Back to results
US 5,312,947 AGranted
Siloxane purification
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsAkihito Tsukuno, Isao Watanuki, Makoto Sato, Masaru Suzuki, Masao Maruyama, Masaaki Furuya
Life of this patent
Estimating the term…
Abstract
Siloxanes are purified by contacting siloxanes containing ionic crystals as an impurity with a polar solvent, evaporating the solvent, thereby increasing the mean particle size of the ion crystals, and removing the ion crystals from the siloxanes by filtration. The method enables brief, efficient purification of siloxanes in high yields, offering siloxanes having a minimal content of ionic crystals.
Claims7
A method for purifying siloxanes comprising
- contacting a siloxane crude product containing ionic crystals as an impurity with a polar solvent,
- evaporating the solvent from the crude product, thereby increasing the mean particle size of the ion crystals, and
- filtering the siloxane crude product for separating and removing the ion crystals therefrom.
Dependencies are inferred from the claim text.