Vesiculated polymer granules and paper made therefrom
AssigneeICI Canada Inc.
InventorLoreen D. Ferguson
Life of this patent
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Abstract
An alkaline paper comprising polymeric vesiculated granules, calcium carbonate, and fibrous materials. Alkaline papers made according to the present invention have improved physical properties.
Claims7
An alkaline paper comprising a fibrous cellulosic material, 1.0 to 10.0% by weight of polymeric vesiculated granules, and 5 to 35% precipitated calcium carbonate filler, said granules having a mean diameter of 1 to 100 microns, the ratio of the granule to the mean vesicle diameter being at least 5:1, the maximum diameter of the vesicles being 20 microns, and the volume of the vesicles being from 5 to 95% of the volume of the granule.
A method of improving the physical properties of an alkaline paper comprising:
- preparing an aqueous mixture of a fibrous cellulosic material and 5 to 35%, by weight on solids of cellulosic material, of a precipitated calcium carbonate filler;
- and
- removing water from said mixture, to form an alkaline paper wherein the improvement comprises adding 1 to 10%, by weight on solids of cellulosic material, of polymeric vesiculated granules, said granules having a mean diameter of 1 to 100 microns, the ratio of the granule to the mean vesicle diameter being at least 5:1, the maximum diameter of the vesicles being 20 microns, and the volume of the vesicles being from 5 to 95% of the volume of the granule.
Dependencies are inferred from the claim text.