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Biodegradable plastics

  • US 20040249065A1
  • Filed: 06/09/2003
  • Published: 12/09/2004
  • Est. Priority Date: 06/09/2003
  • Status: Abandoned Application
First Claim
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1. A method for the preparation of biodegradable plastics, said method comprising:

  • (I) providing a suspension in a basic aqueous carrier of a finely divided natural material containing a saccharide selected from the group consisting of (i) polysaccharides, (ii) oligosaccharides, and (iii) a combination of (i) and (ii);

    (II) adding water to the suspension;

    (III) agitating the suspension for a period of time;

    (IV) subjecting the product resulting from step (III) to derivatization selected from the group consisting of;

    (A) acylation using a material selected from the group consisting of cyclic anhydrides selected from the group consisting of (i) maleic anhydride, (ii) succinic anhydride, (iii) glutaric anhydride, (iv) phthalic anhydride and, (v) derivatives of (i), (ii), (iii), and (iv);

    (B) carboxymethylation using materials selected from the group consisting of;

    (i) haloalkanoic acids and (ii) salts of haloalkanoic acids, and, (C) oxidation using an oxidizing agent selected from the group consisting of;

    (a) hypochlorites;

    (b) hydrogen peroxide;

    (c) ozone and (d) air, to provide a solid anionic material, and thereafter, (V) combining the material resulting from (IV) with a protein and allowing the resulting material and the protein to react with each other.

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