Organic compounds -- part of the class 532-570 series – Organic compounds – Silicon containing
Reexamination Certificate
2004-10-27
2009-12-01
Kumar, Shailendra (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Silicon containing
C556S473000
Reexamination Certificate
active
07626050
ABSTRACT:
Process for the preparation of alkylhalosilanes by reaction of an alkyl halide, preferably CH3Cl, with a solid body, referred to as contact body, formed of silicon and of a catalytic system comprising (α) a copper catalyst and (β) a group of promoting additives comprising:an additive β1 chosen from metallic zinc, a zinc-based compound and a mixture of these entities,an additive β2 chosen from tin, a tin-based compound and a mixture of these entities,optionally an additive β3 chosen from cesium, potassium, rubidium, a compound derived from these metals and a mixture of these entities,said direct synthesis process being characterized by the following points, taken in combination:the copper catalyst (α) is in the form of metallic copper. of a copper halide or of a mixture of these entities,the contact body additionally includes a supplementary promoting additive β4 chosen from a derivative of an acid of phosphorus and a mixture of these entities.
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Bluestar Silicones France SAS
Buchanan Ingersoll & Rooney P.C.
Kumar Shailendra
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