US4298650A
Expired / Lapsed
US
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Phosphorescent screens
Assignee: Eastman Kodak Co
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Filing: 1980-03-31
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Granted: 1981-11-03
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Expires: 2000-03-31
Abstract
Abstract Phosphorescent screens which are useful for such purposes as intensifying screens for radiographs are comprised of a support bearing a layer of finely-divided particles of a phosphor dispersed in a cross-linked polymeric matrix formed by heat-curing of a coating composition comprising an unsaturated cross-linkable polymer, a polymerizable acrylic monomer, a thermoplastic polyurethane elastomer, and a heat-activatable polymerization initiator. The phosphor layer includes voids formed by evaporation of an evaporable component which is present in the coating composition from which such layer is formed.
Inventors
- 👤 Chen-i Lu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:37
CPC Classifications
G; G21; G21K; G21K4/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249986; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T428/25; Y10T428/256; Y10T428/258; Y10T428/31504; Y10T428/31511; Y10T428/31551; Y10T428/31565; Y10T428/31591
Claims Analysis
Total Claims: 43
Claim 1
Independent Claim
156 words
A phosphorescent screen comprising a support and a layer of finely-divided particles of a phosphor dispersed in a cross-linked, void-containing polymeric matrix, said layer having been formed by: (1) coating said support with a heat-curable composition comprising a suspension of said finely-divided phosphor particles in a viscous liquid composition, said viscous liquid composition comprising a first component that is capable of being heat-cured to form a cross-linked polymeric matrix surrounding said phosphor particles and a second component that is capable of being evaporated to generate voids within said matrix, said first component comprising: (a) an unsturated crosslinkable polymer, (b) a polymerizable acrylic monomer, (c) a thermoplastic polyurethane elastomer, and (d) a heat-activatable polymerization initiator, and (2) heating said coating for a time and at a temperature sufficient to cure said first component, to thereby form a cross-linked polymeric matrix surrounding said phosphor particles, and to evaporate said second component, to thereby generate voids within said matrix.
Claim 2
Dependent Claim
156 words
A phosphorescent screen comprising a support and a layer of finely-divided particles of a phosphor dispersed in a cross-linked, void-containing polymeric matrix, said layer having been formed by: (1) coating said support with a heat-curable composition comprising a suspension of said finely-divided phosphor particles in a viscous liquid composition, said viscous liquid composition comprising a first component that is capable of being heat-cured to form a cross-linked polymeric matrix surrounding said phosphor particles and a second component that is capable of being evaporated to generate voids within said matrix, said first component comprising: (a) an unsturated crosslinkable polymer, (b) a polymerizable acrylic monomer, (c) a thermoplastic polyurethane elastomer, and (d) a heat-activatable polymerization initiator, and (2) heating said coating for a time and at a temperature sufficient to cure said first component, to thereby form a cross-linked polymeric matrix surrounding said phosphor particles, and to evaporate said second component, to thereby generate voids within said matrix.
Claim 3
Dependent Claim
30 words
A phosphorescent screen as claimed in claim 1 wherein the void content of said phosphor layer is in the range of from about 1 to about 20 percent by volume.
Claim 4
Dependent Claim
29 words
A phosphorescent screen as claimed in claim 1 wherein the void content of said phosphor layer is in the range from about 5 to about 15 percent by volume.
Claim 5
Dependent Claim
22 words
A phosphorescent screen as claimed in claim 1 wherein the void content of said phosphor layer is about 10 percent by volume.
Claim 6
Dependent Claim
27 words
A phosphorescent screen as claimed in claim 1 wherein the particle size of said phosphor particles is in the range from about 1 to about 100 microns.
Claim 7
Dependent Claim
16 words
A phosphorescent screen as claimed in claim 1 wherein said phosphor is europium-activated barium strontium sulfate.
Claim 8
Dependent Claim
18 words
A phosphorescent screen as claimed in claim 1 wherein said unsaturated crosslinkable polymer is an acrylated epoxy resin.
Claim 9
Dependent Claim
30 words
A phosphorescent screen as claimed in claim 1 wherein said unsaturated crosslinkable polymer is an acrylated epoxy resin which is a condensation product of epichlorohydrin, bisphenol-A and an acrylic monomer.
Claim 10
Dependent Claim
38 words
A phosphorescent screen as claimed in claim 1 wherein said unsaturated crosslinkable polymer is an acrylated epoxy resin of the formula: ##STR5## wherein R is a hydrogen atom or a methyl group and n is 1 to 20.
Claim 11
Dependent Claim
30 words
A phosphorescent screen as claimed in claim 1 wherein said unsaturated crosslinkable polymer is an acrylated epoxy resin of the formula: ##STR6## wherein n has a value of about 13.
Claim 12
Dependent Claim
16 words
A phosphorescent screen as claimed in claim 1 wherein said polymerizable acrylic monomer is butyl acrylate.
Claim 13
Dependent Claim
17 words
A phosphorescent screen as claimed in claim 1 wherein said thermoplastic polyurethane elastomer is a polyester-based polyurethane.
Claim 14
Dependent Claim
17 words
A phosphorescent screen as claimed in claim 1 wherein said thermoplastic polyurethane elastomer is a polyether-based polyurethane.
Claim 15
Dependent Claim
23 words
A phosphorescent screen as claimed in clim 1 wherein said thermoplastic polyurethane elastomer is a reaction product of 1,4-butanediol, adipic acid and toluenediisocyanate.
Claim 16
Dependent Claim
17 words
A phosphorescent screen as claimed in claim 1 wherein said heat-activatable polymerization initiator is an azo initiator.
Claim 17
Dependent Claim
15 words
A phosphorescent screen as claimed in claim 1 wherein said heat-activatable polymerization initiator is 2,2'-azobis(isobutyronitrile).
Claim 18
Dependent Claim
26 words
A phosphorescent screen as claimed in claim 1 wherein said unsaturated crosslinkable polymer is a mixture of an acrylated epoxy resin and an acrylated urethane resin.
Claim 19
Dependent Claim
32 words
A phosphorescent screen as claimed in claim 1 wherein said second component is an organic liquid having a normal boiling point in the range from about 40° C. to about 85° C.
Claim 20
Dependent Claim
15 words
A phosphorescent screen as claimed in claim 1 wherein said second component is a ketone.
Claim 21
Dependent Claim
16 words
A phosphorescent screen as claimed in claim 1 wherein said second component is methyl ethyl ketone.
Claim 22
Dependent Claim
15 words
A phosphorescent screen as claimed in claim 1 wherein said support is a polyester film.
Claim 23
Dependent Claim
16 words
A phosphorescent screen as claimed in claim 1 wherein said support is a poly(ethylene terephthalate) film.
Claim 24
Dependent Claim
17 words
A phosphorescent screen as claimed in claim 1 wherein said support is a silver coated polyester film.
Claim 25
Dependent Claim
14 words
A phosphorescent screen as claimed in claim 1 where said support is baryta-coated paper.
Claim 26
Dependent Claim
28 words
A phosphorescent screen as claimed in claim 1 wherein the phosphor coverage of said screen is in the range from about 10 to about 100 grams/ft 2 .
Claim 27
Dependent Claim
18 words
A phosphorescent screen as claimed in claim 1 wherein said polyurethane elastomer is uniformly distributed throughout said matrix.
Claim 28
Dependent Claim
64 words
A phosphorescent screen comprising a support and a layer of a composition comprising finelydivided phosphor particles in a heat-cured, crosslinked, void-containing polymeric matrix resulting from the heating of a mixture comprising: (a) an unsaturated crosslinkable polymer, (b) a polymerizable acrylic monomer, (c) a thermoplastic polyurethane elastomer, (d) a heat-activatable polymerization initiator, and (e) a component that evaporates during said heating to form said voids.
Claim 29
Dependent Claim
64 words
A phosphorescent screen comprising a support and a layer of a composition comprising finelydivided phosphor particles in a heat-cured, crosslinked, void-containing polymeric matrix resulting from the heating of a mixture comprising: (a) an unsaturated crosslinkable polymer, (b) a polymerizable acrylic monomer, (c) a thermoplastic polyurethane elastomer, (d) a heat-activatable polymerization initiator, and (e) a component that evaporates during said heating to form said voids.
Claim 30
Dependent Claim
32 words
A phosphorescent screen as claimed in claim 27 wherein said evaporable component is an organic liquid having a normal boiling point in the range from about 40° C. to about 85° C.
Claim 31
Independent Claim
142 words
A method for the manufacture of a phosphorescent screen, said method comprising the steps of: (1) coating a support with a heat-curable composition comprising a suspension of finely-divided phosphor particles in a viscous liquid composition, said viscous liquid composition comprising a first component that is capable of being heatcured to form a cross-linked polymeric matrix surrounding said phosphor particles and a second component that is capable of being evaporated to generate voids within said matrix, said first component comprising: (a) an unsaturated crosslinkable polymer, (b) a polymerizable acrylic monomer, (c) a thermoplastic polyurethane elastomer, and (d) a heat-activatable polymerization initiator, and (2) heating said coating for a time and at a temperature sufficient to cure said first component, to thereby form a cross-linked polymeric matrix surrounding said phosphor particles, and to evaporate said second component, to thereby generate voids within said matrix.
Claim 32
Independent Claim
142 words
A method for the manufacture of a phosphorescent screen, said method comprising the steps of: (1) coating a support with a heat-curable composition comprising a suspension of finely-divided phosphor particles in a viscous liquid composition, said viscous liquid composition comprising a first component that is capable of being heatcured to form a cross-linked polymeric matrix surrounding said phosphor particles and a second component that is capable of being evaporated to generate voids within said matrix, said first component comprising: (a) an unsaturated crosslinkable polymer, (b) a polymerizable acrylic monomer, (c) a thermoplastic polyurethane elastomer, and (d) a heat-activatable polymerization initiator, and (2) heating said coating for a time and at a temperature sufficient to cure said first component, to thereby form a cross-linked polymeric matrix surrounding said phosphor particles, and to evaporate said second component, to thereby generate voids within said matrix.
Claim 33
Dependent Claim
31 words
A method as claimed in claim 29 wherein said second component is an organic liquid having a normal boiling point in the range from about 40° C. to about 85° C.
Claim 34
Dependent Claim
44 words
A method as claimed in claim 29 wherein said second component is present in said viscous liquid composition in an amount sufficient to provide a void content in said phosphor layer in the range of from about 5 to about 15 percent by volume.
Claim 35
Dependent Claim
38 words
A method as claimed in claim 29 wherein said heating is carried out for a period of from about 5 to about 30 minutes at a temperature in the range from about 50° C. to about 150° C.
Claim 36
Dependent Claim
15 words
A method as claimed in claim 29 wherein said support is a poly(ethlene terehthalate) film.
Claim 37
Dependent Claim
31 words
A method as claimed in claim 29 wherein said unsaturated crosslinkable polymer is an acrylated epoxy resin, said polymerizable acrylic monomer is butyl acrylate, and said heat-activatable polymerization initiator is 2,2'-azobis(isobutyronitrile).
Claim 38
Dependent Claim
89 words
A coating composition which is useful in the manufacture of phosphorescent screens, said composition comprising a suspension of finely-divided phosphor particles in a liquid medium, said liquid medium including a first component that is capable of being heat-cured to form a cross-linked polymeric matrix surrounding said phosphor particles and a second component that is capable of being evaporated to generate voids within said matrix, said first component comprising: (a) an unsaturated crosslinkable polymer, (b) a polymerizable acrylic monomer, (c) a thermoplastic polyurethane elastomer, and (d) a heat-activatable polymerization initiator.
Claim 39
Dependent Claim
89 words
A coating composition which is useful in the manufacture of phosphorescent screens, said composition comprising a suspension of finely-divided phosphor particles in a liquid medium, said liquid medium including a first component that is capable of being heat-cured to form a cross-linked polymeric matrix surrounding said phosphor particles and a second component that is capable of being evaporated to generate voids within said matrix, said first component comprising: (a) an unsaturated crosslinkable polymer, (b) a polymerizable acrylic monomer, (c) a thermoplastic polyurethane elastomer, and (d) a heat-activatable polymerization initiator.
Claim 40
Dependent Claim
16 words
A coating composition as claimed in claim 35 wherein said phosphor is europium-activated barium strontium sulfate.
Claim 41
Dependent Claim
32 words
A coating composition as claimed in claim 35 wherein said second component is an organic liquid having a normal boiling point in the range from about 40° C. to about 85° C.
Claim 42
Dependent Claim
16 words
A coating composition as claimed in claim 35 wherein said second component is methyl ethyl ketone.
Claim 43
Dependent Claim
33 words
A coating composition as claimed in claim 35 wherein said unsaturated crosslinkable polymer is an acrylated epoxy resin, said polymerizable acrylic monomer is butyl acrylate, and said heat-activatable polymerization initiator is 2,2'-azobis (isobutyronitrile).
References Cited (Backward Citations)
US4188449A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |