The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 11, 2025
Filed:
Mar. 02, 2021
Daio Paper Corporation, Ehime, JP;
Takaaki Imai, Ehime, JP;
Yu Ochiai, Ehime, JP;
Daio Paper Corporation, Ehime, JP;
Abstract
Fibrous cellulose highly capable of reinforcing resins, fibrous cellulose composite resins with high strength, and a method for preparing fibrous cellulose highly capable of reinforcing resins. The fibrous cellulose has an average fiber width of ≥0.1 μm, and has hydroxyl groups partially/fully substituted with carbamate groups at the substitution rate of ≥1.0 mmol/g, and has an average fiber length of >0.10 mm. This fibrous cellulose and a resin are contained in the composite resin. The method includes heat treating a cellulose raw material and urea or derivatives thereof to substitute part/all of the hydroxyl groups in the cellulose raw material with carbamate groups, and defibrating the raw material into an average fiber width of ≥0.1 μm, wherein the heat treating is performed so that the rate of carbamate-group-substitution is ≥1.0 mmol/g and an average fiber length of the material is >0.10 mm.