Patent ID: 6583190
Filing Date: 2003-06-24
Classification: C08J

Abstract:
A process for producing an extruded, low density polyolefin foam product, said process comprising the steps of:a) mixing a blowing agent with a plasticized polyolefin resin including a fatty ester based aging modifier, the blowing agent comprising a blend of carbon dioxide and a hydrocarbon selected from among the group consisting of ethane, n-butane, isobutane, propane, and mixtures thereof, wherein said carbon dioxide is present in an amount of from about 1 to 25% by weight of the blowing agent; b) extruding the mixture of resin and blowing agent at a rate of from about 150 kg/hr to 500 kg/hr; and c) expanding the mixture so as to produce a dimensionally stable foam sheet product of thickness less than 0.5 inches.