| US 7,576,169 B2 | ||
| Facile synthesis of polyhedral silsesquioxane anions and use thereof | ||
| Isao Hasegawa, Gifu (Japan); Richard M. Laine, Ann Arbor, Mich. (US); Michael Z. Asuncion, Ann Arbor, Mich. (US); and Norihiro Takamura, Ann Arbor, Mich. (US) | ||
| Assigned to The Regents of the University of Michigan, Ann Arbor, Mich. (US) | ||
| Filed on Oct. 22, 2004, as Appl. No. 10/971,809. | ||
| Claims priority of provisional application 60/513665, filed on Oct. 23, 2003. | ||
| Prior Publication US 2005/0142054 A1, Jun. 30, 2005 | ||
| Int. Cl. C08G 77/04 (2006.01); C08G 77/06 (2006.01); C01B 33/113 (2006.01) | ||
| U.S. Cl. 528—33 [423/325; 428/12] | 9 Claims |
| 1. A process for preparing a functionalized silsesquioxane, comprising:
a) preparing a quaternary ammonium salt of a polyhedral silsesquioxane anion of the formula SinO5n/2n− comprising:
i) providing a silica source derived from the combustion of naturally occurring organic substances;
ii) reacting said silica source with water and quaternary ammonium hydroxide in an alcohol solvent at a temperature in excess
of 60° C.; and
b) reacting said quaternary ammonium salt with one or more organochlorosilanes in a liquid to form an organosiloxy-functionalized
silsesquioxane, wherein said liquid comprises a water scavenger.
|