US 11,873,607 B2
Moisture barriers for paper materials
Andries Don Sebastian, Clemmons, NC (US); Pankaj Patel, Clemmons, NC (US); Bruce Bengtsson, Winston Salem, NC (US); Stephanie A. Whittington, Kernersville, NC (US); Erkki Mikael Salo, Espoo (FI); and Tero Tapani Malm, Tampere (FI)
Assigned to R.J. Reynolds Tobacco Company, Winston-Salem, NC (US)
Filed by R.J. REYNOLDS TOBACCO PRODUCTS, Winston-Salem, NC (US)
Filed on Aug. 16, 2019, as Appl. No. 16/543,224.
Application 16/543,224 is a division of application No. 14/543,568, filed on Nov. 17, 2014, granted, now 10,420,370.
Prior Publication US 2019/0380385 A1, Dec. 19, 2019
Int. Cl. D21H 21/16 (2006.01); D21H 27/10 (2006.01); D21H 19/82 (2006.01); C23C 16/455 (2006.01)
CPC D21H 21/16 (2013.01) [C23C 16/45555 (2013.01); D21H 19/82 (2013.01); D21H 27/10 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for making a tobacco packaging material, the method comprising:
extrusion coating at least one repulpable polymer onto a paper material to form a polymer layer;
depositing at least two atomic layer deposition (ALD) layers onto the paper material coated with the polymer layer, wherein the at least two ALD layers comprises at least one metal oxide layer and at least one elastic metal oxide/organic layer; and
heat treating the paper material coated with the polymer layer prior to depositing the at least two ALD layers,
wherein the tobacco packaging material has a water vapor transmission rate (WVTR) that is at least 90% lower than the paper material.