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US4353751A
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Method to produce mineral fillers containing hydrated calcium monocarboaluminate
Assignee: Lafarge SA
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Filing: 1980-11-26
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Granted: 1982-10-12
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Expires: 2000-11-26
Abstract
Abstract A method of producing mineral fillers containing hydrated calcium monocarboaluminate. Al(OH)3, CaCO3 and Ca(OH)2 are reacted together in the presence of water, the operating temperature range being of 50 DEG C.-100 DEG C. Although these materials are insoluble, a quick reaction occurs as well in a highly concentrated solid medium as in a diluted medium. According to a preferred embodiment, the amount of water is such to obtain a final dry matter content of 50%, and the substantially solid resulting paste is directly brought to the fluidity required for use by means of a defloculating agent. Application to paper coating.
Inventors
- 👤 Jacques Baudouin
- 👤 Jean-Pierre Caspar
- 👤 Jacques Gaillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:45
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/38; D21H19/385; C; C01; C01F; C01F7/00; C01F7/78; C01F7/784; C01F7/785; D21H21/00; D21H21/50; D21H21/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
A method for producing mineral fillers containing hydrated calcium monocarboaluminate, said process comprising reacting aluminum hydroxide under crystallized form, calcium oxide or calcium hydroxide and a normal carbonate CaCO 3 and/or a double calcium magnesium carbonate, in the presence of water, the operating temperature being higher than 50° C.
Claim 2
Independent Claim
49 words
A method for producing mineral fillers containing hydrated calcium monocarboaluminate, said process comprising reacting aluminum hydroxide under crystallized form, calcium oxide or calcium hydroxide and a normal carbonate CaCO 3 and/or a double calcium magnesium carbonate, in the presence of water, the operating temperature being higher than 50° C.
Claim 3
Dependent Claim
20 words
A method as claimed in claim 1, wherein the operating temperature is in the range of 50° to 100° C.
Claim 4
Dependent Claim
15 words
A method according to claim 2, wherein the operating temperature is higher than 70° C.
Claim 5
Dependent Claim
35 words
A method according to claim 1, wherein the following molar ratios are used: Ca(OH) 2 /Al(OH) 3 at most of 1.5 and Ca(OH) 2 /CaCO 3 or Ca(OH) 2 /(Ca,Mg)CO 3 at most of 3.
Claim 6
Dependent Claim
17 words
A method according to claim 4, wherein the Ca(OH) 2 /Al(OH) 3 ratio is higher than 1.2.
Claim 7
Dependent Claim
17 words
A method according to claim 4, wherein the Ca(OH) 2 /CaCO 3 ratio is higher than 1.
Claim 8
Dependent Claim
17 words
A method according to claim 5, wherein the Ca(OH) 2 /CaCO 3 ratio is higher than 1.
Claim 9
Dependent Claim
26 words
A method according to claim 1, wherein the amount of water added is selected to obtain a final product containing 15-35% by weight of solid matter.
Claim 10
Dependent Claim
47 words
A method according to claim 1, wherein the amount of water added is selected to obtain a final product containing 35-70% weight of solid matter, and in that a deflocculating agent is added in sufficient amount to obtain such fluidity as is suitable for the intented purpose.
Claim 11
Dependent Claim
27 words
A method according to claim 8, wherein the deflocculating agent addition to reach the required viscosity is only effected after complete removal of the hydrated calcium oxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-11 | 1986-04-12 | 1986-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-11 | 1990-04-12 | 1990-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-11 | 1994-04-12 | 1994-10-12 | $7700.00 | Window Closed / Lapsed |