PROCESS FOR PRODUCING MICROFIBROUS CELLULOSE, PROCESS FOR PRODUCING NONWOVEN FABRIC, MICROFIBROUS CELLULOSE, SLURRY CONTAINING MICROFIBROUS CELLULOSE, NONWOVEN FABRIC, AND COMPOSITE

摘要

The present invention relates to a process for producing microfibrous cellulose which comprises: a carboxy group introduction step in which a fibrous raw material comprising cellulose is treated with at least one carboxylic acid-based compound selected from the group consisting of compounds having two or more carboxy groups, acid anhydrides of compounds having two or more carboxy groups, and derivatives of these to introduce carboxy groups into the cellulose; an alkali treatment step in which after completion of the carboxy group introduction step, the cellulose into which carboxy groups have been introduced is treated with an alkali solution; and a fibrillation step in which the cellulose which has undergone the alkali treatment is fibrillated. According to the invention, it is possible to provide a process for microfibrous-cellulose production in which microfibrous cellulose is highly efficiently produced from a fibrous raw material and which is low in cost and reduced in environmental burden.