Patent ID: 8153836

Claim:
A method for preparing a mixture of silsesquioxane compounds comprising silsesquioxane units having a side chain including a direct bond between a silicon atom and a norbornane skeleton in which some methylene groups may be replaced by oxygen atoms and having a degree of condensation of substantially 100%, wherein a dimethylene chain of the norbornane skeleton remote from the silicon bonded side is substituted with at least one substituent group other than hydrogen, and an isomer having a bulkier substituent group on said dimethylene chain at an exo position is present in a higher proportion, said method comprising reacting a silsesquioxane compound bearing hydrogen as substituent groups and having a degree of condensation of substantially 100% with a norbornene derivative in which a dimethylene chain has substituted thereon at least one substituent group other than hydrogen, an isomer having a bulkier substituent group on said dimethylene chain at an exo position is present in a higher proportion, and some methylene groups may be replaced by oxygen atoms.