Chemistry of inorganic compounds – Carbon or compound thereof – Oxygen containing
Patent
1988-06-07
1990-05-22
Straub, Gary P.
Chemistry of inorganic compounds
Carbon or compound thereof
Oxygen containing
423430, 106464, C01F 524, C01F 1118
Patent
active
049276182
ABSTRACT:
This invention concerns a process for the preparation of large surface area, finely divided precipitated calcium carbonate which comprises introducing carbon dioxide into an aqueous slurry of greater than about five weight percent calcium hydroxide containing an anionic organopolyphosphonate polyelectrolyte, starting the introduction at a temperature above about 7.degree. C. and below about 18.degree. C., continuing the introduction until calcite precipitation is substantially complete and adding a quantity of polybasic acid to the slurry in an amount greater than about 0.3% by weight of the precipitated calcium carbonate. This invention also concerns said large surface area, finely divided precipitated calcium carbonate which has been coated with a fatty acid derivative and polymeric compositions which contain such coated calcium carbonate.
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Hakuenka OT & Hakuenka TDD for Printing Ink, product literature of Shiraishi Calcium Kaisha, Ltd., Div. of Shiraishi Kogyo Kaisha, Ltd., No. 18, 2-Chome, Kitadohshin-Cho, Kita-ku, Osaka, Japan, Date unknown.
Mathur, K., et al., Coated Ultrafine Precipitated CaCO.sub.3 as Impact Modifier Extender in Low Molecular Weight PVC, Proceedings of the SPE 44th Annular Technical Conference and Exhibit, 1986.
Mathur Krishna K.
Resnik Robert K.
Simmons Randall G.
Benson Gregg C.
Lumb J. Trevor
Pfizer Inc.
Richardson Peter C.
Straub Gary P.
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