Cyclic olefin copolymers and films prepared therefrom

Patent metadata

Field	Value
Publication number	US-11248113-B2
Application number	US-201916692804-A
Country	US
Kind code	B2
Filing date	Nov 22, 2019
Priority date	Nov 30, 2018
Publication date	Feb 15, 2022
Grant date	Feb 15, 2022

Abstract

The present disclosure provides copolymers comprising from about 0.5 wt % to about 25 wt % cyclic olefin content and films comprising the copolymers. In one embodiment, a copolymer includes a C2-C40 monomer content of from about 75 wt % to about 99.5 wt %; and a C5-C40 cyclic olefin comonomer content of from about 0.5 wt % to about 25 wt %. The copolymer has a density of about 0.91 g/cm3 to about 0.933 g/cm3. Films of the present disclosure can have advantageous mechanical properties (such as melt strength) and optical properties (such as haze %).

First claim

What is claimed is:

1. A copolymer comprising:
a C 2 -C 40 monomer content of from about 75 wt % to about 99.5 wt %; and
a C 5 -C 40 cyclic olefin comonomer content of from about 0.5 wt % to about 25 wt %;
wherein the copolymer has a density of about 0.91 g/cm 3 to about 0.933 g/cm 3 , and the copolymer has a melt strength of from about 7 cN to about 14 cN.

2. The copolymer of claim 1 , wherein the C 2 -C 40 monomer is ethylene.

3. The copolymer of claim 1 , wherein the C 5 -C 40 cyclic olefin comonomer is selected from one or more of dicyclopentadiene, cyclopentene, cycloheptene, cyclooctene, cyclooctadiene, cyclododecene, 7-oxanorbornene, 7-oxanorbornadiene, 1-hydroxy-4-cyclooctene, 1-acetoxy-4-cyclooctene, 5-methylcyclopentene, norbornene, and norbornadiene.

4. The copolymer of claim 3 , wherein the C 5 -C 40 cyclic olefin comonomer is norbornene.

5. The copolymer of claim 1 , wherein the C 5 -C 40 cyclic olefin comonomer content is from about 9 wt % to about 15 wt %.

6. The copolymer of claim 1 , wherein the copolymer has a density about 0.92 g/cm 3 to about 0.933 g/cm 3 .

7. The copolymer of claim 1 , wherein the copolymer has a melt strength of from about 10 cN to about 14 cN.

8. The copolymer of claim 1 , wherein the copolymer has a melt index ratio of from about 25 to about 70.

9. The copolymer of claim 8 , wherein the copolymer has a melt index ratio of from about 28 to about 55.

10. A film comprising the copolymer of claim 1 .

11. The film of claim 10 , wherein the film has a thickness of from about 1 mil to about 20 mils.

12. The film of any of claim 10 , wherein the film has a total haze of about 1% to about 25%.

13. The film of claim 12 , wherein the film has a total haze of about 3% to about 10%.

14. The film of claim 10 , wherein the film has an internal haze of from about 1% to about 10%.

15. The film of claim 14 , wherein the film has an internal haze of from about 1% to about 6%.

16. The film of claim 10 , wherein the film has a 1% Secant Modulus MD of from about 20,000 psi to about 75,000 psi.

17. The film of claim 10 , wherein the film has a hot tack strength of from about 2 (N/25.4 mm) to about 18 (N/25.4 mm) at a temperature of 125° C.

18. The film of claim 17 , wherein the film has a hot tack strength of from about 10 (N/25.4 mm) to about 13 (N/25.4 mm) at a temperature of 125° C.

19. The film of any of claim 10 , wherein the film has a heat seal strength of from about 2 lbs/in 2 to about 12 lbs/in 2 at a seal bar temperature of 130° C.

20. The film of claim 19 , wherein the film has a heat seal strength of from about 6 lbs/in 2 to about 9 lbs/in 2 at a seal bar temperature of 130° C.

21. The film of claim 10 , wherein the film has an MD Elmendorf Tear of from about 20 g/mil to about 150 g/mil.

22. The film of claim 10 , wherein the film has an MD Elmendorf Tear of from about 150 g/mil to about 225 g/mil.

23. The film of claim 10 , wherein the film has a Dart Impact of from about 80 g/mil to about 250 g/mil.

24. The film of claim 10 , wherein the film has a Dart Impact of from about 250 g/mil to about 450 g/mil.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Fiscus David M
• Jiang Peijun
• Yang Yong

Classifications

• C08J2323/08

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

• C08J2423/08

  Copolymers of ethene (C08J2423/16 takes precedence) · CPC title

• C08F232/04

  having one carbon-to-carbon double bond · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08F210/02

  Ethene · CPC title