US 8,940,881 B2 · Method for producing chitin nanofibers, composite material and coating composition each containing chitin nanofibers, and method for producing chitosan nanofibers, composite material and coating composition each containing chitosan nanofibers

Abstract

The present invention provides a method for producing chitin nanofibers, which includes the steps of deproteinizing a material derived from a chitin-containing organism by an alkali treatment, deashing a deproteinized integument by an acid treatment, optionally treating the deashed integument under acidic conditions, and then subjecting to a fiber-loosening treatment. The present invention also provides chitin nanofibers obtained by the method, and a composite material and a coating composition each containing the same. The present invention provides a method for producing chitosan nanofibers, which includes, in addition to the above steps, a deacetylation step and chitosan nanofibers obtained by the method, and a composite material and a coating composition each containing the same.

Claims1

Dependent claims

A method for producing chitin nanofibers composed of an extended-chain crystalline structure comprising:

subjecting a material obtained from a chitin-containing organism to at least one deproteinization step and at least one deashing step,
subjecting the deproteinized and deashed material to a step of treating with an acidic reagent, and
subjecting the treated material to a fiber-loosening step,
wherein:
the chitin-containing organism is a crab or prawn,
the acidic reagent is a weak acid,
a pH in the step of treating with an acidic reagent is from 3 to 4,
the fiber-loosening step is performed with a stone mill type triturating machine or a high-pressure homogenizer, and
each step is carried out without drying, thereby preventing the chitin nanofibers from aggregation by hydrogen bonding.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

13/142,071Filed 30 Jun 2009

Priority

JP 2008-33418726 Dec 2008

Published

US 2011/0319528 A129 Dec 2011

Granted

27 Jan 2015

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

D01F 9/00
Artificial filaments or the like of other substances
C08B 37/003
2-Acetamido-2-deoxy-beta-glucans; Derivatives thereof: chitin, i.e. 2-acetamido-2-deoxy--D-glucan or N-acetyl-beta-1,4-D-glucosamine; Chitosan,…
C08L 5/08
Compositions of polysaccharides or of their derivatives not provided for in groups C08L1/00 or C08L3/00: chitin; Chondroitin sulfate; Hyaluronic…
C09D 105/08
Coating compositions based on polysaccharides or on their derivatives, not provided for in groups C09D101/00 or C09D103/00: chitin; Chondroitin…

Method for producing chitin nanofibers, composite material and coating composition each containing chitin nanofibers, and method for producing chitosan nanofibers, composite material and coating composition each containing chitosan nanofibers

Life of this patent

Method for producing chitin nanofibers, composite material and coating composition each containing chitin nanofibers, and method for producing chitosan nanofibers, composite material and coating composition each containing chitosan nanofibers

Life of this patent

Abstract

Claims1