Patent ID: 7361294
Filing Date: 2008-04-22
Classification: B29C,B29K,Y10T

Abstract:
1. A method for molding a microcellular polymeric article comprising: forming in polymer processing apparatus a non-nucleated, homogeneous, fluid, single-phase solution of a precursor of microcellular polymeric material and a blowing agent; and injecting the non-nucleated, homogeneous, fluid, single-phase solution into a molding chamber, wherein the non-nucleated, homogeneous, fluid, single-phase solution injected into the molding chamber is nucleated by a pressure drop in a nuclear position immediately upstream of the molding chamber during injection into the molding chamber to form within the molding chamber a nucleated microcellular polymeric material precursor; and allowing the mixture to solidify as a microcellular polymeric article in the molding chamber.