Polymeric material for container

Patent metadata

Field	Value
Publication number	US-9447248-B2
Application number	US-201414331066-A
Country	US
Kind code	B2
Filing date	Jul 14, 2014
Priority date	Jul 12, 2013
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

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 formulation comprising
(a) at least one high density polyethylene (HDPE) base resin,
(b) a chemical blowing agent which is up to about 2 wt % of the formulation,
(c) a physical blowing agent,
(d) a nucleating agent which is up to about 15 wt % of the formulation,
(e) a slip agent which is up to about 3 wt % of the formulation, and
(f) a colorant which is up to about 4 wt % of the formulation,
wherein the formulation has a density of about 0.4 g/cm 3 to about 0.9 g/cm 3 , the HDPE base resin is about 50 wt % to about 99.9 wt % of the formulation, and the formulation is non-aromatic.

2. The formulation of claim 1 , wherein the HDPE is a high melt strength HDPE.

3. The formulation of claim 1 , wherein the HDPE is long-chain branching HDPE.

4. The formulation of claim 1 , wherein the HDPE is a hexene copolymer.

5. The formulation of claim 4 , wherein the HDPE base resin is about 85 wt % to about 99.9 wt % of the formulation.

6. The formulation of claim 5 , wherein the HDPE base resin is about 10% to about 100% virgin HDPE.

7. The formulation of claim 1 , wherein the chemical blowing agent is about 0.1 wt % to about 2 wt % of the formulation.

8. The formulation of claim 1 , wherein the nucleating agent is selected from the group consisting of talc, CaCO 3 , mica, and mixtures of at least two of the foregoing.

9. The formulation of claim 1 , wherein the nucleating agent is about 0.1 wt % to about 7 wt % of the formulation.

10. The formulation of claim 9 , wherein the formulation lacks talc.

11. The formulation of claim 1 , wherein the base resin is 100% virgin HDPE.

12. The formulation of claim 1 , wherein the HDPE base resin comprises a first HDPE base resin that comprises 100% virgin HDPE and a second HDPE base resin that comprises regrind.

13. A formulation comprising at least one high density polyethylene (HDPE) base resin, a chemical blowing agent, a physical blowing agent, a nucleating agent, a slip agent, and a colorant, wherein
(a) the HDPE base resin is about 80 wt % to about 99.9 wt % of the formulation,
(b) the chemical blowing agent is up to about 2 wt % of the formulation,
(c) the nucleating agent is up to about 15 wt % of the formulation,
(d) the slip agent is up to about 3 wt % of the formulation,
(e) the colorant is up to about 4 wt % of the formulation, and wherein the formulation has a density of about 0.4 g/cm 3 to about 0.9 g/cm 3 , and wherein the formulation is non-aromatic.

14. The formulation of claim 13 , wherein (a) the HDPE is about 95 wt % of the formulation, (b) the chemical blowing agent is about 1.5 wt % of the formulation, (c) the nucleating agent is about 0.5 wt % of the formulation, (d) the slip agent is about 2 wt % of the formulation, and (e) the colorant is about 1 wt % of the formulation.

15. The formulation of claim 1 , wherein the formulation has a density of about 0.5 g/cm 3 to about 0.75 g/cm 3 .

16. The formulation of claim 1 , wherein the physical blowing agent is selected from the group consisting of N 2 , CO 2 , helium, argon, and air.

17. The formulation of claim 1 , wherein the physical blowing agent is N 2 or CO 2 .

18. The formulation of claim 1 , wherein the physical blowing agent is introduced to the formulation as a supercritical fluid.

19. The formulation of claim 17 , wherein the physical blowing agent is introduced to the formulation as a supercritical fluid.

20. The formulation of claim 1 , wherein the physical blowing agent is introduced to the formulation at a rate of about 0.02 pounds per hour to about 1.3 pounds per hour.

21. The formulation of claim 1 , wherein the physical blowing agent is introduced to the formulation at a rate of about 0.05 pounds per hour to about 0.15 pounds per hour.

22. The formulation of claim 19 , wherein the physical blowing agent is introduced to the formulation at a rate of about 0.05 pounds per hour to about 0.15 pounds per hour.

23. The formulation of claim 1 , wherein the HDPE base resin is about 92 wt % to about 99.9 wt % of the formulation.

24. A formulation comprising
(a) at least one high density polyethylene (HDPE) base resin,
(b) a chemical blowing agent which is up to about 2 wt % of the formulation,
(c) a physical blowing agent,
(d) a nucleating agent which is up to about 15 wt % of the formulation, and
(e) a slip agent which is up to about 3 wt % of the formulation,
wherein the formulation has a density of about 0.4 g/cm 3 to about 0.9 g/cm 3 , and the HDPE base resin is about 92 wt % to about 99.9 wt % of the formulation.

Assignees

• Berry Plastics Corp

Inventors

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

Classifications

• C08J9/0023 Primary

  containing oxygen · CPC title

• C08J2201/03

  Extrusion of the foamable blend · CPC title

• C08J2203/06

  CO2, N2 or noble gases · CPC title

• C08J2203/04

  N2 releasing, ex azodicarbonamide or nitroso compound · CPC title

• C08J9/10 Primary

  developing nitrogen {, the blowing agent being a compound containing a nitrogen-to-nitrogen bond} · CPC title