US4716098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer for preparing printing forms and process therefor
Assignee: Hoechst AG
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Filing: 1985-10-23
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Granted: 1987-12-29
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Expires: 2005-10-23
Abstract
Abstract A developer for negative-working reproduction layers and process therefor. The developer includes water, an organic solvent, a surface-active agent, an alkaline agent, a complexing agent, a buffer substance, an emulsifier and an n-alkanoic compound. Use of the developer suppresses speck and fibril formation in the developing process, and can be used in reproduction layers which optionally contain a binder.
Inventors
- 👤 Gerhard Mack
- 👤 Birgit Mueller
- 👤 Guenter Jung
- 👤 Werner Frass
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:19
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/26; G03F7/30; G03F7/32; G03F7/322
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
146 words
A developer mixture for developing a negative-working exposed reproduction layer provided on a base, said mixture comprising water; from about 0.5 to about 13.0% by weight of at least one organic solvent; at least one alkaline agent; about 0.5 to about 9.0% by weight of at least one complexing agent; from about 0.2 to about 12.0% by weight of at least one surface-active agent; from about 0.5 to about 10.0% by weight of at least one emulsifier; about 1.0 to about 7.0% by weight of at least one n-alkanoic compound; and from about 0.5 to about 20.0% by weight of at least one buffer substance, said percentages by weight being based on the total weight of said developer mixture, wherein (A) said surface-active agent has an anionic structure and (B) said n-alkanoic compound is selected from an n-alkanoic acid, an n-alkanoic acid salt, and mixture thereof.
Claim 2
Dependent Claim
146 words
A developer mixture for developing a negative-working exposed reproduction layer provided on a base, said mixture comprising water; from about 0.5 to about 13.0% by weight of at least one organic solvent; at least one alkaline agent; about 0.5 to about 9.0% by weight of at least one complexing agent; from about 0.2 to about 12.0% by weight of at least one surface-active agent; from about 0.5 to about 10.0% by weight of at least one emulsifier; about 1.0 to about 7.0% by weight of at least one n-alkanoic compound; and from about 0.5 to about 20.0% by weight of at least one buffer substance, said percentages by weight being based on the total weight of said developer mixture, wherein (A) said surface-active agent has an anionic structure and (B) said n-alkanoic compound is selected from an n-alkanoic acid, an n-alkanoic acid salt, and mixture thereof.
Claim 3
Dependent Claim
18 words
The developer as claimed in claim 1, wherein said n-alkanoic compound has from 8 to 12 carbon atoms.
Claim 4
Dependent Claim
24 words
The developer as claimed in claim 1, wherein the n-alkanoic compound content in said mixture is from about 1.5 to about 6.0% by weight.
Claim 5
Dependent Claim
27 words
The developer as claimed in claim 1, wherein said complexing agent is present in said mixture in amounts of from about 1.0 to about 4.0% by weight.
Claim 6
Dependent Claim
28 words
The developer as claimed in claim 1, wherein said anionic surface-active agent is present in said mixture in amounts of from about 1.0 to about 8.0% by weight.
Claim 7
Dependent Claim
26 words
The developer as claimed in claim 1, wherein said emulsifier is present in said mixture in amounts of from about 1.0% to about 6.0% by weight.
Claim 8
Dependent Claim
27 words
The developer as claimed in claim 1, wherein said organic solvent is present in said mixture in amounts of from about 1.0 to about 8.0% by weight.
Claim 9
Dependent Claim
26 words
The developer as claimed in claim 1, wherein said buffer is present in said mixture in amounts of from about 1.0 to about 10.0% by weight.
Claim 10
Dependent Claim
24 words
The developer as claimed in claim 1, wherein said n-alkanoic compound is selected from the group consisting of caprylic, pelargonic, capric and lauric acid.
Claim 11
Dependent Claim
38 words
The developer as claimed in claim 1, wherein said at least one complexing agent is selected from the group consisting of a polyphosphate, an alkali metal salt of nitrilotriacetic acid and an alkali metal salt of ethylenediaminetetraacetic acid.
Claim 12
Dependent Claim
13 words
The developer as claimed in claim 1, wherein said polyphosphate is a metaphosphate.
Claim 13
Dependent Claim
53 words
The developer as claimed in claim 1, wherein said at least one anionic surface-active agent is selected from the group consisting of an alkali octylsulfate, an alkali metal salt of dodecylsulfonic acid, an alkylphenol ether sulfate, an alkali sulfosuccinate, an alkyl ether phosphate, an alkali oleic acid methyl tauride and a condensed naphthalenesulfonate.
Claim 14
Dependent Claim
12 words
The developer as claimed in claim 12, wherein said alkali is sodium.
Claim 15
Dependent Claim
34 words
The developer as claimed in claim 1, wherein said at least one organic solvent is selected from the group consisting of benzyl alcohol, ethylene glycol monophenyl ether, 1-phenylethanol, 2-phenylethanol and propylene glycol monomethyl ether.
Claim 16
Dependent Claim
34 words
The developer as claimed in claim 1, wherein said at least one emulsifier is selectedfrom the group consisting of poly-N-vinyl-N-methylacetamide, a water-soluble copolymer of N-vinyl-N-methylacetamide, polyvinyl alcohol, dextrine, gum arabic and a cellulose ether.
Claim 17
Dependent Claim
13 words
The developer as claimed in claim 15, wherein said cellulose ether is carboxymethylcellulose.
Claim 18
Dependent Claim
37 words
The developer as claimed in claim 1, wherein said buffer is selected from the group consisting of a carbonate, a phosphate, a borate, and an alkali metal salt of glycine and anamine, and combinations of the above.
Claim 19
Dependent Claim
18 words
The developer as claimed in claim 17, wherein said amine is selected from a diethanolamine and a triethanolamine.
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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) | 1990-12-28 | 1991-06-29 | 1991-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-28 | 1995-06-29 | 1995-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-28 | 1999-06-29 | 1999-12-29 | $7700.00 | Window Closed / Lapsed |