Abstract:
The present invention relates to a process for the preparation of a readily water-redispersible polymer powder by spray drying of an aqueous polymer B dispersion, wherein the spray drying of the aqueous polymer B dispersion is effected in the presence of a polymer A, wherein polymer A has a glass transition temperature ≥ 60°C, a weight average molecular weight Mw≥ 1000 and ≤ 25000 g/mol, a polydispersity index ≤ 5and is composed of ≥ 5 and ≤ 50 wt% of at least one α,β-monoethylenically unsaturated mono- or dicarboxylic acid and/or anhydride (monomer A1), and ≥ 50 and ≤ 95 wt% of at least one other ethylenically unsaturated compound which is copolymerizable with the monomers A1 (monomer A2), in polymerized form, wherein the monomer amounts A1 and A2 sum up to 100 wt%.
Abstract:
The present invention relates to microcapsules, comprising a capsule core and a capsule wall, wherein the capsule wall is composed of 50 to 90% by weight of one or more C 1 -C 24 -alkyl esters of acrylic and/or methacrylic acid (monomers I), 10 to 50% by weight of one or more polyvinyl monomers (monomers II), and 0 to 30% by weight of one or more monounsaturated, non-ionizable monomers (monomers III), which are different from monomers I, in each case relative to the total weight of the monomers. The invention further relates to a method for the production of said microcapsules, and to the use thereof in binding building materials, textiles and heat transfer fluids.
Abstract:
The invention relates to a novel use of microcapsules comprising a polymer capsule wall and a lipophilic substance as a capsule core, said lipophilic substance having a melting point of ≤120°C and a boiling point of ≥100 °C, as additives providing stability in freeze-thaw conditions in hydraulically setting construction material mixtures.
Abstract:
Disclosed are binder compositions containing, as essential components, at least one dispersion polymer P that has a glass transition temperature ≤20 °C and contains ethyl acrylate in a polymerized form, and at least one mineral binder M which features low VOC emission after hardening.