Patent ID: 9725599
Date: 2017-08-08
CPC Classifications: B27N,C01P,C09C,D06M,D21C,D21H,Y10T

Claim:
1. An aqueous slurry comprising surface-mineralized organic fibers consisting of organic fibers coated at least partially with finely divided alkaline earth carbonate particles by means of a binder, wherein the organic fibers have a length in the millimeter range; 92 to 98% of the alkaline earth carbonate particles, based on the number N of the alkaline earth carbonate particles, have a spherical equivalent diameter of less than 200 nm; the binder is a copolymer comprising one or more dicarboxylic acids as a monomer; one or more monomers from the group of diamines, triamines, dialkanolamines or trialkanolamines; and epichlorohydrin, wherein the binder is optionally partially or completely neutralized by an anionic polymer; and wherein the organic fibers are present in an amount of 5 to 50 wt % based on the total dry weight of the organic fibers and the alkaline earth carbonate particles, the alkaline earth carbonate particles are present in an amount of 95 to 50 wt % based on the total dry weight of the organic fibers and alkaline earth carbonate particles, the binder is present in an amount of 0.3 to 10 wt % based on the total dry weight of the surface-mineralized organic fibers, the alkaline earth carbonate particles are natural ground calcium carbonate, precipitated calcium carbonate, a mixed carbonate, dolomite, or any mixture thereof, and wherein the alkaline earth carbonate particles are dispersed or milled in the presence of one or more milling aids and/or dispersants in an amount of 0.2 to 1 mg/m