Patent ID: 9650536
Date: 2017-05-16
CPC Classifications: B82Y,C08F,C08J,C09D

Claim:
1. A method for producing a nanocomposite dispersion comprising composite particles of inorganic nanoparticles and organic polymers in a dispersion medium as a continuous phase, wherein the method comprises the following method steps: (a) providing inorganic nanoparticles in the form of a dispersion comprising the inorganic nanoparticles; (b) then, subjecting the dispersion comprising the inorganic nanoparticles resulting from step (a) to a surface modification, wherein the surface modification comprises an at least two-stage surface treatment comprising: (i) one stage where the inorganic nanoparticles are contacted with at least one dispersing agent and (ii) another stage where the inorganic particles are provided with functional groups on their surfaces via chemical reaction; (c) subsequently, combining the dispersion comprising the surface-modified inorganic nanoparticles, resulting from step (b) with at least one kind of polymerizable monomers, followed by a polymerization of the polymerizable monomers in the presence of the surface-modified inorganic nanoparticles, via emulsion polymerization, thus resulting in a nanocomposite dispersion comprising composite particles of inorganic nanoparticles and organic polymers in a continuous phase dispersion medium, wherein polymerization is performed by polymerizing the polymerizable monomers in the presence of the surface-modified inorganic nanoparticles and, optionally, in the presence of at least one polymerization initiator, wherein polymerization is performed as an at least two-stage polymerization process comprising a first stage producing a seed of composite particles of inorganic nanoparticles and organic polymers, followed by a second stage where polymerization is continued, finalized by a post polymerization step.