Positive acting composition yielding pre-development high visibility image after radiation exposure comprising acid free novolak, diazo oxide and acid sensitive dyestuff
US4348471A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 15, 1981 |
| Grant date | Sep 7, 1982 |
| Priority date | — |
| Expiry date | Jun 15, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A colored, positive-acting, radiation-sensitive composition whose color is extinguished or greatly decreased in intensity upon irradiation comprising at least one acid-free resin, at least one acid-sensitive dyestuff and at least one positive-acting component which yields an acidic product upon irradiation; positive-acting elements comprising suitable support materials at least one surface of which has been coated with the above composition and lithographic printing plates comprising the above elements, wherein the support materials are lithographically suitable support materials, which have been imagewise exposed to radiation wherein there is a high contrast, before development, between the colored image areas and less intensely colored or colorless non-image areas, the image areas of said plates being additionally highly stable against aqueous alkaline developers after development to remove the exposed non-image areas of the composition and more highly colored than the non-image areas of the revealed substrate surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.