Patent ID: 8932708
Filing Date: 2015-01-13
Classification: A23B,B32B,B65B,Y10T

Abstract:
1. A sulfur dioxide gas generating and gas releasing multi-layer, co-extrusion, tubular article comprising: a conjoined inner layer of low density polyethylene that is moisture-permeable and devoid of sulfur dioxide gas-generating solids and that forms the interior surface of said tubular extrusion; a conjoined middle layer that includes a low density polyethylene polymer containing between 0.1% and 70% by weight of sulfur dioxide gas-generating solid particles dispersed throughout the polymer, the gas-generating solid particles having a particle size of 1 to 15 microns which will generate fast sulfur dioxide release; and a conjoined outer layer that includes a low density polyethylene polymer containing between 0.1% and 70% by weight of sulfur dioxide gas-generating solid particles dispersed throughout the polymer, the gas-generating solid particles having a particle size of 16 to 80 microns which will generate slow sulfur dioxide release over at least 75 days at a temperature of 10° C. or below, wherein the low density polyethylene polymers have a density of 0.89 to 0.93 g/cm wherein the multi-layer co-extrusion tubular article is not greater than 15 mil (0.381 mm) thick, wherein size of the solid particles, the thickness of the layers, the density of the polymers, and the thickness of the tubular article are effective to provide release of sulfur dioxide gas by a release reaction between water vapor and the sulfur dioxide generating solid particles which reaction initially generates a fast release of sulfur dioxide gas followed by a slow release of sulfur dioxide gas to provide microbial control within the tubular article when it is in use as packaging for food.