# US 5,705,310 A · Flexographic printing plate

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- Number: US 5,705,310 A
- Document ID: US5705310A
- Status: Granted
- Kind: A
- Application number: 08/574,486
- Filed: 1995-12-19
- Granted: 1998-01-06
- Earliest claimed: 1995-05-01
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Carol Marie Van Zoeren
- Web page: https://patentgrep.com/patent/US5705310A

## CPC

- G03F 7/202: {Masking pattern being obtained by thermal means, e.g. laser ablation}
- Y10S 428/913: Material designed to be responsive to temperature, light, moisture
- Y10S 430/145: Infrared
- Y10S 430/165: Thermal imaging composition
- 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)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

This invention relates to a process for making a flexographic printing plate from a photosensitive printing element having an infrared reduction ablatable layer capable of being selectively removed by a laser beam and wherein the process includes placing a material capture sheet in proximity to a photopolymer layer.

## Claims

### Claim 1

A material capture element for capturing debris from laser ablated areas of a photosensitive printing element, the material capture element comprising:
(1) an infrared-sensitive transparent photopolymerizable layer disposed adjacent an infrared-sensitive transparent support, said photopolymerizable layer having at least one elastomeric binder, at least one monomer and an initiator having sensitivity to non-infrared actinic radiation;
(2) at least one layer of infrared radiation sensitive material having at least one self-ablative binder disposed adjacent the photopolymerizable layer, said infrared radiation sensitive layer being substantially opaque to non-infrared actinic radiation; and
(3) a material capture sheet disposed adjacent the infrared radiation sensitive layer, the material capture sheet comprising a material capture support selected from the group consisting of paper and polymeric film, and a layer applied to the material capture support comprising:
(i) an adhesive which is thermally activated upon exposure to infrared laser radiation; and
(ii) an infrared absorbing agent to facilitate the thermal activation of the adhesive and thereby aid in capture of the debris.

### Claim 2 (depends on 1)

The element of claim 1, wherein the infrared absorbing agent (ii) is carbon black.

### Claim 3 (depends on 1)

The element of claim 1, wherein the infrared absorbing agent (ii) is present in an amount of 0.1% to 10% by weight of the adhesive.

### Claim 4 (depends on 1)

The material capture element of claim 1 wherein the material capture support is a polymeric film having a roughened surface.

### Claim 5 (depends on 1)

A material capture element according to claim 1 further comprising debris on the material capture sheet wherein the debris is material which has been ablated from the infrared radiation sensitive layer.

### Claim 6 (depends on 1)

The element of claim 1, wherein the layer applied to the material capture support further comprises a matte agent.