Patent ID: 8586692

Claim:
Method for the manufacture of a polybranched organic/inorganic hybrid polymer suitable as a light protective additive in a total process comprising a sol-gel process in which hydrolysable metal compounds with functional amino groups are reacted in a first step comprising the formation of a core under controlled and complete hydrolysis and condensation with a silane of formula: NH 2 —B—Si(—Y) 3 where B is a linkage group chosen among saturated or unsaturated C 1 -C 18 alkylene, substituted or unsubstituted arylene, in which the carbon chains may include one or more branches and/or that one or more carbon atom may be substituted by the elements oxygen, nitrogen, sulphur, silicon, and boron, while Y is a hydroysable residue; and wherein the total process comprises at least one additional step in which one or more of said functional amino groups are reacted with an aromatic carboxylic acid derivative comprising a group with a proton donating ability in ortho position to the carboxylic acid derivative group.