Process for the preparation of hollow microspheres

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

B - Operations, Transporting

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18/2, 18/503

B01J 13/02 (2006.01) B01J 13/12 (2006.01) B01J 13/20 (2006.01) C04B 35/52 (2006.01) C08J 3/14 (2006.01) C08J 9/08 (2006.01) C08J 9/32 (2006.01)

Patent

CA 1287459

Abstract: The invention provides a process of 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 precip- itated 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 in- soluble particulate blowing agent is incorporated into the solution and the solution is then divided into drop- lets 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 coagu- late 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.

519529

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