Biodegradable thermosetting chitosan-based polymerizable composition and process of using same to form a mold casted object
Assignee1263349 Ontario Inc.
InventorAlexander Niall May
Life of this patent
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Abstract
The present invention provides a chitosan-based composition that can be converted into a self-supporting casted object having good tensile and compressive strength that can also biodegrade at the end of its lifecycle. The composition comprises entirely bio-based or bio-sourced reagents that can be converted to the final product via a polymerization process that does not require the addition of inorganic catalysts, synthetic materials, or otherwise hazardous chemicals to strengthen or modify its water resistance.
Claims20
A composition for use in preparing a thermoset mold-casted object, the composition comprising:
- from about 0.9 to about 1.1 parts chitosan;
- from about 0.9 to about 1.1 parts powdered lignocellulosic material;
- from about 1.75 to about 2.25 parts polycarboxylic acid;
- from about 0.75 to about 1.25 parts polyol;
- from about 1.3 to about 1.9 parts of an organic acid component;
- and
- from about 1 to about 2 parts water.
A process for preparing a thermoset mold-casted object, comprising the steps:
- providing a mixture comprising from about 0.9 to about 1.1 parts chitosan, from about 0.9 to about 1.1 parts powdered lignocellulosic material, from about 1.75 to about 2.25 parts polycarboxylic acid, and from about 0.75 to about 1.25 parts polyol;
- stirring the mixture until a paste is formed;
- adding from about 1 to about 2 parts distilled water, and from about 1.3 to about 1.9 parts of an organic acid component to the paste mixture;
- stirring the resulting mixture to form an uncured composite mixture as a sticky paste;
- placing the uncured composite mixture into a mold;
- and
- curing the molded composite mixture in an oven at a temperature of about 160° C. to about 185° C. for a time sufficient to form the thermoset mold-casted object.
Dependencies are inferred from the claim text.