Foamed polypropylene with improved cell structure
AssigneeFina Technology, Inc.
InventorsMichael Musgrave, John Ashbaugh, Lu Kelly
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Abstract
Alicyclic carboxylates, such as alicyclic norbonane sodium dicarboxylate, may be used in relatively small amounts as crystallization nucleating agents for foamed polypropylene. The alicyclic carboxylates give improved cell structures at lower proportions than conventional crystallization nucleating agents. The use of alicyclic carboxylate crystallization nucleating agents together with conventional nucleating agents may help give lower density polypropylene foams across a broader melt temperature range.
Claims36
A method for producing foamed polypropylene comprising foaming polypropylene in the presence of an alicyclic carboxylate crystallization nucleating agent and a blowing agent.
A method for producing foamed polypropylene comprising foaming polypropylene in the presence of less than about 0.05 wt % of an alicyclic carboxylate crystallization nucleating agent, a second crystallization nucleating agent different from the alicyclic carboxylate, and a blowing agent.
A polypropylene resin for foaming applications comprising polypropylene and alicyclic carboxylate crystallization nucleating agent.
The resin of claim 16 further comprising a second crystallization nucleating agent different from the alicyclic carboxylate.
A polypropylene resin for foaming applications comprising polypropylene and less than about 0.05 wt % based on the polypropylene, of an alicyclic carboxylate crystallization nucleating agent and a second crystallization nucleating agent different from the alicyclic carboxylate.
An extruded foam sheet made by the method comprising foaming and extruding polypropylene in the presence of an alicyclic carboxylate crystallization nucleating agent and a blowing agent.
A molded article made by the method comprising foaming and molding polypropylene in the presence of an alicyclic carboxylate crystallization nucleating agent and a blowing agent.
Dependencies are inferred from the claim text.