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US 2025/0011565 A1Published application
New method for recycling of polyurethane
AssigneeEvonik Operations GmbH
InventorsGeorg Borchers, Hubert Müller, Jörg Röder, Natalia Hinrichs-Tontrup, Brigitte Mess, Malte Fischer, Marina Lazar, Andree Blesgen, Jens Hildebrand
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Abstract
A new method for recycling polyurethane, in particular polyurethane foam via solvolysis can be performed. The new method includes a very efficient pre-treatment method of the polyurethane, wherein it is converted into a polyurethane dispersion. The method also includes providing the polyurethane, preparing a dispersion, and solvolyzing the dispersion. The polyurethane has an average particle size of 0.1 to 12 mm.
Claims20
A method of solvolyzing a polyurethane, the method comprising:
- a. providing the polyurethane,
- b. preparing a dispersion from the polyurethane, and
- c. solvolyzing a polyurethane dispersion, wherein
- the polyurethane to be dispersed has an average particle size, measured by a laser diffraction analyzer, of 0.1 to 12 mm, and
- the polyurethane content in the dispersion after b. and/or the dispersion used for c. is in a range of from 4 to 20 percent by weight.
2 more elements
Dependencies are inferred from the claim text.