Patent ID: 7265234
Filing Date: 2007-09-04
Classification: C08G,G03F,H01L

Abstract:
1. A method for preparing a mixture of silsesquioxane compounds having a high proportion of silsesquioxane compounds bearing bulky substituent groups on side chain and having a degree of condensation of substantially 100%, said method comprising: a first stage wherein a silane feed is hydrolyzed in the presence of an acid or base catalyst, said silane feed comprising a trifunctional silane bearing a bulky substituent group on side chain represented by the general formula (1): wherein Y is an organic group of 3 to 20 carbon atoms, optionally having a functional group, containing an aliphatic branched, cyclic or polycyclic structure in which the atom at the silicon-bonding site is a carbon having at least two bonds with atoms other than hydrogen and halogen atoms in addition to said silicon, or an organic group of 6 to 18 carbon atoms, optionally having a functional group, containing an aromatic structure having a substituent group other than hydrogen and halogen atoms at a site neighboring the silicon-bonding site; X 1 , X 2 and X 3 are each independently a hydrogen atom, halogen atom, straight, branched or cyclic alkoxy group of 1 to 6 carbon atoms, or aryloxy group of 6 to 10 carbon atoms, and a second stage wherein dehydrating condensation reaction is carried out in the presence of at least 0.5 mol % based on the silane feed of a strong base catalyst while removing the water resulting from condensation out of the reaction system.