Patent ID: 8088478
Filing Date: 2012-01-03
Classification: B32B,D21H,Y10T

Abstract:
1. A construct having an oxygen barrier property comprising a two layer structure consisting of a first and second attached layers, the first layer being a layer of paper, linerboard or paperboard only, the second layer being a single layer comprising a blend of a nanoparticle calcium carbonate having a size in the range of 10 to 250 nanometers and at least one of a water soluble oxygen barrier material, a water dispersible oxygen barrier material, and a mixture thereof, the weight ratio of nanoparticle calcium carbonate to said water soluble or water dispersible oxygen barrier material being in the range of 1:100 to 1.5:1 and a layer of at least one of a different barrier material, a sealing material, nylon and polyethylene on the side of said second layer opposite said first layer, wherein the construct has a uniform barrier coating and an oxygen transfer rate (OTR) of 30 or less cubic centimeters of gaseous oxygen per square meter per day (cc/m 2 /day) at standard temperature and pressure and 50% relative humidity.