POROUS WATER-SOLUBLE NONIONIC CELLULOSE ETHER HAVING EXCELLENT SOLUBILITY AND METHOD FOR PRODUCING THE SAME

There are provided a porous water-soluble nonionic cellulose ether having an average pore size of 36 ??m or smaller and an average particle size of from 30 to 300 ??m; and a method for continuously producing said cellulose ether comprising the steps of: pulverizing a first water-soluble nonionic cellulose ether to obtain a first pulverized product， and sieving the pulverized product through a sieve having an opening of from 40 to 400 ??m to obtain a first residue-on-sieve and a first sieve-passing fraction， wherein a portion or all of the first residue-on-sieve containing particles having particle sizes smaller than and greater than the opening of the sieve is re-pulverized together with a second water-soluble nonionic cellulose ether in the step of pulverizing to obtain a second pulverized product， which is pulverized to obtain the cellulose ether as a second sieve-passing fraction containing the re-pulverized particles.