Drying of finely divided, expandable styrene polymers

Details Drying of finely divided, expandable styrene polymers Drying of finely divided, expandable styrene polymers

C - Chemistry, Metallurgy

08

F

C08F 112/08 (2006.01) B29B 13/06 (2006.01) C08J 9/224 (2006.01) F26B 3/08 (2006.01) F26B 17/10 (2006.01)

Patent

CA 2061175

O.Z. 0050/42214 Abstract of the Disclosure: In order to dry finely divided, expandable styrene polymers having a particle size of from 0.02 to 3 mm, the bead polymers, in the form of a slurry in water, are freed from the majority of the water and subsequently exposed to a gaseous medium. The drying is carried out in two steps, by jointly conveying the bead polymer and a first gas stream, warmed to from about 45° to 120°C, through a flow dryer, the ratio between the gas and the bead polymer being from 2 to 40 kg/kg, separating the bead polymer from the first gas stream, immediately transferring the bead polymer into a fluidized bed and treating the polymer with a second gas stream at from about 0° to 75°C. Styrene polymers ob- tained in this way are free-flowing and can be foamed without difficulty in commercially available prefoaming units. They are used, inter alia, in the construction industry, for example as aggregate for insulation plaster.

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