High opacity paper containing expanded fiber and mineral pigment
AssigneeThe Procter & Gamble Cellulose Company
InventorsPaul E. Gregory, Kenneth D. Vinson
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Abstract
A paper structure having both high opacity and improved tensile strength through the incorporation of expanded fiber and an opacifying mineral pigment, such as titanium dioxide, is disclosed. The addition of expanded fiber to the paper structure makes it possible to increase the opacity of the paper through the use of the conventional mineral pigments without adversely affecting the paper's tensile strength. These opacified paper structures are especially useful for producing high quality, strong, light weight printing and writing papers which require material pigments for enhanced opacity.
Claims11
An opacified paper structure comprising cellulosic fibers, from about 1% to about 25% expanded cellulosic fibers, based on the dry weight of said opacified paper structure, and an effective amount of an opacifying mineral pigment, said paper having a basis weight from about 20 to about 120 grams per square meter, and a density of about 1.0 grams or less per cubic centimeter.
Dependencies are inferred from the claim text.