Claims
- 1. A light-sensitive lithographic printing plate which comprises an aluminum or aluminum alloy support having been pretreated and a light-sensitive layer provided thereon, wherein the surface of the support adjacent to the light-sensitive layer is anodized, following by being treated with an aqueous solution containing 0.001 to 10% by weight based on the aqueous solution, of a nitrile selected from the group consisting of NaNO.sub.2 and KNO.sub.2.
- 2. The light-sensitive lithographic printing plate according to claim 1, wherein the amount of nitrite is 0.01 to 2% by weight based on the aqueous solution.
- 3. The light-sensitive lithographic printing plate according to claim 2, wherein the amount of nitrite is 0.05 to 1% by weight based on the aqueous solution.
- 4. The light-sensitive lithographic printing plate according to claim 1, wherein the treatment by using the aqueous solution is carried out by dipping the support into the aqueous solution within a temperature range from a room temperature to about 100.degree. C. for 15 to 300 seconds, or coating the aqueous solution onto the support.
- 5. The light-sensitive lithographic printing plate according to claim 4, wherein the treatment by using the aqueous solution is carried out by dipping the support into the aqueous solution within a temperature range from 50.degree. to 80.degree. C. for 30 to 180 seconds.
- 6. The light-sensitive lithographic printing plate according to claim 5, wherein the treatment by using the aqueous solution is carried out by dipping the support into the aqueous solution within a temperature range from 70.degree. to 80.degree. C. for 50 to 80 seconds.
- 7. The light-sensitive lithographic printing plate according to claim 1 wherein the nitrite is NaNO.sub.2.
- 8. The light-sensitive lithographic printing plate according to claim 1 wherein the nitrite is KNO.sub.2.
- 9. The light-sensitive lithographic printing plate according to claim 6 wherein the nitrite is NaNO.sub.2.
- 10. The light-sensitive lithographic printing plate according to claim 6 wherein the nitrite is KNO.sub.2.
Priority Claims (3)
Number |
Date |
Country |
Kind |
63-312980 |
Dec 1988 |
JPX |
|
1-35540 |
Feb 1989 |
JPX |
|
1-90946 |
Apr 1989 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/446,197, filed Dec. 5, 1989, (abandoned).
US Referenced Citations (7)
Foreign Referenced Citations (5)
Number |
Date |
Country |
105170 |
Apr 1984 |
EPX |
3120975 |
Dec 1982 |
DEX |
2267888 |
Nov 1975 |
FRX |
2284902 |
Apr 1976 |
FRX |
349595 |
Jul 1977 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
446197 |
Dec 1989 |
|