One-component laminating adhesive having silane cross-linking

Patent metadata

Field	Value
Publication number	US-10066046-B2
Application number	US-201213548703-A
Country	US
Kind code	B2
Filing date	Jul 13, 2012
Priority date	Jan 14, 2010
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

The invention relates to a crosslinkable one-component laminating adhesive containing 25 to 80 wt. % of polyester prepolymers, polyether prepolymers and/or polyurethane prepolymers, which have at least two cross-linkable alkoxysilane groups and have a molecular weight of 2000 to 30,000 g/mol, 75 to 19 wt. % of organic solvent having a boiling point up to 130° C., 1 to 20 wt. % of polymers which contain anhydride groups, and 0 to 15 wt. % of additives, wherein the viscosity of the adhesive is between 50 and 20,000 mPas (according to DIN ISO 2555), measured at 15 to 45° C.

First claim

The invention claimed is:

1. A crosslinkable one-pack adhesive for bonding flexible multi-layer films, containing:
a) 25 to 80 wt. % of a prepolymer selected from polyester prepolymers, polyurethane prepolymers, and mixtures thereof, wherein the prepolymer has at least two crosslinkable alkoxysilane groups and possesses a molecular weight of 2000 to 30000 g/mol, and wherein at least ½ of the prepolymer is based on polyester polyol,
b) 75 to 19 wt. % of organic solvents with a boiling point of up to 130° C. selected from esters, alcohols or combinations thereof,
c) 1 to 20 wt. % polymers, oligomers and/or monomers which contain one or more anhydride groups, wherein the polymers, oligomers and/or monomers are solid compounds at 25° C. and contain 5 mole % to 60 mole % anhydride groups,
d) 0 to 15 wt. % additives,

wherein the viscosity of the adhesive is between 50 and 20000 mPas (according to DIN ISO 2555), measured at 15 to 45° C. and the adhesive does not contain any catalysts.

2. The one-pack adhesive according to claim 1 , wherein the polyester prepolymer or polyurethane prepolymer is produced from polyester polyols having a molecular weight of 400 to 25000 g/mol, which comprise at least two OH groups.

3. The one-pack adhesive according to claim 1 , wherein the prepolymer contains trialkoxysilane groups.

4. The one-pack adhesive according to claim 1 , wherein the prepolymer contains triethoxysilane groups or trimethoxysilane groups.

5. The one-pack adhesive according to claim 1 , wherein the polymers, oligomers and/or monomers with anhydride groups have cyclic anhydride groups.

6. The one-pack adhesive according to claim 5 , wherein the adhesive contains 2 to 15 wt. % polymers with maleic anhydride (MA) groups.

7. The one-pack adhesive according to claim 5 , wherein the adhesive contains 2 to 15 wt. % MA/styrene copolymers or MA/(meth)acrylate copolymers.

8. A flexible multi-layer film comprising a plurality of films selected from polymer films, paper, foils, metal foils and surface-treated films bonded together by cured reaction products of the one-pack adhesive of claim 1 .

9. The one-pack adhesive according to claim 1 , wherein the glass transition temperature (T g ) of the crosslinked adhesive is between −15 and +30° C.

10. A flexible multi-layer film for the production of food packaging comprising a first film layer selected from polyolefin; polyvinyl chloride; polystyrene; polyester; polyamide; cellophane; metal foil or paper; a second film layer selected from polyolefin; polyvinyl chloride; polystyrene; polyester; polyamide; cellophane; metal foil or paper; and a crosslinkable one-pack adhesive disposed between the first and second layers, the adhesive containing:
a) 25 to 80 wt. % of a prepolymer selected from polyester prepolymers, polyurethane prepolymers, and mixtures thereof, wherein the prepolymer has at least two crosslinkable alkoxysilane groups and possesses a molecular weight of 2000 to 30000 g/mol, and wherein at least 50% of the prepolymer is based on polyester polyol,
b) 75 to 19 wt. % of organic solvents with a boiling point of up to 130° C., the solvents selected from esters, alcohols or combinations thereof,
c) 1 to 20 wt. % polymers, oligomers and/or monomers which contain one or more anhydride groups, wherein the polymers, oligomers and/or monomers are solid compounds at 25° C. and contain 5 mole % to 60 mole % anhydride groups,
d) 0 to 15 wt. % additives,
wherein the viscosity of the crosslinkable adhesive is between 50 and 20000 mPas (according to DIN ISO 2555), measured at 15 to 45° C. and the adhesive does not contain any catalysts.

11. The flexible multi-layer film of claim 10 wherein the first layer is polyolefin.

12. The flexible multi-layer film of claim 10 wherein the first layer is polyolefin and forms one exterior surface of the multi-layer film and the second layer is polyester and forms an opposing exterior surface of the multi-layer film.

13. The flexible multi-layer film of claim 10 , comprising a third film layer selected from polyolefin; polyvinyl chloride; polystyrene; polyester; polyamide; cellophane; metal foil or paper bonded to the first film layer and the second film layer.

14. The flexible multi-layer film of claim 10 comprising a third barrier layer bonded to the first film layer and the second film layer.

15. The flexible multi-layer film of claim 10 wherein cured reaction products of the adhesive bond the first film layer to the second film layer.

Assignees

• Kinzelmann Hans Georg
• Gentschev Pavel
• Henkel Ag & Co Kgaa

Inventors

• Kinzelmann Hans-Georg
• Gentschev Pavel

Classifications

• C09J2425/006

  in the substrate · CPC title

• Y10T428/31797

  Next to addition polymer from unsaturated monomers · CPC title

• Y10T428/31728

  Next to second layer of polyamide · CPC title

• Y10T156/10

  Methods of surface bonding and/or assembly therefor · CPC title

• B32B2250/24

  All layers being polymeric · CPC title