US4859497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for imparting stir-in capabilities to a silver activated zinc sulfide phosphor
Assignee: Osram Sylvania Inc
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Filing: 1988-04-25
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Granted: 1989-08-22
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Expires: 2008-04-25
Abstract
Abstract A process is disclosed for pigmenting and coating a silver activated zinc sulfide phosphor and for imparting stir-in capabilities to the phosphor. The process comprises deagglomerating the phosphor, forming an aqueous slurry of phosphor particles, pigment particles, a binding agent which can be latex polymers or copolymers, the binding agent having a glass transition temperature of greater than about 20° C. and a silica-based compound to produce a silica based coating on the phosphor particles, and agitating the slurry, separating the solids from the resulting liquor, and drying the solids at a temperature above the Minimum Film Formation Temperature of the latex to produce the phosphor particles wherein the pigment particles are bonded to them and wherein the pigmented phosphor particles are coated with the silica-based coating. The process comprises also pigmenting the phosphor and imparting stir-in capabilities thereto by the process as described above without adding the coating agent to the slurry. The process comprises also coating the phosphor and imparting stir in capabilities thereto by the above process without the pigments and binding agent.
Inventors
- 👤 Robert W. Wolfe
- 👤 James E. Morse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:09
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/58; C09K11/582; C09K11/584; C09K11/02; C09K11/025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
118 words
A process for pigmenting a silver activated zinc sulfide phosphor and imparting stir-in capabilities thereto, said process comprising: (a) deagglomerating said phosphor; (b) forming an aqueous slurry of the phosphor particles, pigment particles, and a binding agent selected from the group consisting of latex polymers and latex copolymers, said binding agent having a glass transition temperature of greater than about 20° C., and agitating said slurry; (c) separating the solids from the resulting liquor; (d) drying said solids at a temperature above the Minimum Film Formation Temperature of said latex to produce the phosphor particles wherein said pigment particles are bonded to said phosphor particles; and (e) blending the resulting pigmented phosphor to insure uniformity in said phosphor.
Claim 2
Dependent Claim
118 words
A process for pigmenting a silver activated zinc sulfide phosphor and imparting stir-in capabilities thereto, said process comprising: (a) deagglomerating said phosphor; (b) forming an aqueous slurry of the phosphor particles, pigment particles, and a binding agent selected from the group consisting of latex polymers and latex copolymers, said binding agent having a glass transition temperature of greater than about 20° C., and agitating said slurry; (c) separating the solids from the resulting liquor; (d) drying said solids at a temperature above the Minimum Film Formation Temperature of said latex to produce the phosphor particles wherein said pigment particles are bonded to said phosphor particles; and (e) blending the resulting pigmented phosphor to insure uniformity in said phosphor.
Claim 3
Dependent Claim
136 words
A process for pigmenting and coating a silver activated zinc sulfide phosphor and imparting stir-in capabilities thereto, said process comprising: (a) deagglomerating said phosphor; (b) forming an aqueous slurry of the phosphor particles, pigment particles, a binding agent selected from the group consisting of latex polymers and latex copolymers, said binding agent having a glass transition temperature of greater than about 20° C., a silica-based coating agent and zinc hydroxide to produce a silica-based coating on the phosphor particles, and agitating said slurry; (c) separating the solids from the resulting liquor; (d) drying said solids at a temperature above the Minimum Film Formation Temperature of said latex to produce the phosphor particles wherein said pigment particles are bonded to said phosphor particles; and (e) blending the resulting pigmented coated phosphor to insure uniformity in said phosphor.
Claim 4
Dependent Claim
136 words
A process for pigmenting and coating a silver activated zinc sulfide phosphor and imparting stir-in capabilities thereto, said process comprising: (a) deagglomerating said phosphor; (b) forming an aqueous slurry of the phosphor particles, pigment particles, a binding agent selected from the group consisting of latex polymers and latex copolymers, said binding agent having a glass transition temperature of greater than about 20° C., a silica-based coating agent and zinc hydroxide to produce a silica-based coating on the phosphor particles, and agitating said slurry; (c) separating the solids from the resulting liquor; (d) drying said solids at a temperature above the Minimum Film Formation Temperature of said latex to produce the phosphor particles wherein said pigment particles are bonded to said phosphor particles; and (e) blending the resulting pigmented coated phosphor to insure uniformity in said phosphor.
Claim 5
Dependent Claim
12 words
A process of claim 2 wherein said silica-based compound is silicon dioxide.
Claim 6
Dependent Claim
77 words
A process for coating a silver activated zinc sulfide phosphor and imparting stir-in capabilities thereto, said process comprising: (a) deagglomerating said phosphor; (b) forming an aqueous slurry of phosphor particles, and a silica-based compound as a coating agent and zinc hydroxide to produce a silica-based coating on said phosphor; (c) separating the resulting coated phosphor particles from the resulting liquor; (d) drying said coated phosphor; and (e) blending said coated phosphor to insure uniformity in said phosphor.
Claim 7
Dependent Claim
77 words
A process for coating a silver activated zinc sulfide phosphor and imparting stir-in capabilities thereto, said process comprising: (a) deagglomerating said phosphor; (b) forming an aqueous slurry of phosphor particles, and a silica-based compound as a coating agent and zinc hydroxide to produce a silica-based coating on said phosphor; (c) separating the resulting coated phosphor particles from the resulting liquor; (d) drying said coated phosphor; and (e) blending said coated phosphor to insure uniformity in said phosphor.
Claim 8
Dependent Claim
12 words
A process of claim 4 wherein said silica-based compound is silicon dioxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-21 | 1993-02-20 | 1993-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-21 | 1997-02-20 | 1997-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-21 | 2001-02-20 | 2001-08-22 | $7700.00 | Window Closed / Lapsed |