Method of making zipper pouch
AssigneeDow Global Technologies LLC
InventorPrem K. Chaturvedi
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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.
Claims15
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.
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.
Dependencies are inferred from the claim text.