Patent ID: 8673116
Filing Date: 2014-03-18
Classification: D04H,Y10T

Abstract:
1. A water disintegratable fibrous sheet, comprising 30-50% by mass of unbeaten pulp (a) with a beating degree of 700 cc or greater; 20-40% by mass of beaten pulp (b) with a beating degree of 400-650 cc; 15-45% by mass of regenerated cellulose (c) with a beating degree of 700 cc or greater and 2-15% by mass of fibrillated purified cellulose (d) with a beating degree of 0-400 cc; wherein the beaten pulp (b) and fibrillated purified cellulose (d) each comprise main bodies and microfiber sections extending from the main bodies, the fiber lengths of the main bodies of the fibrillated purified cellulose (d) at the peak of the weight-weighted average fiber length distribution are in the range of 1-7 mm, the microfibers of the beaten pulp (b) and the fibrillated purified cellulose (d) are each entangled with the other fibers, the regenerated cellulose (c) is viscose rayon or copper-ammonia rayon, the fibrillated purified cellulose (d) is formed by dissolving pulp in an aqueous solution of N-methylmorpholine N-oxide to produce a spinning stock solution (dope) and extruding into a dilute solution of N-methylmorpholine N-oxide, and the microfiber sections of the fibrillated purified cellulose (d) constitute 0.1-65% by mass of the dry mass of the fibrillated purified cellulose (d).