Abstract:
The invention relates to a method for producing an aqueous polymer dispersion by means of radically initiated aqueous emulsion polymerisation of at least one ethylenically unsaturated monomer in a polymerisation container comprising an external circuit leading away from said polymerisation container and back thereto.
Abstract:
A process is described for reducing the residual monomer content in a liquid solution, mixture, melt, suspension or dispersion of a polymer by postpolymerization with addition of a redox initiator system at a reaction temperature appropriate to it and with an extremely short mixing time of the liquid system in the production reactor by metering-gradually, in portions or continuously-at least one of the redox initiator components required to initiate polymerization of the residual monomers over a period (metering time) which is from about 10 to 250 times the mixing time of the liquid system in said reactor.
Abstract:
A process for the production of low-viscosity, aqueous polymer dispersions (APD), with polymer concentrations of at least 50 vol% and viscosities of less than 1000 mPa.s, comprises radical emulsion polymerisation of ethylenic monomers (except vinyl and vinylidene halides), by the monomer addition method, in the presence of an initiator and small amounts of water-miscible organic solvent(s) (I). Also claimed are APD obtained by this process.
Abstract:
A process for the production of low-viscosity, aqueous polymer dispersions (APD), with polymer concentrations of at least 50 vol% and viscosities of less than 1000 mPa.s, comprises radical emulsion polymerisation of ethylenic monomers (except vinyl and vinylidene halides), by the monomer addition method, in the presence of an initiator and small amounts of water-miscible organic solvent(s) (I). Also claimed are APD obtained by this process.
Abstract:
Composición acuosa que contiene una mezcla constituida por un 10 a un 50 % en peso de un polímero A) con un contenido en gel menor que un 40 % en peso, y un peso molecular en media numérica Mn de fracciones solubles menor que 30 000, y que contiene un 60 a un 100 % en peso, referido al polímero, de (met)acrilatos de alquilo con 1 a 20 átomos de carbono, y sus mezclas, y un 50 a un 90 % en peso de una carga B), estando referidos los datos porcentuales a la suma ponderal del polímero A) y de la carga B).
Abstract:
The invention relates to a method for producing an aqueous polymer dispersion by means of radically initiated aqueous emulsion polymerisation of at least one ethylenically unsaturated monomer in a polymerisation container comprising an external circuit leading away from said polymerisation container and back thereto.
Abstract:
An aqueous composition comprises a mixture of from 10 to 50% by weight of a polymer A) having a gel content of less than 40% by weight and a number-average molecular weight M n of the soluble fractions of less than 30,000 and from 50 to 90% by weight of a filler B), the amounts by weight being based on the weight sum of the polymer and of the filler.