Silica-calcium carbonate composite particles

Details Silica-calcium carbonate composite particles Silica-calcium carbonate composite particles

2006-06-13

2006-06-13

Halpern, Mark (Department: 1731)

Compositions: coating or plastic

Materials or ingredients

Pigment, filler, or aggregate compositions, e.g., stone,...

C162S181100, C162S181200, C162S181600, C423S430000, C423S432000

Reexamination Certificate

active

07060127

ABSTRACT:
Silica-calcium carbonate composition particles having the characteristics of both synthetic silica and calcium carbonate are described along with paper having the particles internally filled therein and a method for making the particles.In the carbonation reaction, which typically involves a step of forming calcium carbonate, while agitating a calcium hydroxide slurry, a mixed gas of carbon dioxide and air is introduced thereinto and synthetic silica, such as colloidal silica or the like, is added before the carbonation rate arrives at 95% but after commencement of the carbonation reaction, followed by further introduction of the mixed gas to continue the carbonation reaction and completion of the carbonation reaction at the time when the pH of the slurry reaches 7, thereby providing the composite particles.

REFERENCES:
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patent: 9-156923 (1997-06-01), None

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