Multilayer polyolefin substrate with low density core and stiff outer layers
First Claim
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1. A thermoplastic structure comprising:
- a) a low density core layer comprising polypropylene, highly crystalline polypropylene or high density polyethylene, said core layer having a density in the range of from 0.1 to 0.7 grams per cubic centimeters;
b) a top outer layer comprising highly crystalline polypropylene or high density polyethylene, said top outer layer being exterior to, and on a first side of, said core layer; and
c) a bottom outer layer comprising highly crystalline polypropylene or high density polyethylene, said bottom outer layer being exterior to, and on a side of, said core layer;
wherein the thickness of said core layer is about 60 to about 95% of the overall thickness of said structure;
wherein said structure is biaxially oriented; and
wherein the stiffness of said structure in the machine direction is in a range from about 0.015 to about 0.15 pound force-centimeters.
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Abstract
A biaxially oriented thermoplastic structure including a low density core layer formed from polypropylene, highly crystalline polypropylene or high density polyethylene, and outer layers formed from highly crystalline polypropylene or high density polyethylene. The thickness of the core layer is about 60 to about 95% of the overall thickness of the structure. The stiffness of the structure in the machine direction is in a range from about 0.015 to about 0.15 pound force-centimeters.
51 Citations
20 Claims
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1. A thermoplastic structure comprising:
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a) a low density core layer comprising polypropylene, highly crystalline polypropylene or high density polyethylene, said core layer having a density in the range of from 0.1 to 0.7 grams per cubic centimeters;
b) a top outer layer comprising highly crystalline polypropylene or high density polyethylene, said top outer layer being exterior to, and on a first side of, said core layer; and
c) a bottom outer layer comprising highly crystalline polypropylene or high density polyethylene, said bottom outer layer being exterior to, and on a side of, said core layer;
wherein the thickness of said core layer is about 60 to about 95% of the overall thickness of said structure;
wherein said structure is biaxially oriented; and
wherein the stiffness of said structure in the machine direction is in a range from about 0.015 to about 0.15 pound force-centimeters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification