Polymerization of polysiloxanes
AssigneeRhone-Poulenc Industries
InventorsClaude Millet, Gerard Soula
Life of this patent
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Abstract
High molecular weight organopolysiloxanes, e.g., polydimethylpolysiloxane oils and gums, are facilely and rapidly prepared by polymerizing/rearranging a lower molecular weight organopolysiloxane in the presence of a catalytically effective amount of an alkaline catalyst and a tris-(oxaalkyl)-amine accelerator having the formula (I): N--CHR.sub.1 --CHR.sub.2 --O--CHR.sub.3 --CHR.sub.4 --O).sub.n R.sub.5 ].sub.3 (I).
Claims15
In a process for the preparation of high molecular weight organopolysiloxanes by the catalyzed polymerization and rearrangement of lower molecular weight organopolysiloxanes, the improvement which comprises conducting said process in the presence of a catalytically effective amount of an alkali metal catalyst or an alkaline earth metal catalyst, and a tris-(oxaalkyl)-amine accelerator having the formula (I):
- N-CHR.sub.1 -CHR.sub.2 -O-CHR.sub.3 -CHR.sub.4 -O).sub.n R.sub.5 ].sub.3 (I)
- wherein n is a number greater than or equal to 0 and less than or equal to 10;
- R.sub.1, R.sub.2, R.sub.3, R.sub.4, which may be identical or different, each represents a hydrogen atom or an alkyl radical having from 1 to 4 carbon atoms;
- and R.sub.5 represents a hydrogen atom, an alkyl or cycloalkyl radical having up to 12 carbon atoms, a phenyl radical or a radical of the formula -C.sub.m H.sub.2m -.phi., or C.sub.m H.sub.2m+1 -.phi.-, with m ranging from 1 to 12 and .phi. being phenyl.
Dependencies are inferred from the claim text.