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US 9,957,365 B2Granted
Cellular polymeric material
AssigneeBerry Plastics Corporation
InventorsDavid Dezhou Sun, John B Euler, Chris K Leser, Charles T Wallace
Life of this patent
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Abstract
A formulation includes a polymeric material, a nucleating agent, and a surface active agent. The formulation can be used to form an insulated container.
Claims3
An insulative cellular polypropylene-based extruded material comprising
- i) a first polymer material comprising at least one high melt strength polypropylene homopolymer,
- ii) a second polymer material comprising at least one polymer selected from the group consisting of crystalline polypropylene homopolymer, impact polypropylene copolymer, and mixtures thereof,
- iii) at least one nucleating agent, and
- iv) at least one slip agent,
- wherein the extruded material has a cell aspect ratio in a cross direction of about 2.75 to about 3.75, a cell density of about 800,000 cells/in3 and wherein the extruded material extruded through an extruder die lip at a die exit angle of 20° to 60° lacks surface indentations of greater than 5 microns when a sheet of the extruded material is curved to form a round article.
2 more elements
A micro-creasing or macro-creasing insulative cellular polypropylene-based extruded material having a cell density of about 700,000 cells/in3 to about 2,000,000 cells/in3 and a cell aspect ratio in a machine direction of about 2.75 to about 4.5, and
- wherein the extruded material extruded through an extruder die lip at a die exit angle of 20° to 60° lacks surface indentations of greater than 5 microns when a sheet of the extruded material is curved to form a round article.
Dependencies are inferred from the claim text.