The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 31, 2001
Filed:
Dec. 21, 1998
Suresh B. Cherukuri, Wisconsin Rapids, WI (US);
Stora Enso North America Corp., Wisconsin Rapids, WI (US);
Abstract
An aqueous talc slurry that exhibits minimal foaming comprises talc pigment, a carboxymethyl cellulose (CMC) wetting agent having a molecular weight of between 50,000 and 150,000, an ionic polyacrylate dispersing agent, and has a solids content of between 55% and 65%. The slurry has an entrained air content of less than about 1% as measured after at least several minutes of low shear agitation. A method of preparing a talc slurry that exhibits minimal foaming comprises the sequential steps of mixing CMC wetting agent with water, adding an ionic polyacrylate dispersing agent, and dispersing talc to result in a solids content of between 55% and 65%. The resultant slurry has an entrained air content of less than 1% as measured after at least 30 minutes of low shear mixing. An aqueous talc slurry containing a small amount of xanthan gum stabilizing agent is stable for prolonged periods.