US4701402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxidative imaging
Assignee: Eastman Kodak Co
•
Filing: 1985-12-30
•
Granted: 1987-10-20
•
Expires: 2005-12-30
Abstract
Abstract A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element comprising, as the image-forming components, an effective amount of a bleachable dye in reactive association with an iodonium ion. Suitable dyes include polymethine dyes having an oxidation potential between 0 and +1 volt.
Inventors
- 👤 Ranjan C. Patel
- 👤 Ian J. Ferguson
- 👤 Herbert J. Pennicott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:58
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/02
Claims Analysis
Total Claims: 38
Claim 1
Independent Claim
48 words
A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element consisting essentially of, as the image-forming components, an effective amount of a bleachable dye to provide an optical density of 1.0 or more in reactive association with an iodonium salt.
Claim 2
Dependent Claim
48 words
A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element consisting essentially of, as the image-forming components, an effective amount of a bleachable dye to provide an optical density of 1.0 or more in reactive association with an iodonium salt.
Claim 3
Dependent Claim
41 words
An element as claimed in claim 1, in which the bleachable dye is a polymethine dye or aza analogue having an oxidation potential between 0 and +1 volt and the image-forming components are both within a layer further comprising a binder.
Claim 4
Dependent Claim
20 words
An element as claimed in claim 2, in which the dye has an oxidation potential between +0.2 and +0.6 volt.
Claim 5
Dependent Claim
20 words
An element as claimed in claim 2, characterised in that the bleachable dye has the general formula: ##STR47## in which:
Claim 6
Dependent Claim
10 words
n 1 is an integer of 1 to 5, and
Claim 7
Dependent Claim
10 words
n 1 is an integer of 1 to 5, and
Claim 8
Dependent Claim
48 words
R 1 to R 4 are selected to provide an electron donor moiety at one end of the conjugated chain and an electron acceptor moiety at the other, the free valences on the chadin being satisfied by hydrogen or any substituent of the type used in cyanine dyes.
Claim 9
Dependent Claim
48 words
R 1 to R 4 are selected to provide an electron donor moiety at one end of the conjugated chain and an electron acceptor moiety at the other, the free valences on the chadin being satisfied by hydrogen or any substituent of the type used in cyanine dyes.
Claim 10
Dependent Claim
82 words
An element as claimed in claim 3, characterised in that R 1 to R 4 independently represent halogen, alkyl, aryl groups or heterocyclic rings any of which may be substituted, said groups containing up to 14 atoms selected from C, N, O and S; or R 1 and R 2 and/or R 3 and R 4 may represent the necessary atoms to complete optionally substituted aryl groups or heterocyclic rings, containing up to 14 atoms selected from C, N, O and S.
Claim 11
Dependent Claim
19 words
An element as claimed in claim 5, in which the bleachable dye is a cyanine, merocyanine or oxonol dye.
Claim 12
Dependent Claim
20 words
An element as claimed in claim 4, characterised in that the iodonium salt has the general formula: ##STR48## in which:
Claim 13
Dependent Claim
31 words
Ar 1 and Ar 2 independently represent carbocyclic or heterocyclic aromatic-type groups having from 4 to 20 carbon atoms, or together with the iodine atom complete a heterocyclic aromatic ring, and
Claim 14
Dependent Claim
31 words
Ar 1 and Ar 2 independently represent carbocyclic or heterocyclic aromatic-type groups having from 4 to 20 carbon atoms, or together with the iodine atom complete a heterocyclic aromatic ring, and
Claim 15
Dependent Claim
23 words
A.sup.⊖ represents any anion which does not react with the iodonium salt and may be present in Ar 1 or Ar 2 .
Claim 16
Dependent Claim
23 words
A.sup.⊖ represents any anion which does not react with the iodonium salt and may be present in Ar 1 or Ar 2 .
Claim 17
Dependent Claim
23 words
An element as claimed in claim 2, in which the weight ratio of bleachable dye to iodonium salt is from 1:1 to 1:50.
Claim 18
Dependent Claim
23 words
An element as claimed in claim 8, in which the weight ratio of bleachable dye to iodonium salt is from 1:2 to 1:10.
Claim 19
Dependent Claim
26 words
An element as claimed in claim 2, in which the image-forming components are present in one or more layers coated on the surface of a support.
Claim 20
Dependent Claim
25 words
An element as claimed in claim 10, in which the bleachable dye and iodonium salt are present in a layer which further comprises a binder.
Claim 21
Dependent Claim
29 words
An element as claimed in claim 11, in which the binder comprises from 50 to 98 percent by weight of the total weight of binder, dye and iodonium salt.
Claim 22
Dependent Claim
21 words
An element as claimed in claim 1, in the form of a self-supporting film comprising the image-forming components and a binder.
Claim 23
Dependent Claim
17 words
An element as claimed in claim 2, in which the element comprises cyan, magenta and yellow dyes.
Claim 24
Dependent Claim
24 words
An element as claimed in claim 14, which additionally comprises two further dyes having a peak absorbance at about 500 and 600 nm respectively.
Claim 25
Dependent Claim
39 words
An element comprising the combination of three light-sensitive elements as claimed in claim 2, a first element containing a bleachable cyan dye, a second element containing a bleachable magenta dye and a third element containing a bleachable yellow dye.
Claim 26
Dependent Claim
21 words
A method of recording a positive image comprising image-wise exposure to visible light of an element as claimed in claim 2.
Claim 27
Dependent Claim
44 words
A method as claimed in claim 17, which additionally comprises the step of stabilizing the exposed element by separation of the iodonium salt relative to the dye or destruction of the iodonium ion by disruption of at least one of the carbon-to-iodine bonds thereof.
Claim 28
Dependent Claim
21 words
A method as claimed in claim 18, in which the iodonium salt is removed by washing with water or solvent thereof.
Claim 29
Dependent Claim
25 words
A method as claimed in claim 18, in which the carbon-to-iodine bonds of the iodonium salt are disrupted by addition of ammonia or an amine.
Claim 30
Dependent Claim
36 words
A method as claimed in claim 18, in which the carbon-to-iodine bonds are disrupted by subjecting the element to heat or ultraviolet irradiation in the presence of a nucleophilic anion. in which M.sup.⊕ represents a cation.
Claim 31
Dependent Claim
54 words
A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element consisting essentially of, as the image-forming components within a layer, an effective amount of a bleachable dye to provide an optical density of 1.0 or more in reactive association with an iodonium salt within a binder.
Claim 32
Dependent Claim
54 words
A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element consisting essentially of, as the image-forming components within a layer, an effective amount of a bleachable dye to provide an optical density of 1.0 or more in reactive association with an iodonium salt within a binder.
Claim 33
Dependent Claim
12 words
The element of claim 22 wherein said layer is on a substrate.
Claim 34
Dependent Claim
78 words
The element of claim 23 wherein said bleachable dye has the general formula ##STR49## in which n is an integer of 1 to 5 and R 1 to R 4 are selected to provide an electron donor moiety at one end of the conjugated chain and an electron acceptor moiety at the other end of the conjugated chain, the free valences on the chain being satisfied by hydrogen or any substituent of the type used in cyanine dyes.
Claim 35
Dependent Claim
48 words
A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element consisting essentially of, as the image-forming components, an effective amount of a bleachable dye to provide an optical density between 1.4 and 4.3 in reactive association with an iodonium salt.
Claim 36
Dependent Claim
48 words
A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element consisting essentially of, as the image-forming components, an effective amount of a bleachable dye to provide an optical density between 1.4 and 4.3 in reactive association with an iodonium salt.
Claim 37
Dependent Claim
48 words
A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element consisting essentially of, as the image-forming components, an effective amount of a bleachable dye to provide an optical density of 3.0 or more in reactive association with an iodonium salt.
Claim 38
Dependent Claim
48 words
A radiation-sensitive element capable of recording an image upon image-wise exposure to radiation of selected wavelength, the element consisting essentially of, as the image-forming components, an effective amount of a bleachable dye to provide an optical density of 3.0 or more in reactive association with an iodonium salt.
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) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |