Method of bonding to foil

Patent metadata

Field	Value
Publication number	US-9605117-B2
Application number	US-201315029053-A
Country	US
Kind code	B2
Filing date	Oct 15, 2013
Priority date	Oct 15, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

Provided is a waterborne adhesive composition comprising (i) an aqueous medium; (ii) one or more isocyanate compounds dispersed in said aqueous medium, and (iii) one or more functional silane compounds dispersed in said aqueous medium. Also provided is a method of bonding a metal foil to a polymeric film comprising the steps of (A) applying a layer of the waterborne adhesive composition to a surface of said metal foil, (B) drying said layer of said adhesive composition to produce a layer of dried adhesive, and (C) after said drying, bringing a surface of a polymeric film into contact with said layer of said dried adhesive composition.

First claim

The invention claimed is:

1. A method of bonding a metal foil to a polymeric film comprising the steps of
(A) applying a layer of a waterborne adhesive composition to a surface of said metal foil,
(B) drying said layer of said adhesive composition to produce a layer of dried adhesive, and
(C) after said drying, bringing a surface of a polymeric film into contact with said layer of said dried adhesive composition,
wherein said waterborne adhesive composition comprises
(i) an aqueous medium
(ii) one or more isocyanate compounds dispersed in said aqueous medium, wherein said one or more isocyanate compounds comprise one or more hydrophilically modified isocyanate trimers that have the structure

wherein the three R groups are the same as each other, wherein the three R groups are aliphatic, and wherein G is an organic group that contains a hydrophilic group selected from the group consisting of hydrophilic alkylene oxide groups, anionic sulfate groups, and anionic carboxylate groups, and
(iii) one or more functional silane compounds dispersed in said aqueous medium.

2. The method of claim 1 , wherein said polymeric film is polyolefin.

3. The method of claim 1 , wherein said one or more isocyanate compounds comprise one or more urethane prepolymer, wherein said urethane prepolymer comprises the reaction product of 4,4′-MDI with one or more polyol.

4. The method of claim 1 , wherein said waterborne adhesive composition additionally comprises one or more non-urethane polymers that comprises polymerized units of one or more acrylic monomers.

5. The method of claim 1 , wherein the polymeric film is polyethylene.

6. The method of claim 1 , wherein the metal foil is aluminum foil.

7. The method of claim 1 , wherein the polymeric film is polyolefin and wherein the metal foil is aluminum foil.

8. The method of claim 1 , wherein the polymeric film is polyethylene and wherein the metal foil is aluminum foil.

9. The method of claim 1 , wherein G is an organic group comprising —(CH 2 CH 2 O) n — wherein n is 3 to 50.

10. The method of claim 1 , wherein step (C) is performed by a method comprising the use of a heated compression nip.

Assignees

• Rohm & Haas

Inventors

• Qu Zhaohui
• Fan Ling
• Chen Mai

Classifications

• C08J2323/00

  Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers · CPC title

• C08G18/4825

  Polyethers containing two hydroxy groups (C08G18/4833 - C08G18/5096 take precedence) · CPC title

• C08J2475/00

  Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers · CPC title

• C08G18/48

  Polyethers · CPC title

• B32B2311/00

  Metals, their alloys or their compounds · CPC title