Patent ID: 6355698
Filing Date: 2002-03-12
Classification: C08J

Abstract:
A process for producing a substantially anhydrous blowing agent powder, comprising the steps of:treating a blowing agent powder comprising at least one selected from the group consisting of azodicarbonamide, p,pâ€²-oxybis(benzenesulfonyl hydrazide), dinitropentamethylenetetramine, p-toluenesulfonyl hydrazide and benzenesulfonyl hydrazide with a surface-treating agent capable of removing water from the blowing agent powder under conditions substantially free of a solvent, and carrying out a heating treatment at a temperature of 30Â° C. to the decomposition temperature of the blowing agent powder during or after the treatment with the surface-treating agent to provide a substantially anhydrous blowing agent powder.