US4435220A
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US
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Transparent colored pigments
Assignee: Merck Patent GmbH
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Filing: 1982-10-26
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Granted: 1984-03-06
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Expires: 2002-10-26
Abstract
Abstract Transparent, colored pigments based on platelet-shaped, transparent substrates, such as mica, talc or glass, are coated with colored metal oxides or metal hydroxides, wherein the metal oxide or hydroxide layer contains 0.1-5% by weight of an alkaline earth metal compound. These new, transparent, colored pigments are prepared by a process in which a platelet-shaped, transparent substrate, such as mica, talc or glass, is coated, in the presence of a base, with a colored metal oxide or hydroxide, and 0.1 to 5% by weight of an alkaline earth metal oxide or hydroxide is incorporated in the layer. The pigments have improved dispersibility, gloss, color power and stability to heat and weathering and also filling and adhesion properties. The pigments can be used for all the customary purposes, especially in cosmetics.
Inventors
- 👤 Takaji Watanabe
- 👤 Tamio Noguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:59
CPC Classifications
C; C09; C09C; C09C3/00; C09C3/06; A; A61; A61K; A61K8/00; A61K8/02; A61K8/0241; A61K8/0254; A61K8/18; A61K8/19; A61K8/26; A61Q; A61Q1/00; A61Q1/02; C09C1/00; C09C1/0015; C09C1/0021; A61K2800/00; A61K2800/20; A61K2800/26; A61K2800/262; A61K2800/40; A61K2800/41; A61K2800/412; A61K2800/42; A61K2800/43; A61K2800/60; A61K2800/61; A61K2800/62; A61K2800/621; A61K2800/65; A61K2800/651; C01; C01P; C01P2004/00; C01P2004/80; C01P2004/82; C01P2004/84; C09C2200/00; C09C2200/10; C09C2200/102; C09C2220/00; C09C2220/10; C09C2220/106
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
37 words
A transparent, colored pigment comprising a platelet-shaped, transparent substrate, which is coated with a layer of colored metal oxides or metal hydroxides, and which layer contains 0.1-5% by weight of an alkaline earth metal oxide or hydroxide.
Claim 2
Dependent Claim
37 words
A transparent, colored pigment comprising a platelet-shaped, transparent substrate, which is coated with a layer of colored metal oxides or metal hydroxides, and which layer contains 0.1-5% by weight of an alkaline earth metal oxide or hydroxide.
Claim 3
Dependent Claim
13 words
A pigment of claim 1 wherein the substrate is mica, talc or glass.
Claim 4
Dependent Claim
43 words
A pigment of claim 1 wherein the colored metal oxide or hydroxide is FeO(OH), Fe(OH) 2 , Fe(OH) 3 , Co(OH) 2 , Cr(OH) 3 , Fe 2 O 3 , Fe 3 O 4 , CoO or Cr 2 O 3 .
Claim 5
Dependent Claim
20 words
A pigment of claim 1 wherein the layer further contains Al 2 O 3 , ZnO or TiO 2 .
Claim 6
Dependent Claim
15 words
A pigment of claim 1 wherein the alkaline earth metal is calcium, magnesium or barium.
Claim 7
Dependent Claim
15 words
A pigment of claim 1 wherein the substrate has a particle size of 1-100 μm.
Claim 8
Dependent Claim
107 words
A process for the preparation of a transparent, colored pigment comprising a platelet-shaped, transparent substrate, which is coated with a layer of a colored metal oxide or metal hydroxide, and which layer contains 0.1-5% by weight of an alkaline earth metal oxide or hydroxide; comprising adding a base to a suspension of a platelet-shaped, transparent substrate in an aqueous solution of a soluble salt of the metal in said colored metal oxide or hydroxide and a soluble alkaline earth metal salt thereby coating the substrate with a colored metal oxide or hydroxide and an alkaline earth metal oxide or hydroxide; separating off the substrate and drying it.
Claim 9
Dependent Claim
107 words
A process for the preparation of a transparent, colored pigment comprising a platelet-shaped, transparent substrate, which is coated with a layer of a colored metal oxide or metal hydroxide, and which layer contains 0.1-5% by weight of an alkaline earth metal oxide or hydroxide; comprising adding a base to a suspension of a platelet-shaped, transparent substrate in an aqueous solution of a soluble salt of the metal in said colored metal oxide or hydroxide and a soluble alkaline earth metal salt thereby coating the substrate with a colored metal oxide or hydroxide and an alkaline earth metal oxide or hydroxide; separating off the substrate and drying it.
Claim 10
Dependent Claim
11 words
A process of claim 7 further comprising calcining the coated substrate.
Claim 11
Dependent Claim
11 words
A process of claim 7 further comprising washing the separated substrate.
Claim 12
Dependent Claim
10 words
A process of claim 7 wherein the base is urea.
Claim 13
Dependent Claim
21 words
A process of claim 7 wherein the alkaline earth metal salt is MgSO 4 , MgCl 2 or CaCl 2 .
Claim 14
Dependent Claim
25 words
In a colored composition comprising a base ingredient and a coloring agent, the improvement wherein the coloring agent is a colored pigment of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |