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US4205997A
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Powdery pearlescent pigment compositions
Assignee: Merck Patent GmbH
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Filing: 1978-06-23
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Granted: 1980-06-03
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Expires: 1998-06-23
Abstract
Abstract Powdery pearlescent pigment compositions comprising individual particles of a flaky pearlescent pigment coated with 1 to 50 weight percent of a solid polymer, optionally containing wetting agents, fillers, additional coloring agents, UV-absorbers or scenting agents, are produced by combining a suspension of a flaky pearlescent pigment with a solution of a polymer, possibly containing other substances, and subsequently depositing polymer on the pigment flakes. The compositions can be used as pigments in cosmetics and can be stored and shipped as dry powders without loss of properties.
Inventors
- 👤 Reiner Hesse
- 👤 Hans Pratzer
- 👤 Manfred Kieser
- 👤 Gerhard Edler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:26
CPC Classifications
A; A61; A61K; A61K8/00; A61K8/18; A61K8/19; A61K8/02; A61K8/0241; A61K8/0254; A61K8/26; A61K8/29; A61K8/72; A61K8/81; A61K8/817; A61K8/8176; A61Q; A61Q1/00; A61Q1/02; A61Q1/12; C; C08; C08K; C08K9/00; C08K9/10; C09; C09C; C09C1/00; C09C1/0015; C09C1/0021; A61K2800/00; A61K2800/40; A61K2800/41; A61K2800/412; A61K2800/42; A61K2800/43; A61K2800/436; A61K2800/60; A61K2800/61; A61K2800/62; A61K2800/624; C01; C01P; C01P2004/00; C01P2004/20; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/20; C09C2200/00; C09C2200/10; C09C2200/1087; C09C2200/40; C09C2200/402; C09C2200/405; C09C2200/50; C09C2200/507; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
75 words
A dry, powdery essentially lusterless composition having resistance to agglomeration and the adverse effects of mechanical stresses during handling and shipment in the form of a dry powder, comprising individual particles of a flaky or plate-like pigment which in uncoated form are pearlescent, coated with 1-50% by weight of the coated particles of a removable coating of a solid polymer which lusterless composition, when the polymer coating is removed from the pigment particles, becomes pearlescent.
Claim 2
Dependent Claim
75 words
A dry, powdery essentially lusterless composition having resistance to agglomeration and the adverse effects of mechanical stresses during handling and shipment in the form of a dry powder, comprising individual particles of a flaky or plate-like pigment which in uncoated form are pearlescent, coated with 1-50% by weight of the coated particles of a removable coating of a solid polymer which lusterless composition, when the polymer coating is removed from the pigment particles, becomes pearlescent.
Claim 3
Dependent Claim
29 words
The composition of claim 1, wherein the solid polymer is polyvinyl pyrrolidone, polyacrylamide, nitrocellulose, alkyl cellulose, hydroxyalkyl cellulose, carboxymethyl cellulose, polystyrene, polyethylene, polypropylene, a polycarbonate, or a mixture thereof.
Claim 4
Dependent Claim
14 words
The composition of claim 2, wherein the pigment particles are coated with polyvinyl pyrrolidone.
Claim 5
Dependent Claim
20 words
The composition of claim 1, wherein the coated particles contain up to 1% by weight thereof of a wetting agent.
Claim 6
Dependent Claim
17 words
The composition of claim 1, containing up to 40% by weight thereof of an additional color pigment.
Claim 7
Dependent Claim
18 words
The composition of claim 1, wherein the pearlescent pigment particles are nacreous metal oxide-coated mica flake pigment particles.
Claim 8
Dependent Claim
16 words
The composition of claim 1, wherein the pearlescent pigment particles are nacreous bismuth oxy-chloride pigment particles.
Claim 9
Dependent Claim
22 words
The composition of claim 6, wherein the pigment particles are coated with 2-25% by weight of the coated particles of polyvinyl pyrrolidone.
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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) | 1983-06-03 | 1983-12-03 | 1984-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-03 | 1987-12-03 | 1988-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-03 | 1991-12-03 | 1992-06-03 | $7700.00 | Window Closed / Lapsed |