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Patent US4309480A successfully refreshed from Google Patents.
US4309480A
Expired / Lapsed
US
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Iron blue nacreous pigments
Assignee: BASF Catalysts LLC
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Filing: 1980-02-28
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Granted: 1982-01-05
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Expires: 2000-02-28
Abstract
Abstract An iron blue coated substrate nacreous pigment which yields less than ten parts per million of water-soluble cyanide due to the stability thereof to heat during drying is prepared by the admixing of the substrate, ferric ion reactant, and ferrocyanide reactant under conditions such that the ferric ion and ferrocyanide reactants are in substantially stoichiometric proportions and the pH is at constant value within the range of 2.5-4.0, and adding an aluminum-containing reactant so as to form aluminum hydroxide in addition to the iron blue on said substrate. The product shows a brighter, cleaner, and purer blue color than iron blue coated substrate products prepared by other procedures.
Inventors
- 👤 Louis Armanini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:21
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0021; C01; C01P; C01P2006/00; C01P2006/12; C09C2200/00; C09C2200/10; C09C2200/102; C09C2200/40; C09C2200/401; C09C2220/00; C09C2220/10; C09C2220/106; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
15 words
An iron blue coated nacreous pigment substrate of less than 10 ppm water soluble cyanide.
Claim 2
Dependent Claim
15 words
An iron blue coated nacreous pigment substrate of less than 10 ppm water soluble cyanide.
Claim 3
Dependent Claim
13 words
The iron blue coated substrate of claim 1 including an aluminum hydroxide coating.
Claim 4
Dependent Claim
22 words
The iron blue coated substrate of claim 2 wherein the iron blue coating is about 0.1-10% of the iron blue coated substrate.
Claim 5
Dependent Claim
17 words
The iron blue coated substrate of claim 2 wherein the amount of iron blue is about 1-5%.
Claim 6
Dependent Claim
16 words
The iron blue coated substrate of claim 2 wherein the substrate is TiO 2 coated mica.
Claim 7
Independent Claim
80 words
A method of preparing an iron blue coated nacreous pigment substrate of less than 10 ppm water soluble cyanide comprising admixing the substrate, ferric ion reactant and ferrocyanide reactant under conditions such that the ferric ion reactant and ferrocyanide reactant are always substantially in stoichiometric proportions and the pH is at a constant value within the range of 2.5-4.0, and adding an aluminum containing reactant so as to form aluminum hydroxide in addition to the iron blue on the substrate.
Claim 8
Independent Claim
80 words
A method of preparing an iron blue coated nacreous pigment substrate of less than 10 ppm water soluble cyanide comprising admixing the substrate, ferric ion reactant and ferrocyanide reactant under conditions such that the ferric ion reactant and ferrocyanide reactant are always substantially in stoichiometric proportions and the pH is at a constant value within the range of 2.5-4.0, and adding an aluminum containing reactant so as to form aluminum hydroxide in addition to the iron blue on the substrate.
Claim 9
Dependent Claim
11 words
The method of claim 6 wherein said pH is about 3.0.
Claim 10
Dependent Claim
21 words
The method of claim 6 wherein the aluminum containing reactant is added simultaneously with the ferric ion reactant and ferrocyanide reactant.
Claim 11
Dependent Claim
18 words
The method of claim 6 wherein the aluminum containing reactant is added subsequent to the iron blue formation.
Claim 12
Dependent Claim
33 words
The method of claim 6 wherein the substrate is TiO 2 coated mica, the ferric ion reactant is ferric chloride, the ferrocyanide reactant is potassium ferrocyanide and the aluminum reactant is aluminum chloride.
Claim 13
Dependent Claim
22 words
The method of claim 10 including the step of drying the iron blue and aluminum hydroxide coated TiO 2 coated mica substrate.
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) | 1985-01-04 | 1985-07-06 | 1986-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-04 | 1989-07-06 | 1990-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-04 | 1993-07-06 | 1994-01-05 | $7700.00 | Window Closed / Lapsed |