Process for producing high molecular weight diorganopolysiloxane

Details Process for producing high molecular weight diorganopolysiloxane Process for producing high molecular weight diorganopolysiloxane

1975-06-10

1981-06-09

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 14, 528 21, 528 23, 556450, 556459, 260 37SB, C08G 7704

Patent

active

042726247

ABSTRACT:
A process for producing diorganopolysiloxane gums having a viscosity from 1,000 to 100,000,000 centipoise at 25.degree. C., where at least one of the organo substituent groups on the silicon atoms is an aliphatic radical of more than three carbon atoms comprising reacting a cyclic tetrasiloxane or a mixture of cyclic tetrasiloxanes at a temperature in the range of 0.degree. to 90.degree. C. and in the presence of 5 to 300 parts per million of a catalyst selected from the class consisting of cesium hydroxide and ##STR1## where R.sup.2 is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 4 to 8 carbon atoms and phenyl, B is selected from the class consisting of nitrogen and phosphorous, R.sup.3 is selected from the class consisting of alkyl radicals of 1 to 8 carbon atoms, cycloalkyl radicals of 4 to 8 carbon atoms, phenyl, siloxane chains of the unit formula R.sub.a.sup.4 SiO.sub.(4-a/2) and mixtures thereof, where R.sup.4 is selected from the class consisting of monovalent hydrocarbon radicals and halogenated monovalent hydrocarbon radicals, and a varies from 1.5 to 2.5.

REFERENCES:
patent: 3132167 (1964-05-01), Boot et al.
patent: 3433765 (1969-03-01), Geipel
patent: 3481898 (1969-12-01), Davies et al.
patent: 3661962 (1972-05-01), Geipel
patent: 3779987 (1973-12-01), Razzano
patent: 3937684 (1976-02-01), Razzano
patent: 3978104 (1976-08-01), Razzano

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