Process for the production of diaralkyldichlorosilanes and their use in manufacture of polysiloxane

Claim 2

A diaralkyldichlorosilane of the general formula (I) wherein R and R 2 are the same or different and each represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, p and q are the same or different and each represents 0, 1, 2 or 3, when p and/or q is 1 then R 3 and/ or R 4 , as the case may be, is an alkyl group having from 1 to 4 carbon atoms and when p and/or q is 2 or 3 then each R 3 and/or R 4 , as the case may be, is the same or different and is an alkyl group having from 1 to 4 carbon atoms provided that R 1 and R 2 are not both hydrogen atoms when p and q are both 0.

Claim 3

A compound according to claim 1 which is a di-β-phenylalkyldichlorosilane wherein the alkyl groups are the same or different but not both ethyl.

Claim 4

3, A compound according to claim 2 which is di-β-phenylpropyldichlorosilane.

Claim 5

A compound according to claim 1 which is a di-β-tolylalkyldichlorosilane.

Claim 6

A compound according to claim 4 which is di-β-tolylethyldichlorosilane.

Claim 7

A compound according to claim 1 which is a β-phenylalkyl. β-tolylalkyldichlorosilane.

Claim 8

A process for producing a diaralkyldichlorosilane expressed by the general formula (I) (wherein R and R 2 are the same or different and each represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, p and q are the same or different and each represents 0, 1, 2 or 3, when p and/or q is 1 then R 3 and/or R 4 , as the case may be, is an alkyl group having from 1 to 4 carbon atoms and when p and/or q is 2 or 3 then each R 3 and/or R 4 , as the case may be, is the same or different and is an alkyl group having from 1 to 4 carbon atoms; provided that R 1 and R 2 are not both hydrogen atoms when p and q are both 0) which process comprises: subjecting dichlorosilane (II) to an addition reaction with a styrene compound (III) which is styrene itself, or a styrene derivative (wherein R 1 , p and R 3 each have the same definition as above), at a temperature of 30 to 200°C in the presence of a catalyst which is a complex of a transition metal of group VIII of the Periodic Table and a phosphine compound, to form a monoaralkyldichlorosilane expressed by the general formula (IV) and then subjecting the monoaralkyldichlorosilane to an addition reaction with a styrene compound (V) which is styrene itself or a styrene derivative (wherein R 2 , q and R 4 each have the same definition as above), at a temperature of 10 to 200°C in the presence of a catalyst which is a complex of a transition metal of group VIII of the Periodic Table and a phosphine compound, or is chloroplatinic acid (unless R 2 in the general formula (V) is hydrogen atom).

Claim 9

A process for producing a diaralkyldichlorosilane expressed by the general formula (I) (wherein R and R 2 are the same or different and each represents a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, p and q are the same or different and each represents 0, 1, 2 or 3, when p and/or q is 1 then R 3 and/or R 4 , as the case may be, is an alkyl group having from 1 to 4 carbon atoms and when p and/or q is 2 or 3 then each R 3 and/or R 4 , as the case may be, is the same or different and is an alkyl group having from 1 to 4 carbon atoms; provided that R 1 and R 2 are not both hydrogen atoms when p and q are both 0) which process comprises: subjecting dichlorosilane (II) to an addition reaction with a styrene compound (III) which is styrene itself, or a styrene derivative (wherein R 1 , p and R 3 each have the same definition as above), at a temperature of 30 to 200°C in the presence of a catalyst which is a complex of a transition metal of group VIII of the Periodic Table and a phosphine compound, to form a monoaralkyldichlorosilane expressed by the general formula (IV) and then subjecting the monoaralkyldichlorosilane to an addition reaction with a styrene compound (V) which is styrene itself or a styrene derivative (wherein R 2 , q and R 4 each have the same definition as above), at a temperature of 10 to 200°C in the presence of a catalyst which is a complex of a transition metal of group VIII of the Periodic Table and a phosphine compound, or is chloroplatinic acid (unless R 2 in the general formula (V) is hydrogen atom).

Claim 10

A process according to claim 7 wherein the catalyst is a complex expressed by the general formula MX n (P )m wherein R 0 is phenyl, aryl, alkyl or aralkyl; M is a metal selected from ruthenium, rhodium, nickel, and platinum; X is a covalently bound halogen or hydrogen atom, a covalently bound substituted silyl group, or a non-covalently bound carbon monoxide molecule or aromatic hydrocarbon compound;n is an integer of 0 to 4 and m is an integer of 2 to 4, provided that 3 ≦ (n+m) 7.

Claim 11

A process for producing polysiloxanes which comprises hydrolyzing at least one diaralkyldichlorosilane according to any of claims 1 to 6, optionally together with at least one other organodichlorosilane, followed by polycondensation.

Claim 12

A polysiloxane obtained by a process according to claim 9.