US4095994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Soft-settling fluosilicate-treated silica flatting agent
Assignee: PPG Industries Inc
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Filing: 1977-01-07
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Granted: 1978-06-20
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Expires: 1997-01-07
Abstract
Abstract Finely divided, fluosilicate-treated silica, such as silica flatting agent for use in coating formulations, is prepared by blending in a dry, finely divided state, silica and divalent metal fluosilicate, notably magnesium fluosilicate. In a preferred embodiment, dry pellets of amorphous, precipitated silica and dry magnesium fluosilicate are milled together to produce the fluosilicate-treated flatting agent. In another embodiment, an aqueous solution of magnesium fluosilicate is applied to silica pellets which are then milled.
Inventors
- 👤 Roger A. Crawford
- 👤 Laurence E. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:12
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/309; C09C3/00; C09C3/04; C09C3/041; C09C3/045; C09C3/06; C09C3/063; C01; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/50; C01P2004/51; C01P2004/60; C01P2004/61; C01P2004/64; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/80; C01P2006/82
Claims Analysis
Total Claims: 40
Claim 1
Independent Claim
114 words
A method of preparing metal fluosilicate treated silica flatting agent which comprises: independently feeding pellets of amorphous, precipitated silica and divalent metal fluosilicate to a mill and blending the silica and the fluosilicate therein while in a dry, finely divided state; recovering from the mill dry, treated silica having a fluosilicate content, calculated as F, of between about 0.1 and 10 percent by weight of silica and having its particles in sizes useful for flatting agent; and aging said dry, fluosilicate-treated silica for a time sufficient to render the treated silica more soft settling than untreated silica in a coating formulation, said silica containing during such aging at least 1 weight percent adsorbed water.
Claim 2
Independent Claim
114 words
A method of preparing metal fluosilicate treated silica flatting agent which comprises: independently feeding pellets of amorphous, precipitated silica and divalent metal fluosilicate to a mill and blending the silica and the fluosilicate therein while in a dry, finely divided state; recovering from the mill dry, treated silica having a fluosilicate content, calculated as F, of between about 0.1 and 10 percent by weight of silica and having its particles in sizes useful for flatting agent; and aging said dry, fluosilicate-treated silica for a time sufficient to render the treated silica more soft settling than untreated silica in a coating formulation, said silica containing during such aging at least 1 weight percent adsorbed water.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein the metal fluosilicate is fed dry.
Claim 4
Dependent Claim
11 words
The method of claim 1, wherein the metal fluosilicate is wet.
Claim 5
Dependent Claim
13 words
The method of claim 1, wherein the mill is a fluid energy mill.
Claim 6
Dependent Claim
12 words
The method of claim 1, wherein the metal fluosilicate is magnesium fluosilicate.
Claim 7
Dependent Claim
12 words
The method of claim 1, wherein the metal fluosilicate is calcium fluosilicate.
Claim 8
Dependent Claim
12 words
The method of claim 1, wherein the metal fluosilicate is zinc fluosilicate.
Claim 9
Dependent Claim
21 words
The method of claim 1, wherein the dry, treated silica has between about 3 and 25 percent adsorbed water during aging.
Claim 10
Dependent Claim
18 words
The method of claim 1, wherein the dry, treated silica is aged for at least about 12 hours.
Claim 11
Independent Claim
67 words
A method of preparing metal fluosilicate-treated silica which comprises: intimately blending, while in a dry, finely divided state, silica and a divalent metal fluosilicate to produce dry, fluosilicate-treated silica having a fluosilicate content calculated as fluorine (F) of between about 0.1 and 10 percent by weight of silica, and aging said dry fluosilicate-treated silica for a time sufficient for the silica and the metal fluosilicate to interact.
Claim 12
Independent Claim
67 words
A method of preparing metal fluosilicate-treated silica which comprises: intimately blending, while in a dry, finely divided state, silica and a divalent metal fluosilicate to produce dry, fluosilicate-treated silica having a fluosilicate content calculated as fluorine (F) of between about 0.1 and 10 percent by weight of silica, and aging said dry fluosilicate-treated silica for a time sufficient for the silica and the metal fluosilicate to interact.
Claim 13
Dependent Claim
28 words
The method as recited in claim 10, wherein the step of intimately blending comprises the step of milling together said dry, finely divided silica and divalent metal fluosilicate.
Claim 14
Dependent Claim
32 words
The method as recited in claim 10, wherein said divalent metal fluosilicate is wetted with water, and said water being in an amount sufficient so that the silica remains dry during blending.
Claim 15
Dependent Claim
18 words
The method as recited in claim 10, wherein said divalent metal fluosilicate is in a substantially dry state.
Claim 16
Dependent Claim
18 words
The method as recited in claim 11, wherein said divalent metal fluosilicate is in a substantially dry state.
Claim 17
Dependent Claim
19 words
The method as recited in claim 14, wherein the step of milling is performed in a fluid energy mill.
Claim 18
Dependent Claim
15 words
The method as recited in claim 15, wherein the silica is an amorphous, precipitated silica.
Claim 19
Dependent Claim
14 words
The method as recited in claim 16, wherein the metal fluosilicate is magnesium fluosilicate.
Claim 20
Dependent Claim
14 words
The method as recited in claim 16, wherein the metal fluosilicate is calcium fluosilicate.
Claim 21
Dependent Claim
14 words
The method as recited in claim 16, wherein the metal fluosilicate is zinc fluosilicate.
Claim 22
Dependent Claim
14 words
The method as recited in claim 10, wherein the metal fluosilicate is magnesium fluosilicate
Claim 23
Dependent Claim
14 words
The method as recited in claim 10, wherein the metal fluosilicate is calcium fluosilicate.
Claim 24
Dependent Claim
14 words
The method as recited in claim 10, wherein the metal fluosilicate is zinc fluosilicate.
Claim 25
Dependent Claim
19 words
The method as recited in claim 17, wherein the silica has from about 1 to 25 percent adsorbed water.
Claim 26
Dependent Claim
19 words
The method as recited in claim 18, wherein the silica has from about 1 to 25 percent adsorbed water.
Claim 27
Dependent Claim
19 words
The method as recited in claim 19, wherein the silica has from about 1 to 25 percent adsorbed water.
Claim 28
Dependent Claim
14 words
The method as recited in claim 12, wherein silica is an amorphous, precipitated silica.
Claim 29
Dependent Claim
15 words
The method as recited in claim 26, wherein the divalent metal fluosilicate is magnesium fluosilicate.
Claim 30
Dependent Claim
15 words
The method as recited in claim 26, wherein the divalent metal fluosilicate is calcium fluosilicate.
Claim 31
Dependent Claim
15 words
The method as recited in claim 16, wherein the divalent metal fluosilicate is zinc fluosilicate.
Claim 32
Dependent Claim
15 words
The method as recited in claim 13, wherein the silica is an amorphous, precipitated silica.
Claim 33
Dependent Claim
15 words
The method as recited in claim 30, wherein the divalent metal fluosilicate is magnesium fluosilicate.
Claim 34
Dependent Claim
15 words
The method as recited in claim 30, wherein the divalent metal fluosilicate is calcium fluosilicate.
Claim 35
Dependent Claim
15 words
The method as recited in claim 30, wherein the divalent metal fluosilicate is zinc fluosilicate.
Claim 36
Dependent Claim
19 words
The method as recited in claim 31, wherein the silica has from about 1 to 25 percent adsorbed water.
Claim 37
Dependent Claim
19 words
The method as recited in claim 32, wherein the silica has from about 1 to 25 percent adsorbed water.
Claim 38
Dependent Claim
19 words
The method as recited in claim 33, wherein the silica has from about 1 to 25 percent adsorbed water.
Claim 39
Dependent Claim
116 words
An improved granular composition comprised of particles of amorphous, hydrated-precipitated silica flatting agents, said particles having an ultimate particle size of between about 0.01 and 0.05 microns, and agglomerates with a weight median agglomerate size of from about 2 to 12 microns, and a distribution size range of from 2 to 40 microns, a B.E.T. surface area of from 100 to 300 square meters per gram, in which the improvement comprises said particles having deposited on their surface from about 0.1 to 10 weight percent per weight of silica free of adsorbed water based on weight of fluorine, of a metal fluosilicate selected from the group consisting of calcium fluosilicate and zinc fluosilicate or mixtures thereof.
Claim 40
Dependent Claim
116 words
An improved granular composition comprised of particles of amorphous, hydrated-precipitated silica flatting agents, said particles having an ultimate particle size of between about 0.01 and 0.05 microns, and agglomerates with a weight median agglomerate size of from about 2 to 12 microns, and a distribution size range of from 2 to 40 microns, a B.E.T. surface area of from 100 to 300 square meters per gram, in which the improvement comprises said particles having deposited on their surface from about 0.1 to 10 weight percent per weight of silica free of adsorbed water based on weight of fluorine, of a metal fluosilicate selected from the group consisting of calcium fluosilicate and zinc fluosilicate or mixtures thereof.
References Cited (Backward Citations)
US2625492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |