Patent ID: 7785711
Filing Date: 2010-08-31
Classification: C08J,Y10T

Abstract:
1. A method for improving the resistance to leakage of a foam container comprising: obtaining expandable polystyrene particles having a diameter from about 0.008 to about 0.03 inches; impregnating the expandable polystyrene particles with a blowing agent; applying a coating composition to the expandable polystyrene particles; pre-expanding the expandable polystyrene particles to a density of from about 2 to about 12 pounds per cubic foot to form pre-expanded particles; and heating the pre-expanded particles in a closed mold to further expand and form a foam container; 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.