One-component laminating adhesive having silane cross-linking
AssigneeHenkel AG & Co. KGaA
InventorsHans-Georg Kinzelmann, Pavel Gentschev
Life of this patent
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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.
Claims15
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.
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.
Dependencies are inferred from the claim text.