Abstract: Water-dilutable resinous products are obtained by reacting(A) a resin having at least one phenolic hydroxyl group and a free position ortho and/or para to a phenolic hydroxyl group, and containing a residue formed by polymerization of a vinyl monomer in the resin or in a precursor thereof,(B) an aldehyde, and(C) sulphurous acid or an organic acid containing a primary or secondary amino group or a mercaptan group and a carboxylic, sulphonic or phosphonic acid group, or a water-soluble salt thereof.Aqueous compositions containing the resinous products and, if required, and aminoplast, a phenoplast or a blocked polyisocyanate, usually together with a minor amount of an organic solvent, are useful in the formation of surface coatings.

Abstract: Diacrylates or dimethacrylates, which are compatible with water before exposure to actinic radiation but after such exposure form hard, insoluble, coatings which are resistant to organic solvents and to water, are made by reaction with (meth)acrylic acid, or with a dicarboxylic acid and a hydroxy group-containing (meth)acrylate, of epoxide groups in an advanced diepoxide resin containing groups of formula ##STR1## where R.sup.4 denotes a divalent (cyclo)aliphatic or araliphatic radical,each R.sup.15 denotes an alkyl group or each pair of R.sup.15 denotes a group of formula --CH.sub.2).sub.2 --, --C(R.sup.16 R.sup.17)CO--, --CH.sub.2 CH(CH.sub.3)--, --CH.sub.2 --.sub.3, or --CO--.sub.2, wherein R.sup.16 and R.sup.17 each represent a hydrogen atom, an alkyl group, or, conjointly, a cycloaliphatic ring, andc is zero or 1.