CA2163569A1 - Rhombohedral Calcium Carbonate and Accelerated Heat-Aging Process for the Production Thereof - Google Patents
Rhombohedral Calcium Carbonate and Accelerated Heat-Aging Process for the Production ThereofInfo
- Publication number
- CA2163569A1 CA2163569A1 CA 2163569 CA2163569A CA2163569A1 CA 2163569 A1 CA2163569 A1 CA 2163569A1 CA 2163569 CA2163569 CA 2163569 CA 2163569 A CA2163569 A CA 2163569A CA 2163569 A1 CA2163569 A1 CA 2163569A1
- Authority
- CA
- Canada
- Prior art keywords
- calcium carbonate
- papermaking
- aging process
- accelerated heat
- production
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 title abstract 8
- 229910000019 calcium carbonate Inorganic materials 0.000 title abstract 4
- 238000000034 method Methods 0.000 title abstract 4
- 239000002245 particle Substances 0.000 abstract 5
- 239000013078 crystal Substances 0.000 abstract 2
- 239000000463 material Substances 0.000 abstract 2
- 239000000945 filler Substances 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 abstract 1
Landscapes
- Paper (AREA)
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
A form of calcium carbonate having a blocky-six-sided rhombohedral final crystal morphology, with a surface area of from about 3 to about 15 m2/g, an average discrete particle size of from about 0.2 to about 0.9 microns, wherein the discrete particles have an aspect ratio less than 2, and a particle size distribution such that at least about 60 weight percent of the particle lies within 50 percent of the equivalent discrete particle sherical diameter, suitable for use as a filler material in papermaking to improve the optical properties of the resulting paper, is disclosed. An accelerated heat-aging process, including embodiment thereof which utilize hydrothermal techniques, for rapidly producing this form of calcium carbonate and a related form of calcium carbonate having a prismatic final crystal morphology in large quantities to meet the demand of the papermaking industry, as well as a method for using these materials in papermaking are also disclosed.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/493,075 | 1990-03-13 | ||
| US07/493,075 US5269818A (en) | 1990-03-13 | 1990-03-13 | Rhombohedral calcium carbonate and accelerated heat-aging process for the production thereof |
| CA002038009A CA2038009C (en) | 1990-03-13 | 1991-03-11 | Rhombohedral calcium carbonate and accelerated heat-aging process for the production therof |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002038009A Division CA2038009C (en) | 1990-03-13 | 1991-03-11 | Rhombohedral calcium carbonate and accelerated heat-aging process for the production therof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2163569A1 true CA2163569A1 (en) | 1991-09-14 |
| CA2163569C CA2163569C (en) | 1997-12-09 |
Family
ID=25674508
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002163569A Expired - Fee Related CA2163569C (en) | 1990-03-13 | 1991-03-11 | Rhombohedral calcium carbonate and accelerated heat-aging process for the production thereof |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2163569C (en) |
-
1991
- 1991-03-11 CA CA002163569A patent/CA2163569C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2163569C (en) | 1997-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |