Patent US4863835A successfully refreshed from Google Patents.
US4863835A
Expired / Lapsed
US
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Developer composition for lithographic printing plates
Assignee: Mitsubishi Chemical Corp
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Filing: 1982-11-08
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Granted: 1989-09-05
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Expires: 2002-11-08
Abstract
Abstract A developer composition for a lithographic printing plate provided with a coated layer composed of a photosensitive polymer having in the main chain thereof groups of formula (I) <IMAGE> (I) wherein X and Y independently represent hydrogen, halogen, cyano or nitro and n is an integer of 1 or 2, comprising: (A) benzyl alcohol, (B) tetrahydrofurfuryl alcohol and (C) at least one acid selected from the group consisting of a mineral acid, an organic carboxylic acid and an organic sulfonic acid.
Inventors
- 👤 Shigeki Shimizu
- 👤 Akinobu Oshima
- 👤 Hiroshi Ide
- 👤 Noriaki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:57
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
A method of developing an image in a light exposed photosensitive coating of a lithographic printing plate, said coating consisting of a photosensitive polyester prepared by polycondensing at least one polycarboxylic acid or ester thereof containing within its structure at least one radical of the formula: ##STR3## wherein X and Y independently represent hydrogen, halogen, cyano or nitro, and n is an integer of 1 to 2, with at least one polyhydric alcohol, consisting of: washing the unexposed portions of said exposed photosensitive coating from said plate with a developer solution consisting of: (a) from 5-90 wt.% benzyl alcohol, (b) from 5-90 wt.% tetrahydrofurfuryl alcohol, (c) from 0.1-15 wt.% of at least one acid selected from the group consisting of a mineral acid, an organic carboxylic acid and an organic sulfonic acid and (d) from 0.1 to 25% by weight water.
Claim 2
Independent Claim
141 words
A method of developing an image in a light exposed photosensitive coating of a lithographic printing plate, said coating consisting of a photosensitive polyester prepared by polycondensing at least one polycarboxylic acid or ester thereof containing within its structure at least one radical of the formula: ##STR3## wherein X and Y independently represent hydrogen, halogen, cyano or nitro, and n is an integer of 1 to 2, with at least one polyhydric alcohol, consisting of: washing the unexposed portions of said exposed photosensitive coating from said plate with a developer solution consisting of: (a) from 5-90 wt.% benzyl alcohol, (b) from 5-90 wt.% tetrahydrofurfuryl alcohol, (c) from 0.1-15 wt.% of at least one acid selected from the group consisting of a mineral acid, an organic carboxylic acid and an organic sulfonic acid and (d) from 0.1 to 25% by weight water.
Claim 3
Dependent Claim
30 words
The method of claim 1, wherein said polycarboxylic acid is p-phenylenediacrylic acid, p-carboxycinnamic acid, bis-(p-carboxybenzal)cyclohexanone, bis(p-carboxybenzal)cyclopentanone, bis(p-carboxycinnamoyl)benzene, p,p'-chalconedicarboxylic acid, fumaric acid, maleic acid, succinic acid, adipic acid or terephthalic acid.
Claim 4
Dependent Claim
34 words
The method of claim 1, wherein said polyhydric alcohol is ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, 1,3-propanediol, hydrogenated bisphenol A, hydrogenated bisphenol F, bis(β-hydroxyethoxy)cyclohexane or p,p'-dihydroxychalcone.
Claim 5
Dependent Claim
13 words
The method of claim 1, wherein said acid (c) is a mineral acid.
Claim 6
Dependent Claim
12 words
The method of claim 4, wherein said mineral acid is phosphoric acid.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein the content of tetrahydrofurfuryl alcohol in the developer ranges from 10 to 40% by weight.
Claim 8
Dependent Claim
19 words
The method of claim 1, wherein the content of benzyl alcohol in the developer ranges from 30 to 70%.
Claim 9
Dependent Claim
18 words
The method of claim 1, wherein said acid component (C) is benzene sulfonic acid or p-toluene sulfonic acid.
Claim 10
Dependent Claim
20 words
The method of claim 1, wherein said acid component (C) is acetic acid, lactic acid, glycolic acid, or α-pentenoic acid.
Claim 11
Dependent Claim
14 words
The method of claim 1, wherein the developer solution has a pH of 1-6.
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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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |