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US 7,422,999 B2Granted
Overbased vaterite containing salt composition
AssigneeThe Lubrizol Corporation
InventorsVirginia A. Carrick, James P. Roski, Daniel E. Barrer
Life of this patent
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Abstract
This invention relates to an overbased vaterite containing composition, comprising: a disperse medium, and a calcium salt and calcium carbonate dispersed in the disperse medium, at least about 50% by weight of the calcium carbonate being in the form of vaterite, the composition being substantially haze free.
Claims18
An overbased vaterite containing salt composition, comprising:
- a disperse medium, and a calcium salt and calcium carbonate dispersed in the disperse medium, at least about 50% by weight of the calcium carbonate being in the form of vaterite, the composition being substantially haze free.
A process for making an overbased vaterite containing salt composition. comprising:
- (i) mixing an overbased amorphous calcium carbonate containing salt composition with water and an alcoholic mixture comprising at least one lower alcohol and at least one midlevel alcohol;
- and (ii) contacting the resulting mixture with an acidic material comprising CO2 until at least about 50% by weight of the amornhous calcium carbonate is converted to vaterite;
- wherein the weight ratio of water to alcohol is in the range from about 1:10 to about 1:30.
A process for making an overbased vaterite containing salt composition, comprising:
- (i) mixing an overbased amorphous calcium carbonate containing salt composition with water and an alcoholic mixture comprising methanol, isobutyl alcohol and amyl alcohol;
- and (ii) contacting the resulting mixture with CO2 at a temperature in the range from about 45° C. to about 80° C. until at least about 50% by weight of the amorphous calcium carbonate is converted to vaterite, the overbased amorphous calcium carbonate containing salt composition containing a remaining amount of calcium oxide and/or calcium hydroxide at the start of step (ii) and the amount of CO2 used in step (ii) being in excess on a molar basis of the remaining amount of calcium oxide and/or calcium hydroxide in the overbased amorphous calcium carbonate containing salt composition at the start of step (ii) as determined by DBN.
Dependencies are inferred from the claim text.