US 12,115,764 B2
Plastomer toughened/stiffened polyolefin multilayer films and laminates comprising same
Elodie Hablot, Horgen (CH); Salma El Marrasse Zarioui, Tarragona (ES); and Peter Hermann Roland Sandkuehler, Horgen (CH)
Assigned to Dow Global Technologies LLC, Midland, MI (US)
Appl. No. 17/762,414
Filed by Dow Global Technologies LLC, Midland, MI (US)
PCT Filed Sep. 29, 2020, PCT No. PCT/US2020/053222
§ 371(c)(1), (2) Date Mar. 22, 2022,
PCT Pub. No. WO2021/067240, PCT Pub. Date Apr. 8, 2021.
Claims priority of application No. 19382838 (EP), filed on Sep. 30, 2019.
Prior Publication US 2023/0147444 A1, May 11, 2023
Int. Cl. B32B 27/32 (2006.01); B32B 7/027 (2019.01); B32B 7/12 (2006.01); B32B 27/08 (2006.01); B32B 27/36 (2006.01); B65D 75/00 (2006.01); C08L 23/06 (2006.01)
CPC B32B 27/32 (2013.01) [B32B 7/027 (2019.01); B32B 7/12 (2013.01); B32B 27/08 (2013.01); B32B 27/36 (2013.01); B65D 75/008 (2013.01); C08L 23/06 (2013.01); B32B 2250/24 (2013.01); B32B 2270/00 (2013.01); B32B 2274/00 (2013.01); B32B 2307/516 (2013.01); B32B 2307/518 (2013.01); B32B 2307/546 (2013.01); B32B 2307/558 (2013.01); B32B 2307/72 (2013.01); B32B 2307/732 (2013.01); B32B 2439/46 (2013.01); C08L 2205/02 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A laminate, comprising,
(i) a substrate film comprising a biaxially oriented polyethylene terephthalate film, a biaxially oriented polypropylene film, or an oriented polyethylene film;
(ii) a multilayer film comprising;
a first layer formed from a first polyolefin composition consisting essentially of:
(a) 80 to 99.9 weight percent (wt. %) of a high density polyethylene (HDPE) resin having a density from 0.935 to 0.966 g/cm3 measured according to ASTM D792 and a melt index (I2) of 0.3 to 8 g/10 minutes measured at 190° C./2.16 kg according to ASTM D-1238, the wt. % based on the total weight of the first polyolefin composition; and
(b) 0.1 to 20 wt. % of a propylene-ethylene copolymer thermoplastic elastomer (TPE) comprising at least 60 wt. % of units derived from propylene and at least 0.1 wt. % of units derived from ethylene and having a density of 0.850 to 0.900 g/cm3 measured according to ASTM D792 and a melt index, I2, of 0.1 to 15 g/10 minutes measured at 230° C./2.16 kg according to ASTM D-1238, the wt. % based on the total weight of the first polyolefin composition; and
a sealant layer on the first layer, wherein the sealant layer has a thickness in a range of 5 micrometers (μm) to 15 μm and wherein the multilayer film has a total thickness in a range of 60 μm to 400 μm; and
(iii) an adhesive layer comprising polyurethane, formed from a solvent-free adhesive or a solvent-based adhesive, in adhering contact with the substrate film and the first layer of the multilayer film, wherein when the adhesive layer is formed from the solvent-free adhesive the adhesive layer has an elastic modulus of greater than 25 MPa, and when the adhesive layer is formed from the solvent-based adhesive the adhesive layer has an elastic modulus of greater than 0.30 MPa, the elastic modulus being measured for the polyurethane in accordance with ASTM D412.