Biobased, biodegradable compositions for making articles

A process to make a biodegradable article that is water stable, the process comprising:

• a. combining (i) a carrageenan and a chitosan or a chitin, (ii) at least one plasticizer, (iii) at least one filler, and (iv) at least one anhydride crosslinker, so as to make a pre-process mixture;
• and
• b. optionally, blending the pre-process mixture;
• c. optionally, compounding the pre-process mixture into a pellet;
• d. forming the pre-process mixture or pellet into a shape;
• and
• e. drying the shape to form the water stable article having a covalent adaptable network,
• wherein the carrageenan and the chitosan or the chitin form an electrostatic network, and the anhydride crosslinker reacts with the carrageenan and the chitosan or the chitin to form a network of covalent bonds,
• wherein the carrageenan is present in an amount of 10 wt. % to 20 wt. % of the pre-process mixture, the chitosan or the chitin is present in an amount of 10 wt. % to 20 wt. % of the pre-process mixture, the at least one plasticizer is a glycerol and the glycerol is present in an amount of 5 wt. % to 20 wt. % of the pre-process mixture, the at least one filler is a calcium carbonate and the calcium carbonate is present in an amount of 5 wt. % to 20 wt. % of the pre-process mixture, and the at least one anhydride crosslinker is a succinic anhydride present in an amount of 1.5 wt. % to 3.5 wt % of the pre-process mixture.