초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of preparing an aqueous talc slurry consisting essentially of the steps of:a) making a mixture of carboxymethyl cellulose wetting agent and water;b) adjusting the pH of the mixture to between 9 and 11;c) adding a dispersing agent to the mixture; andd) dispersin

[ What is claimed is:] [1.]1. A method of preparing an aqueous talc slurry consisting essentially of the steps of:a) making a mixture of carboxymethyl cellulose wetting agent and water;b) adjusting the pH of the mixture to between 9 and 11;c) adding a dispersing agent to the mixture; andd) dispersing talc pigment in the mixture to form a slurry; the slurry having an entrained air content of less than 4% as measured after at least 30 minutes of mixing a low shear, and the slurry having solids content of at least about 58% solids.