US3656982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pearlescent pigment
Assignee: Mallinckrodt Chemical Works
•
Filing: 1970-05-04
•
Granted: 1972-04-18
•
Expires: 1990-05-04
Abstract
Abstract The luster, compressibility and other cosmetically important properties of various pearlescent pigments are substantially improved by coating the surface of the pigment particles with a composition comprising a precipitated water-insoluble metal stearate and a surfactant.
Inventors
- 👤 Douglas W Chapman
- 👤 Wilbur H Mckellin
- 👤 R Dean Overley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:45
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0021; C09C3/00; C09C3/08; C01; C01P; C01P2004/00; C01P2004/20; C01P2004/80; C01P2006/00; C01P2006/20; C09C2200/00; C09C2200/10; C09C2200/102; C09C2200/1087; C09C2200/40; C09C2200/401; C09C2200/402; C09C2200/403
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
25 words
A pigment according to claim 1 wherein the wetting agent is a nonionic surfactant having an HLB value in the range of 5 to 16.
Claim 2
Dependent Claim
20 words
A pigment according to claim 1 wherein the surfactant is a polyoxyethylene derivative having an HLB value of about 10.
Claim 3
Dependent Claim
24 words
A pigment according to claim 1 wherein the metal soap is an alkaline earth salt of a saturated fatty acid having 12-20 carbon atoms.
Claim 4
Dependent Claim
83 words
Method for treating a pearlescent pigment selected from bismuth oxychloride platelets, mica platelets coated witH bismuth oxychloride and mica platelets coated with titanium dioxide, which comprises suspending the pigment in water; dispersing a water-soluble salt of a higher fatty acid in the suspension; gradually adding to the said suspension an aqueous solution containing cations which form an insoluble soap; adding to said suspension an aqueous dispersion of a water-insoluble surfactant; and recovering the pearlescent pigment in the form of substantially dry free-flowing particles.
Claim 5
Dependent Claim
18 words
Method of claim 5 wherein the surfactant has an HLB value in the range of 5 to 16.
Claim 6
Dependent Claim
18 words
Method of claim 5 wherein the surfactant is a polyoxyethylene derivative having an HLB value of about 10.
Claim 7
Dependent Claim
21 words
Method of claim 5 wherein the soap is an alkaline earth salt of a saturated fatty acid having 12-20 carbon atoms.
References Cited (Backward Citations)
US3025179A
Cited
US3262802A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-18 | 1975-10-18 | 1976-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-18 | 1979-10-18 | 1980-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-18 | 1983-10-18 | 1984-04-18 | $7700.00 | Window Closed / Lapsed |