Photopolymerizable resins

A photopolymerizable resin of the formula ##STR19## where b represents zero or 1,

• e is an integer of average value at least 1,
• each R.sup.10 denotes a hydrogen atom or a methyl group,
• each R.sup.11 represents the organic divalent residue of a compound having two glycidyl groups directly attached to an atom or atoms of oxygen, nitrogen, or sulfur, after removal of the said two glycidyl groups,
• each R.sup.12 represents the divalent residue of a dihydric alcohol, a dihydric phenol, a saturated dicarboxylic acid of 2 to 8 carbon atoms, or a compound containing two groups selected from amide groups and imide groups, after removal of two terminal hydrogen atoms attached to an oxygen or nitrogen atom or atoms,
• each R.sup.13 denotes an alkylene group of 1 to 6 carbon atoms, an alkenylene group of 2 to 10 carbon atoms, an arylene group of 6 to 10 carbon atoms, or a cycloalkylene or cycloalkenylene group of 5 to 8 carbon atoms,
• each R.sup.14 denotes a divalent aliphatic, cycloaliphatic, or araliphatic group of 2 to 8 carbon atoms,
• with the proviso that at least 25% of the total of the (e+1) R.sup.11 and e R.sup.12 groups each represent a group of the formula ##STR20## where R.sup.4 represents a divalent aliphatic, cycloaliphatic, or araliphatic radical of 1 to 8 carbon atoms,
• c denotes zero or 1, and
• each R.sup.15 denotes an alkyl group of 1 to 4 carbon atoms or each pair of R.sup.15 conjointly represents a group of formula --CH.sub.2 CH.sub.2 --, --C(R.sup.16 R.sup.17)CO--, ##STR21## --CH.sub.2 CH.sub.2 CH.sub.2 --, or --COCO--, wherein R.sup.16 and R.sup.17 each denote a hydrogen atom or a straight or branched alkyl group of up to 9 carbon atoms or R.sup.16 and R.sup.17 may together denote tetramethylene, pentamethylene, methylpentamethylene, or hexamethylene.