# US 4,396,284 A · Apparatus for making lithographic printing plates

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- Number: US 4,396,284 A
- Document ID: US4396284A
- Status: Granted
- Kind: A
- Application number: 06/370,224
- Filed: 1982-04-20
- Granted: 1983-08-02
- Earliest claimed: 1978-12-22
- Assignees: Howard A. Fromson
- Inventors: Howard A. Fromson; Robert F. Gracia
- Web page: https://patentgrep.com/patent/US4396284A

## CPC

- G03F 7/30: Imagewise removal using liquid means
- G03F: PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR; (phototypographic composing devices B41B; photosensitive materials or processes for photographic purposes G03C; electrophotography, sensitive layers or processes therefor G03G)

## Abstract

Lithographic printing plates are made by exposing to actinic light a lithographic plate having a water soluble light sensitive layer thereon to form an image in said layer. A solvent soluble, UV curable material is adhered to the image in said layer. The plate is developed before or after applying the UV curable material. The plate is exposed to UV source having an intensity greater than the imaging light to form a press-ready plate having a durable, reinforced cured image thereon.

## Claims

### Claim 1

Process for making a lithographic printing plate which comprises:
(a) exposing to actinic light a lithographic plate having a water soluble light sensitive layer thereon to form at least a latent image in said layer;
(b) applying a solvent soluble UV curable material to the imaged plate from step (a);
(c) applying water to the plate from step (b) to remove light sensitive layer and UV curable material in the non-image areas leaving UV curable material adhered to the image in the light sensitive layer; and
(d) exposing the plate from step (c) to a UV source having an intensity greater than the imaging light used in step (a) to form a press-ready plate with a durable, reinforced cured image thereon.

### Claim 2 (depends on 1)

Process of claim 1 wherein the intensity and duration of the exposure in step (a) is sufficient to form a latent image in the light sensitive layer without completely curing same.

### Claim 3 (depends on 1)

Process of claim 1 wherein the water is applied to the imaged plate after step (a) and prior to step (b).

### Claim 4 (depends on 1)

Process of claim 1 which includes the step of coating the lithographic plate with a water soluble light sensitive material prior to step (a).

### Claim 5 (depends on 1)

Process of claim 1 wherein the intensity of the UV source is at least ten times greater than the imaging light used in step (a).

### Claim 6 (depends on 1)

Process of claim 1 wherein the image is formed in the light sensitive layer using a laser.

### Claim 7

Process for making a lithographic printing plate which comprises:
(a) exposing to actinic light a lithographic plate having a water soluble light sensitive layer thereon to form an image in said layer;
(b) developing the plate to remove the non-image areas from light sensitive layer;
(c) applying a solvent soluble UV curable material to the developed plate from step (b) and adhering said material to the image on said plate; and
(d) exposing the plate to a UV source having an intensity greater than the imaging light used in step (a) which is sufficient to cure the UV material adhered to the image to form a press-ready plate having a durable, reinforced cured image thereon.

### Claim 8 (depends on 7)

Process of claim 7 wherein the intensity and duration of the exposure in step (a) is sufficient to form a latent image in the light sensitive layer without completely curing same.

### Claim 9 (depends on 7)

Process of claim 7 wherein the intensity of the UV source is at least two times greater than the intensity of the actinic light used in step (a).

### Claim 10 (depends on 7)

Process of claim 7 wherein the image is formed in the light sensitive layer using a laser.

### Claim 11

Process for making a printed circuit which comprises:
(a) exposing to actinic light a composite laminate having a conductive layer and a water soluble light sensitive layer thereon to form at least a latent image in said light sensitive layer;
(b) applying a solvent soluble UV curable material to the imaged laminate from step (a);
(c) applying water to the liminate from step (b) to remove light sensitive layer and UV curable material in the non-image areas leaving UV curable material adhered to the image in the light sensitive layer and bare conductive layer in the non-image areas;
(d) exposing the plate from step (c) to a UV source having an intensity greater than the imaging light used in step (a); and
(e) removing conductive layer from the non-image areas.