Method for the preparation of a ladder-type organopolysiloxane

Details Method for the preparation of a ladder-type organopolysiloxane Method for the preparation of a ladder-type organopolysiloxane

1989-01-16

1991-08-13

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 21, 528 33, C08G 7706

Patent

active

050397710

ABSTRACT:
An oligomeric cage-like poly(silsesquioxane) of the general formula ##STR1## in which R is a monovalent hydrocarbon group and m is 4 to 12, can be polymerized by being admixed with a catalyst, e.g. alkali hydroxide or fluoride, and irradiated with microwaves. Different from conventional method of thermal polymerization, the polymerization reaction proceeds very uniformly at a high velocity to give a polymer of a high average molecular weight and narrow molecular weight distribution.

REFERENCES:
patent: 3294737 (1966-12-01), Krantz
patent: 3294738 (1966-12-01), Krantz

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