Patent ID: 7807723

Claim:
An anhydrous metal oxide colloid or metal oxide polymer of the formula [M(O)X 3 X 4 ] n (1) in an aprotic organic solvent or solvent mixture, wherein M is Si, Ge, Sn, Ti, Zr or Hf; and X 3 and X 4 are independently O 1/2 , H or alkoxy (—OR), wherein R is an organo radical having from 1 to 20 carbon atoms, alkyl having from 1 to 20 carbon atoms or aryl having from 6 to 20 carbon atoms, wherein the alkyl or aryl may be substituted at least once by a halogen substituents selected from the group consisting of F, Cl, Br and I; and n is from 10 to 1,000,000, wherein the metal oxide colloids and/or metal oxide polymers contain metal halides M′Hal x , wherein M′ is a metal selected from the group consisting of rare earth metals, Mn, Zn, Fe, Mg, Ca, Ba, and Sr; Hal is halogen selected from the group consisting of Cl, Br, and I; and x is the valence of the metal M′.