Patent ID: 6417345
Filing Date: 2002-07-09
Classification: C08B

Abstract:
A method for producing acetylated pyroxylin by permitting an acetylating agent and a catalyst to act on pyroxylin, wherein water-wetted pyroxylin is dehydrated in the presence of a nonalcoholic non-solvent for pyroxylin, by (i) adding said water-wetted pyroxylin in a dispersing medium provided by said nonalcoholic non-solvent for pyroxylin to form a dispersion, and then distilling said dispersion, or (ii) adding said nonalcoholic non-solvent for pyroxylin to said water-wetted pyroxylin as a replacing agent, and filtering said water-wetted pyroxylin, and the acetylating agent is then permitted to act on dehydrated pyroxylin in the presence of the catalyst and in the presence of (i) the dispersing medium or (ii) the replacing agent.