Claims
- 1. A negative-working lithographic printing plate comprising a soluble coating on a lithographic printing plate substrate wherein the coating has a composition:
a. which will react to imaging radiation selected from ultraviolet and visible radiation to insolubilize and image said coating in areas exposed to said imaging radiation; b. which contains an infrared radiation absorber whereby said coating may be heated by infrared radiation to increase the rate of imaging of said coating by said imaging radiation; and c. which is non-reactive to infrared radiation and heat whereby said coating is not insolubilized and imaged by said infrared radiation.
- 2. A lithographic printing plate as recited in claim 1 wherein said coating composition is a diazo resin.
- 3. A lithographic printing plate as recited in claim 1 wherein said coating composition is a photopolymer.
- 4. A negative-working lithographic printing plate comprising a lithographic printing plate substrate having a soluble coating thereon comprising a composition:
a. which is reactive to imaging radiation selected from ultraviolet and visible radiation to thereby insolubilize selected areas of said coating; b. which contains an infrared radiation absorber whereby said coating may be heated by infrared radiation thereby increasing the rate of the insolubilizing reaction of said selected areas of said coating by said imaging radiation; and c. which is non-reactive to infrared radiation and heat whereby said coating is not insolubilized by said infrared radiation.
- 5. A negative-working lithographic printing plate comprising a soluble coating on a substrate wherein the coating has a composition which will react to imaging radiation in the ultraviolet or visible range to insolubilize the imaged areas of the coating and wherein the coating composition contains an infrared absorber so that the coating may be heated by infrared radiation to increase the rate of the insolubilizing reaction and wherein the coating is not imaged and insolubilized by the infrared radiation.
Parent Case Info
[0001] This application is a continuation of U.S. patent application Ser. No. 09/746,954 filed Dec. 22, 2000, now abandoned, which is a continuation of U.S. patent application Ser. No. 09/653,726 filed Sep. 1, 2000, now U.S. Pat. No. 6,355,398, which is a continuation-in-part of U.S. patent application Ser. No. 09/482,483 filed Jan. 12, 2000, now abandoned.
Continuations (2)
|
Number |
Date |
Country |
Parent |
09746954 |
Dec 2000 |
US |
Child |
10244247 |
Sep 2002 |
US |
Parent |
09653726 |
Sep 2000 |
US |
Child |
09746954 |
Dec 2000 |
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09482483 |
Jan 2000 |
US |
Child |
09653726 |
Sep 2000 |
US |