Acid-catalyzed process for the production of cyclosiloxanes

Details Acid-catalyzed process for the production of cyclosiloxanes Acid-catalyzed process for the production of cyclosiloxanes

1992-07-10

1993-09-21

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Silicon containing

556461, C07F 708

Patent

active

052471160

ABSTRACT:
Cyclosiloxanes are produced by the acid-catalyzed redistribution of siloxane bonds in polysiloxane fluids at a temperature of about 20-200.degree. C. Little catalyst and no water or solvent is required. Cyclosiloxane product mixtures contain .ltoreq.1 wt. % cyclosiloxane species having more than 18 silicon-oxygen bonds, and .ltoreq.0.5 wt. % cyclosiloxanes having 6 or fewer silicon-oxygen bonds, based upon the weight of the product mixture. The process may be carried out in continuous fashion where redistribution is carried out simultaneously with the stripping of cyclics from the equilibration mixture.

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Chem. Abs. 87-118455(b) abstracting Japanese Patent Application 52/69500 (1977); and Crivello et al., Chemistry of Materials 1(4) 445 (1989).

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