US5500331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Comminution with small particle milling media
Assignee: Eastman Kodak Co
•
Filing: 1994-05-25
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Granted: 1996-03-19
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Expires: 2014-05-25
Abstract
Abstract A method of preparing submicron particles of a material, such as a pigment useful in paints or a compound useful in imaging elements, which comprises milling the agent in the presence of milling media having a mean particle size of less than about 100 microns. In a preferred embodiment, the milling media is a polymeric resin. The method provides extremely fine particles, e.g., less than 100 nm in size, free of unacceptable contamination.
Inventors
- 👤 David A. Czekai
- 👤 Larry P. Seaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:12
CPC Classifications
B; B02; B02C; B02C17/00; B02C17/18; B02C17/20; G; G03; G03C; G03C1/00; G03C1/005; G03C7/00; G03C7/30; G03C7/388
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
30 words
A method of preparing submicron particles of a compound useful in imaging elements in the presence of rigid milling media having a mean particle size of less than 100 microns.
Claim 2
Independent Claim
30 words
A method of preparing submicron particles of a compound useful in imaging elements in the presence of rigid milling media having a mean particle size of less than 100 microns.
Claim 3
Dependent Claim
12 words
The method of claim 1, wherein said media is a polymeric resin.
Claim 4
Dependent Claim
18 words
The method of claim 1, wherein said media have a mean particle size of less than 75 microns.
Claim 5
Dependent Claim
16 words
The method of claim 1, wherein said media have an average size of about 50 microns.
Claim 6
Dependent Claim
15 words
The method of claim 1, wherein said milling media comprises polystyrene crosslinked with divinyl benzene.
Claim 7
Dependent Claim
11 words
The method of claim 1, wherein said milling media comprises polymethylmethacrylate.
Claim 8
Dependent Claim
13 words
The method of claim 1, wherein said method is a wet milling process.
Claim 9
Dependent Claim
40 words
The method of claim 1, wherein said milling takes place in a mill selected from an airjet mill, a roller mill, a ball mill, an attritor mill, a vibratory mill, a planetary mill, a sand mill and a bead mill.
Claim 10
Dependent Claim
61 words
The method of claim 1, wherein the compound useful in imaging elements is selected from the group consisting of dye-forming couplers, development inhibitor release couplers (DIR's), development inhibitor anchimeric release couplers (DI(A)R's), masking couplers, filter dyes, optical brighteners, nucleators, development accelerators, oxidized developer scavengers, ultraviolet radiation absorbing compounds, sensitizing dyes, development inhibitors, antifoggants, bleach accelerators, magnetic particles, lubricants, and matting agents.
Claim 11
Dependent Claim
43 words
A dispersion for use in the preparation of an imaging element comprising a liquid medium having dispersed therein solid particles of a compound useful in imaging elements having an average particle diameter of less than 100 nm milled in accordance with claim 1.
Claim 12
Dependent Claim
16 words
An imaging element comprising a support having thereon at least one dispersion according to claim 10.
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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) | 1999-03-19 | 1999-09-18 | 2000-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-19 | 2003-09-18 | 2004-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-19 | 2007-09-18 | 2008-03-19 | $7700.00 | Window Closed / Lapsed |