US4168986A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing lamellar pigments
Assignee: Polaroid Corp
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Filing: 1978-07-03
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Granted: 1979-09-25
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Expires: 1998-07-03
Abstract
Abstract A method for the production of lamellar pigments by a vacuum deposition process is described. The method involves the deposition of a thin layer of sodium fluoride release-substrate material upon a suitable condensing surface, e.g., a moving polyester web, and the deposition thereon of a thin film of lamellar pigment-producing material. The resulting lamellar pigment material is removed from the condensing surface by dissolving the sodium fluoride release substrate material in a substance, e.g., water, which is a nonsolvent for the lamellar pigment material. The material is fragmented into lamellar pigment particles for utilization in a number of applications where the light-reflective properties of such pigment materials are desired. The utilization of a sodium fluoride release layer permits more efficient control of the rate of deposition of the desired release layer and provides lamellar pigments of desirable specular reflectivity.
Inventors
- 👤 Joseph J. Venis, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:08
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/0015; C09C1/0024; C09C1/0018; C23; C23C; C23C14/00; C23C14/0005; C23C14/06; C23C14/0694; G; G03; G03C; G03C1/00; G03C1/76; G03C1/95; G03C8/00; G03C8/42; G03C8/44; G03C8/48; G03C8/52; C01; C01P; C01P2004/00; C01P2004/60; C01P2004/61; C09C2200/00; C09C2200/10; C09C2200/1004; C09C2200/30; C09C2200/301; C09C2200/302; C09C2200/303; C09C2220/00; C09C2220/20
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
100 words
In a method for preparing a lamellar pigment material comprising the steps of first depositing onto a surface under vacuum a thin layer of a release-substrate material; thereafter, depositing under vacuum onto said layer of release-substrate material at least one layer of a lamellar pigment-producing material; dissolving said release-substrate material in a liquid which is a solvent for said release-substrate material and a non-solvent for said lamellar pigment material, thereby to remove said lamellar pigment material from said surface; and fragmenting said lamellar pigment material to lamellar pigment particles; the improvement which comprises utilizing sodium fluoride as said release-substrate material.
Claim 2
Dependent Claim
100 words
In a method for preparing a lamellar pigment material comprising the steps of first depositing onto a surface under vacuum a thin layer of a release-substrate material; thereafter, depositing under vacuum onto said layer of release-substrate material at least one layer of a lamellar pigment-producing material; dissolving said release-substrate material in a liquid which is a solvent for said release-substrate material and a non-solvent for said lamellar pigment material, thereby to remove said lamellar pigment material from said surface; and fragmenting said lamellar pigment material to lamellar pigment particles; the improvement which comprises utilizing sodium fluoride as said release-substrate material.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said sodium fluoride release-substrate material and said lamellar pigment-producing material are deposited onto said surface from within a single vacuum chamber.
Claim 4
Dependent Claim
16 words
The method of claim 2 wherein said surface is a moving belt having a smooth surface.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein said moving belt comprises a polyester web.
Claim 6
Dependent Claim
22 words
The method of claim 3 wherein said sodium fluoride and said lamellar pigment-producing materials are deposited in a plurality of alternating layers.
Claim 7
Dependent Claim
24 words
The method of claim 1 wherein said lamellar pigment material is removed from said surface by dissolving said sodium fluoride release-substrate material in water.
Claim 8
Dependent Claim
62 words
The method of claim 1 wherein said lamellar pigment-producing material is deposited onto said sodium fluoride release-substrate material as a layer having a thickness within the expression: T=(λ/4)/n (or an odd multiple thereof) wherein T is the geometric thickness thereof, λ represents a wavelength in the visible region of the spectrum and n represents the index of refraction of the layer material.
Claim 9
Dependent Claim
14 words
The method of claim 7 wherein said index of refraction is at least 1.7.
Claim 10
Dependent Claim
21 words
The method of claim 8 wherein said index of refraction is in the range of from about 2.0 to about 2.8.
Claim 11
Dependent Claim
23 words
The method of claim 8 wherein λ represents a wavelength or wavelength range of radiation between about 5000 A to about 5500 A.
Claim 12
Dependent Claim
13 words
A method of claim 1 wherein said lamellar pigment-providing material comprises titanium dioxide.
Claim 13
Dependent Claim
13 words
The method of claim 1 wherein said lamellar pigment-providing material comprises zirconium dioxide.
Claim 14
Dependent Claim
22 words
The method of claim 1 wherein a plurality of layers of lamellar pigment-producing materials is deposited onto said sodium fluoride release-substrate material.
Claim 15
Dependent Claim
49 words
The method of claim 13 wherein said plurality of layers comprises an odd number of layers and said layers comprise layers of high index material having an index of refraction of at least 1.7 separated by an adjacent layer having an index of refraction of about 1.5 or lower.
Claim 16
Dependent Claim
52 words
The method of claim 14 wherein each of said plurality of layers has a thickness within the expression: T=(λ/4)/n (or an odd multiple thereof) wherein T is the geometric thickness thereof, λ represents a wavelength in the visible region of the spectrum and n represents the index of refraction of the layer.
Claim 17
Dependent Claim
25 words
The method of claim 15 wherein the refractive index of each of said layers of high refractive index is from about 2.0 to about 2.8.
Claim 18
Dependent Claim
23 words
The method of claim 16 wherein λ represents a wavelength or wavelength range of radiation between about 5000 A and about 5500 A.
Claim 19
Dependent Claim
26 words
The method of claim 15 wherein said odd number of layers comprises three layers and each of said layers of high refractive index comprises titanium dioxide.
Claim 20
Dependent Claim
26 words
The method of claim 15 wherein said odd number of layers comprises five layers and each of said layers of high refractive index comprises titanium dioxide.
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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) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |