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US 2004/0006148 A1Published application
Processes and products for foaming thermoplastic materials using a pellet or powder as a vehicle to deliver a physical foaming agent, and products formed therewith
AssigneePolymer 5
InventorsRichard E. Harris, Hariharan Rajaraman, Duane E. Peterson
Life of this patent
Estimating the term…
Abstract
In a process for forming low-density foamed articles, a blend of foamable thermoplastic material and physical foaming agent concentrate is mixed and melted and expanded to form an extruded foam article.
Claims48
A process for preparing a foam of a thermoplastic material, comprising:
- mixing a physical foaming agent concentrate, comprising a solid carrier vehicle loaded with at least one physical foaming agent, with at least one thermoplastic material to form a mixture;
- heating the mixture to a temperature above the melting point of the at least one thermoplastic material and at which the physical foaming agent concentrate releases the at least one physical foaming agent;
- and
- releasing the heated mixture to reduced-pressure conditions.
1 more element
A physical foaming agent concentrate, comprising a solid carrier vehicle loaded with at least one physical foaming agent in a form that can be mixed with at least one thermoplastic material to form a mixture and heated to release the at least one physical foaming agent from the vehicle.
Dependencies are inferred from the claim text.