Patent ID: 6361728
Filing Date: 2002-03-26
Classification: B32B,Y10T

Abstract:
A process for preparing a multi-layer sheet of plastic material which feels like and has at least some of the properties of paper, having an outer layer, a middle layer, and an inner layer, comprising:providing a first composition for an outer layer comprising between about 40 and 90 weight percent polyethylene, between about 5 and 50 weight percent of a finely granulated material adapted to give a feel of paper to said multi-layer sheet, and between about 5 and 10 weight percent of a pigment; providing a second composition for a middle layer comprising between about 60 and 95 weight percent polyethylene, between about 0 to 20 weight percent of said finely granulated material, and between about 5 and 20 weight percent of said pigment; providing a third composition for an inner layer comprising, between about 70 and 98 weight percent polyethylene, between about 0 and 10 weight percent of a filler, and between about 0 and 20 weight percent of said pigment; and separately co-extruding said first, second, and third compositions and feeding said co-extruded compositions to a die, and laminating same to constitute said multi-layer sheet of plastic material, wherein said outer layer comprises between about 15 to 35 weight percent, said middle layer comprises about 30 to 70 weight percent, and said inner layer comprises about 15 to 35 weight percent, all with respect to the entire weight of said multi-layer sheet.