Method for the preparation of diorganopolysiloxane end-blocked w

Details Method for the preparation of diorganopolysiloxane end-blocked w Method for the preparation of diorganopolysiloxane end-blocked w

1991-02-27

1995-12-12

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 23, 528 37, C08G 7706

Patent

active

054750776

ABSTRACT:
A silanol-terminated diorganopolysiloxane can be reproducibly imparted with a viscosity as desired by the alkali-catalyzed ring-opening or siloxane rearrangement reaction from a cyclic or linear-chain diorganosiloxane oligomer by conducting, instead of exactly controlling the water content in the starting reaction mixture as in the prior art method, the reaction at least in the latter stage thereof under a controlled water-vapor pressure until neutralization of the alkali catalyst after equilibrium of the reaction has been reached according to the discovery that the viscosity or degree of polymerization of the silanol-terminated diorganopolysiloxane is a function of the water-vapor pressure, under which the reaction is brought into equilibrium, at the respective temperature.

REFERENCES:
patent: 4448927 (1984-05-01), Falender et al.
patent: 4482670 (1984-11-01), Saam et al.
patent: 4710558 (1987-12-01), Jira et al.
patent: 4780519 (1988-10-01), Saam et al.
patent: 4888405 (1989-12-01), Gamon et al.
Dean (ed.), Handbook of Chemistry, 13th ed., pp. 10-82 and 10-83.
International Encyclopedia of Chemical Science, D. Van Nostrand Company, p. 340.
Budavari (ed.), The Merck Index, 11th ed., Merck & Co., Inc. (1989), pp. 120, 124, 129.

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