Abstract: A photopolymerizable mixture is disclosed which contains:a) a graft copolymer having a polyurethane as the graft backbone, onto chains containing vinyl alcohol units and vinyl acetal units are grafted,b) a free-radically polymerizable compound possessing at least one terminal ethylenically unsaturated group and having a boiling point of more than 100.degree. C. at normal pressure, andc) a compound or a combination of compounds which under the action of actinic light is capable of initiating the polymerization of compound b).The mixture is suitable for use in the production of printing plates and photoresists. It is distinguished by high photospeed and can be developed with aqueous solutions. It yields printing plates producing large print runs.

Abstract: A photocurable elastomeric mixture is described which comprises a compound which contains at least one terminal ethylenically unsaturated group and is polymerizable by free radical polymerization, a photopolymerization initiator and, as binder, a graft polymer which is soluble or dispersible in water or an aqueous solution, the graft base of which is a polymer of diol components and diisocyanate components having at least 2 urethane groups in the molecule, onto which polymer carboxylic acid vinyl ester units having 3 to 20 carbon atoms, or their saponification products, are grafted. The mixture is suitable for the production of relief printing plates, in particular flexographic printing plates, and can be developed with water or aqueous solutions.

Abstract: A photocurable mixture is disclosed that contains a diazonium salt polycondensation product or an organic azido compound as the photosensitive compound and a high-molecular weight polymer as the binder, the polymer being a graft copolymer with a polyurethane as the graft backbone, onto which chains containing vinyl alcohol units are grafted. The mixture is suitable for use in the production of printing plates and photoresists, which can be developed with aqueous solutions. It yields printing plates having a good ink acceptance and long shelf life that produce large print runs.

Abstract: Polymers with polyvinyl acetal groups, which contain acetalized polyvinyl alcohol groups on polyurethane grafting substrates and which are prepared from graft polymers, containing vinyl alcohol groups on polyurethane grafting substrates, by reaction with aldehydes according to known methods. The aldehydes used can be any known aldehydes capable of acetalization reactions.The polyurethane grafting substrates contain at least 2 urethane groups in the molecule and units from diisocyanates and diols, and polymer radicals of units of vinyl carboxylates having 3 to 20 carbon atoms and/or hydrolysis products thereof and, if appropriate, further monomer units are grafted onto the polyurethane grafting subtrates. The proportion of vinyl alcohol units in the hydrolyzed or partially hydrolyzed graft polymers before the acetalization is >10% by weight.In the acetalized polymer, the content of residual unacetalized vinyl alcohol units is >7.

Abstract: Polymers with polyvinyl acetal groups, which contain acetalized polyvinyl alcohol groups on polyurethane grafting substrates and which are prepared from graft polymers, containing vinyl alcohol groups on polyurethane grafting substrates, by reaction with aldehydes according to known methods. The aldehydes used can be any known aldehydes capable of acetalization reactions.The polyurethane grafting substrates contain at least 2 urethane groups in the molecule and units from diisocyanates and diols, and polymer radicals of units of vinyl carboxylates having 3 to 20 carbon atoms and/or hydrolysis products thereof and, if appropriate, further monomer units are grafted onto the polyurethane grafting substrates. The proportion of vinyl alcohol units in the hydrolyzed or partially hydrolyzed graft polymers before the acetalization is >10% by weight.In the acetalized polymer, the content of residual unacetalized vinyl alcohol units is >7.

Abstract: Aqueous dispersions of copolymers consisting of 50-99.9% by weight of a vinyl ester of a saturated monocarboxylic acid having from 1 - 18 carbon atoms, 0.1 - 15% by weight of an .alpha.-haloalkane carboxylic acid vinyl ester of the formula ##STR1## wherein R.sub.1 is hydrogen, a halogen atom or an alkyl radical having 1 - 16 carbon atoms, R.sub.2 is hydrogen, a halogen atom or an alkyl radical having 1 - 13 carbon atom and X is a halogen atom, and 0 - 49.9% by weight of at least one other ethylenically unsaturated monomer which can be cross-linked while drying with 0.05% to 10% by weight calculated on the total mixture of an aminoplast resin, a polyamine, a polyamidoamine or a mixture of Formaldehyd and ammonia or an amine. The mixture of the dispersion and the cross-linking agent is stable, and cross-linking will start only when the mixture is applied to a substrate such as a fiber.

Abstract: Absorptive substrates, such as asbestos cement, concrete plaster work, can be impregnated to lock the pores and to consolidate the substrate, especially old and weathered plaster work, with aqueous plastics dispersions, if dispersions are used which have an average particle size of about 0.02 to at most 0.1.mu.m, and preferably from 0.036 to 0.080.mu.m. As opposed to conventional dispersions with larger particle sizes, the penetration of dispersions according to the invention reaches the same values as that of the solvent-based impregnating and priming compositions hitherto used. Aqueous dispersions are easier to handle and permit relatively high solids contents at a moderate viscosity.

Abstract: Acrylic ester copolymers are obtained by copolymerizing acrylic esters with .alpha.-haloalkanecarboxylic acid vinyl esters and .alpha., .beta.-ethylenically unsaturated carboxylic acids and optionally other unsaturated monomers in aqueous dispersion. The copolymers can be cross-linked with alkalies after polymerization and may be used as pressure-sensitive adhesives of high heat stability.

Abstract: A dispersible copolymer powder comprising vinyl ester, an acrylamide and optionally ethylene units is obtained by carying out the copolymerization reaction in an emulsifier-free aqueous medium and drying the emulsifier free aqueous dispersion of the copolymer in the absence of anti-caking agents. The copolymer powder has a very good storage stability and can be easily redispersed in water to give a dispersion having a high binder content.