The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 21, 1992
Filed:
Mar. 12, 1991
Pradyot Agaskar, Lawrenceville, NJ (US);
Other;
Abstract
Hydridospherosiloxanes and soluble hydrogensilsesquioxane resin are produced having the formula (HSiO.sub.3/2).sub.n, where n is an even integer greater than 8. A biphasic reaction medium is prepared, having a first solvent phase and a second solvent phase. The first solvent phase can contain a hydrocarbon solvent, such as an alcohol. The first solvent phase can be methanol or ethanol. The second solvent phase is a concentrated solution of a metal salt, such as Fe(III) in a polar organic solvent and water. A silicon compound represented by the formula: HSiX.sub.3, where X is a group which is hydrolyzable in the solvent of said first solvent phase, is added to the biphasic reaction medium. X can be Cl or OCH.sub.3. The first solvent phase is separated from the second solvent phase and then the separated first solvent phase is treated with a metal salt, such as sodium or potassium carbonate. Slow evaporation of the first solvent phase solvent is employed to isolate a mixture of crystals of (HSiO.sub.3/2).sub.8, and (HSiO.sub.3/2).sub.10. The crystal mixture is washed with a hydrocarbon solvent and crystals of (HSiO.sub.3/2).sub.8 are isolated.