Thermoplastic microspheres

Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter

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264 43, 264 433, 42840221, 521 56, 521 57, 521920, B01J 1322, C08J 916, C08J 9224

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active

053426894

ABSTRACT:
Microsphere wet cake is mixed with a surface barrier coating effective to prevent agglomeration and surface bonding of the microspheres, and removing water by drying with continuous mixing at high shear. In a subsequent step, by the control of the application of heat and balancing temperature and low shear mixing, it is possible to also control expansion of the microspheres.
The surface barrier coating in the present invention is any one of a wide diversity of materials which meet the requirements of the intended function, i.e., to prevent the agglomeration of the microspheres during the process. Suitable materials include, by way of example, dry inorganic pigments or filler materials, and the like, and related organic materials.

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