Anhydrous kaolin clay pigment and method of preparation

Compositions: coating or plastic – Materials or ingredients

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Details

501145, C09C 142, C08H 1706

Patent

active

043819486

ABSTRACT:
An anhydrous white kaolin clay pigment is disclosed, which consists of porous aggregates of kaolin clay platelets. The pigment exhibits exceptionally high light-scattering ability when incorporated as a filler in paper. The aggregates have an average specific gravity in the range of 0.5 to 0.6, and a size distribution such that not more than 5% by weight thereof are of greater than 10 microns ESD, at least 75% are of less than 2 microns ESD, and not more than 15% are of less than 1 micron ESD. The pigment has a Valley abrasion value below 30 mg, and preferably below 20 mg, and a GE brightness of at least 93. The mean size of the internal pores in the aggregates is less than 0.55 microns and preferably is less than 0.5 microns. This low mean pore size is deemed instrumental in producing the aforementioned high scattering ability. A method for producing the said pigment is also disclosed and claimed.

REFERENCES:
patent: 3014836 (1961-12-01), Proctor
patent: 3171718 (1965-03-01), Gunn et al.
patent: 3519453 (1970-07-01), Morris et al.
patent: 3586523 (1971-06-01), Fanselow et al.
patent: 3798044 (1974-03-01), Whitley et al.

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