Patent US4129854A successfully refreshed from Google Patents.
US3661610A
Expired / Lapsed
US
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Pigment
Assignee: Imerys Minerals Ltd
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Filing: 1970-09-08
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Granted: 1972-05-09
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Expires: 1990-09-08
Abstract
Abstract A mixed clay/calcium carbonate pigment wherein the clay pigment component has associated therewith before being mixed with the calcium carbonate pigment component a water-soluble condensed phosphate dispersing agent and a second dispersing agent which is a water-soluble salt comprising an organic macromolecular anion, for example a salt of polyacrylic or polymethacrylic acid, and wherein the calcium carbonate pigment component has associated therewith before being mixed with the clay pigment component said second dispersing agent.
Inventors
- 👤 Andrew Paul Ferris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:59
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/40; C09C1/42; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/22; C01P2006/60
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
29 words
A mixed pigment as claimed in claim 1, wherein said calcium carbonate pigment component also has associated therewith in the unmixed condition a quantity of said first dispersing agent.
Claim 2
Dependent Claim
27 words
A mixed pigment as claimed in claim 1 wherein said first dispersing agent is selected from the group consisting of tetrasodium pyrophosphate, sodium hexametaphosphate and sodium tripolyphosphate.
Claim 3
Dependent Claim
34 words
A mixed pigment as claimed in claim 1, wherein said second dispersing agent is a water-soluble salt having a polymeric anion with a number average molecular weight in the range 100 to 10, 000.
Claim 4
Dependent Claim
42 words
A mixed pigment as claimed in claim 4, wherein said second dispersing agent is selected from the group consisting of the sodium, potassium and ammonium salt of an acid selected from the group consisting of a polyacrylic acid and a polymethacrylic acid.
Claim 5
Dependent Claim
42 words
A mixed pigment as claimed in claim 1, wherein the amount of said first dispensing agent associated with the clay pigment component is in the range of from 0.1 to 0.5 percent by weight based on the weight of dry clay pigment.
Claim 6
Dependent Claim
42 words
A mixed pigment as claimed in claim 1, wHerein the amount of said second dispersing agent associated with the clay pigment component is in the range of from 0.1 to 0.30 percent by weight based on the weight of dry clay pigment.
Claim 7
Dependent Claim
43 words
A mixed pigment as claimed in claim 1, wherein the amount of said second dispersing agent associated with the calcium carbonate pigment component is in the range of from 0.01 to 0.30 percent by weight based on the weight of dry calcium carbonate.
Claim 8
Dependent Claim
23 words
A mixed pigment as claimed in claim 1, wherein the calcium carbonate pigment component consists substantially completely of particles smaller than 53 microns.
Claim 9
Dependent Claim
17 words
A mixed pigment as claimed in claim 1, wherein the clay pigment component is a kaolinitic clay.
Claim 10
Dependent Claim
71 words
A mixed pigment as claimed in claim 10, wherein said clay pigment component has a particle size distribution such that at least 50 percent by weight thereof consists of particles smaller than 2 microns equivalent spherical diameter, not more than 15 percent by weight thereof consists of particles larger than 10 microns equivalent spherical diameter, and not more than 0.05 percent by weight thereof consists of particles larger than 53 microns.
Claim 11
Independent Claim
106 words
A method of preparing a mixed pigment consisting essentially of a clay pigment component and a calcium carbonate pigment component said method comprising the steps of (a) forming an aqueous suspension of the clay pigment component containing a quantity of a first dispersing agent which is a water-soluble condensed phosphate and a quantity of a second dispersing agent which is a water-soluble salt comprising an organic macromolecular anion, (b) forming an aqueous suspension of the calcium carbonate pigment component containing a quantity of said second dispersing agent, and (c) blending together the aqueous suspension of the clay pigment component and of the calcium carbonate pigment component.
Claim 12
Dependent Claim
49 words
A method according to claim 12, wherein the solids contents of said aqueous suspension of a clay pigment component and said aqueous suspension of a calcium carbonate pigment component are such that the blended aqueous suspension has a solids content in the range 60 to 80 percent by weight.
Claim 13
Dependent Claim
33 words
A method according to claim 12, wherein after the aqueous suspensions of the clay pigment component and of the calcium carbonate pigment component have been blended together the resulting blending suspension is spray-dried.
Claim 14
Dependent Claim
30 words
A method according to claim 12, wherein said calcium carbonate pigment component has associated therewith before being mixed with said clay pigment component a quantity of said first dispersing agent.
Claim 15
Dependent Claim
15 words
A method according to claim 12, wherein the clay pigment component is a kaolinitic clay.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |