Photographic process for producing colored polymerized images
US3957515A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 14, 1975 |
| Grant date | May 18, 1976 |
| Priority date | — |
| Expiry date | Mar 14, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03F7/105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photosensitive composition including a photopolymerizable monomer system and a thermochromic substance which can be used in a phootographic reproduction process which avoids the use of liquid elements for developing and fixing. The process is based on the different dielectric constants and heat losses exhibited by a monomer and the corresponding polymer and the reaction of certain thermochromic substances which exhibit a specific threshold temperature above which these substances change from a colorless form to a colored, stable form. The photosensitive element is exposed according to an original having image areas and non-image areas with a light source to cause polymerization in areas corresponding to the transparent areas of the original to form a latent image of polymerized zones and unpolymerized zones; the exposed photosensitive elements are developed by passing through a high frequency electric field which raises the temperature of the polymerized zones by dielectric heating to above the color threshold temperature of the thermochromic substance. Apparatus for carrying out the process is also described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.