Process for preparing diorganopolysiloxanes having terminal Si-b

Details Process for preparing diorganopolysiloxanes having terminal Si-b Process for preparing diorganopolysiloxanes having terminal Si-b

1988-12-07

1990-02-20

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

C07F 708

Patent

active

049028138

ABSTRACT:
A process for preparing diorganopolysiloxanes having terminal Si-bonded hydroxyl groups which comprises reacting an organosilicon compound selected from a cyclic diorganopolysiloxane, a diorganodichlorosilane hydrolysis product and mixtures thereof with from 0.1 to 3 percent by weight of a diorganodichlorosilane, based on the weight of the organosilicon compound, i.e., the cyclic diorganopolysiloxane and/or diorganodichlorosilane hydrolysis product employed, in the presence of from 1 to 50 ppm by weight of phosphonitrile chloride, based on the total weight of the organosilicon compound and diorganodichlorosilane employed, to form diorganopolysiloxanes containing an Si-bonded chlorine atom in each of the terminal units, then treating the reaction mixture with water or an aqueous solution, separating off the aqueous phase from the diorganopolysiloxanes containing an Si-bonded hydroxyl group in each of the terminal units and thereafter removing the low boiling constituents by distillation.

REFERENCES:
patent: 2830967 (1958-04-01), Nitzsche et al.
patent: 3160601 (1964-12-01), Hyde
patent: 3705205 (1972-12-01), Autoneu
patent: 3839388 (1974-10-01), Nitzsche et al.
patent: 3902047 (1975-09-01), Ashby
patent: 4053494 (1977-10-01), Burkhardt
patent: 4762937 (1988-08-01), Ottlinger et al.

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