Apparatus for blending and dispensing foamable, curable organosiloxane compositions
AssigneeDow Corning Corporation
InventorsTherese M. Bauman, Todd S. Klenk
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Abstract
An apparatus for preparing foams exhibiting a uniformly small cell size, a minimum number of ruptured cell walls and a smooth surface from foamable curable compositions comprises means to transport the ingredients of a foamable, curable composition to the input of a static mixer in which the ingredients of the composition are blended to homogeneity prior to being extruded into an exit zone and through an exit orifice. The length to diameter ratio of the mixing zone and the diameter of the exit orifice are within specified ranges.
Claims5
An apparatus for blending and dispensing a foamable organosiloxane composition, said apparatus comprising:
- 1) a source of organohydrogensiloxane, a source of reactant selected from the group consisting of curable polyorganosiloxanes containing silanol groups, water and alcohols, and a source of curing catalyst
- 2) a means for mixing said organohydrogensiloxane, said reactant selected from the group consisting of curable polyorganosiloxanes containing silanol groups, water and alcohols, and said curing catalyst, said means for mixing having a mixing zone consisting essentially of a channel having an inlet and an outlet and containing a plurality of static mixing elements positioned within the channel, wherein the ratio of the length of said channel to the diameter of said channel is at least 11, and
- 2) an exit zone communicating with the outlet of said channel and comprising a nozzle containing an exit orifice where the diameter of said exit orifice does not exceed 1.50 mm.
Dependencies are inferred from the claim text.