Uniform small cell foams and a continuous process for making same
Assignee3M Innovative Properties Company
InventorsMark David Gehlsen, David Loren Vall, Craig Allen Perman, Bonnie Weiskopf Albrecht
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Abstract
A continuous method for making foams having uniform and/or small cell sizes and articles made with these foams are described. The method allows for adjusting or controlling cell size and cell size distribution by controlling temperature and/or blowing agent concentration. The foams feature small and/or uniform cell sizes and may be comprised of amorphous thermoplastic polymers, pressure sensitive adhesive compositions, and immiscible thermoplastic polymer compositions. A method for coextruding the foams is also described.
Claims4
A foam material comprised of a pressure sensitive adhesive foam layer made without a material whose primary function is as a nucleating agent, said foam having cell size distribution polydispersities of 1.0 to 2.0.
Dependencies are inferred from the claim text.