Patent ID: 7294655

Claim:
Expandable polystyrene particles containing a blowing agent for forming a foam container in a molding process and coated with a coating composition, said coating composition consisting of a liquid part and a solid part; said liquid part consisting of: a) greater than 0.01% by weight based on the weight of the particles, of a liquid polyethylene glycol having an average molecular weight ranging from about 200 to about 800; and said solid part consisting of: b) greater than 0.01% by weight based on the weight of the particles, of polyolefin wax; c) greater than 0.01% by weight, based on the weight of the particles, of a metal salt of higher fatty acids selected from the group consisting of zinc, magnesium, calcium, and aluminum salt of stearic, lauric, and myristic acid; and optionally d) a solid polyethylene glycol having an average molecular weight of from about 900 to about 10,000; and e) a fatty bisamide or fatty amide; wherein said polyolefin wax of component b) is polyethylene wax having a particle size ranging from about 6 microns to about 60 microns and an average molecular weight of about 650 to about 1000, and wherein said foam container is constructed to hold foods and liquids and wherein said coating composition improves at least the leakage resistance and rim strength of said foam container.