US4637898A
Expired / Lapsed
US
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Fluorescent compositions, x-ray intensifying screens, and processes for making same
Assignee: Eastman Kodak Co
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Filing: 1985-04-08
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Granted: 1987-01-20
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Expires: 2005-04-08
Abstract
Abstract An x-ray intensifying screen comprises a support having thereon a fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said support having an index of refraction up to or equal to 0.05 units higher than the index of refraction of said phosphor and having a reflection optical density of at least 1.7 to light emitted by said phosphor. The screen is highly transparent, and further exhibits improved contrast and resolution. A preferred fluorescent composition useful in the x-ray intensifying screen comprises: (a) from 50 to 90 percent by weight of a substantially isotropic phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction with 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 99 mole percent of recurring units having the formula: ##STR1## wherein: R 1 is H or alkyl; and R 2 is alkyl, cycloalkyl, aryl, aralkyl or aryl substituted with alkyl, alkoxy or heterocyclic; and (ii) from 1 to 95 mole percent of recurring units having the formula: ##STR2## wherein: Ar is arylene; R 1 is H or alkyl; R 3 is H, alkyl, aryl, or aralkyl; and R 4 is H, alkyl, alkoxy, amino, halogen, sulfide, sulfoxide, sulfonate or heterocyclic.
Inventors
- 👤 Charles D. DeBoer
- 👤 George W. Luckey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:21
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
105 words
A fluorescent coating composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 99 mole percent of a polymerized co-polymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 1 to 95 mole percent of a polymerized co-polymerizable naphthyl carbinyl thioacrylate monomer.
Claim 2
Dependent Claim
105 words
A fluorescent coating composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 99 mole percent of a polymerized co-polymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 1 to 95 mole percent of a polymerized co-polymerizable naphthyl carbinyl thioacrylate monomer.
Claim 3
Dependent Claim
14 words
The fluorescent composition of claim 1 wherein said phosphor is an alkali metal compound.
Claim 4
Dependent Claim
19 words
The fluorescent composition of claim 1 wherein said phosphor is selected from the group consisting of RbI:Tl and KI:Tl.
Claim 5
Dependent Claim
103 words
A fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic alkali metal phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 99 mole percent of recurring units having the formula: ##STR11## (ii) from 1 to 95 mole percent of recurring units having the formula: ##STR12##
Claim 6
Dependent Claim
103 words
A fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic alkali metal phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 99 mole percent of recurring units having the formula: ##STR11## (ii) from 1 to 95 mole percent of recurring units having the formula: ##STR12##
Claim 7
Dependent Claim
19 words
The fluorescent composition of claim 3 wherein said phosphor is selected from the group consisting of RbI:Tl and KI:Tl.
Claim 8
Dependent Claim
151 words
An x-ray intensifying screen comprising a support having thereon a fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of the phosphor, said polymer comprising: (i) from 5 to 100 mole percent of polymerized co-polymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of a polymerized co-polymerizable naphthyl carbinyl thioacrylate monomer; said support having an index of refraction equal to or up to 0.05 units higher than the index of refraction of said phosphor and having a reflection optical density of at least 1.7 to light emitted by said phosphor.
Claim 9
Dependent Claim
151 words
An x-ray intensifying screen comprising a support having thereon a fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of the phosphor, said polymer comprising: (i) from 5 to 100 mole percent of polymerized co-polymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of a polymerized co-polymerizable naphthyl carbinyl thioacrylate monomer; said support having an index of refraction equal to or up to 0.05 units higher than the index of refraction of said phosphor and having a reflection optical density of at least 1.7 to light emitted by said phosphor.
Claim 10
Dependent Claim
15 words
The x-ray intensifying screen of claim 6 wherein said phosphor is an alkali metal compound.
Claim 11
Dependent Claim
20 words
The x-ray intensifying screen of claim 7 wherein said phosphor is selected from the group consisting of RbI:Tl and KI:Tl.
Claim 12
Dependent Claim
16 words
The x-ray intensifying screen of claim 6 wherein said support comprises a black anodized aluminum surface.
Claim 13
Dependent Claim
160 words
An x-ray intensifying screen comprising a support having thereon a fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic alkali metal phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction without 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 100 mole percent of a polymerized copolymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of a polymerized copolymerizable naphthyl carbinyl thioacrylate monomer; said support comprising a black anodized aluminum surface having an index of refraction equal to or up to 0.05 units higher than the index of refraction of said phosphor and having a reflection optical density of at least 1.7 to light emitted by said phosphor.
Claim 14
Dependent Claim
160 words
An x-ray intensifying screen comprising a support having thereon a fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic alkali metal phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction without 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 100 mole percent of a polymerized copolymerizable naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of a polymerized copolymerizable naphthyl carbinyl thioacrylate monomer; said support comprising a black anodized aluminum surface having an index of refraction equal to or up to 0.05 units higher than the index of refraction of said phosphor and having a reflection optical density of at least 1.7 to light emitted by said phosphor.
Claim 15
Dependent Claim
20 words
The x-ray intensifying screen of claim 10 wherein said phosphor is selected from the group consisting of RbI:Tl and KI:Tl.
Claim 16
Dependent Claim
27 words
The x-ray intensifying screen of claim 10 wherein said naphthyl carbinyl methacrylate monomer is 1-naphthyl carbinyl methacrylate and wherein said naphthyl carbinyl thioacrylate monomer is S-(1-naphthyl carbinyl)thioacrylate.
Claim 17
Dependent Claim
165 words
An x-ray intensifying screen comprising a support havihg thereon a fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic alkali metal phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor, selected from the group consisting of RbI:Tl and KI:Tl; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 100 mole percent of polymerized 1-naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of polymerized S-(1-naphthyl carbinyl) thioacrylate monomer; said support comprising a black anodized aluminum surface having an index of refraction equal to or up to 0.05 units higher than the index of refraction of said phosphor and having a reflection optical density of at least 1.7 to light emitted by said phosphor.
Claim 18
Dependent Claim
165 words
An x-ray intensifying screen comprising a support havihg thereon a fluorescent composition comprising: (a) from 50 to 90 percent by weight of a substantially isotropic alkali metal phosphor which is excited by x-rays and substantially transparent to light emitted by said phosphor, selected from the group consisting of RbI:Tl and KI:Tl; and (b) from 10 to 50 percent by weight of a polymer having an index of refraction within 0.02 of the index of refraction of said phosphor over at least 80 percent of the emission spectrum of said phosphor, said polymer comprising: (i) from 5 to 100 mole percent of polymerized 1-naphthyl carbinyl methacrylate monomer; and (ii) from 0 to 95 mole percent of polymerized S-(1-naphthyl carbinyl) thioacrylate monomer; said support comprising a black anodized aluminum surface having an index of refraction equal to or up to 0.05 units higher than the index of refraction of said phosphor and having a reflection optical density of at least 1.7 to light emitted by said phosphor.
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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) | 1990-01-19 | 1990-07-21 | 1991-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-19 | 1994-07-21 | 1995-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-19 | 1998-07-21 | 1999-01-20 | $7700.00 | Window Closed / Lapsed |