University of Michigan

Panasonic Electric Works Co., Ltd.

Panasonic Corporation

Norihiro Takamura

Richard M Laine

Isao Hasegawa

Michael Z Asuncion

Ken-ichi Shinotani

Lisa Viculis

Ken-Ichi Shinotani

Inorganic/organic hybrid polymers containing silsesquioxane cages are robust and exhibit desirable physical properties such as strength, hardness, and optical transparency at infrared and ultraviolet wavelengths. The polymers are prepared by polymerizing functionalized polyhedral silsesquioxane monomers such as polyhedral silsesquioxanes bearing two complementarily reactive functional groups bonded to cage silicon atoms by means of spacer moieties. The spacer moieties allow for steric mobility and more complete cure than polyhedral silsesquioxanes bearing reactive functional groups bound directly to cage silicon atoms.

Ultraviolet transmissive polyhedral silsesquioxane polymers

Polyhedral silsesquioxane anions are economically prepared by reaction of a silica source derived from combusted organic material with a quaternary ammonium hydroxide compound. Reaction of the resulting anions with chlorosilanes may be effected in near stoichiometric fashion in organic solvent containing reactive quantities of organic acids such as formic acid. The functional groups on the resulting functionalized silsesquioxanes may be substituted for other functional groups by reaction with di- or polysiloxanes in the presence of a synthetic ion exchange resin.

Facile synthesis of polyhedral silsesquioxane anions and use thereof

Growing community of inventors

Osaka, Japan

Norihiro Takamura