Inventors:
Dale L. Rouwhorst - Holland MI
Ronald L. Jillson - Midland MI
Assignee:
BASF Wyandotte Corporation - Wyandotte MI
International Classification:
C09C 310
C09D 1700
Abstract:
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.