US 12,330,400 B2
Polypropylene film with increased hydrophobicity
Karin Irene van de Wetering, Bergen op Zoom (NL); and Xiqiang Liu, Shanghai (CN)
Assigned to SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
Appl. No. 17/799,808
Filed by SABIC GLOBAL TECHNOLOGIES B.V., Bergen op Zoom (NL)
PCT Filed Feb. 2, 2021, PCT No. PCT/EP2021/052425
§ 371(c)(1), (2) Date Aug. 15, 2022,
PCT Pub. No. WO2021/175524, PCT Pub. Date Sep. 10, 2021.
Claims priority of application No. 20160643 (EP), filed on Mar. 3, 2020.
Prior Publication US 2023/0080269 A1, Mar. 16, 2023
Int. Cl. B32B 27/08 (2006.01); B32B 3/30 (2006.01); B32B 5/14 (2006.01); B32B 7/12 (2006.01); B32B 27/18 (2006.01); B32B 27/32 (2006.01); B32B 27/36 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 3/30 (2013.01); B32B 5/147 (2013.01); B32B 7/12 (2013.01); B32B 27/18 (2013.01); B32B 27/32 (2013.01); B32B 27/36 (2013.01); B32B 27/365 (2013.01); B32B 2250/242 (2013.01); B32B 2270/00 (2013.01); B32B 2307/412 (2013.01); B32B 2307/73 (2013.01); B32B 2307/732 (2013.01); B32B 2457/12 (2013.01); B32B 2605/006 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A multi-layer polypropylene film comprising:
a base layer of a polypropylene (PP);
optionally, a tie layer comprising a blend of polypropylene and a sacrificial engineering thermoplastic selected from polybutylene terephthalate (PBT) or polycarbonate (PC); and
a top layer comprising a film having a structured surface with a water contact angle of greater than 104.5°;
wherein the top layer comprises a blend 20 to 40 wt % of the polypropylene and 60 to 80 wt % of said sacrificial engineering thermoplastic and in which the sacrificial engineering thermoplastic has been selectively etched in order to create the said structured surface.