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AssigneeDow Corning Corporation
InventorsJohn Currie, Phillip Griffith, William Herron, Richard Taylor
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A continuous process for producing a silicone polymer comprises the sequential steps of (i) polymerisation of a linear silanol group containing siloxane by condensation polymerisation, or of a cyclosiloxane by ring opening polymerisation, or of a mixture of said linear and cyclosiloxanes with a phosphazene base in the presence of water and the presence or absence of a filler in a static mixer, (ii) neutralising the reaction mixture in a static mixer, an in-line mixer or an extruder, and (iii) stripping the neutralised reaction mixture to remove volatile materials. Preferably step (ii) is performed in a static mixer and step (iii) is performed in a thin film stripper, extruder or co-rotating processor.
A continuous process for producing a silicone polymer which process comprises the sequential steps of (i) producing a silicone polymer by a polymerisation reaction selected from the group consisting of polymerisation of a linear silanol group containing siloxane by condensation polymerisation, polymerisation of a cyclosiloxane by ring opening polymerisation, and polymerisation of a mixture of said linear and cyclosiloxanes, with a phosphazene base in the presence of water and optionally a filler in a static mixer forming a reaction mixture, (ii) neutralising the reaction mixture in an apparatus selected from the group consisting of a static mixer, an in-line mixer and an extruder, and (iii) stripping the neutralised reaction mixture to remove volatile materials.
Dependencies are inferred from the claim text.