Biodegradable compositions and articles made from cellulose acetate

A foamable composition, comprising:

• (1) a cellulose acetate having a degree of substitution of acetyl (DSAc) between 2.2 to 2.6;
• (2) 5 to 40 wt % of a plasticizer;
• (3) 0.1 to 3 wt % of a nucleating agent;
• and
• (4) 0.1 to 3 wt % a chemical blowing composition, comprises:
• (i) 25 to 75 wt % of a blowing agent, and
• (ii) 25 to 75 wt % of a carrier polymer having a melting point that is no more than 150° C.,
• wherein the proportions of the blowing agent and the carrier polymer are based on the total weight of the chemical blowing composition,
• wherein the proportions of the plasticizer, nucleating agent and chemical blowing composition are based on the total weight of the foamable composition,
• wherein the blowing agent comprises sodium bicarbonate, citric acid or a combination thereof,
• wherein the carrier polymer comprises a polybutylene succinate, a polycaprolactone, or combinations thereof, and
• wherein the nucleating agent comprises a particulate composition with a median particle size less than 2 microns, and wherein the nucleating agent comprises a magnesium silicate, a silicon dioxide, a magnesium oxide, or combinations thereof.