Process for recycling of bonded articles
AssigneeBASF SE
InventorsUlrike Licht, Oliver Hartz, Lionel Gehringer, Sabine Bociek, Erich Ries, Juergen Ahlers, Stephan Dohmen
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Abstract
A method is described for debonding a bonded article. The bonded article comprises at least two components which are bonded to one another by means of a polyurethane adhesive selected from aqueous polyurethane dispersion adhesives and polyurethane hotmelt adhesives. At least one of the components is a thermoplastic polyurethane. The components are debonded by treatment with an aqueous surfactant composition at elevated temperatures.
Claims18
A method for debonding a bonded article,
- wherein the bonded article comprises at least a first component and a second component which are bonded to one another by means of a polyurethane adhesive with a K value of not more than 100, measured as 1 wt. % solution in DMF at 25° C.;
- wherein the first component is made from a thermoplastic polymer;
- wherein the polyurethane adhesive is selected from the group consisting of aqueous polyurethane dispersion adhesives and polyurethane hotmelt adhesives;
- and the at least two components are debonded by treatment with an aqueous surfactant composition at a temperature from 60° C. to 130° C., and at a pH of 4 to 12.
A recyclable article of footwear or portion thereof comprising a first component, a second component, and a polyurethane adhesive adhesively bonding the first component to the second component wherein at least one of the components is a thermoplastic polyurethane, wherein the polyurethane adhesive has a K value of not more than 100, measured as 1 wt % solution in DMF at 25° C. and is selected from aqueous polyurethane dispersion adhesives and polyurethane hotmelt adhesives;
- and the at least two components are debondable by treatment with an aqueous surfactant composition at a temperature from 60° C. to 130° C. and at a pH of 4 to 12.
Dependencies are inferred from the claim text.