US3779759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lithographic printing plates with lacquer of resole-epoxy resin combination
Assignee: EIDP Inc
•
Filing: 1971-08-17
•
Granted: 1973-12-18
•
Expires: 1991-08-17
Abstract
Abstract A lacquer for lithographic printing plate production comprises a resinous material dissolved in an organic solvent. The resinous material comprises at least equivalent proportions of a resol resin and an epoxy resin and additional resol resin. The resol resin and the epoxy resin may be present as a mixture or they may be precondensed together. The lacquer readily accepts printing ink and may be stoved.
Inventors
- 👤 L Lawson
- 👤 P Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:28
CPC Classifications
C; C08; C08L; C08L63/00; B; B41; B41N; B41N3/00; B41N3/08; C09; C09D; C09D161/00; C09D161/04; C09D161/06; C09D163/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
23 words
Process according to claim 1, and comprising the additional step of etching the revealed areas of the support prior to applying the lacquer.
Claim 2
Dependent Claim
15 words
Process according to claim 1 and comprising the additional step of heating the printing image.
Claim 3
Dependent Claim
129 words
Process for producing a lithographic printing plate, which comprises the steps of: a. image-wise exposing a pre-sensitized light-sensitive plate comprising a support coated with a light sensitive layer, b. developing the image-wise exposed layer selectively to remove the relatively more soluble areas of the image-wise exposed layer, and c. applying a lacquer to the less soluble areas of the image-wise exposed layer remaining on the support to form a printing image, said lacquer comprising a resinous material dissolved in an organic solvent and said resinous material being a resol resin/epoxy resin mixture wherein the proportion of resol resin in the mixture is such that the number of hydroxyl groups contributed by the resol resin is at least equal to the number of epoxy groups contributed by the epoxy resin.
Claim 4
Dependent Claim
15 words
Process according to claim 4, and comprising the additional step of heating the printing image.
Claim 5
Dependent Claim
13 words
Process according to claim 3, wherein the lacquer additionally includes a novolac resin.
Claim 6
Dependent Claim
31 words
Process according to claim 1, wherein said resinous material comprises from 20 to 70 percent by weight of epoxy resin and from 80 to 30 percent by weight of resol resin.
Claim 7
Dependent Claim
22 words
Process according to claim 1, wherein some or all of the resol resin and epoxy resin in the mixture are condensed together.
Claim 8
Dependent Claim
13 words
Process according to claim 5, wherein the lacquer additionally includes a novolac resin.
Claim 9
Dependent Claim
31 words
Process according to claim 4, wherein said resinous material comprises from 20 to 70 percent By weight of epoxy resin and from 80 to 30 percent by weight of resol resin.
Claim 10
Dependent Claim
21 words
Process according to claim 4, wherein the organic solvent is water immersible and wherein the lacquer includes an aqueous desensitizing phase.
Claim 11
Dependent Claim
23 words
Process according to claim 4, wherein some or all of the resol resin and the epoxy resin in the mixture are consensed together.
References Cited (Backward Citations)
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Cited
US3514288A
Cited
US3651170A
Cited
US3459128A
Cited
US3455688A
Cited
US3669664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |