Paper making and fiber liberation – Processes and products – With coating after drying
Patent
1991-10-07
1992-06-30
Chin, Peter
Paper making and fiber liberation
Processes and products
With coating after drying
1621811, 1621812, D21H 1936
Patent
active
051260115
ABSTRACT:
A process for the preparation of high purity calcium titanate hydrates, particularly various forms of kassite, is disclosed. Calcium carbonate and titanium tetraisopropoxide are used as starting materials. The process utilizes a hydrothermal reaction step. Hydrates having both hexagonal form, wherein the particles have a platy morphology, and lath form, wherein the particles have a rodlike morphology are produceable according to the process. Particle morphology is determined by the choice of process parameters, especially the rate of heating during the hydrothermal reaction step. Kassite particles of the hexagonal plate form, which are useful as a high opacity paper coating pigment, are produced when the rate of heating is less than or equal to 1.5.degree.C./min. Faster rates of heating result in kassite particles of a lath form. These particles are useful as a reinforcing material in polymers and ceramics.
REFERENCES:
patent: 1436164 (1922-11-01), Goldschmidt
patent: 2166221 (1939-07-01), Patterson
patent: 3484260 (1969-12-01), Emslie et al.
patent: 4173485 (1979-11-01), Woditsch et al.
Damiano John
Griffin Richard C.
Akers Lawrence C.
Chin Peter
Jaeger Howard R.
Pfizer Inc.
Richardson Peter C.
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