UV stabilization of synthetic paper
AssigneeKimberly-Clark Worldwide, Inc.
InventorsSteven R. Stopper, Charles Edward Edmundson
Life of this patent
Estimating the term…
Abstract
There is provided a synthetic paper for use in outside applications. The paper has good UV stability and may be constructed one, two or more layers. A three layer embodiment has; a core or inner layer and two skin or outer layers. The layers are made with a polyolefin, a filler, a titanium dioxide, a hindered amine and other additives.
Claims16
1) A synthetic paper comprising three layers;
- a core layer and, on either side of said core layer, a skin layer, wherein;
- the core layer is made from about 50 to about 90 weight percent polypropylene, about 15 to 50 weight percent calcium carbonate, about 0.25 to 10 weight percent TiO2, about 0.25 to 10 weight percent hindered amine, and about 0.1 to 10 weight percent of a phosphite and a hindered phenol, collectively, and,
- the skin layer is made from about 35 to 85 weight percent of polypropylene, about 15 to 50 weight percent calcium carbonate, about 0.25 to 10 weight percent TiO2, about 0.25 to 10 weight percent hindered amine, and about 0.1 to 0.5 weight percent of a phosphite and a hindered phenol, collectively.
9) A synthetic paper comprising three layers;
- a core layer contributing about 90 weight percent of said paper and, on either side of said core layer, a skin layer, each skin layer contributing about 5 weight percent of said paper, wherein;
- the core layer is made from about 65 to about 85 weight percent polypropylene, about 20 to 30 weight percent calcium carbonate, about 2 to 7 weight percent TiO2, about 0.25 to 1 weight percent hindered amine, and about 0.1 to 0.5 weight percent of a phosphite and a hindered phenol, collectively, and,
- the skin layer is made from about 40 to 70 weight percent of polypropylene, about 20 to 30 weight percent calcium carbonate, about 2 to 7 weight percent TiO2, about 0.25 to 1 weight percent hindered amine, and about 0.1 to 0.5 weight percent of a phosphite and a hindered phenol, collectively.
12) A synthetic paper comprising one layer, said layer made from between about 45 and 80 weight percent of a polyolefin, calcium carbonate in an amount of about between about 15 and 50 weight percent, titanium dioxide in an amount between about 0.25 and 10 weight percent and a hindered amine light stabilizing material present at an amount of about between about 0.25 and 10 weight percent.
Dependencies are inferred from the claim text.