Abstract: A rheology modifier obtainable by polymerizing (i) at least one ethylenically unsaturated carboxylic acid; (ii) at least one nonionic ethylenically unsaturated surfactant monomer, (iii) at least one C1-C2-alkyl methacrylate, and (iv) at least one C2-C4-alkyl acrylate, where the alkyl chain length averaged over the number of alkyl groups of the alkyl acrylate is 2.1 to 4.0. The polymerization is carried out in the presence of at least one hydrocarbon comprising at least one XH-group, wherein X is selected from the group consisting of O, P, N and S. Liquid formulations and particles containing liquid detergents comprising the rheology modifier are also described.

Abstract: A rheology modifier obtainable by polymerizing (i) at least one ethylenically unsaturated carboxylic acid; (ii) at least one nonionic ethylenically unsaturated surfactant monomer, (iii) at least one C1-C2-alkyl methacrylate, and (iv) at least one C2-C4-alkyl acrylate, where the alkyl chain length averaged over the number of alkyl groups of the alkyl acrylate is 2.1 to 4.0. The polymerization is carried out in the presence of at least one hydrocarbon comprising at least one XH-group, wherein X is selected from the group consisting of O, P, N and S. Liquid formulations and particles containing liquid detergents comprising the rheology modifier are also described.

Abstract: What is described is the use of polymer particles for producing photonic crystals, wherein the polymer particles do not film and have, at their contact points in the photonic crystal, linkage sites which allow linkage of the particles by physical or chemical bonding, without reducing the volume of the interstitial phase by more than 30%.

Abstract: A process for preparing an aqueous addition-polymer dispersion by free-radically initiated aqueous emulsion polymerization of at least one ethylenically unsaturated monomer in the presence of at least one dispersant and at least one free-radical initiator at a polymerization temperature ?20° C.

Abstract: Paper, board and cardboard are produced by adding (i) at least one retention aid and (ii) ionic, water-insoluble, uncrosslinked, organic microparticles which have an average particle size of less than 500 nm and a content of polymerized ionic monomers of less than 1% by weight or water-insoluble, uncrosslinked, organic microparticles having an average particle size of less than 500 nm and a content of polymerized ionic monomers of not more than 10% by weight, which are obtainable by polymerizing the monomers in the presence of silica, waterglass, bentonite and/or mixtures thereof, to a paper stock and draining the paper stock over a wire.

Abstract: Process for preparing an aqueous polymer dispersion by polymerizing at least one ethylenically unsaturated monomer B in an aqueous medium in the presence of polymer particles A and at least one dispersant.

Abstract: Process for improving the brilliance of color and the stability of a colored polymer system, which is composed of a matrix and of discrete polymer particles distributed in accordance with a defined spatial lattice structure in the matrix, and which is obtained by filming of an emulsion polymer with core/shell structure, which comprises using an emulsion polymer obtainable by polymerizing monomers in at least one first stage (core monomers), then polymerizing monomers in at least one further, second stage (transition stage), and finally polymerizing monomers in a third stage (shell monomers), where, based on the percentage constitution of the monomer mixtures of the three stages, at most 30% by weight of the monomers of the first stage are identical with those of the third stage, and 5% of the monomers of the second stage are identical with, respectively, those of the first and those of the third stage, and not more than 60% by weight of the monomers of the 2nd stage here are monomers absent in the 1st stage

Abstract: A process for preparing a polymer having isotactic or syndiotactic regions (ordered regions for short) by polymerizing polymerizable compounds (monomers) in the presence of an optically active compound as complexing agent, wherein more than 50% by weight of the optically active compound is in the form of only one of the possible enantiomers, the polymerization takes place at temperatures below 20° C., and at least 10% by weight of the monomers are prochiral compounds.

Abstract: The present invention relates to a laser gain medium comprising at least one active species adapted to be stimulated to emit laser light within a predetermined wavelength range and optical feedback means defining a resonator for said laser light. The feedback means comprise at least one substantially solid cholesteric layer having a substantially planar texture exhibiting selective reflection of light defined by a reflection band tuned to said predetermined wavelength range.

Abstract: A storage-stable aqueous miniemulsion whose disperse phase comprises a cholesteric mixture is prepared and is used for coating and printing on suitable substrates.

Abstract: The present invention relates to an amplifying medium for solid-state dye lasers and to a solid-state dye laser provided with an amplifying medium of this type. The amplifying medium according to the invention comprises an essentially solid active medium which contains at least one type of activatable particle which can be excited to emit laser light in a certain wavelength range, and optical feedback means which define a resonator for the laser light, where the feedback means comprise an essentially solid feedback medium which has a periodic structure. The feedback medium in the amplifying medium is a polymeric dispersion film having a crystalline structure which comprises, in particular, core/shell particles which can be formed into a film.

Abstract: A process for preparing pigment particles of defined size and shape comprises treating a sheetlike structure having through openings of defined shape and size with a polymerizable substance or mixture of substances in such a way that the openings are filled, removing any solvent present, polymerizing the substance or substance mixture, and isolating the resulting pigment particles from the openings. The pigments are readily varied in size and shape by variation of the substrate parameters and are useful for the known pigment applications, especially coatings, paints and inks.

Abstract: A process for coating or printing substrates with a coating or printing composition comprises applying a polymerizable material containing liquid-crystalline, polymerizable monomers which carryat least two polymerizable groups for coating andat least one polymerizable group for printing,to the substrate, and subsequently carrying out the polymerization, where the coating composition or the printing composition comprisesa.sub.1) a chiral liquid-crystalline monomer andb) a polymeric binder and/or monomeric compounds which can be converted into the polymeric binder by polymerization, or, in the case of emulsion coatings and printing inks, a dispersion auxiliary d),or the coating composition or the printing composition comprisesa.sub.

Abstract: An electrophotographic recording element comprising(A) an electrically conducting base and(B) at least one photoconductive layer consisting essentially of(b.sub.1) at least one binder,(b.sub.2) at least one sensitizer which on exposure of layer (B) generates charge carriers and which is selected from the group of the isoindolenine dyes of the general structure I ##STR1## where the index and the variables have specified meanings, (b.sub.3) at least one photoconductor which transports the generated charge carriers and optionally(b.sub.4) additives,in useful for reprographic purposes, for producing printing plates, in particular offset plates, and for producing photoresists.