Positive image formation
US4579809A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1983 |
| Grant date | Apr 1, 1986 |
| Priority date | — |
| Expiry date | Oct 13, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/928
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Compositions that may be irradiated to form positive images useful in the manufacture of printing plates and printed circuits comprise PA1 (i) an organic solvent-soluble, radiation sensitive prepolymer which is a polyaddition or polycondensation product of a polyfunctional carbocyclic or heterocyclic compound containing at least 2 groups R capable of undergoing an addition or condensation reaction, and at least one polyfunctional carbocyclic or heterocyclic compound having at least 2 groups capable of adding to, or condensing with the groups R, this prepolymer having at least one group --COOR.sup.1 in the ortho- or peri- position to a group formed by reaction of a group R, where R.sup.1 is an organic radical with one or more double or triple bonds capable of being dimerized or polymerized by radiation-induction, and PA1 (ii) 1-25% by weight of an unsaturated mono- or di- carboxylic acid of formula ##STR1## where R.sup.2 is --H or --CH.sub.3 and PA1 R.sup.3 is --H or an alkylene chain linked through an ester group to a mono- or di- carboxylic acid and which may contain further groups of formula ##STR2## A preferred prepolymer (i) is a polyamide having repeating units of formula ##ST…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.