	US 11,859,065 B1
	Up-cycling waste polypropylene as superhydrophobic sheets
Junaid Saleem, Al-Ahsa (SA); Safdar Hossain SK, Al-Ahsa (SA); Zubair Khalid Baig Moghal, Al-Ahsa (SA); and Gordon McKay, Al-Ahsa (SA)
Assigned to KING FAISAL UNIVERSITY, Al-Ahsa (SA)
Filed by KING FAISAL UNIVERSITY, Al-Ahsa (SA)
Filed on Apr. 12, 2023, as Appl. No. 18/133,985.
This patent is subject to a terminal disclaimer.
Int. Cl. C08J 11/08 (2006.01); C08J 7/04 (2020.01); C09D 123/12 (2006.01); C09D 5/08 (2006.01); C09D 5/16 (2006.01); C09D 7/20 (2018.01)

CPC C08J 7/042 (2013.01) [C08J 11/08 (2013.01); C09D 5/08 (2013.01); C09D 5/1681 (2013.01); C09D 7/20 (2018.01); C09D 123/12 (2013.01); C08J 2323/12 (2013.01)]

12 Claims

1. A freestanding superhydrophobic sheet comprising:

a strong, nonporous support base layer comprising polypropylene (PP) isolated from plastic waste made through spin casting followed by annealing and having a thickness of 3 μm to 170 μm; and

a porous top layer comprising polypropylene (PP) isolated from plastic waste made through spin casting on the strong, nonporous support base layer, and comprising a superhydrophobic surface and having a thickness of 7 μm to 170 μm,

wherein the superhydrophobic sheet has a total thickness of 10 μm to 340 μm and is peeled off from the solid substrate.