Process for the preparation of siloxane-oxyalkylene copolymers
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United States of America Patent
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Apr 16, 2002
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Dec 4, 1998
filing date -
Dec 4, 1998
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Abstract
This invention disclosure describes an improved process for the preparation of siloxane-oxyalkylene copolymers via hydrosilation of unsaturated polyethers with organohydrogensiloxanes in the presence of hydroxyl, carbonyl, or ether-functional amines as buffer-catalyst modifiers for noble metal hydrosilation catalysts. The common side reactions such as dehydrocondensation and acetal formation are significantly reduced or eliminated, by the use of these amines, without reduction in hydrosilation rates.
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