Method for preparing dispersions of polyurethane by polymerisation in a miniemulsion
The present invention relates to a method for preparing a dispersion of polyurethane particles, which comprises the following steps: a) placing at least one (poly)isocyanate monomer and at least one polyol monomer of formula (I): (I) in the presence of an aqueous phase comprising at least one surfactant and an organic phase comprising at least one polymerisation catalyst, thus obtaining a two-phase mixture; b) emulsifying the two-phase mixture obtained in step a), thus obtaining a miniemulsion of oil-in-water, formed by droplets of said organic phase, with a mean size of 50 nm to 500 nm, dispersed in said aqueous phase and c) polymerising the (poly)isocyanate and polyol monomers of formula (I), thus obtaining solid particles of polyurethane, with a mean size of 50 nm to 500 nm, dispersed in said aqueous phase.Figure: none.
Publication dates: 2015-06-25 / 2015-06-26 / 2016-10-26 / 2016-11-25
Iventors : CRAMAIL HENRI / ALFOS CARINE / CHOLLET GUILLAUME
Latest standardized assignees - inventors removed : INSTITUTE DES CORPS GRAS ETUDES & RECHERCHE TECHNIQUES ITERG / UNIVERSITE BORDEAUX 1 / CNRS - CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE / INSTITUT POLYTECHNIQUE BORDEAUX