Patent US4396703A successfully refreshed from Google Patents.
US4396703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retouching agent for lithographic printing plate
Assignee: Fujifilm Holdings Corp
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Filing: 1982-01-18
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Granted: 1983-08-02
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Expires: 2002-01-18
Abstract
Abstract A retouching agent for lithographic printing plate containing an admixture of (a) a lactone having 4 to 6 carbon atoms and (b) a glycol ether or ketone.
Inventors
- 👤 Hiroshi Matsumoto
- 👤 Shizuo Miyano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:20
CPC Classifications
B; B41; B41C; B41C1/00; B41C1/10; B41N; B41N3/00; B41N3/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
161 words
A process for retouching a lithographic printing plate which comprises applying to unwanted image area comprised of an imaged and developed o-quinonediazide compound, a retouching agent consisting essentially of (a) a lactone having 4 to 6 carbon atoms, (b) a glycol ether or a ketone, (d) an acidic substance to maintain a pH of about 1 to 5, (e) a water-soluble polymeric material, (f) a surfactant, (g) water, (i) and a viscosity-adjusting agent, having a pH of about 1 to 5, said glycol ether being selected from the group consisting of glycol monoalkyl ethers, diglycol monoalkyl ethers, triglycol monoalkyl ethers, ethylene glycol dialkyl ethers, and diethylene glycol dialkyl ethers, said ketone being selected from the group consisting of methyl butyl ketone, methyl isobutyl ketone, ethyl butyl ketone, butyrone, methyl amyl ketone, methyl hexyl ketone, valerone, mesityl oxide, diacetone alcohol, cyclohexanone, methylcyclohexanone, isophorone, acetylacetone and acetonylacetone, and the weight ratio of said component (a) to said component (b) being 2:1 to 1:3.
Claim 2
Dependent Claim
161 words
A process for retouching a lithographic printing plate which comprises applying to unwanted image area comprised of an imaged and developed o-quinonediazide compound, a retouching agent consisting essentially of (a) a lactone having 4 to 6 carbon atoms, (b) a glycol ether or a ketone, (d) an acidic substance to maintain a pH of about 1 to 5, (e) a water-soluble polymeric material, (f) a surfactant, (g) water, (i) and a viscosity-adjusting agent, having a pH of about 1 to 5, said glycol ether being selected from the group consisting of glycol monoalkyl ethers, diglycol monoalkyl ethers, triglycol monoalkyl ethers, ethylene glycol dialkyl ethers, and diethylene glycol dialkyl ethers, said ketone being selected from the group consisting of methyl butyl ketone, methyl isobutyl ketone, ethyl butyl ketone, butyrone, methyl amyl ketone, methyl hexyl ketone, valerone, mesityl oxide, diacetone alcohol, cyclohexanone, methylcyclohexanone, isophorone, acetylacetone and acetonylacetone, and the weight ratio of said component (a) to said component (b) being 2:1 to 1:3.
Claim 3
Dependent Claim
19 words
The process of claim 1, wherein said lactone is selected from the group consisting of butyrolactone, valerolactone, and hexanolactone.
Claim 4
Dependent Claim
10 words
The process of claim 2, wherein said lactone is γ-butyrolactone.
Claim 5
Dependent Claim
17 words
The process of claim 1, wherein component (b) has a boiling point of at least 140° C.
Claim 6
Dependent Claim
11 words
The process of claim 1 which additionally comprises an organic solvent.
Claim 7
Dependent Claim
34 words
The process of claim 5, wherein said solvent is selected from the group consisting of toluene, xylene, turpentine oil, n-heptane, solvent naphtha, and petroleum fractions boiling at temperatures of about 120° to 250° C.
Claim 8
Dependent Claim
30 words
The process of claim 1, wherein components (a) and (b) are present in a combined amount of about 15 to 100 wt% based on the total weight of the composition.
Claim 9
Dependent Claim
24 words
The process of claim 1, wherein said agent additionally comprises an acidic substance (b) whereby its pH is adjusted to about 1 to 3.
Claim 10
Dependent Claim
41 words
The process of claim 1, wherein said water-soluble polymeric material is selected from the group consisting of polyvinyl pyrrolidone, methyl cellulose, polyvinyl methyl ether, vinyl methyl ether/maleic anhydride copolymer, polyethylene glycol, polypropylene glycol, vinyl acetate/maleic anhydride copolymer and oxyethylene/oxypropylene block copolymer.
Claim 11
Dependent Claim
14 words
The process of claim 1, wherein said surfactant is an anionic or nonionic surfactant.
Claim 12
Dependent Claim
12 words
The process of claim 1 which additionally contains a coloring agent (h).
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) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |