	US 11,999,132 B2
	Heat sealable packaging material comprising microfibrillated cellulose and products made therefrom
Kaj Backfolk, Villmanstrand (FI); Isto Heiskanen, Imatra (FI); Esa Saukkonen, Lappeenranta (FI); Jukka Kankkunen, Imarta (FI); Ville Ribu, Lappeenranta (FI); and Kimmo Nevalainen, Kotka (FI)
Assigned to Stora Enso OYJ, Helsinki (FI)
Appl. No. 16/500,033
Filed by Stora Enso OYJ, Helsinki (FI)
PCT Filed Mar. 28, 2018, PCT No. PCT/IB2018/052132 § 371(c)(1), (2) Date Oct. 1, 2019, PCT Pub. No. WO2018/185611, PCT Pub. Date Oct. 11, 2018.
Claims priority of application No. 1750411-9 (SE), filed on Apr. 3, 2017.
Prior Publication US 2020/0171796 A1, Jun. 4, 2020
Int. Cl. B32B 15/085 (2006.01); B32B 15/20 (2006.01); B32B 27/10 (2006.01); B65D 65/40 (2006.01); B65D 65/42 (2006.01); C08J 5/18 (2006.01); D21H 11/18 (2006.01); D21H 19/04 (2006.01); D21H 19/08 (2006.01); D21H 19/22 (2006.01); D21H 19/82 (2006.01); D21H 19/84 (2006.01); D21H 27/10 (2006.01)

CPC B32B 15/085 (2013.01) [B32B 15/20 (2013.01); B32B 27/10 (2013.01); B65D 65/40 (2013.01); B65D 65/42 (2013.01); C08J 5/18 (2013.01); D21H 11/18 (2013.01); D21H 19/04 (2013.01); D21H 19/08 (2013.01); D21H 19/22 (2013.01); D21H 19/824 (2013.01); D21H 19/84 (2013.01); D21H 27/10 (2013.01); B32B 2307/7244 (2013.01); B32B 2439/70 (2013.01); C08J 2323/06 (2013.01)]

11 Claims

1. A packaging material comprising:

a layer that comprises at least 60% by weight of microfibrillated cellulose, and

a continuous aluminum layer having a thickness of 1 to less than 3 μm and an amount of aluminum of 3 to 10 g/m²packaging material,

wherein the layer comprising microfibrillated cellulose is laminated or extrusion coated with a thermoplastic polymer in an amount of at least 5 g/m²and the amount of aluminum is sufficient to make the packaging material heat sealable by induction;

wherein the layer comprising microfibrillated cellulose has a grammage between 10 to 50 g/m²and an oxygen transmission rate of less than 20 cm³/m²·day (50% RH, 23° C.); and

wherein the packaging material exhibits an oxygen transmission rate of less than 5 cm³/m²·day (50% RH, 23° C.).