Patent ID: 6846564

Claim:
Crosslinked microparticles of between 10 and 300 nm in size, obtained by polymerization of a composition of ethylenically unsaturated polymerizable compounds, the composition of polymerizable compounds comprising: a first component A representing from 50 to 99 mol % of the composition and selected from the group consisting of isobornyl (meth)acrylate, norbornyl (meth)acrylate, cyclohexyl (meth)acrylate, and combinations thereof, optionally in combination with a C 2 -C 3 alkyl (meth)acrylate a second component B consisting of at least one monomer or oligomer comprising at least two ethylenic unsaturations which can undergo radical-mediated polymerization, the monomer or oligomer being other than an allylic(meth)acrylate a third component C consisting of at least one monomer or oligomer comprising, in addition to an ethylenic unsaturation which can undergo radical-mediated polymerization, at least one reactive function f1 which is different from the ethylenic unsaturation optionally with at least partial chemical modification of the initial functions f1 into final functions f2 under the condition that the functions f1 selected do not react with each other during the polymerization, with the sum of the components A, B and C being 100 mol %.