Preparation of organopolysiloxane resins with weak organic bases

Details Preparation of organopolysiloxane resins with weak organic bases Preparation of organopolysiloxane resins with weak organic bases

1979-03-26

1980-12-30

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

528 10, 528 12, 528 21, 528 32, 528 40, 528 43, C08K 505

Patent

active

042422523

ABSTRACT:
A process for forming organopolysiloxanes from hydrolyzable silanes and the resulting products are disclosed, characterized in that condensation of the silanes is carried out in the presence of a stabilizing amount of a weak organic base, such as quinoline, having an ionization constant in water no greater than about 1.times.10.sup.-7 at 25.degree. C. After hydrolysis of the silane, the resulting silanol is partially condensed to form the organopolysiloxane. During such condensation, the weak organic base provides improved stability to the organopolysiloxane solution against gelation prior to the time the organopolysiloxane is shaped and cured to a final thermoset form.

REFERENCES:
patent: 3389114 (1968-06-01), Burzynski et al.
patent: 3412128 (1968-11-01), Nielsen
patent: 3428599 (1969-02-01), Newing, Jr.
patent: 3474070 (1969-10-01), Levene
patent: 3479316 (1969-11-01), Levene

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