Patent ID: 6194481
Filing Date: 2001-02-27
Classification: A61K,A61L,B33Y,B82Y,C01P,C09C,Y10S,Y10T

Abstract:
A composition photopolymerizable into transparent or translucent solids comprising:a matrix comprising monomers comprising a photopolymerizable unsaturated carbon-carbon bond;particles comprising zirconium oxide, said particles having a diameter in nanometers which is small enough to provide sufficient transparency but large enough to provide effective fracture toughness after photopolymerization;wherein said particles comprise a surface comprising hydroxyl groups, a first portion of said hydroxyl groups being bonded to a silicon atom of a silanating agent effective to increase hydrophobicity of said surface in an amount sufficent to allow said particles to be homogeneously dispersed in a hydrophobic resin, a second portion of said hydroxyl groups being bonded to a functionality selected from the group consisting of a zirconium atom of a photopolymerizable, hydrolyzable zirconate, and a zirconium atom or an aluminum atom of a photopolymerizable zircoaluminate.