Two procedures are described for the preparation of silanols and silanediols from the corresponding chlorosilanes. The first procedure, a two-phase hydrolysis-extraction process, is particularly convenient and suited to the preparation of a wide range of mono-silanols. Hydrolysis of dichlorosilanes by this procedure gives varied results depending on the structure of the dichlorosilane and specific reaction conditions. The second procedure, a modification of a published procedure, is especially beneficial for the preparation of silanols and silanediols prone to undergo self-condensation.
Two procedures are described for the preparation of silanols and silanediols from the corresponding chlorosilanes. The first procedure, a two-phase hydrolysis-extraction process, is particularly convenient and suited to the preparation of a wide range of mono-silanols. Hydrolysis of dichlorosilanes by this procedure gives varied results depending on the structure of the dichlorosilane and specific reaction conditions. The second procedure, a modification of a published procedure, is especially beneficial for the preparation of silanols and silanediols prone to undergo self-condensation.
Organosiloxane and process for preparing the same
申请人:Chisso Corporation
公开号:EP0338577A3
公开(公告)日:1991-03-06
The present invention relates to an organosiloxane compound suitable for the modification of silicone rubbers and synthetic resins, an organosiloxane compound useful as its intermediate, and a process for preparing them. The organosiloxane compound of the present invention can be represented by the general formula (IV)
wherein j is an integer of 1 to 2000, R is an alkyl group having 1 to 4 carbon atoms, and R1 is a pentafluorophenyl group or a straight-chain or a branched fluoroalkyl group represented by the formula (II)
wherein a is an integer of 3 to 18, and b is an integer of 0 to 2a.Furtheremore, the siloxane compound of the present invention may have one, two or three siloxane chains each having a substituent with a fluorine atom containing group at the terminal thereof. Each of molecules constituting the polysiloxane compound of the present invention has a terminal hydrosilyl group portion and a fluorine atom-containing terminal substituent portion therein. Since the reactive group of the hydrosilyl group is chemically bonded to the synthetic resins, the deterioration in characteristics with time can be hindered. The synthetic resins can be provided with the specific function of the fluoroalkyl group without impairing characteristics which the polysiloxane has.