US 2025/0353216 A1 · EXPANDED POLYPROPYLENE FOAM TRAY

Abstract

In one aspect, a method for forming a foamable polypropylene extrusion mixture includes providing a polypropylene resin and blending a nucleating agent, a polymer stabilizer, and a physical blowing agent with the polypropylene resin. In another aspect, a method for forming a foamable polypropylene extrusion mixture includes providing a polypropylene resin and blending a nucleating agent, a polymer stabilizer, a physical blowing agent, and a chemical foaming agent with the polypropylene resin. In further aspects, a foamable polypropylene extrusion mixture and foam articles are provided. The foamable polypropylene extrusion mixtures are extrudable to form a polypropylene foam sheet or web which is thermoformable to produce a polypropylene foam packaging tray having superior rigidity and puncture resistance.

Claims29

Dependent claims

A method for forming a foamable polypropylene extrusion mixture, comprising:

providing a polypropylene resin;
heating the polypropylene resin and blending a nucleating agent into the polypropylene resin;
blending a polymer stabilizer into the polypropylene resin;
blending a physical blowing agent into the polypropylene resin;
wherein the foamable polypropylene extrusion mixture is configured to produce a foam article having a maximum compressive load which is greater than or equal to 15 N and less than or equal to 100 N;
and
wherein a total amount of ethylene-derived polymer content in the extrusion mixture is less than or equal to 3% by weight.

4 more elements

Dependencies are inferred from the claim text.

Expanded polypropylene foam tray

Life of this patent

Expanded polypropylene foam tray

Life of this patent

Abstract

Claims29