Polymeric material for an insulated container

Patent metadata

Field	Value
Publication number	US-9562140-B2
Application number	US-201414462073-A
Country	US
Kind code	B2
Filing date	Aug 18, 2014
Priority date	Aug 16, 2013
Publication date	Feb 7, 2017
Grant date	Feb 7, 2017

Abstract

A formulation includes a base resin, a nucleating agent, and a blowing agent. The formulation can be used to form a container.

First claim

The invention claimed is:

1. A polymeric formulation comprising a primary base resin, a secondary base resin, a slip agent, a chemical blowing agent, and a nucleating agent, wherein
the primary base resin is a first homopolymeric polypropylene that is about 50-99.9 wt % of the polymeric formulation,
the secondary base resin is a second homopolymeric polypropylene, different from the first homopolymeric polypropylene, that is up to about 15 wt % of the polymeric formulation,
the slip agent is up to about 10 wt % of the polymeric formulation,
the chemical blowing agent is up to about 10 wt % of the polymeric formulation, and
the nucleating agent is about 0.5-10 wt % of the polymeric formulation, and
wherein the polymeric formulation is non-aromatic and cellular.

2. The polymeric formulation of claim 1 , wherein the primary and secondary base resins combined are about 95 to 98 wt % of the polymeric formulation.

3. The polymeric formulation of claim 2 , wherein the primary and secondary base resins combined are about 96 wt % to about 97 wt % of the polymeric formulation.

4. The polymeric formulation of claim 1 , wherein the secondary base resin is up to about 10 wt % of the polymeric formulation.

5. The polymeric formulation of claim 1 , wherein the slip agent is about 1 to 3 wt % of the polymeric formulation.

6. The polymeric formulation of claim 1 further comprising a colorant, wherein the colorant is up to about 10 wt % of the polymeric formulation.

7. The polymeric formulation of claim 6 , wherein the colorant is up to about 5 wt % of the polymeric formulation.

8. The polymeric formulation of claim 7 , wherein the colorant is about 0.5 to 2 wt % of the polymeric formulation.

9. The polymeric formulation of claim 1 , wherein the nucleating agent is about 0.5 to 5 wt % of the polymeric formulation.

10. The polymeric formulation of claim 9 , wherein the chemical blowing agent is about 0.1 to 2 wt % of the polymeric formulation.

11. The polymeric formulation of claim 10 , wherein the chemical blowing agent is about 0.1 wt % of the polymeric formulation.

12. The polymeric formulation of claim 1 , wherein the nucleating agent is selected from the group consisting of a chemical nucleating agent, a physical nucleating agent, and a combination of a chemical nucleating agent and a physical nucleating agent.

13. The polymeric formulation of claim 12 , wherein the chemical nucleating agent is citric acid or a citric acid-based material.

14. The polymeric formulation of claim 12 , wherein the physical nucleating agent is selected from the group consisting of talc, CaCO 3 , mica, kaolin clay, chitin, aluminosilicates, graphite, cellulose, and mixtures of at least two of the foregoing.

15. The polymeric formulation of claim 1 , further comprising a physical blowing agent, wherein the physical blowing agent is at least one gas that is introduced as a liquid under pressure into a molten resin.

16. The polymeric formulation of claim 1 , wherein the slip agent is selected from the group consisting of an amide of a fatty acid, a low molecular weight amide, and a fluoroelastomer.

17. The polymeric formulation of claim 1 , wherein the secondary base resin is a high crystallinity polypropylene.

18. The polymeric formulation of claim 15 , wherein the physical blowing agent is CO 2 or N 2 .

19. A polymeric formulation comprising a primary base resin, a secondary base resin, a slip agent, a colorant, a chemical blowing agent, and a nucleating agent, wherein
the primary base resin is a first homopolymeric polypropylene that is about 86 wt % or about 87 wt % of the polymeric formulation,
the secondary base resin is a second homopolymeric polypropylene, different from the first homopolymeric polypropylene, that is up to about 10 wt % of the polymeric formulation,
the slip agent is about 2 wt % of the polymeric formulation,
the colorant is about 0.5 wt % of the polymeric formulation,
the chemical blowing agent is about 0.1 wt % of the polymeric formulation, and
the nucleating agent is about 0.5 wt % of the polymeric formulation, and
wherein the polymeric formulation is non-aromatic and cellular.

20. The polymeric formulation of claim 1 , wherein the polymeric formulation has a density of about 0.05 g/cm 3 to about 0.19 g/cm 3 .

21. The polymeric formulation of claim 1 , wherein the polymeric formulation has a density of about 0.155 g/cm 3 to about 0.19 g/cm 3 .

22. The polymeric formulation of claim 1 , wherein the polymeric formulation has a density of about 0.1902 g/cm 3 .

Assignees

• Berry Plastics Corp

Inventors

• Leser Chris K
• Driskill Philip A
• Wallace Charles T
• Euler John B
• Paladino Jason J
• Maravich Milan C
• Davis Daniel O
• Mann Jeffrey A
• Bowlds Randy A
• Contrada Svetlana I
• Sun David Dezhou

Classifications

• C08J9/0028

  containing nitrogen · CPC title

• C08J9/06 Primary

  by a chemical blowing agent · CPC title

• C08J9/0061

  characterized by the use of several polymeric components · CPC title

• C08J2423/12

  Polypropene · CPC title

• C08J2323/12

  Polypropene · CPC title