Preparation of high molecular weight organopolysiloxane

Details Preparation of high molecular weight organopolysiloxane Preparation of high molecular weight organopolysiloxane

1992-08-06

1993-07-13

Marquis, Melvyn I.

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

Synthetic resins

From silicon reactant having at least one...

528 26, 528 33, 556442, C08G 7706

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active

052274470

ABSTRACT:
The process for preparing a high molecular weight organopolysiloxane comprises subjecting a hydroxyl-containing organosiloxane, as a starting material, to a dehydration condensation reaction in the presence of an acidic compound selected from the acidic compounds represented by the following general formulas (1) and (2): ##STR1## wherein in the formulas n is an integer of from 1 to 10, k is an integer of from 0 to 8, and 1 and m are each an integer of 0 or above, with 1+m being in the range from 1 to 10. The process is advantageous over the conventional methods in that compounds having toxicity or the like are neither used nor by-produced. The process also has the merit of easy control of the molecular weight of the intended organopolysiloxane.

REFERENCES:
patent: 3032530 (1962-05-01), Falk
patent: 3155634 (1964-11-01), Pike
patent: 3280214 (1966-10-01), Mitchell
patent: 3812081 (1974-05-01), Dennis et al.
patent: 3903047 (1975-09-01), Ashby
Patent Abstracts of Japan, vol. 10, No. 136 (C-347) (2193), May 20, 1986 and JP-A-60 262 826, Dec. 26, 1985, M. Morita, "High Molecular Weight Polydiphenylsiloxane and Its Production".

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