Abstract: 2-Acylated dihydro-1,3-dioxepins proved to be highly reactive photoinitiators having a low tendency towards yellowing.

Abstract: This invention relates to aqueous, radiation-hardenable emulsions produced from mixtures of the following:(A) from 90 to 50%, by weight, of at least one acrylate prepolymer, containing, per 100 g, from 0.2 to 0.65 mols of (meth)acryloyloxy groups and having a viscosity of from 500 to 300,000 mPa.s, measured at 20.degree. C.;(B) from 10 to 50%, by weight, of at least one emulsifier polyester having a viscosity of from 2,000 to 200,000 mPa.s, containing, per 100 g:(1) from 0.06 to 0.28 mols of condensed units of an .alpha.-.beta.-mono-olefinically unsaturated dicarboxylic acid;(2) from 0.04 to 0.34 mols of benzyloxy groups; and(3) from 30 to 80%, by weight, based on emulsifier polyester, of alkylene-oxy groups (-alkylene-O-);the sum of (A) and (B) amounting to 100%,(C) from 25 to 400%, by weight, of water; and(D) from 0 to 10%, by weight, of at least one conventional photoinitiator;the percentage contents of (C) and (D) being based on the sum of (A) and (B).

Abstract: Polyesters containing co-condensed polyalkylene glycol residues as the sole air-drying components are, providing they satisfy certain requirements, an excellent basis for photopolymerizable unsaturated polyester resins which harden under UV-light very rapidly even in extremely thin layers.

Abstract: A radiation-hardenable binder comprising a reaction product ester containing hydroxyl groups and hydroxyalkyl acrylates, which comprises:(A) 1 NCO gram equivalent of a polyisocyanate containing from 2 to 3 isocyanate groups per molecule; (B) from 0.4 to 1.2 OH gram equivalents of an ethylenically-unsaturated partial ester having an OH number of from 80 to 150 of an alkoxylated trimethylol propane having a degree of alkoxylation of 3 to 4.5 and acrylic acid or methacrylic acid or a mixture thereof; and (C) from 0 to 0.6 OH gram equivalents of a hydroxy alkyl acrylate or hydroxy alkyl methacrylate or a mixture thereof containing from 2 to 6 carbon atoms in the alkyl group, wherein the sum total of the OH-gram equivalents of B and C is between 1 and 1.2.Aqueous dispersions containing the binder are used for impregnating, coating, reinforcing or priming textile materials, wood, plastics, non-wovens or leather.

Abstract: A water-dispersible urethane acrylate binding agent which comprises a reaction product of: (A) 1 gram equivalent NCO of a di- or tri-isocyanate; (B) from 0 to 0.7 gram equivalent OH of a polyol, free of organically bound sulphur; (C) from 0.1 to 0.7 gram equivalent OH of a hydroxy-(C.sub.2 -C.sub.6 alkyl)-acrylate; and (D) from 0.01 to 0.5 gram equivalent NH of an amino sulphonic acid or an alkali metal or an alkaline earth metal salt thereof having from 1 to 4 amino groups per sulphonic acid group; the ratio of NCO group: NCO-reactive groups being from 1:1 to 1:1.2 which are prepared by reacting components (A), (B), (C), and (D) in a ratio of NCO groups:NCO-reactive groups of from 1:1 to 1:1.2 at a temperature of from 20.degree. to 100.degree. C.

Abstract: Monomer-free aqueous dispersions of air-drying unsaturated polyesters can be hardened to thin coatings in the presence of accelerators, but in the absence of common initiators, if the chemical structure of the polyester meets specific requirements.

Abstract: Aqueous emulsions of unsaturated polyester resins comprising two "air-drying" polyesters, one polyester containing co-condensed polyalkylene glycol residues and the other polyester being free from groups such as these, can be hardened uniformly and relatively quickly to form tack-free, open-pore coatings, even on exotic woods.

Abstract: Paraffin-containing monomer-free aqueous emulsions of a mixture comprising two unsaturated polyesters, of which one contains .alpha.,.gamma.-unsaturated ether groups, but no co-condensed residues of higher polyalkylene glycols, while the other contains co-condensed residues of higher polyalkylene glycols and monofunctional alcohols and/or carboxylic acids, but no .alpha.,.gamma.-unsaturated ether groups, are eminently suitable for the production of extremely thin-layer coatings without levelling faults.

Abstract: Unsaturated polyester resins, the polyesters of which contain 0.3 - 0.7 moles, relative to the alcohol component, of units of monohydric alcohols are outstandingly suitable for the production of cured lacquer films which are uniformly matt without matting additives when a barrier agent is used.

Abstract: Polyester moulding and coating compositions based on polyester resins of:A. from 20 to 90% by weight based on the sum of components (A) and (B), of .alpha.,.beta.-ethylenically unsaturated polyesters, andB. from 80 to 10% by weight based on the sum of components (A) and (B) of polymerizable compounds, these polyester compositions containing, in addition to possible further additives,C. from 0.1 to 8.0% by weight based on the sum of components (A) and (B) of polymerization initiators,D. from 0.001 to 0.1% by weight based on the sum of components (A) and (B) of polymerization inhibitors,E. from 0.001 to 0.5% by weight, based on the sum of components (A) and (B), of conventional accelerators,F. from 0.05 to 5.0% by weight based on the sum of components (A) and (B) of additional accelerators, and optionally,G. from 0.01 to 1.