Aqueous dispersions of acicular titanium dioxide
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United States of America Patent
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-
Nov 26, 1991
Grant Date -
N/A
app pub date -
Dec 1, 1989
filing date -
Dec 16, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An aqueous dispersion of acicular fine particle size titanium dioxide containing from 20 to 60% by weight solids content and a polycarboxylic dispersant is of outstanding use in the preparation of sun screens. The dispersions are transparent to visible light and absorbant to UV light of broad spectrum. Usually the titanium dioxide has a largest dimension within the range 0.01 to 0.15 micron. The dispersions are produced by milling, preferably in a high speed mill, until the required UV absorbancy is attained.
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