Laminates including cellulosic materials and processes for making and usng the same
AssigneeLoparex, Inc.
InventorLeRoy Herbert Keiser
Life of this patent
Estimating the term…
Abstract
Laminates including cellulosic material are provided which exhibit dimensional stability upon exposure to changes in ambient moisture. The laminates include at least two layers formed of a cellulosic material sandwiching and bonded to an inner polymeric layer. The polymer layer is thicker than either of the cellulosic layers.
Claims93
A laminate including cellulosic material exhibiting substantial dimensional stability upon exposure to changes in ambient moisture, comprising:
- first and second layers comprising a cellulosic material, each of said first and second layers defining a thickness;
- and
- a layer comprising a polymer disposed between but without substantially completely impregnating either of said cellulosic layers, said polymer layer having a greater thickness than either of the first and second cellulosic layers.
A laminate including cellulosic material exhibiting substantial dimensional stability upon exposure to changes in ambient moisture, comprising:
- first and second cellulosic layers, at least one of said cellulosic layers comprising a polymer coating on at least one surface thereof, each of said first and second cellulosic layers further defining a thickness;
- and
- a polymer extruded between but without substantially completely impregnating either of said cellulosic layers, so that the polymer coating of said cellulosic layer is adjacent said extruded polymer layer, wherein the extruded polymer and the polymer coating of the cellulosic layer form a polymer layer having a greater thickness than either of the first and second cellulosic layers.
A method of making a laminate including cellulosic material exhibiting substantial dimensional stability upon exposure to changes in ambient moisture, the method comprising:
- extruding a molten polymer onto a surface of a first cellulosic substrate to form a molten polymer layer thereon;
- bringing said first cellulosic substrate and a second cellulosic substrate together into opposing surface-to-surface relationship so that said molten polymer layer is sandwiched between and bonds together said first and second cellulosic substrates without substantially completely impregnating either of said cellulosic layers, said polymer layer defining a thickness which is greater than the thickness of either of said cellulosic layers;
- and
- cooling said molten polymer layer to form a coherent laminate structure.
A method of making a laminate including cellulosic material exhibiting substantial dimensional stability upon exposure to changes in ambient moisture, the method comprising:
- providing a first cellulosic substrate having a polymer coating on at least one surface thereof;
- extruding a molten polymer onto said polymer coated surface of said cellulosic substrate to form a molten polymer layer thereon;
- bringing said first cellulosic substrate and a second cellulosic substrate also having a polymer coating on a surface thereof together into opposing surface-to-surface relationship so that said molten polymer layer is sandwiched between said polymer coated surfaces of each of said cellulosic substrates and bonds together said first and second cellulosic substrates without substantially completely impregnating either of said cellulosic layers, said polymer coated layers and said extruded polymer layer defining a thickness which is greater than the thickness of either of said cellulosic layers;
- and
- cooling said molten polymer layer to form a coherent laminate structure.
A release liner including cellulosic material and exhibiting substantial dimensional stability upon exposure to changes in ambient moisture, comprising:
- first and second layers comprising a cellulosic material, each of said first and second layers defining a thickness;
- a layer comprising a polymer disposed between but without substantially completely impregnating either of said cellulosic layers, said polymer layer further having a greater thickness than either of the first and second cellulosic layers;
- and
- a release coating on at least one outer surface of said laminate.
A release liner including cellulosic material exhibiting substantial dimensional stability upon exposure to changes in ambient moisture, comprising:
- first and second cellulosic layers, at least one of said cellulosic layers comprising a polymer coating on at least one surface thereof, each of said first and second cellulosic layers further defining a thickness;
- a polymer extruded between but without substantially completely impregnating either of said cellulosic layers, so that the polymer coating of said cellulosic layer is adjacent said extruded polymer layer, wherein the extruded polymer and the polymer coating of the cellulosic layer form a polymer layer having a greater thickness than either of the first and second cellulosic layers;
- and
- a release coating on at least one outer surface of said cellulosic layers.
A method of making a release liner including cellulosic material exhibiting substantial dimensional stability upon exposure to changes in ambient moisture, the method comprising:
- extruding a molten polymer onto a surface of a first cellulosic substrate to form a molten polymer layer thereon;
- bringing said first cellulosic substrate and a second cellulosic substrate together into opposing surface-to-surface relationship so that said molten polymer layer is sandwiched between and bonds together said first and second cellulosic substrates without substantially completely impregnating either of said cellulosic layers, said polymer layer defining a thickness which is greater than the thickness of either of said cellulosic layers;
- applying a release coating of a surface of at least one of said cellulosic substrates.
A method of making a release liner including cellulosic material exhibiting substantial dimensional stability upon exposure to changes in ambient moisture, the method comprising:
- providing a cellulosic substrate having a polymer coating on at least one surface thereof;
- extruding a molten polymer onto said polymer coated surface of said cellulosic substrate to form a molten polymer layer thereon;
- bringing said first cellulosic substrate and a second cellulosic substrate also having a polymer coating on a surface thereof together into opposing surface-to-surface relationship so that said molten polymer layer is sandwiched between said polymer coated surfaces of each of said cellulosic substrates and bonds together said first and second cellulosic substrates without substantially completely impregnating either of said cellulosic layers, said polymer coated layers and said extruded polymer layer defining a thickness which is greater than the thickness of either of said cellulosic layers;
- and
- applying a release coating of a surface of at least one of said cellulosic substrates.
Dependencies are inferred from the claim text.