Patent ID: 7226956
Filing Date: 2007-06-05
Classification: C08J,C08L

Abstract:
1. A process for preparing a polymeric foam, the process comprising: (a) melting a high density polyethylene, an alkenyl aromatic polymer and a linear low density polyethylene to form a polymeric composition, the polymeric composition comprising from about 5 to 85 weight percent of high density polyethylene, from about 5 to about 85 weight percent of alkenyl aromatic polymer and from about 5 to about 85 weight percent of the linear low density polyethylene and characterized by Dynamic Mechanical Spectroscopy using a frequency of 1.00 radians/sec and 25 mm parallel plates with a 1.00 mm gap to have a complex viscosity (η*) in the range of 6.0×10 (b) adding a nucleating agent to the polymeric composition; (c) dissolving an effective amount of blowing agent; (d) transferring the mixture of step (c) to an expansion zone; and (e) permitting the mixture of step (d) to expand in the expansion zone to produce the polymeric foam.