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US 4,309,223 AGranted
Flushing process for pigments
AssigneeBASF Wyandotte Corporation
InventorsDale L. Rouwhorst, Ronald L. Jillson
Life of this patent
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AssigneeBASF Wyandotte Corporation
InventorsDale L. Rouwhorst, Ronald L. Jillson
Estimating the term…
This invention relates to a method for producing a pigment-organic vehicle product which comprises forcing an aqueous pulp of the pigment through a conduit and injecting the vehicle into the conduit and aqueous pulp. The mixture is then homogenized, subjected to further mixing and transferred to a traveling horizontal perforated surface whereby some of the water drains from the mixture through the perforations. The aqueous pulp, organic vehicle mixture is then forced through a cylindrical chamber having defined therein an axial opening of a diameter smaller than that of the chamber, and at least one second opening spaced from the axial opening. The mixture is forced through the chamber and axial opening by a rotating helical surface whereby the product is extruded through the axial opening and water is squeezed from the mixture. The water then exits from the chamber through the second opening.
A method of producing a pigment-hydrophobic organic vehicle product which comprises forcing an aqueous pigment-containing pulp-hydrophobic organic vehicle mixture having a proportion of pigment to vehicle up to about 1:1 through a cylindrical chamber having defined at one end thereof an axial opening of a diameter smaller than that of said chamber, and at least one second opening spaced from said axial opening, said mixture being forced through said chamber and said axial opening by a rotating helical surface whereby said product is forced through said axial opening, water is squeezed from said mixture and exits through said second opening.
Dependencies are inferred from the claim text.