US4387152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-sensitive mixture and copying material prepared therefrom, and process for the preparation of a printing form from the copying material
Assignee: Hoechst AG
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Filing: 1981-10-20
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Granted: 1983-06-07
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Expires: 2001-10-20
Abstract
Abstract A light-sensitive mixture is disclosed which contains a water-insoluble, aqueous-alkali-soluble binder, a light-sensitive o- or p-quinone-diazide or a mixture of (a) a compound which generates or splits off an acid on exposure to light and (b) a compound having at least one C-O-C group which can be cleaved by acid, and a phenol compound having 1 to 3 benzene nuclei which are mutually linked by single bonds, carbonyl groups, ether groups, thioether groups or optionally substituted methylene groups, and having at least one phenolic hydroxyl group and at least two substituents of the formula -CH2OR, in which R is hydrogen or a lower alkyl or acyl group. The mixture is used for the preparation of light-sensitive copying material, preferably for the preparation of planographic printing forms. The addition of the phenolic compound has the effect that the developed printing forms can be baked at lower temperatures than hitherto in order to extend the printing run.
Inventors
- 👤 Paul Stahlhofen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:13
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/0045; G03F7/022
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
119 words
A light-sensitive mixture, comprising: a water-insoluble binder which is soluble in aqueous-alkaline solutions; a light-sensitive component selected from o- or p-quinone-diazides or a mixture of (a) a compound which generates or splits off an acid on exposure to light and (b) a compound having at least one C--O--C group which can be cleaved by acid; and a phenol derivative comprising a compound having from 1 to 3 benzene nuclei which are mutually linked by single bonds, carbonyl groups, ether groups, thioether groups or unsubstitutd or substituted methylene groups, and having at least one phenolic hydroxyl group and at least two substituents of the formula --CH 2 OR, in which R denotes hydrogen or a lower alkyl or acyl group.
Claim 2
Dependent Claim
119 words
A light-sensitive mixture, comprising: a water-insoluble binder which is soluble in aqueous-alkaline solutions; a light-sensitive component selected from o- or p-quinone-diazides or a mixture of (a) a compound which generates or splits off an acid on exposure to light and (b) a compound having at least one C--O--C group which can be cleaved by acid; and a phenol derivative comprising a compound having from 1 to 3 benzene nuclei which are mutually linked by single bonds, carbonyl groups, ether groups, thioether groups or unsubstitutd or substituted methylene groups, and having at least one phenolic hydroxyl group and at least two substituents of the formula --CH 2 OR, in which R denotes hydrogen or a lower alkyl or acyl group.
Claim 3
Dependent Claim
22 words
A light-sensitive mixture as claimed in claim 1, wherein the phenol derivative is substituted in the 4-position relative to the hydroxyl group.
Claim 4
Dependent Claim
93 words
A light-sensitive mixture as claimed in claim 1, wherein the phenol derivative comprises a compound of formula II ##STR2## in which X denotes a single bond or one of the groups S, O, CO or CR 1 R 2 and Y denotes hydrogen or a CH 2 OR group, R having the meaning given above, and R 1 and R 2 are identical or different and denote hydrogen or substituted or unsubstituted alkyl groups which can be linked together to form a ring, and wherein not more than two Y substituents are hydrogen.
Claim 5
Dependent Claim
25 words
A light-sensitive mixture as claimed in claim 2, wherein the phenol derivative is substituted by alkyl, alkoxy, cycloalkyl, aralkyl or acyl groups or by halogen.
Claim 6
Dependent Claim
16 words
A light-sensitive mixture as claimed in claim 1 or 3, wherein R is a hydrogen atom.
Claim 7
Dependent Claim
32 words
A light-sensitive mixture according to claim 1, wherein the phenol derivative is present in a quantity of from about 5 to 60% by weight, relative to the weight of non-volatile constituents therein.
Claim 8
Dependent Claim
16 words
A light-sensitive mixture as claimed in claim 1, wherein the light-sensitive compound comprises a 1,2-naphthoquinone-2-diazide derivative.
Claim 9
Dependent Claim
20 words
A light-sensitive mixture as claimed in claim 1, wherein the binder which is soluble in aqueous-alkaline solutions comprises a novolak.
Claim 10
Dependent Claim
25 words
A light-sensitive copying material, comprising: a support and light-sensitive layer on said support, said light-sensitive layer comprising a light-sensitive mixture as defined by claim 1.
Claim 11
Dependent Claim
16 words
A light-sensitive mixture as claimed in claim 3, wherein Y denotes a CH 2 OR group.
Claim 12
Dependent Claim
14 words
A light-sensitive mixture as claimed in claim 3, wherein X is a methylene group.
Claim 13
Dependent Claim
15 words
A light-sensitive mixture as claimed in claim 11 wherein X is a substituted methylene group.
Claim 14
Dependent Claim
12 words
A light-sensitive mixture as claimed in claim 12, wherein X is prop-2,2-ylene.
Claim 15
Dependent Claim
20 words
A light-sensitive mixture as claimed in claim 3, wherein said phenol derivative is selected from 2,2-bis-(4-hydroxy-3,5-bishydroxy-methyl-phenyl)propane; 1,1-bis-(4-hydroxy-3,5-bishydroxy-methyl-phenyl)-cyclohexane; bis-(4-hydroxy-3,5-bishydroxy-methyl-phenyl)-methane; or 2,2-bis-(4-hydroxy-3,5-bishydroxy-methyl-phenyl)-trichloroethane.
Claim 16
Dependent Claim
66 words
A light-sensitive mixture as claimed in claim 2, wherein the 4-position substituent is selected from an alkyl group having 1 to 12 carbon atoms, a cycloalkyl group having 5 to 8 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an aryl group having 6 to 10 carbon atoms, an aralkyl group having 7 to 10 carbon atoms, or a chlorine or bromine atom.
Claim 17
Dependent Claim
14 words
A light-sensitive mixture as claimed in claim 15, wherein said phenol derivative comprises 4-methyl-2,6-bis-hydroxymethyl-phenol.
Claim 18
Dependent Claim
172 words
A process for preparing a printing form comprising the steps of: imagewise exposing a light-sensitive copying material comprising a support and a light-sensitive layer on said support, said light-sensitive layer comprising a water-insoluble binder, which is soluble in aqueous-alkaline solutions, a light-sensitive component selected from o- or p-quinone diazides or a mixture of (a) a compound which generates or splits off an acid on exposure to light and (b) a compound having at least one C--O--C group which can be cleaved by acid, and a phenol derivative comprising a compound having 1 to 3 benzene nuclei which are mutually linked by single bonds, carbonyl groups, ether groups, thioether groups or unsubstituted or substituted methylene groups, and having at least one phenolic hydroxyl group and at least two substituents of the formula --CH 2 OR, in which R denotes hydrogen or a lower alkyl or acyl group; washing out the non-image areas with an aqueous-alkaline developer solution; and heating the developed printing form to an elevated temperature sufficient to harden the image layer.
Claim 19
Dependent Claim
172 words
A process for preparing a printing form comprising the steps of: imagewise exposing a light-sensitive copying material comprising a support and a light-sensitive layer on said support, said light-sensitive layer comprising a water-insoluble binder, which is soluble in aqueous-alkaline solutions, a light-sensitive component selected from o- or p-quinone diazides or a mixture of (a) a compound which generates or splits off an acid on exposure to light and (b) a compound having at least one C--O--C group which can be cleaved by acid, and a phenol derivative comprising a compound having 1 to 3 benzene nuclei which are mutually linked by single bonds, carbonyl groups, ether groups, thioether groups or unsubstituted or substituted methylene groups, and having at least one phenolic hydroxyl group and at least two substituents of the formula --CH 2 OR, in which R denotes hydrogen or a lower alkyl or acyl group; washing out the non-image areas with an aqueous-alkaline developer solution; and heating the developed printing form to an elevated temperature sufficient to harden the image layer.
Claim 20
Dependent Claim
27 words
A process as claimed in claim 17, wherein the developed printing form is heated to a temperature in the range of from about 150° to 240° C.
Claim 21
Dependent Claim
20 words
A process as claimed in claim 17, wherein the developed printing form is heated for about 1 to 20 minutes.
Claim 22
Dependent Claim
39 words
A process as claimed in claim 10, wherein the developed printing form is heated to a temperature in the range of from about 160° to 210° C. for a period of time of from about 5 to 15 minutes.
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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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |