Process for production of dihydroxysiloxanes

Process for production of dihydroxysiloxanes

a ,o -Dihydroxysiloxanes are made by reacting cyclosiloxanes with water in the presence of catalysts at 220 DEG to 280 DEG C. and a superatmospheric pressure of up to 30 kg./sq. cm. Catalysts specified are KOH and H3PO4. In a typical Example (1), water, KOH and octamethylcyclotetrasiloxane were heat...

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Bibliographische Detailangaben
Hauptverfasser: KARLIN ALEXANDR VASILJEVICH, MITROFANOV LEOPOLJD ADAMOVICH, TROFIMOV VALENTIN MIKHAILOVICH
Format: Patent
Sprache:eng
Schlagworte:
ACYCLIC, CARBOCYCLIC OR HETEROCYCLIC COMPOUNDS CONTAININGELEMENTS OTHER THAN CARBON, HYDROGEN, HALOGEN, OXYGEN, NITROGEN,SULFUR, SELENIUM OR TELLURIUM
CHEMISTRY
METALLURGY
ORGANIC CHEMISTRY
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Zusammenfassung:a ,o -Dihydroxysiloxanes are made by reacting cyclosiloxanes with water in the presence of catalysts at 220 DEG to 280 DEG C. and a superatmospheric pressure of up to 30 kg./sq. cm. Catalysts specified are KOH and H3PO4. In a typical Example (1), water, KOH and octamethylcyclotetrasiloxane were heated to 250 DEG C. in an utoclave, the pressure being 18 kg./sq. cm., to yield an a ,o -dihydroxydimethylpolysiloxane having a molecular wt. of 7000.