Patent US4976787A successfully refreshed from Google Patents.
US4976787A
Expired / Lapsed
US
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Pigment
Assignee: Toyota Motor Corp
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Filing: 1990-03-14
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Granted: 1990-12-11
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Expires: 2010-03-14
Abstract
Abstract A pigment comprises a substrate, a metallic layer formed on at least one surface of the substrate and imparting metallic luster, and a transparent inorganic compound layer formed on surfaces of the substrate and the metallic layer. Thereby, the pigment produces color by light interference of a ray reflected on a surface of the transparent inorganic compound layer and a ray passed through the transparent inorganic compound layer and reflected on a surface of the metallic layer. Thus, the pigment is excellent in coloring power and hiding power, and particularly useful for an automotive finishing paint.
Inventors
- 👤 Hiroshi Ito
- 👤 Junichi Handa
- 👤 Yoshio Takagi
- 👤 Taketoshi Minohara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:16
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0078; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C01P2004/80; C01P2004/82; C01P2004/84
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
88 words
A method for forming a pigment which produces interference color, comprising the steps of: plating pearl mica comprising mica with a titanium dioxide layer formed on all surfaces of said mica with a chromium compound, and plating said chrome-plated pearl mica with a metal ar an alloy by electroless plating, whereby a metallic layer is formed in a scattered manner on an interface between said mica and said titanium dioxide, said metallic layer being formed in gaps between particles of said titanium dioxide and around said titanium dioxide.
Claim 2
Independent Claim
88 words
A method for forming a pigment which produces interference color, comprising the steps of: plating pearl mica comprising mica with a titanium dioxide layer formed on all surfaces of said mica with a chromium compound, and plating said chrome-plated pearl mica with a metal ar an alloy by electroless plating, whereby a metallic layer is formed in a scattered manner on an interface between said mica and said titanium dioxide, said metallic layer being formed in gaps between particles of said titanium dioxide and around said titanium dioxide.
Claim 3
Dependent Claim
17 words
A method according to claim 1, wherein said step of plating said chrome-plated pearl mica employs silver.
Claim 4
Dependent Claim
33 words
A method according to claim 2, wherein said silver is plated in an amount in the range of from 1 to 100% by weight based of 100% by weight of said pearl mica.
Claim 5
Dependent Claim
29 words
A method according to claim 1, wherein the chromium contained in the plated chromium compound is from 0.05-5% by weight based on 100% by weight of said pearl mica.
References Cited (Backward Citations)
US4038099A
Cited
JPS5019127A
Cited
US4134776A
Cited
JPS5978265A
Cited
US4828623A
Cited
US4867794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-10 | 1994-06-11 | 1994-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-10 | 1998-06-11 | 1998-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-10 | 2002-06-11 | 2002-12-11 | $7700.00 | Window Closed / Lapsed |