Fluid silico-acrylic compositions, stable in the long term, polymerizable
thermally and by radiatiion, by mechanism giving rise to free radicals,
with a very low water (less than 1%) and volatile solvent content,
containing silica, a silane, and a multifunctional acrylic monomer, in
which the silica is in the form of indivualized particles with an average
diameter with the range 9 amd 100 nm, not interconnected by siloxane
bonds, the silane is a vinyl silane with the formula (I)
H.sub.2 C.dbd.CH--Si(OR).sub.3 (I)
in which R represents a methyl or ethyl radical, and the multifunctional
(meth)acrylic monomer is an alkoxylated (meth)acrylate, method for
preparation and use for the development of anti-scratch transparent and
uncoloured varnishes, obtained by polymerization giving rise to free
radicals by radiation (UV, electron bundles) or thermally.
