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US4033948A
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Acutance agents for use in thermally-developable photosensitive compositions
Assignee: 3M Co
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Filing: 1976-05-17
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Granted: 1977-07-05
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Expires: 1996-05-17
Abstract
Abstract Certain members of the class of odd-numbered methine arylidene dye bases are found to be of use in thermally-developable photosensitive compositions and thermally-developable photosensitive elements containing such agents. These compounds are acutance agents which are relatively stable against photo-bleaching but undergo thermochemical bleaching on heating in silver salt-containing thermally-developable photosensitive compositions.
Inventors
- 👤 Harvey A. Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:16
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/825; G03C1/83; G03C1/832; C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/24; C07D213/54; C07D213/57; C07D215/00; C07D215/02; C07D215/12; C07D277/00; C07D277/60; C07D277/62; C07D277/64; C09; C09K; C09K19/00; C09K19/52; C09K19/60; C09K19/605
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A methine arylidene dye base represented by the formula: ##STR10## wherein: Z represents the atoms necessary to complete a mono- or polycyclic dihydroheterocyclic nucleus having 5 to 6 atoms in the ring including the N of the formula; R 1 is an alkyl, substituted alkyl, alkenyl or aryl group; m= 0 or 1; k= 0, 1 or 2; T 1 is an aprotic electron-withdrawing group having a σ para value of 0.45 to 0.63 selected from CF 3 and CN; T 2 is NO 2 ; and R 2 and R 3 are hydrogen or together constitute a condensed carbocyclic aromatic ring.
Claim 2
Dependent Claim
102 words
A methine arylidene dye base represented by the formula: ##STR10## wherein: Z represents the atoms necessary to complete a mono- or polycyclic dihydroheterocyclic nucleus having 5 to 6 atoms in the ring including the N of the formula; R 1 is an alkyl, substituted alkyl, alkenyl or aryl group; m= 0 or 1; k= 0, 1 or 2; T 1 is an aprotic electron-withdrawing group having a σ para value of 0.45 to 0.63 selected from CF 3 and CN; T 2 is NO 2 ; and R 2 and R 3 are hydrogen or together constitute a condensed carbocyclic aromatic ring.
Claim 3
Dependent Claim
42 words
A methine arylidene dye base according to claim 1 characterized by being an acutance agent wherein Z is a member of the group; --CH=CH--, --CH=CH--CH=CH--, ##STR11## where R 4 is H, alkyl of 1-2 carbon atoms or alkoxy of 1-2 carbon atoms.
Claim 4
Dependent Claim
18 words
An acutance agent according to claim 2 wherein R 1 is alkyl of 1 to 4 carbon atoms.
References Cited (Backward Citations)
US3652288A
Cited
GB1399751A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |