Polypropylene sheets and articles

Patent metadata

Field	Value
Publication number	US-12240953-B2
Application number	US-202318399886-A
Country	US
Kind code	B2
Filing date	Dec 29, 2023
Priority date	Feb 6, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

A sheet of polymeric material is made using an extruding process and articles are formed from the sheet of polymeric material. The sheet of polymeric material and the articles comprise one or more polypropylene resins. In some embodiments, the sheet of polymeric material and the articles formed form the sheet of polymeric material are transparent.

First claim

The invention claimed is:

1. An article made of polymeric materials, the article comprising
a polypropylene base resin,
wherein a portion of the article is arranged to move from a first arrangement in which the portion has a first transparency to a second arrangement in which the portion has a second transparency that is different than the first transparency in response to a first deformation force being applied to the portion,
wherein the first transparency is defined at least by a haze between about 10% and about 50% as measured using ASTM D 1003 procedure B, and a haze of the second transparency is different than the haze of the first transparency so that the portion is at least partially opaque in response to being in the second arrangement,
wherein the portion is arranged to move from the second arrangement to a third arrangement in response to a second deformation force, the portion has a third transparency in the third arrangement, and the third transparency is different than the second transparency, wherein the haze of the portion in the second arrangement is greater than the haze of the portion in the first arrangement and the third arrangement.

2. The article of claim 1 , wherein the portion of the article is formed to define stress concentrator joints that focus stresses in the portion to cause the first transparency of the portion of the article to change in response to the portion moving from the first arrangement to the second arrangement.

3. The article of claim 2 , wherein the portion of the article includes a cap spaced apart from a body of the article and a plurality of panels that each extend between and interconnect the cap and the body, the plurality of panels are arranged to surround the cap and adjacent panels are coupled to one another to form the stress concentrator joints.

4. The article of claim 3 , wherein the cap is coupled to the plurality of panels along a first curved edge.

5. The article of claim 4 , wherein the cap includes an upper surface, a lower surface, and a side surface that extends between and interconnects the upper surface and the lower surface, the lower surface couples to the plurality of panels at the first curved edge, and the side surface couples to the upper surface at a second curved edge.

6. The article of claim 3 , wherein the adjacent panels of the plurality of panels are coupled to one another along linear geometries to form the stress concentrator joints.

7. The article of claim 2 , wherein the polypropylene base resin comprises a polypropylene impact copolymer.

8. The article of claim 7 , wherein the article further comprises a polypropylene homopolymer secondary resin.

9. The article of claim 2 , wherein the article comprises about 1% to about 20% by weight rubber.

10. An article made of polymeric materials, the article comprising
a polypropylene impact copolymer base resin,
wherein a portion of the article is arranged to move from a first arrangement in which the portion has a first transparency to a second arrangement in which the portion has a second transparency that is different than the first transparency in response to a first deformation force being applied to the portion,
wherein the portion is arranged to move from the second arrangement to a third arrangement in response to a second deformation force, the portion has a third transparency in the third arrangement, and the third transparency is different than the second transparency, wherein the haze of the portion in the second arrangement is greater than the haze of the portion in the first arrangement and the third arrangement.

11. The article of claim 10 , wherein the first transparency is defined at least by a haze between about 10% and about 50% as measured using ASTM D 1003 procedure B, and a haze of the second transparency is greater than the haze of the first transparency so that the portion is at least partially opaque in response to being in the second arrangement.

12. The article of claim 11 , wherein the portion of the article is formed to define stress concentrator joints that focus stresses in the portion to cause the first transparency of the portion of the article to change in response to the portion moving from the first arrangement to the second arrangement.

13. The article of claim 12 , wherein the portion of the article includes a cap spaced apart from a body of the article and a plurality of panels that each extend between and interconnect the cap and the body, the plurality of panels are arranged to surround the cap and adjacent panels are coupled to one another to form the stress concentrator joints.

14. The article of claim 13 , wherein the cap is coupled to the plurality of panels along a first curved edge.

15. The article of claim 14 , wherein the cap includes an upper surface, a lower surface, and a side surface that extends between and interconnects the upper surface and the lower surface, the lower surface couples to the plurality of panels at the first curved edge, and the side surface couples to the upper surface at a second curved edge.

16. The article of claim 13 , wherein the adjacent panels of the plurality of panels are coupled to one another along linear geometries to form the stress concentrator joints.

17. The article of claim 12 , wherein the article comprises a polypropylene homopolymer secondary resin.

18. The article of claim 17 , wherein the article comprises about 50% to about 80% by weight the base resin and about 20% to about 40% by weight the secondary resin.

Assignees

• Berry Global Inc

Inventors

• Peng Yucheng
• Eickhoff Jonathan
• Dewig Ryan
• Mann Jeffrey A
• Wilson Debra R

Classifications

• C08L23/14

  Copolymers of propene (C08L23/16 takes precedence) · CPC title

• C08L2201/10

  Transparent films; Clear coatings; Transparent materials · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L23/12

  Polypropene · CPC title

• C08J2323/14

  Copolymers of propene (C08J2323/16 takes precedence) · CPC title