Patent ID: 6299809
Filing Date: 2001-10-09
Classification: C08J,Y10S

Abstract:
In a method of making a foamed polyethylene sheet, the steps of:(a) forming a foamable melt consisting essentially of low density polyethylene, a nucleating agent in the amount of up to 200 grams of nucleating agent per 800 pounds of polyethylene, glycerol monostearate in an amount of about one to four percent by weight of the polyethylene, and a blowing agent consisting of about 50 to 95 mole percent ethane, and 5 to 50 mole percent isobutane,(b) passing the melt through an annular extrusion die to form an elongated tube of extruded material(c) expanding the extruded material, and(d) slitting the tube in a lengthwise direction and unrolling the material to form a sheet of the expanded material.