Light sensitive element and process for recording images thereon

Claim 1

A PRINTING PROCESS INCLUDING THE STEPS OF (A) PROVIDING A RECORDING WEB HAVING A PRESSURERUPTURABLE COATING CONTAINING DROPLETS OF A SOLUTION CONSISTING OF A VOLATILE SOLVENT AND A COLORFORMING MATERIAL HAVING A NORMALLY COLORLESS-STATE BUT WHICH MATERIAL WHEN EXPOSED TO ULTRA-VIOLET LIGHT WHILE IN SOLUTION TURNING TO A DISTINCTIVELY COLOREDSTATE, AND SAID MATERIAL BEING FIXED AGAINST CHANGE FROM THE COLORLESS-STATE TO THE COLORED-STATE BY INCIDENT ULTRA-VIOLET LIGHT WHEN IN SOLID FORM SO THAT THE COLORED-STATE PERSISTS IN THE RESIDUAL MATERIAL IF THE SOLVENT EVAPORATES LEAVING A SOLID FORM THEREOF, SAID MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF INDOLINO-PYRYLOSPIRAN COMPOUNDS AND XANTHYLIDENE-ANTHRONE COMPOUNDS, AND THE SAID COATING BEING PENETRABLE BY ULTRA-VIOLET LIGHT; (B) SUBJECTING THE COATING TO ULTRA-VIOLET LIGHT IN DATAREPRESENTING PATTERNS TO DEPICT SAID DATA-REPRESENTING PATTERNS ON THE COATED WEB IN SAID DISTINCTIVE COLOR; AND (C) RUPTURING THE COATING IN DESIRED SELECTED AREAS TO RELEASE THE SOLUTION DROPLETS IN THOSE AREAS, WHEREBY THE SOLVENT OF THE RELEASED SOLUTION IS FREE TO EVAPORATE, LEAVING THE SAID SELECTED AREAS FIXED AGAINST CHANGE IN STATE.