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Document Number
US Patent 6267811
Issued Date
July 31, 2001
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Inventors
Cherukuri; Suresh B. (Wisconsin Rapids, WI)
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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.
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Number of Claims:
20
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Owner
Stora Enso North America Corp. (Wisconsin Rapids, WI)
Published
July 31, 2001
Application Number
09/217,489
Filed
December 21, 1998
US Classification
106/469   106/401 106/461 106/466
Int'l Classification
C09D   17/00   (20060101)  
Examiner
Assistant Examiner
Attorney/Law Firm
USPTO Field of Search
106/469   106/466   106/461   106/401  
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