Polymeric material for container

Patent metadata

Field	Value
Publication number	US-10947357-B2
Application number	US-201916356423-A
Country	US
Kind code	B2
Filing date	Mar 18, 2019
Priority date	Jul 12, 2013
Publication date	Mar 16, 2021
Grant date	Mar 16, 2021

Abstract

A formulation for producing a polymeric material including high-density polyethylene, a chemical blowing agent, and other optional components is described.

First claim

The invention claimed is:

1. A non-aromatic formulation for a container comprising
at least one high density polyethylene (HDPE) resin which is about 50 wt % to about 99.9 wt % of the formulation,
a chemical blowing agent which is up to about 2 wt % of the formulation, and
a nucleating agent which is up to about 15 wt % of the formulation,
wherein the formulation further comprises regrind from containers previously made of the formulation described above.

2. The non-aromatic formulation of claim 1 , wherein the container has a container density of about 0.4 g/cm 3 to about 0.9 g/cm 3 .

3. The non-aromatic formulation of claim 2 , wherein the formulation has a formulation density of about 0.4 g/cm 3 to about 0.9 g/cm 3 .

4. The non-aromatic formulation of claim 3 , wherein a ratio of the container density to the formulation density is about 1.0 to about 2.3.

5. The non-aromatic formulation of claim 3 , wherein the container density is greater than the formulation density.

6. The non-aromatic formulation of claim 5 , further comprising a physical blowing agent.

7. The non-aromatic formulation of claim 6 , wherein the regrind is about 10 wt % to about 50 wt % of the formulation.

8. The non-aromatic formulation of claim 7 , further comprising a colorant which is up to about 4 wt % of the formulation.

9. The non-aromatic formulation of claim 1 , wherein the formulation has a formulation density of about 0.4 g/cm 3 to about 0.9 g/cm 3 .

10. The non-aromatic formulation of claim 9 , wherein a container density is greater than the formulation density.

11. The non-aromatic formulation of claim 10 , wherein at least one high density polyethylene (HDPE) resin is a HDPE homopolymer.

12. The non-aromatic formulation of claim 10 , wherein the at least one high density polyethylene (HDPE) resin is a HDPE copolymer.

13. The non-aromatic formulation of claim 10 , wherein the at least one high density polyethylene (HDPE) resin is about 10% to about 100% virgin HDPE.

14. The non-aromatic formulation of claim 13 , wherein the chemical blowing agent is about 0.1 wt % to about 2 wt % of the formulation.

15. The non-aromatic formulation of claim 14 , wherein the nucleating agent is about 0.5 wt % to about 5 wt % of the formulation.

16. The non-aromatic formulation of claim 15 , wherein the nucleating agent is selected from the group consisting of talc, CaCO 3 , mica, and mixtures of at least two of the foregoing.

17. The non-aromatic formulation of claim 6 , wherein the physical blowing agent is selected from the group consisting of N 2 , CO 2 , helium, argon, air, and mixtures thereof.

18. The non-aromatic formulation of claim 1 , wherein a ratio of a container density to a formulation density is about 1.0 to about 2.3.

19. The non-aromatic formulation of claim 1 , wherein a container density is greater than a formulation density.

20. The non-aromatic formulation of claim 1 , wherein a ratio of a container weight to container density is in a range of about 21 to 26 and density is expressed in grams/cm 3 and container weight is expressed in grams.

Assignees

• Berry Plastics Corp

Inventors

• Sun David Dezhou
• Driskill Philip A
• Cain Tony
• Strasser Rolland

Classifications

• C08J9/122 Primary

  Hydrogen, oxygen, CO2, nitrogen or noble gases · CPC title

• C08J2201/03

  Extrusion of the foamable blend · CPC title

• C08J2423/06

  Polyethene · CPC title

• C08J9/06

  by a chemical blowing agent · CPC title

• C08J9/0066

  Use of inorganic compounding ingredients · CPC title