a layer of polyethylene terephthalate,
iii) then contacting the layer of the adhesive composition with a layer consisting of polyethylene and having a thickness of 80 micrometer or more,

B) contacting a polymeric zipper construction comprising a pocket and a rail to the first laminate at temperature of 200° C. or higher.

2. The process of claim 1 , wherein the polyol component additionally comprises from 10% to 50% by weight, based on the weight of the polyol component, of one or more polyester polyol and 50% to 90% by weight, based on the weight of the polyol component, of one or more polyether polyol.

3. The process of claim 2 , wherein the process comprises an additional step of contacting the zipper construction to a second laminate at a temperature of 200° C. or higher, wherein the second laminate is formed by a process comprising the steps
i) bringing together a polyisocyanate component and a polyol component to form a solventless adhesive composition,
wherein the polyisocyanate component comprises the polyisocyanate prepolymer, and
wherein the polyol component comprises 1% to 15% by weight, based on the weight of the polyol component, of a phosphate functional compound,
wherein the adhesive composition comprises a weight ratio of the polyisocyanate component to the polyol component from 1.5:1 to 4.5:1,

ii) applying a layer of the adhesive composition to a layer of polyethylene terephthalate,
iii) then contacting the layer of the adhesive composition with a layer consisting of polyethylene having thickness of 80 micrometer or more,
wherein the second laminate may have the same composition as the first laminate or may have a different composition from the first laminate.

4. A zipper pouch made by the process of claim 1 .

5. The process of claim 1 , wherein the polyester polyol has a molecular weight not to exceed 4,000 g/mol.

6. The process of claim 5 , wherein the isocyanate monomer is an aromatic isocyanate.

7. The process of claim 1 wherein the layer consisting of polyethylene is a monolayer film.

8. The process of claim 7 wherein the layer of polyethylene terephthalate consists of polyethylene terephthalate.

9. A process for preparing a zipper pouch, wherein the process comprises:
A) forming a first laminate by a process comprising
i) bringing together a polyisocyanate component and a polyol component to form a solventless adhesive composition having 0 wt % solvent,
wherein the polyisocyanate component comprises a polyisocyanate prepolymer that is the reaction product of

(a) an isocyanate monomer, and
(b) a polyester polyol formed from
diethylene glycol,
adipic acid, and
neopentyl glycol, and
wherein the polyol component comprises 1% to 15% by weight, based on the weight of the polyol component, of a phosphate functional compound,
wherein the adhesive composition comprises a weight ratio of the polyisocyanate component to the polyol component from 1.5:1 to 4.5:1,

ii) applying a layer of the adhesive composition to a first film of polyethylene terephthalate,
iii) then contacting the layer of the adhesive composition with a second film that is a monolayer film consisting of polyethylene,

B) contacting a polymeric zipper construction comprising a pocket and a rail to the first laminate at temperature of 200° C. or higher.

10. The process of claim 9 wherein the second film has a thickness of 80 micrometers or more.

11. The process of claim 10 wherein the second film has a thickness of 130 micrometers.

12. The process of claim 9 , wherein the polyol component additionally comprises from 10% to 50% by weight, based on the weight of the polyol component, of one or more polyester polyol and 50% to 90% by weight, based on the weight of the polyol component, of one or more polyether polyol.

13. The process of claim 9 , wherein the process comprises an additional step of contacting the zipper construction to a second laminate at a temperature of 200° C. or higher, wherein the second laminate is formed by a process comprising the steps
i) bringing together a polyisocyanate component and a polyol component to form a solventless adhesive composition,
wherein the polyisocyanate component comprises the polyisocyanate prepolymer, and
wherein the polyol component comprises 1% to 15% by weight, based on the weight of the polyol component, of a phosphate functional compound,
wherein the adhesive composition comprises a weight ratio of the polyisocyanate component to the polyol component from 1.5:1 to 4.5:1,

ii) applying a layer of the adhesive composition to a third film of polyethylene terephthalate,
iii) then contacting the layer of the adhesive composition with a fourth film that is a monolayer film consisting of polyethylene,
wherein the second laminate may have the same composition as the first laminate or may have a different composition from the first laminate.

14. The process of claim 13 wherein the fourth film has a thickness of 80 micrometers or more.

15. The process of claim 13 wherein the fourth film has a thickness of 130 micrometers.

Assignees

• Dow Global Technologies Llc

Inventors

• Chaturvedi Prem K

Classifications

• C09J2475/00

  Presence of polyurethane · CPC title

• C09J2467/008

  in the pretreated surface to be joined · CPC title

• C09J2423/048

  in the pretreated surface to be joined · CPC title

• C09J175/04

  Polyurethanes · CPC title

• C09J5/00

  Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers · CPC title