Monodispersed polydimethylsiloxane-.alpha.,.omega.-diol fluids a

Details Monodispersed polydimethylsiloxane-.alpha.,.omega.-diol fluids a Monodispersed polydimethylsiloxane-.alpha.,.omega.-diol fluids a

1992-07-10

1993-10-19

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 19, 528 31, 556459, 556462, 556467, C08G 7706

Patent

active

052546543

ABSTRACT:
The molecular weight distribution of polydimethylsiloxane-.alpha., .omega.-diol fluids is reduced by contacting the fluid with an alkaline earth metal hydride or hydroxide. Molecular weight distributions lower than Poisson distributions may be obtained. The resulting monodispersed polydimethylsiloxane.alpha., .omega.-diol fluids may be substituted by reaction with common silanating reagents to prepare telechelic polydimethylsiloxanes which are nearly monodispersed.

REFERENCES:
patent: 3308203 (1967-03-01), Metevia et al.
patent: 3943091 (1976-03-01), Akiyama
patent: 5079291 (1992-01-01), Evans
Lucas et al., J. Amer. Chem. Soc., 74, 5225 (1952).
Patnode et al., J. Amer. Chem. Soc., 68, 358 (1946).
Noll, Chemistry and Technology of Silicones, pp. 192-198 Academic Press, New York, N.Y. (1968); and
Kazama et al., Macromolecules 24, 122 (1991).

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