Process for the preparation of hollow microspheres

Details Process for the preparation of hollow microspheres Process for the preparation of hollow microspheres

1987-09-23

1988-11-01

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 58, 521 60, 521 64, 521 89, 521 94, 521141, 521 87, 521149, C08J 932, B01J 1302

Patent

active

047820977

ABSTRACT:
A process for forming hollow microspheres containing carbon or a polymer which is a carbon precursor. The process comprises forming a solution in a liquid solvent of a polymer having the following properties (a) a molecular weight of at least 10,000 and a long chain structure; (b) an ability to be coagulated by or precipitated from the solution by a non-solvent for the polymer; (c) an ability to form a continuous stretchable film when coagulated or precipitated from solution; (d) a chemical structure which is infusible or capable of being rendered infusible, and (e) a high carbon yield of at least 30% by weight upon being carbonized in a non-reactive atmosphere. An insoluble particulate blowing agent is incorporated into the solution and the solution is then divided into droplets and the droplets are introduced into a liquid bath containing a suitable non-solvent for the polymer. The non-solvent causes the polymer to precipitate or coagulate rapidly and simultaneously the blowing agent is decomposed to generate a gas within the droplets so that hollow microspheres are formed. The microspheres are then optionally subjected to carbonization in a non-reactive atmosphere at high temperature to convert the polymer to carbon. Uniformly-sized relatively large hollow microspheres can be produced by this process.

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