Patent ID: 7736740
Filing Date: 2010-06-15
Classification: C08J,Y10T

Abstract:
1. A foam container for holding foods and liquids and made from expandable particles consisting of polystyrene, a blowing agent and 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 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; and 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; wherein said polyolefin wax of component b) is polyethylene wax having a particle size ranging from about 6 microns to about 140 microns and an average molecular weight of about 650 to about 30,000, and wherein said coating composition improves at least the leakage resistance of said foam container.