Abstract:
The invention relates to dispersion polymers, processes for their preparation, and their use, and also active dispersion polymers (latex conjugates) prepared therefrom, the dispersion polymers being obtained by polymerizing compounds of the formula IH.sub.2 C.dbd.C(R.sub.1)--CO--NH--(CH.sub.2).sub.n --CH(OR.sub.2)(OR.sub.3)Iin whichn denotes 1-6;R.sub.1 denotes H or CH.sub.3 andR.sub.2 and R.sub.3 are identical or different and denote --(CH.sub.2).sub.m --CH.sub.3,m denotes 0-7, or --CY(X)(Z), in which X, Y and Z denote (CH.sub.2).sub.p CH.sub.3 andp denotes 1-3, where X, Y and Z are identical or different,and compounds of the formula IIH.sub.2 C.dbd.C(R.sub.1)--CO--R--(CH.sub.2).sub.n --(CHOH).sub.m --(CH.sub.2).sub.l --H IIin whichR denotes O or NH;n denotes 1-3;m denotes 1-4;l denotes 0-4; andR.sub.1 denotes H or CH.sub.3,with one another in the presence of a seed dispersion, whereby the copolymer is formed on the surface of the latex particles.Latex conjugates are obtained therefrom by bonding the interesting antibodies or antigens to the dispersion polymers according to the invention.
Abstract:
The preparation of polymers free from emulsifiers and protective colloids by the free-radical initiated emulsion polymerization of ethylenically unsaturated co-polymerizable monomers, wherein the emulsion polymerization is carried out in the absence of emulsifiers and protective colloids, using water-soluble, free-radical forming initiators and with the addition, at least at the start of the polymerization, of at least 0.01% by weight, based on the total amount of monomers, of poly-(ethylenically unsaturated) monomers, and the polymers can be obtained in the form of aqueous or non-aqueous dispersions or in the form of powder.The use of the polymers in the form of dispersions or powders for modifying polymer materials and polymer raw materials and for the production of shaped articles and films.
Abstract:
Dispersion powders with a reduced tendency to autoignition are obtained by adding antioxidants to dispersions before spray drying or to dispersion powders after spray drying.
Abstract:
Preparation of aqueous plastics dispersions which contain vinyl ester polymers or vinyl ester copolymers and have reduced contents of undesirable preparation-related residual monomeric vinyl esters and, where appropriate, acetaldehyde, from corresponding starting dispersions such as are obtainable by customary polymerization or copolymerization methods from ethylenically unsaturated monomers, by selective alkaline hydrolysis of the residual monomeric vinyl esters which can be hydrolyzed under alkaline conditions and if appropriate oxidation of the acetaldehyde to acetic acid in the aqueous dispersions.
Abstract:
Process for lowering the residual monomer content in aqueous plastic dispersions based on polyvinyl esters.Preparation of vinyl ester polymers or vinyl ester copolymers containing aqueous plastic dispersions having reduced contents of undesired residual vinyl ester monomers, caused by the preparation, and, optionally, acetaldehyde from corresponding starting dispersions, such as are obtainable from ethylenically unsaturated monomers by conventional polymerization or copolymerization methods, by selective alkaline saponification of the residual vinyl ester monomers saponifiable under alkaline conditions in the dispersions and preferably simultaneous removal of the acetaldehyde and unsaponified residual vinyl ester monomers from the aqueous dispersions by distillation.Use of the plastic dispersions free from residual monomer as binders in low-emission or emission-free aqueous formulations, for example for paints, coatings, plaster mortars, adhesives, paper sizing agents, nonwoven binders, textile auxiliaries, and the like, in particular for applications in indoor areas or in closed rooms.
Abstract:
Unreinforced or reinforced concrete moldings, for example concrete pipes, with improved corrosion resistance to acids and acidic sewage, improved permeation resistance to inorganic and organic liquids and gases and improved mechanical stability, produced by molding with machines, for example in press molding machines or extrusion machines or concrete pipe pressing machines, and allowing to harden plastic-viscous concrete mixtures of hydraulic inorganic binders, preferably cement, aggregates and water, where, in the preparation of the plastic-viscous concrete mixtures, to the latter has been added in a positive mixer an effective amount of an aqueous plastics dispersion based on anionic and hydrolysis-resistant copolymers of ethylenically unsaturated monomers, the minimum film forming temperature (MFT) of which is above the setting temperature of the concrete mixture, preferably above 23.degree. C. Use of the concrete moldings as concrete precast parts for many various applications, preferably as construction elements in building construction, road building, bridge building, civil engineering, in particular in sewage pipeline construction for underground sewer lines and service water lines.
Abstract:
The preparation of polymers free from emulsifiers and protective colloids by the free-radical initiated emulsion polymerization of ethylenically unsaturated copolymerizable monomers, wherein the emulsion polymerization is carried out in the absence of emulsifiers and protective colloids, using water-soluble, free-radical forming initiators and with the addition, at least at the start of the polymerization, of at least 0.01% by weight, based on the total amount of monomers, of poly-(ethylenically unsaturated) monomers, and the polymers can be obtained in the form of aqueous or non-aqueous dispersions or in the form of powder.The use of the polymers in the form of dispersions or powders for modifying polymer materials and polymer raw materials and for the production of shaped articles and films.
Abstract:
Copolymers prepared by emulsion or solution copolymerization, initiated by free radicals, of unsaturated copolymerizable monomers, the copolymers being built up from(a) 1-45% by weight of ethylenically unsaturated carboxylic acids,(b) 0.5-30% by weight of a surface-active crotonic acid ester,(c) 30-85% by weight of methacrylic acid esters or acrylic acid esters of aliphatic (C.sub.1 -C.sub.18)-alcohols,(d) 0-40% by weight of other ethylenically unsaturated comonomers,(e) 0-3% by weight of polyethylenically unsaturated compounds and(f) 0-5% by weight of molecular weight regulators,and, if appropriate, the free acid groups of the copolymers subsequently having been partly or completely neutralized by addition of bases and converted into water-soluble or colloidally water-dispersible copolymer salts.In addition, processes for the preparation of the copolymers by solution or emulsion copolymerization and, if appropriate, subsequent conversion thereof into the copolymer salts, and the use of the products as viscosity-increasing and rheology-modifying substances in aqueous systems, in particular aqueous dispersions, preferably for thickening emulsion paints, emulsion gloss lacquers, textile printing pastes and paper printing pastes, and furthermore as sizing agents in the textile industry.
Abstract:
What is disclosed is a method for the isolation of the polyvalent proteinase inhibitor from aqueous extracts of animal organs by adsorbing the inhibitor from its aqueous solutions at pH 0.5 to 10.5 on an ion exchanger containing functional sulfonate or phosphonate groups and eluting it with water or a salt solution at pH 1 to pH 13, the exchanger having a particle size from 0.03 to 0.08 mm or, in case the ion exchanger is a copolymer gel of ethene-sulfonate and acrylamide, having a particle size from 0.03 to 3 mm preferably from 0.06 to 0.3 mm.
Abstract:
A process is disclosed for reducing the microbe count in microbially-contaminated aqueous multi-phase composition containing synthetic resin, such as polymer dispersions and formulations that contain polymeric binders. The process uses dielectric heating, preferably immediately before transfer of the multi-phase composition to containers.