US 12,214,573 B2
Gas barrier laminate and packaging material using the same
Ayumi Tanaka, Tokyo (JP)
Assigned to TOPPAN INC., Tokyo (JP)
Filed by TOPPAN INC., Tokyo (JP)
Filed on Jan. 27, 2022, as Appl. No. 17/585,817.
Application 17/585,817 is a continuation of application No. PCT/JP2020/028924, filed on Jul. 28, 2020.
Claims priority of application No. 2019-138978 (JP), filed on Jul. 29, 2019.
Prior Publication US 2022/0143960 A1, May 12, 2022
Int. Cl. B32B 27/08 (2006.01); B32B 7/12 (2006.01); B32B 27/30 (2006.01); B32B 27/32 (2006.01); B65D 65/40 (2006.01); B65D 65/42 (2006.01); C23C 14/08 (2006.01); C23C 14/10 (2006.01); C23C 14/24 (2006.01)
CPC B32B 27/08 (2013.01) [B32B 7/12 (2013.01); B32B 27/306 (2013.01); B32B 27/32 (2013.01); B65D 65/40 (2013.01); B65D 65/42 (2013.01); C23C 14/081 (2013.01); C23C 14/10 (2013.01); C23C 14/24 (2013.01); B32B 2250/03 (2013.01); B32B 2250/246 (2013.01); B32B 2255/10 (2013.01); B32B 2255/20 (2013.01); B32B 2255/26 (2013.01); B32B 2307/516 (2013.01); B32B 2307/538 (2013.01); B32B 2307/7244 (2013.01); B32B 2307/732 (2013.01); B32B 2553/00 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A packaging material consisting of:
a polypropylene substrate layer;
a first layer consisting essentially of ethylene-vinyl alcohol copolymer, the first layer is directly on the polypropylene substrate layer, the first layer having a mass per unit area of 0.5 to 2.5 g/m2, the first layer is formed on the polypropylene substrate layer by extrusion;
a metal oxide layer consisting of silicon oxide or aluminum oxide, the metal oxide layer is directly on the first layer;
a second layer directly on the metal oxide layer, the second layer consists essentially of polyvinyl alcohol and a silane compound;
an adhesive and
a polypropylene sealant layer bonded to the second layer via the adhesive, wherein a surface of the first layer in contact with the metal oxide layer has a surface roughness Sa of 0.2 μm or less.