Process for the preparation of large surface area, finely divide

Details Process for the preparation of large surface area, finely divide Process for the preparation of large surface area, finely divide

1990-03-08

1990-12-25

Jacobs, Lewis T.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524425, C08K 326

Patent

active

049803956

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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Mathur, K. et al., Coated Ultrafine Precipitated CaCO.sub.3 as Impact Modifier Extender in Low Molecular Weight PVC, Proceedings of the SPE 44th Annual Technical Conference and Exhibit, 1986.
Soviet Inventions Illustrated, Week 84, Jun. 13, 1984, Abstract No. 84-111935 (SU-A-1040387).
Patent Abstracts of Japan, vol. 9, No. 247 (C-307), [1970], Oct. 3, 1985 (JP-A-60103025).
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.

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