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US 9,040,731 B2Granted
Method for preparation of platinum-carbonyl-siloxane compounds
AssigneeUmicore AG & Co. KG
InventorsGregory Hedden, Eric L. Frueh, Wayne J. Gallagher
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AssigneeUmicore AG & Co. KG
InventorsGregory Hedden, Eric L. Frueh, Wayne J. Gallagher
Estimating the term…
The invention relates to a method for preparation of platinum siloxane compounds containing at least one CO ligand molecule (Pt carbonyl siloxanes). The method comprises reacting gaseous carbon monoxide (CO) with a platinum siloxane compound, preferably a platinum vinyl-cyclosiloxane compound, in solution with an organic solvent. The method is straightforward and applicable to industrial scale. With this method, specific isomers of platinum carbonyl vinylcyclosiloxanes are prepared, in which the two η-2-ethenyl groups coordinated to the Pt atom are bonded in trans-configuration relative to the cyclosiloxane backbone. The Pt compounds obtained by the method are used as catalysts for hydrosilylation and for crosslinking and curing of siloxanes and silanes.
A method for the preparation of a Pt-carbonyl-siloxane compound comprising at least one CO ligand bonded to the platinum atom and at least one siloxane ligand, wherein gaseous carbon monoxide (CO) is reacted with a Pt-siloxane compound in solution with an organic solvent.
Platinum carbonyl [2,4-di(η-2-ethenyl)-6,8-diethenyl-2,4,6,8-tetramethyl-cyclotetrasiloxane] according to Formula II
Platinum carbonyl [2,4-di(η-2-ethenyl)-6-ethenyl-2,4,6-trimethylcyclotri-siloxane] according to Formula IV
Catalyst comprising a mixture of platinum carbonyl [2,4-di(η-2-ethenyl)-6,8-diethenyl-2,4,6,8-tetramethyl cyclotetrasiloxane] and platinum carbonyl [2,4-di(η-2-ethenyl)-6-ethenyl-2,4,6-trimethyl cyclotrisiloxane], wherein in each Pt compound the two η-2-ethenyl groups are bonded to the Pt atom in trans-configuration relative to the cyclosiloxane backbone.
Dependencies are inferred from the claim text.