Process for extruding and acid treating clay for improved color

Details Process for extruding and acid treating clay for improved color Process for extruding and acid treating clay for improved color

1988-02-29

1989-05-23

Chin, Peter

Paper making and fiber liberation

Processes and products

Non-fiber additive

D21H 366

Patent

active

048327930

ABSTRACT:
A method of extruding clay and then treating the clay with acid to beneficiate the clay for increased color development potential when included in carbonless copy paper. The clay is first extruded through one or more die openings to align some of the clay platelets and to form the clay into cylindrical pellets. The extruded clay pellets then are acid treated, either before or after grinding, in an aqueous acid solution to form an acid slurry of the clay. The acid slurry of the clay is agitated for a time sufficient and at a temperature sufficient so that the acid reacts with a portion of the clay and, thereafter, the acid treated clay is separated from the acid solution; the clay then is washed to remove most of the acid solution from the clay; filtered and thereafter dried.

REFERENCES:
patent: 4125411 (1978-11-01), Lyons
patent: 4451440 (1984-05-01), Thompson

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