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Method for preparing a chitosan-based porous layer

  • US 10,363,690 B2
  • Filed: 08/01/2013
  • Issued: 07/30/2019
  • Est. Priority Date: 08/02/2012
  • Status: Active Grant
First Claim
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1. A method for preparing a chitosan-based porous layer which has been compressed, neutralized and washed, comprising the following steps:

  • a) preparing a chitosan solution free of any other polymer, including a chitosan concentration ranging from 1.0% to 5% by weight, relative to a total weight of the solution and having a pH from 3 to 5,b) pouring the chitosan solution into a mold in order to form a layer,c) lyophilizing the layer obtained in b) to obtain a porous layer,d) compressing the porous layer obtained in c) to obtain a compressed porous layer including a density of greater than or equal to 0.65 g/cm3,e) neutralizing the compressed porous layer obtained in d) by using a NH4OH solution comprising a NH4OH concentration ranging from 0.6 to 2 mold to obtain a neutralized compressed porous layer, and,f) subjecting the neutralized compressed porous layer obtained in e) to one or more washing steps.

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