Combined use of polyol esters and cationic polyelectrolytes in aqueous polyurethane dispersions
AssigneeEvonik Operations GmbH
InventorsMichael Klostermann, YeChen Le, Kai-Oliver Feldmann, Marvin Jansen
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Abstract
The combined use of polyol esters and cationic polyelectrolytes as additives in cosurfactant-containing aqueous polymer dispersions for production of porous polymer coatings, preferably for production of porous polyurethane coatings, is described.
Claims20
A dispersion comprising a dispersion additive comprising a combination of polyol esters and cationic polyelectrolytes, wherein the dispersion is selected from the group consisting of aqueous polymer dispersions, aqueous polyurethane dispersions, and aqueous polyurethane dispersions containing cosurfactants.
A process for producing a porous polymer coating, by the combined use of polyol esters and cationic polyelectrolytes as additives in aqueous polymer dispersions, comprising the steps of
- a) providing a mixture comprising at least one aqueous polymer dispersion, preferably aqueous polyurethane dispersion, especially cosurfactant-containing aqueous polyurethane dispersion, at least one polyol ester, at least one cationic polyelectrolyte and optionally further additives,
- b) foaming the mixture to give a homogeneous, fine-cell foam,
- c) optionally adding at least one thickener to adjust the viscosity of the wet foam,
- d) applying a coating of the foamed polymer dispersion, to a suitable carrier,
- e) drying the coating.
Dependencies are inferred from the claim text.