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US 12,043,710 B2Granted
Two-component, water-based lamination adhesive and use of the same to bond substrates and foams
AssigneeHenkel AG & Co. KGaA
InventorsSandeep Kothawade, Girdhari Kumar, Abhijit Hirekerur, Umesh Harkal, Emilie Smith-Heberer
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Abstract
A water comprising, two component polyurethane dispersion adhesive comprising an anionic polyester polyurethane resin and a solvent-free liquid aliphatic polyisocyanate cross-linker. The dispersion can be reactivated one or more times for edge bonding a flexible sheet material onto a substrate having a main surface, a peripheral surface and an edge connecting the main surface and the peripheral surface.
Claims12
A method of bonding a flexible sheet material to a substrate, comprising:
- providing a substrate having a main surface, a peripheral surface angularly arranged to the main surface and an edge connecting the main surface and the peripheral surface;
- providing a flexible sheet material having a second portion extending from a first portion;
- providing a first component of a water-based, two component polyurethane dispersion adhesive;
- providing a second component of the water-based, two component polyurethane dispersion adhesive;
- mixing the first component and the second component to form a mixed, water-based, two component polyurethane dispersion adhesive;
- applying the mixed adhesive to a portion of the main surface and to a portion of the peripheral surface;
- drying the applied adhesive to form a dried polyurethane adhesive layer on the main surface and the peripheral surface;
- applying a first heating cycle to activate the dried polyurethane adhesive layer on the main surface;
- disposing the first portion of the flexible sheet material over the adhesive on the main surface;
- bonding the first portion of material to the main surface;
- optionally, cooling the polyurethane adhesive and substrate surfaces below the adhesive activation temperature;
- applying a second heating cycle after the bonding step to heat the polyurethane adhesive layer on the peripheral surface above a reactivation temperature and reactivate the adhesive on the peripheral surface;
- disposing the second portion of the flexible sheet material over the heated and reactivated adhesive on the peripheral surface to bond the second portion of material to the peripheral surface;
- and
- optionally, cooling the polyurethane adhesive and substrate surfaces below the adhesive reactivation temperature.
12 more elements
Dependencies are inferred from the claim text.