Production of polydiorganosiloxane fluids with low silanol conte

Details Production of polydiorganosiloxane fluids with low silanol conte Production of polydiorganosiloxane fluids with low silanol conte

1987-12-31

1989-05-16

Shaver, Paul F.

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

Organic compounds

Silicon containing

556453, 556462, C07F 708

Patent

active

048311740

ABSTRACT:
A continuous process for producing a triorganosilyl end-blocked polydiorganosiloxane fluid with reduced silanol content and reduced branching content is described. The process comprises (a) feeding to a series of two columns packed with an acid-treated clay a liquid siloxane feed mixture, containing as a major portion a polydiorganosiloxane monomer and as a minor portion a triorganosilyl end-blocking material; (b) contacting the liquid siloxane feed mixture with the acid-treated clay in the first and second packed columns, respectively, at a temperature in a range from about 100.degree. to 150.degree. C. at a pressure in a range from about 5 to 1520 mm Hg at a contact time of less than about 15 minutes; (c) separating water vapor from an intermediate mixture between the first and second packed columns; and (d) collecting a product mixture which contains a triorganosilyl end-blocked polydiorganosiloxane fluid with silanol content substantially reduced from the equilibrium mixture.

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