# US 4,170,687 A · Planographic printing plate for dry printing

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- Number: US 4,170,687 A
- Document ID: US4170687A
- Status: Granted
- Kind: A
- Application number: 05/837,864
- Filed: 1977-09-29
- Granted: 1979-10-09
- Earliest claimed: 1976-09-30
- Assignees: Gestetner Limited
- Inventors: Leonard A. Spicer; Derek J. McGee; Ian H. Elson
- Web page: https://patentgrep.com/patent/US4170687A

## CPC

- B41N 1/003: {with ink abhesive means or abhesive forming means, such as abhesive siloxane or fluoro compounds, e.g. for dry lithographic printing}
- G03G 13/286: {for dry lithography}
- B41C 2210/16: Waterless working, i.e. ink repelling exposed (imaged) or non-exposed (non-imaged) areas, not requiring fountain solution or water, e.g. dry lithography or driography
- Y10S 428/914: Transfer or decalcomania
- Y10T 428/3154: Of fluorinated addition polymer from unsaturated monomers
- Y10T 428/31576: Ester monomer type [polyvinylacetate, etc.]
- Y10T 428/3158: Halide monomer type [polyvinyl chloride, etc.]
- Y10T 428/31591: Next to cellulosic
- B41N: PRINTING PLATES OR FOILS (photosensitive material G03); MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- B41C: PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES (photomechanical processes for producing printing surfaces G03F; photoelectrical processes for producing printing surfaces G03G)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Planographic printing plates for use without fountain solution, and especially suitable for imaging with an electrophotographic toner, have a surface containing a fluorinated polyurethane. In use only the image areas accept ink.

## Claims

### Claim 1

A planographic printing plate comprising a support sheet having an ink-repellent coating containing 0.5 to 15%, by weight of the said coating, of a fluorinated polyurethane obtained by reaction of a fluorinated polyol and a non-fluorinated polyol with a polyisocyanate, and the balance to 100% of a non-fluorinated film-forming synthetic resinous material.

### Claim 2 (depends on 1)

A plate according to claim 1 in which the said coating contains 1 to 6% by weight of the said polyurethane.

### Claim 3 (depends on 1)

A plate according to claim 1 in which the said non-fluorinated synthetic resinous material is polyvinyl acetate, polyvinyl chloride, polyvinyl chloride/acetate copolymer, nitrocellulose, or polyvinyl butyral.

### Claim 4 (depends on 1)

A plate according to claim 1 in which the said coating weighs 5 to 15 grams per sq. meter.

### Claim 5 (depends on 1)

A plate according to claim 1 in which the support sheet is a sheet of highly calendered Kraft paper carrying a layer of china clay dispersed in casein or sodium carboxymethylcellulose.

### Claim 6 (depends on 1)

A plate according to claim 1 in which the polyurethane also contains radicals imparting affinity for the toner image.

### Claim 7 (depends on 6)

A plate according to claim 6 in which the said radicals are styrene residues.

### Claim 8 (depends on 1)

A plate according to claim 1 in which the said polyurethane contains residues in approximately stoichiometric proportions of (1) a polyol component comprising 50 to 90% by weight of a fluoro-compound of the formula:
R.sub.f --(CH.sub.2).sub.m --(OC.sub.6 H.sub.4).sub.n --A--n(RX).sub.2
in which R.sub.f is a perfluoroaliphatic radical of at least 3 carbon atoms, m is 0, 1, or 2, n is 0 or 1, A is --SO.sub.2 -- or --CO--, R is alkylene of 2 to 10 carbon atoms, and X is --OH or --NH.sub.2 and 50 to 10% by weight of a non-fluorinated polyol, and (2) a polyisocyanate.

### Claim 9 (depends on 8)

A plate according to claim 8 in which, in the said fluoro-compound, R.sub.f is perfluoroalkenyl of 8, 10, 12, 14, or 16 carbon atoms, m is 0, n is 1, A is --SO.sub.2 --, R is ethylene, and X is OH.

### Claim 10 (depends on 8)

A plate according to claim 8 in which, in the said fluoro-compound, R.sub.f is perfluoroalkyl of 3 to 15 carbon atoms, m is 0, n is 0, A is --SO.sub.2 --, R is alkylene of 2 to 4 carbon atoms, and X is --OH or --NH.sub.2.

### Claim 11 (depends on 8)

A plate according to claim 8 in which the said polyisocyanate is 4,4'-diphenylmethane diisocyanate or tolylene diisocyanate.

### Claim 12 (depends on 8)

A plate according to claim 8 in which the said non-fluorinated polyol contains a styrene copolymer polyol.

### Claim 13 (depends on 12)

A plate according to claim 12 in which the said non-fluorinated polyol is a mixture of a diol of formula:
R.sub.1 --N(CH.sub.2 CH.sub.2 OH).sub.2
where R.sub.1 is alkyl of 8 to 18 carbon atoms and a styrene-butadiene copolymer polyol.