Biodegradable coating composition, method for preparing same, and biodegradable article using same

A process for preparing a biodegradable coating composition, which comprises:

• (1) stirring a polyhydroxyalkanoate (PHA) resin;
• (2) adding a surfactant;
• (3) adding a rheology modifier;
• and
• (4) adding inorganic particles,
• wherein steps (2) to (4) are carried out simultaneously, sequentially, or as selected at random, and the polyhydroxyalkanoate resin is a copolymerized polyhydroxyalkanoate resin comprising a 4-hydroxybutyrate (4-HB) repeat unit and has a weight average molecular weight of 10,000 g/mole to 1,200,000 g/mole.

A biodegradable article, which comprises a substrate;

• and a biodegradable coating layer,
• wherein the biodegradable coating layer comprises a polyhydroxyalkanoate (PHA) resin;
• a surfactant;
• inorganic particles;
• and a rheology modifier, and the polyhydroxyalkanoate resin is a copolymerized polyhydroxyalkanoate resin comprising a 4-hydroxybutyrate (4-HB) repeat unit and has a weight average molecular weight of 10,000 g/mole to 1,200,000 g/mole.