Process for production of carbon products
AssigneeSumitomo Chemical Company, Limited
InventorsShozo Horikiri, Jiro Iseki, Masao Minobe, Chikanao Kawai
Life of this patent
Estimating the term…
Abstract
A process for the production of carbon micro-balloons and carbon micro-spheres which comprises reacting polymeric microparticles with sulfuric anhydride or chlorosulfonic acid so as to make the surface layer or the whole of the micro-particles infusible and then carbonizing the obtained micro-particles by heating them at a temperature above the decomposition point of the starting polymer.
Claims18
A process for producing carbon micro-balloons which comprises reacting micro-particles made from at least one polymer selected from the group consisting of an alkyl vinyl polymer, an aryl vinyl polymer, a vinyl ether polymer, a polyacrylic ester, a polyvinyl nitrile, an alkyl vinylidene polymer, an aryl vinylidene polymer, a cyanovinylidene polymer, polybutadiene, polyisoprene and polychloroprene with sufficient sulfuric anhydride or chlorosulfonic acid at a temperature of 0.degree.C. to 400.degree.C. so as to render the surface layer of said micro-particles infusible while the inner part of the micro-particles is maintained without being so modified, and carbonizing the resulting modified micro-particles by heating at a temperature above the decomposition point of the starting polymer, said temperature being at least in the range of 500.degree.C. to 1,500.degree.C.
Dependencies are inferred from the claim text.