Polycondensation of hydroxysilylated polysiloxanes

Details Polycondensation of hydroxysilylated polysiloxanes Polycondensation of hydroxysilylated polysiloxanes

1980-07-18

1981-12-29

Briggs, Sr., Wilbert J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525474, 528 14, 528 20, 528 21, 528 23, C08G 7708

Patent

active

043083668

ABSTRACT:
High molecular weight organopolysiloxanes are rapidly prepared, without formation of the low molecular weight polysiloxanes, by polycondensing a hydroxysilylated polysiloxane in the presence of a catalytic amount of a catalyst system including (i) an alkali or alkaline earth metal, and (ii) a polyheteromacropolycyclic co-catalyst having the structural formula: ##STR1## wherein .SIGMA. is a divalent radical having the structural formula ##STR2## or a divalent radical having the structural formula: ##STR3## further wherein each R, which may be identical or different, is a divalent hydrocarbon radical, each Q, which also may be identical or different, is a divalent hydrocarbon radical, an oxygen atom or a sulfur atom, and m, n and p are each integers equal to 1, 2 or 3.

REFERENCES:
patent: 2542334 (1951-02-01), Hyde
patent: 3156668 (1964-11-01), Pike
patent: 4116887 (1978-09-01), Lehn et al.
patent: 4138543 (1979-02-01), Bargain et al.
Journal of Polymer Science, Polymer Letters Edition, vol. 12 (1974), Wiley & Sons Publishers, pp. 217-220.

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