D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
9/46
D21H 23/76 (2006.01) D21H 17/35 (2006.01) D21H 17/43 (2006.01) D21H 17/67 (2006.01)
Patent
CA 1112006
ABSTRACT A sheet which is a composite of (A) from about 1 percent to about 30 percent of a water-dispersible fiber such as wood fiber, (B) from about 2 percent to about 30 percent of a film-forming, water-insoluble, organic poly- mer such as a copolymer of styrene and butadiene and (C) from about 60 percent to about 95 percent of a finely- -divided, substantially water-insoluble, non-fibrous, inorganic filler such as magnesium hydroxide is prepared by steps comprising: (I) providing an aqueous dispersion of the fiber; (II) mixing therewith (A) the inorganic filler and (B) the organic polymer in the form of an ionically stabilized latex; (III) colloidally destabilizing the resulting mixture to form a fibrous agglomerate in aqueous sus- pension; (IV) distributing and draining the aqueous dispersion on a porous substrate such as a wire to form a wet web; and (V) drying the web.
318286
Smart & Biggar
The Dow Chemical Company
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