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Positive image formation
| Details |
Inventors: Irving, Edward;
Assignee: Ciba-Geigy Corporation (Ardsley, NY)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
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 --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 (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 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 ##STR3## where R.sup.4 is a photopolymerizable group, especially a (meth)acryloyloxyalkyl, and X is a covalent bond, --O--, --S--, --CO--, --SO.sub.2 --, or alkylene. |
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DETAILED DESCRIPTION What is claimed is: 1.
A composition comprising (i) an organic solvent-soluble, radiation-sensitive prepolymer, being a polyaddition or polycondensation product of (1) at least one polyfunctional carbocyclic compound containing at least two groups R capable of undergoing an addition or condensation reaction, and (2) at least one polyfunctional carbocyclic compound containing at least two groups capable of undergoing an addition or condensation reaction with the groups R, the prepolymer having at least one group --COOR.
sup.
1 in the ortho- or peri-position with respect 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 dimerised or polymerised by radiation-induction, and (ii) 1-25% by weight, calculated on the weight of the prepolymer (i), of an unsaturated mono- or di-carboxylic acid of formula I ##STR11## where R.
sup.
2 represents a hydrogen atom or a methyl group and R.
sup.
3 represents a hydrogen atom or an alkylene chain linked through an ester group to an aromatic or aliphatic mono- or di-carboxylic acid and which contain zero to two further groups of formula ##STR12## 2.
A composition according to claim 1, in which the prepolymer (i) is a product formed by reacting (3) at least one polyfunctional carbocyclic compound containing at least two groups R, as defined in claim 1, and at least one group --COOR.
sup.
1, as defined in claim 1, in the ortho-, or peri-position with respect to a said group R, and (4) at least one polyfunctional carbocyclic compound containing at least two groups capable of undergoing an addition or condensation reaction with the groups R.
3.
A composition according to claim 2, in which the prepolymer (i) is a polyamide obtained from an acid having two or more carboxylic acid groups as the groups R and having one or more groups --COOR.
sup.
1 (a) by converting the carboxylic acid groups into acid chloride groups and reacting the resulting acid chloride with a compound having two or more amino groups, or (b) by reaction of the acid with a compound having two or more isocyanate groups
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