US 11,813,826 B2
Antistatic stretch film
Marcus Harald Bluemel, Lemfoerde (DE); Hilar Altenhofer, Ludwigshafen (DE); Frank Schaefer, Lemfoerde (DE); Johannes Fischer, Ludwigshafen (DE); Anja Oltmanns, Lemfoerde (DE); and Torsten Neises, Ludwigshafen (DE)
Assigned to BASF SE, Ludwigshafen am Rhein (DE)
Appl. No. 17/996,320
Filed by BASF SE, Ludwigshafen am Rhein (DE)
PCT Filed Apr. 8, 2021, PCT No. PCT/EP2021/059230
§ 371(c)(1), (2) Date Oct. 14, 2022,
PCT Pub. No. WO2021/209319, PCT Pub. Date Oct. 21, 2021.
Claims priority of application No. 20169914 (EP), filed on Apr. 16, 2020.
Prior Publication US 2023/0131631 A1, Apr. 27, 2023
Int. Cl. B32B 27/08 (2006.01); B32B 7/12 (2006.01); B32B 25/08 (2006.01); B32B 25/14 (2006.01); B32B 27/18 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B32B 27/40 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 7/12 (2013.01); B32B 25/08 (2013.01); B32B 25/14 (2013.01); B32B 27/18 (2013.01); B32B 27/30 (2013.01); B32B 27/302 (2013.01); B32B 27/304 (2013.01); B32B 27/306 (2013.01); B32B 27/32 (2013.01); B32B 27/40 (2013.01); B32B 2250/242 (2013.01); B32B 2270/00 (2013.01); B32B 2274/00 (2013.01); B32B 2307/21 (2013.01); B32B 2307/51 (2013.01)] 15 Claims
 
1. A stretchable film, comprising:
at least two layers, comprising a layer A and a layer B, each layer having an inner surface being in contact with the respective other layer, and an outer surface being opposite the inner surface,
wherein
layer A comprises a polymer 1 composition, and
layer B comprises a thermoplastic polyurethane composition, and optionally a polymer 2 composition, wherein a polyurethane in the thermoplastic polyurethane composition is prepared from:
an organic diisocyanate,
a polyol comprising a diol A and a diol B, wherein the diol A comprises ethoxy and propoxy groups and the diol B comprises butoxy groups, and
a chain extender;
wherein the thermoplastic polyurethane composition comprises a salt, an ionic liquid, or a salt and an ionic liquid,
wherein the stretchable film has an elongation at break of more than 50% measured according to DIN ISO 53504, 2017-03, and
wherein the stretchable film comprises an adhesive on an outer surface of the stretchable film, wherein the adhesive comprises ultra-low-density polyethylene (ULDPE).