Process for producing .alpha., .omega.-hydroxyfluoroalkylpolysil

Details Process for producing .alpha., .omega.-hydroxyfluoroalkylpolysil Process for producing .alpha., .omega.-hydroxyfluoroalkylpolysil

1990-02-06

1992-02-11

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 18, 528 26, 556462, C08G 7706

Patent

active

050876830

ABSTRACT:
A process for producing an .alpha., .omega.-hydroxyfluoroalkylpolysiloxane comprising polymerizing a cyclotrisiloxane in the presence of a polymerization catalyst of lithium hydroxide or a lithium salt of a diorganosiloxane, and a promoter of phtalic diorganoester and/or ortho-dialkoxybenzene, and stopping the polymerization by adding a neutralizer is disclosed. This process very easily obtains the .alpha., .omega.-hydroxyfluoroalkylpolysiloxane of a desired viscosity.
If a chloroethane of the general formula CHX, CCl X.sub.2 (X is the hydrogen or chlorine atom) is used as the neutralizer, the .alpha., .omega.-hydroxyfluoroalkylpolysiloxane does not exhibit any substantial change of viscosity over time.

REFERENCES:
patent: 3997496 (1976-12-01), Razzano
patent: 4028338 (1977-07-01), Razzano

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