Compound of calcium carbonate and of tobermorites, its manufacture and its applications
First Claim
1. A composition of calcium carbonate and hydrated tobermorites, consisting of from about 70 to about 15 per cent by weight of tobermorites, which may contain an amount from 0 to 15 per cent by weight of free hydrated silica expressed as SiO2, and of from about 30 to about 85 per cent by weight of calcium carbonate.
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Accused Products
Abstract
A compound of calcium carbonate and of hydrated tobermorites, constituted of 70 to 15% tobermorites, which may contain free hydrated silica in amounts to 0 to 15% in weight expressed in SiO2, and of 30 to 85% calcium carbonate. The process includes completely hydrating white Portland cements between about 5 and 100° C to form a paste having a dry extract of 5 to 70% by weight until at least a decrease in the pH-value occurs.
The compound is an industrial charge particularly for paper-making and paint-making industries.
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Citations
9 Claims
- 1. A composition of calcium carbonate and hydrated tobermorites, consisting of from about 70 to about 15 per cent by weight of tobermorites, which may contain an amount from 0 to 15 per cent by weight of free hydrated silica expressed as SiO2, and of from about 30 to about 85 per cent by weight of calcium carbonate.
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4. In a process for preparing a composition of calcium carbonate and tobermorites, the improvement in combination therewith comprising the steps of:
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hydrating a white Portland cement at a temperature from about 5°
to about 100°
C with water and agitation to form a paste including lime and having a dry extract of from about 5 to 70 per cent by weight; andcarbonating said paste at least until all of said lime has been chemically changed into calcium carbonate, whereby a decrease of the pH-value of said paste occurs. - View Dependent Claims (5, 6, 7)
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8. In the preparation of a paint, the improvement in combination therewith comprising the steps of:
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hydrating a white Portland cement at a temperature from about 5°
to about 100°
C with water and agitation to form a paste including lime and having a dry extract of from about 5 to about 70 per cent by weight;carbonating said paste at least until all of said lime has been chemically changed into calcium carbonate, whereby a decrease of the pH-value of said paste occurs; and
adding the carbonated paste to the paint.
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9. In the preparation of a coating for paper, the improvement in combination therewith comprising:
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hydrating a white Portland cement at a temperature from about 5°
to about 100°
C with water and agitation to form a paste including lime and having a dry extract of from about 5 to about 70 per cent by weight;carbonating said paste at least until said lime has been chemically changed into calcium carbonate, whereby a decrease of the pH-value of said paste occurs; and applying the carbonated paste to the surface of the paper.
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Specification