Positive image formation

Details Positive image formation Positive image formation

G - Physics

03

F

96/150, 96/215

G03F 7/037 (2006.01)

Patent

CA 1241861

- 1 - POSITIVE IMAGE FORMATION ABSTRACT Compositions that may be irradiated to form positive images useful in the manufacture of printing plates and printed circuits comprise 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 -COOR1 in the ortho- or peri- position to a group formed by reaction of a group R, where R1 is an organic radical with one or more double or triple bonds capable of being dimerised or polymerised by radiation-induction, and ii) 1-25% by weight of an unsaturated mono- or di- carboxylic acid of formula Image where R2 is -H or -CH3 and R3 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 Image - 2 - A preferred prepolymer (i) is a polyamide having repeating units of, formula Image where R4 is a photopolymerisable group, especially a (meth)acryloyloxyalkyl, and X is a covalent bond, -O-, -S-, -CO-, -SO2-, or alkylene.

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