Claims
- 1. A water-developable photosensitive resin plate for letterpress printing which comprises at least a base film, a photosensitive resin layer, a protective layer and a cover layer in this order, wherein said photosensitive layer contains a hydrophilic polymer in a sufficient amount to make the layer aqueous developable, has a thickness of 0.5 to 10 mm and said protective layer consists of at least two layers, of which one is a surface layer having a thickness in a range of 0.1 to 10 μm and containing a resin having a water absorption of 5% by weight or less and the other is an intermediate layer containing a water-soluble resin which is in contact with the photosensitive resin layer.
- 2. A photosensitive resin plate according to claim 1, wherein the intermediate layer further contains fine particles of a hydrophobic resin having a water absorption of 5% by weight or less and the weight ratio of the hydrophobic resin fine particles and the water-soluble resin is 95/5 or less.
- 3. A photosensitive resin plate according to claim 1 or 2, wherein the intermediate layer and/or the surface layer contains an ultraviolet absorber.
- 4. A photosensitive resin plate according to claim 2, wherein the hydrophobic resin fine particles have particle diameters of 5 μm or less.
- 5. A photosensitive resin plate according to claim 2, wherein the weight ratio of the hydrophobic resin fine particles and the water soluble resin is 85/15 to 20/80.
- 6. A photosensitive resin plate according to claim 1, wherein the water-soluble resin in the intermediate layer is selected from the group consisting of polyvinyl alcohol, polyvinylpyrrolidone, water-soluble nylon, sodium polyacrylate, polyacrylamide, polyethylene oxide, polyethyleneimine and water-soluble cellulose.
- 7. A photosensitive resin plate according to claim 1, wherein the thickness of the intermediate layer is in a range of 0.1 to 20 μm.
- 8. A photosensitive resin plate according to claim 1, wherein the surface layer has at least 30% by weight of the resin having a water absorption of 5% by weight or less.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-341898 |
Nov 1997 |
JP |
|
Parent Case Info
This application is the national phase under 35 U.S.C. §371 of PCT International Application No. PCT/JP98/05341 which has an International filing date of Nov. 27, 1998, which designated the United States of America.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/JP98/05341 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO99/28788 |
10/6/1999 |
WO |
A |
US Referenced Citations (7)
Number |
Name |
Date |
Kind |
4510227 |
Mohr er al. |
Apr 1985 |
A |
4957845 |
Isono et al. |
Sep 1990 |
A |
4970037 |
Kafka et al. |
Nov 1990 |
A |
5593811 |
Loerzer et al. |
Jan 1997 |
A |
6054249 |
Nagahara et al. |
Apr 2000 |
A |
6117621 |
Hatakeyama et al. |
Sep 2000 |
A |
6326132 |
Toya et al. |
Dec 2001 |
B1 |
Foreign Referenced Citations (12)
Number |
Date |
Country |
A2342650 |
Nov 1989 |
EP |
A5149803 |
Apr 1976 |
JP |
A5468224 |
Jun 1979 |
JP |
A56110941 |
Sep 1981 |
JP |
A263050 |
Mar 1990 |
JP |
A6127100 |
May 1994 |
JP |
A6127101 |
May 1994 |
JP |
A980744 |
Mar 1997 |
JP |
A9127688 |
May 1997 |
JP |
A9160225 |
Jun 1997 |
JP |
9-160226 |
Jun 1997 |
JP |
A9160226 |
Jun 1997 |
JP |
Non-Patent Literature Citations (1)
Entry |
Machine-Assisted English translation of JP 9-160226 (from Japan Patent Office), Jun. 20, 1997. |