Patent US4192691A successfully refreshed from Google Patents.
US4192691A
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Metal oxide platelets as nacreous pigments
Assignee: Mearl Corp
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Filing: 1978-10-26
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Granted: 1980-03-11
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Expires: 1998-10-26
Abstract
Abstract Unsupported metal oxide platey nacreous pigments are derived from metal oxide coated mica by a unique dissolution process and show higher luster and coverage than the pigment from which they are derived. If the metal oxide coated mica shows a reflection interference color, the unsupported product derived from it shows higher luster and greater reflection color intensity.
Inventors
- 👤 Louis Armanini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:49
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0021; C09C1/0018; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/60; C09C2200/00; C09C2200/10; C09C2200/102; C09C2200/30; C09C2200/301; C09C2200/308; C09C2220/00; C09C2220/10; Y; Y10; Y10S; Y10S106/00; Y10S106/03; Y10T; Y10T428/00; Y10T428/29; Y10T428/2911; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
69 words
A method for the preparation of a nacreous pigment which comprises the step of subjecting a non-toxic metal oxide coated mica nacreous pigment to an extractive dissolution by contacting said pigment with an aqueous acidic solution comprising hydrofluoric acid together with a mineral acid at an elevated temperature until the desired amount of mica has been removed and the luster has thereby been increased, and recovering the resulting pigment.
Claim 2
Independent Claim
69 words
A method for the preparation of a nacreous pigment which comprises the step of subjecting a non-toxic metal oxide coated mica nacreous pigment to an extractive dissolution by contacting said pigment with an aqueous acidic solution comprising hydrofluoric acid together with a mineral acid at an elevated temperature until the desired amount of mica has been removed and the luster has thereby been increased, and recovering the resulting pigment.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein said mineral acid is sulfuric acid.
Claim 4
Dependent Claim
45 words
The method of claim 1 wherein the metal oxide coated mica nacreous pigment in the aqueous acid is in a concentration of about 1-20%, the hydrofluoric acid is at a concentration of about 1-20% and the mineral acid is at a concentration of about 2-30%.
Claim 5
Dependent Claim
32 words
The method of claim 3 wherein the metal oxide coated mica nacreous pigment concentration is about 2-10%, the hydrofluoric acid concentration is about 4-10% and the mineral acid concentration is about 5-20%.
Claim 6
Dependent Claim
17 words
The method of claim 1 wherein said contacting is effected at a temperature of about 30°-100° C.
Claim 7
Dependent Claim
12 words
The method of claim 5 wherein said temperature is about 50°-80° C.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein said metal oxide coated mica nacreous pigment is a titanium dioxide coated mica nacreous pigment.
Claim 9
Dependent Claim
15 words
The method of claim 7 wherein said titanium dioxide is in the rutile crystalline form.
Claim 10
Dependent Claim
22 words
A non-toxic metal oxide coated mica nacreous pigment in which at least about half of the mica has been removed by dissolution.
Claim 11
Dependent Claim
22 words
A non-toxic metal oxide coated mica nacreous pigment in which at least about half of the mica has been removed by dissolution.
Claim 12
Dependent Claim
59 words
An unsupported non-toxic metal oxide platey nacreous pigment comprising platelets of metal oxide of about 1-75 microns in length and about 5-600 nm in thickness, incorporating up to 20% mica and exhibiting at least the same luster and reflection color intensity of double the weight of the corresponding metal oxide coated mica nacreous pigment of the same reflection color.
Claim 13
Dependent Claim
59 words
An unsupported non-toxic metal oxide platey nacreous pigment comprising platelets of metal oxide of about 1-75 microns in length and about 5-600 nm in thickness, incorporating up to 20% mica and exhibiting at least the same luster and reflection color intensity of double the weight of the corresponding metal oxide coated mica nacreous pigment of the same reflection color.
Claim 14
Dependent Claim
29 words
The unsupported metal oxide platey nacreous pigment of claim 10 having a length of about 2-35 microns, a thickness of about 20-400 nm and containing at least 1% mica.
Claim 15
Dependent Claim
17 words
The unsupported metal oxide platey nacreous pigment of claim 11 wherein said metal oxide is titanium dioxide.
Claim 16
Dependent Claim
20 words
The unsupported metal oxide platey nacreous pigment of claim 12 wherein said titanium dioxide is in the rutile crystalline form.
Claim 17
Dependent Claim
14 words
The unsupported metal oxide platey nacreous pigment produced by the process of claim 1.
Claim 18
Dependent Claim
14 words
The unsupported metal oxide platey nacreous pigment produced by the process of claim 8.
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) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |