Abstract: Radiation-curable acrylates are prepared by a process in which the hydroxy compound is reacted with acrylic acid or methacrylic acid in a first stage and, in a second stage, the reaction product of the first stage is reacted with an epoxide compound in the presence of, as a catalyst, a quaternary ammonium or phosphonium compound of the general formula ##STR1## where X.sup.- is an opposite ion and R.sup.1 to R.sup.4 independently of one another are each C.sub.1 -C.sub.18 -alkyl which may be substituted by one or two phenyl groups or are each C.sub.6 -C.sub.12 -aryl which may be substituted by one or two C.sub.1 -C.sub.6 -alkyl groups.

Abstract: Radiation-curable acrylates are prepared by a process in which, in a 1st stage, a hydroxy compound is reacted with acrylic acid or methacrylic acid and, in or before a 2nd stage, the reaction product of the 1st stage is then reacted with an epoxy compound and compounds having one or more primary or secondary amino groups are added in the 2nd stage and the reaction in the 2nd stage is continued, after the addition of these compounds, until the acid number of the reaction mixture has decreased by at least 3 mg KOH/g of reaction mixture from the time of the addition of these compounds.

Abstract: Radiation-curable binders which are obtained by reactingA) an amine/formaldehyde condensate having a molar ratio of formaldehyde to amino groups of from 1:1 to 2:1 withB) one or more esters, having a free hydroxyl group, of acrylic acid or of methacrylic acid with polyalcohols which contain from two to four alcoholic hydroxyl groups, from 0.1 to 0.3 hydroxyl equivalent of component B) being used per methylol equivalent of component A),in the presence of a strong acid are suitable for use in coating materials.

Abstract: The preparation of copolymers which form clear aqueous solutions fromA) 45 to 90% by weight N-vinylpyrrolidone,B) 10 to 55% by weight of a vinyl ester andC) 0 to 10% by weight of other copolymerizable monomersby radical polymerization in an organic solvent in the presence of a radical initiator, and removal of the organic solvent and other volatiles by distillation, entails allowing the polymerization to proceed until the N-vinylpyrrolidone content in the reaction mixture is from 5 to 1% by weight of the N-vinylpyrrolidone amount employed, substantially removing the organic solvent and other volatiles by distillation, adding water to the mixture, again adding a radical initiator and leaving the aqueous solution at from 50.degree. to 100.degree. C. for from 1 to 10 hours, and then removing volatile organic constituents virtually completely by a steam distillation.

Abstract: Hydrazine-free vinlypyrrolidone polymers which dissolve in water and organic solvents to give a clear solution are prepared by polymerization using di-tert-butyl peroxide in an aqueous medium.

Abstract: Vinylpyrrolidone is removed from its polymers by a process in which an aqueous or alcoholic solution of the polymer is treated with an adsorbent, the adsorbents used preferably being active carbon, zeolites and especially acidic ion exchangers.

Abstract: Polyvinylpyrrolidone having a Fikentscher K value of from 14 to 95 is prepared at from 50.degree. to 95.degree. C. in aqueous solution with hydrogen peroxide as starter, the solution being maintained at pH 7-11 by means of NaOH, KOH, their carbonates or bicarbonates.

Abstract: A terpolymer of vinylpyrolidone, tert-butyl (meth)acrylate and acrylic or methacrylic acid, its use in hair treatment agents, and hair cosmetics compositions which contain these agents.

Abstract: Copolymers of vinylpyrrolidone, acrylamides which are monoalkylated or dialkylated on the N atom and alkyl or hydroxyalkyl esters of (meth)acrylic acid, with or without (meth)acrylic acid, or (meth)acrylic acid are used as and in hair fixatives.