D TEXTILES; PAPER
D21 PAPER-MAKING; PRODUCTION OF CELLULOSE
D21H PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
D21H11/00 Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
D21H11/16 modified by a particular after-treatment
D21H11/18 Highly hydrated, swollen or fibrillatable fibres