Cellulosic fiber- and chitosan-based composite material and a method for the preparation thereof
CA 1330916 C · Owner: Japan As Represented By Director General Of Agency Of Industrial Science And Technology · Inventors: Hosokawa, Jun; Nishiyama, Masashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The composite material of the invention is a sheet of cellulose fibers impregnated with chitosan of at least 40% deacetylation and further impregnated with a higher fatty acid such as stearic acid by treating with an organic solution thereof. Different from conventional paper and films of plastic resins, the composite sheet of the invention has a high strength even in a wet condition and still is biodegradable, for example, in wet soils to cause no problems of environmental pollution by the waste thereof left in environments. Therefore, the composite sheet of the invention is useful as a wrapping material of foods sheet materials, for agricultural uses and other temporary or seasonal uses.
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted July 26, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 26, 2011.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.