Drying of finely divided, expandable styrene polymers

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

1992-02-10

1992-09-08

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 56, 521 57, 521 59, 521146, C08J 922, C08J 9224

Patent

active

051458780

ABSTRACT:
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.degree. to 120.degree. 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.degree. to 75.degree. C. Styrene polymers obtained 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.

REFERENCES:
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patent: 4525484 (1985-06-01), Hahn et al.
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patent: 4579872 (1986-04-01), Johnson
patent: 4681779 (1987-07-01), Ingram
patent: 4983639 (1991-01-01), Hahn et al.
patent: 4990540 (1991-02-01), Hahn et al.

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