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US 6,310,104 B1Granted
Process for producing colloidal borosilicates
AssigneeNalco Chemical Company
InventorsBruce A. Keiser, James E. Whitten
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Abstract
The invention comprises a borosilicate retention aid composition and a method for improving the production of paper by addition of the borosilicate. The borosilicate may be utilized in conjunction with a high molecular weight synthetic flocculant and/or starch, with or without the addition of a cationic coagulant. The borosilicate material is preferably a colloidal borosilicate. Methods for the preparation of the borosilicate material are disclosed.
Claims1
A method for the preparation of a colloidal borosilicate which comprises the steps of:
- a. contacting a dilute aqueous solution of an alkali metal silicate with a cation exchange resin to produce a silicic acid;
- b. forming a heel by mixing together a dilute aqueous solution of an alkali metal borate with an alkali metal hydroxide to form an aqueous solution containing 0.01 to 30 percent B2 O3, having a pH of from 7 to 10.5
- c. adding the silicic acid to the aqueous solution with agitation;
- and then,
- d. recovering an aqueous colloidal borosilicate.
2 more elements
Dependencies are inferred from the claim text.