Propylene polymers

Patent metadata

Field	Value
Publication number	US-10100183-B2
Application number	US-201314437868-A
Country	US
Kind code	B2
Filing date	Nov 25, 2013
Priority date	Dec 3, 2012
Publication date	Oct 16, 2018
Grant date	Oct 16, 2018

Abstract

This invention relates in one aspect to propylene polymers comprising propylene, said polymers having a melt flow rate (MFR, ASTM 1238, 230° C., 2.16 kg) of 10 dg/min to 25 dg/min; a Dimensionless Stress Ratio/Loss Tangent Index R 2 at 190° C. from 1.5 to 28; an average meso run length determined by 13 C NMR of at least 70 or higher; and an MFR MFR Ratio of at least 1.0 and optionally, a Loss Tangent, tan δ, at an angular frequency of 0.1 rad/s at 190° C. from 14 to 100. The inventive propylene polymer compositions are useful in in molded articles and non-woven fibers and fabrics.

First claim

The invention claimed is:

1. A propylene polymer composition made with a non-metallocene catalyst comprising at least 90 wt % propylene, said polymer composition having:
a) a melt flow rate (MFR, ASTM 1238, 230° C., 2.16 kg) of 10 dg/min to 25 dg/min;
b) a Dimensionless Stress Ratio/Loss Tangent Index R 2 at 190° C. from 1.5 to 28.0; and
c) an average meso run length determined by 13 C NMR of at least 70, or having a percentage molar meso pentads (mmmm) content of greater than 0.935; or a number of stereo defects from 44 to 145 and a number of regio defects from 0 to 80.

2. The propylene polymer composition of claim 1 , wherein the composition has a MFR Ratio within a range from 1 to 2.4 and greater than 4.5.

3. The propylene polymer composition of claim 1 , where the propylene polymer composition has a Loss Tangent, tan δ, at an angular frequency of 0.1 rad/s at 190° C. from 10 to 100.

4. The propylene polymer composition of claim 1 , where the propylene polymer composition has a Dimensionless Stress Ratio Index R 1 at 190° C. of 1.2 to 5.0.

5. The propylene polymer composition of claim 1 , where the propylene polymer composition has a Dimensionless Shear Thinning Index R 3 at 190° C. of 6 to 15.

6. The propylene polymer composition of claim 1 , where the propylene polymer composition has a Dimensionless Loss Tangent/Elasticity Index R 4 at 190° C. of 1.5 to 25.

7. The propylene polymer composition of claim 1 , where the propylene polymer composition has a T mp (second melt, 1° C./min) of 120° C. or more.

8. The propylene polymer composition of claim 1 , where the propylene polymer composition has an Mw/Mn within a range from 1.0 to 7.0 and/or an Mz/Mw within a range from 1.5 to 4.5.

9. The propylene polymer composition of claim 1 , where the propylene polymer composition has a supercooling parameter SCP (1° C. per minute) of −1° C. or less.

10. The propylene polymer composition of claim 1 , having a 1% secant flexural modulus of 190 kpsi or higher.

11. The propylene polymer composition of claim 1 , having a heat distortion temperature at 66 psi of 95° C. or higher.

12. The propylene polymer composition of claim 1 , where the composition is made with a Ziegler-Natta catalyst.

13. The propylene polymer composition of claim 1 , wherein a reactor-grade propylene polymer having an MFR of less than 8.0 or 6.0 or 4.0 or 3.0 g/10 min is visbroken while under shear and/or extensional flow forces and at a melt at a temperature within the range from 190 or 200 or 210° C. to 250 or 260 or 280° C. to form the propylene polymer composition.

14. A propylene polymer composition comprising at least 90 wt % propylene, said polymer composition having:
a) an MFR in the range from 10 dg/min to 25 dg/min;
b) an average meso run length determined by 13 C NMR of at least 90 or higher; or a total number of defects (stereo and regio) per 10,000 monomers of less than 110; or a percentage molar meso pentads (mmmm) content within a range from 0.935 to 0.980;
or a number of stereo defects from 44 to 145 and a number of regio defects from 0 to 80; and
c) at least one of the following:
1) a Dimensionless Stress Ratio Index R 1 at 190° C. from 1.2 to 4.5; or
2) a Dimensionless Stress Ratio/Loss Tangent Index R 2 at 190° C. from 1.5 to 28; or
3) a Dimensionless Shear Thinning Index R 3 at 190° C. from 6 to 13; or
4) a Dimensionless Loss Tangent/Elasticity Index R 4 at 190° C. from 1.5 to 20; or
5) a Loss Tangent (tan δ) at an angular frequency of 0.1 rad/s at 190° C. from 14 to 90; or

6) a Stress Ratio (SR) at a shear rate of 500 s −1 at 190° C. from 3.0 to 6.0.

15. The propylene polymer composition of claim 14 , wherein the polymer is made from a Ziegler-Natta catalyst.

16. The propylene polymer composition of claim 14 , where the propylene polymer composition has an Mw/Mn within a range from 1.0 to 7.0 and/or an Mz/Mw within a range from 1.5 to 4.5.

17. The propylene polymer composition of claim 14 , where the propylene polymer composition has a supercooling parameter SCP (1° C. per minute) of −1° C. or less.

18. The propylene polymer composition of claim 14 , having a 1% secant flexural modulus of 190 kpsi or higher.

19. The propylene polymer composition of claim 14 , having a heat distortion temperature at 66 psi of 95° C. or higher.

20. A propylene polymer comprising at least 90 wt % propylene, said polymer composition having:
a) a melt flow rate (MFR, ASTM 1238, 230° C., 2.16 kg) of 10 dg/min to 25 dg/min;
b) a Dimensionless Stress Ratio/Loss Tangent Index R 2 at 190° C. from 1.5 to 28.0; and
c) an average meso run length determined by 13 C NMR of at least 70 or higher, or a percentage molar meso pentads (mmmm) content of greater than 0.935, or a number of stereo defects from 44 to 145 and a number of regio defects from 0 to 80;
d) a melting peak temperature T mp (10° C./min) from 153° C. to 190° C.

21. The propylene polymer composition of claim 16 , where the propylene polymer composition has an Mw/Mn within a range from 1.0 to 7.0 and/or an Mz/Mw within a range from 1.5 to 4.5.

22. The propylene polymer composition of claim 16 , where the propylene polymer composition has a supercooling parameter SCP (1° C. per minute) of −1° C. or less.

23. The propylene polymer composition of claim 16 , having a 1% secant flexural modulus of 190 kpsi or higher.

24. The propylene polymer composition of claim 16 , having a heat distortion temperature at 66 psi of 95° C. or higher.

Assignees

• Exxonmobil Chemical Patents Inc

Inventors

• Macdonald Jeanne M
• Doufas Antonios
• Sarrazin Jerome
• Ferry William M
• Ruff Charles J
• Kulkarni Rahul R
• Thurman Derek W
• Mitchell Cynthia A

Classifications

• 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

• C08J2323/08

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

• Y10T428/31938

  Polymer of monoethylenically unsaturated hydrocarbon · CPC title

• C08L23/12 Primary

  Polypropene · CPC title

• C08J5/18

  Manufacture of films or sheets · CPC title