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US 6,193,844 B1Granted
Method for making paper using microparticles
OwnerJohn R. McLaughlin, Paul G. Linseninventors
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Abstract
A microparticle composition for paper making includes finely divided particles of a water insoluble solid such as amorphous sodium aluminosilicate, and having an anionic charge of at least 20 millivolts, and preferably from about 40 to 60 millivolts, and a particle size of less than about 0.1 microns.
Claims5
A process for making paper from an alkaline furnish, the process comprising:
- a) adding a cationic starch to the furnish;
- b) adding a cationic polyelectrolyte flocculant to the furnish;
- and
- c) adding to the furnish a microparticle composition comprising finely divided particles of a water insoluble, solid compound selected from the group consisting of amorphous alumino silicates, mixed crystalline/amorphous aluminosilicates, and diatomaceous earth, the solid compound having an anionic charge of at least 20 millivolts and a particle size of no greater than about 0.1 micron, a fluid vehicle, and a dispersion agent selected from the group consisting of wetting agents and anionic surfactants.
1 more element
Dependencies are inferred from the claim text.