	US 12,377,582 B2
	Method for recycling filtering facepiece respirators
Anthony Bonnet, Colombes (FR); and Salima Boutti, Serquigny (FR)
Assigned to Arkema France, Puteaux (FR)
Appl. No. 18/008,703
Filed by Arkema France, Colombes (FR)
PCT Filed Jun. 18, 2021, PCT No. PCT/FR2021/051111 § 371(c)(1), (2) Date Dec. 7, 2022, PCT Pub. No. WO2021/255402, PCT Pub. Date Dec. 23, 2021.
Claims priority of application No. 20.06431 (FR), filed on Jun. 19, 2020.
Prior Publication US 2023/0219262 A1, Jul. 13, 2023
Int. Cl. B29B 17/04 (2006.01); B29K 27/00 (2006.01); B29K 105/12 (2006.01); B29L 31/00 (2006.01); B29L 31/48 (2006.01)

CPC B29B 17/0412 (2013.01) [B29B 2017/0484 (2013.01); B29K 2027/16 (2013.01); B29K 2105/124 (2013.01); B29L 2031/4835 (2013.01); B29L 2031/753 (2013.01)]

11 Claims

1. A method for recycling respiratory protection masks containing from 98.5% to 99.5% by weight of a predominant thermoplastic polymer chosen from polypropylene, polyethylene terephthalate, polylactic acid, homopolymers and copolymers of polyamide 6 (PA6) and aliphatic polyamides having an average number of carbons per each nitrogen atom of greater than 8.5, and from 0.05% to 1.5% of PVDF in the form of nanofibers, said method comprising a step of grinding the masks leading to the obtaining of flakes, and a step of granulating said flakes, leading to the obtaining of a masterbatch in the form of granules.