Copolymers and films thereof

Patent metadata

Field	Value
Publication number	US-10676550-B2
Application number	US-201615742552-A
Country	US
Kind code	B2
Filing date	Jul 7, 2016
Priority date	Jul 9, 2015
Publication date	Jun 9, 2020
Grant date	Jun 9, 2020

Abstract

Novel copolymers having a density (D) in the range 0.895-0.910 g/cm3, a melt index MI2 (2.16 kg, 190° C.) in the range of 0.01-6 g/10 min, a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and a sealing initiation temperature (SIT) and density (D) satisfying the relationship SIT≤(A×D)−B wherein A is 800° C.×cm3/g and B is 650° C., wherein the SIT (° C.) is determined on a 70 μm film at 0.5N/15 mm and D Is in units of g/cm3 are disclosed. The copolymers may be suitably prepared by use of metallocene catalyst systems and may be used in film applications, in particular as sealing layers for packaging applications.

First claim

The invention claimed is:

1. A copolymer of ethylene and an alpha-olefin, said copolymer having
(a) a density (D) in the range 0.895-0.910 g/cm 3 ,
(b) a melt index MI 2 (2.16 kg, 190° C.) in the range of 0.01-6 g/10 min,
(c) a Compositional Distribution Branch Index (CDBI) in the range 55-85%, and
(d) a sealing initiation temperature (SIT) and density (D) satisfying the relationship
SIT≤( A×D )− B

wherein A is 1700° C.×cm 3 /g and B is 1469° C., and
wherein the SIT (° C.) is determined on a 70 μm film at 0.5N/15 mm and D is in units of g/cm 3 , and
(e) a Crystallizable Species Fraction below 55° C. (CSF55)≥12%.

2. A copolymer according to claim 1 having a Compositional Distribution Branch Index (CDBI) in the range 65-85%.

3. A copolymer according to claim 1 having a density in the range 0.901-0.907 g/cm 3 .

4. A copolymer according to claim 1 having a melt index MI 2 (2.16 kg, 190° C.) in the range of 0.05-5 g/10 min.

5. A copolymer according to claim 1 having a sealing initiation temperature (SIT)<72° C.

6. A copolymer according to claim 1 having a molecular weight distribution (Mw/Mn) greater than 3.4 and less than 4.5.

7. A copolymer according to claim 1 wherein the alpha-olefin is 1-hexene.

8. A copolymer according to claim 1 prepared in the presence a metallocene catalyst system.

9. A copolymer according to claim 8 wherein the metallocene catalyst system comprises a monocyclopentadienyl metallocene complex.

10. A copolymer according to claim 1 exhibiting a powder compressability (C) as follows:
% C <(− A′×D )+ B′

wherein D is the density in kg/m 3 and A′=1 and B′=928.

11. A copolymer according to claim 1 exhibiting a powder compressability (C) as follows:
% C <(− A×D )+ B′

wherein D is the density in kg/m 3 and wherein A′=0.5 and B′=468.

12. A copolymer according to claim 1 having a Compositional Distribution Branch Index (CDBI) in the range 65-85%.

13. A copolymer according to claim 1 having a sealing initiation temperature (SIT)<65° C.

14. A copolymer according to claim 1 having a Crystallizable Species Fraction below 55° C. (CSF55)≥15%.

Assignees

• Ineos Europe Ag

Inventors

• Desportes Serge
• Ghouila Imen
• Lalanne-Magne Claudine
• Osmont Eric

Classifications

• C08F2500/06

  Comonomer distribution, e.g. normal, reverse or narrow · CPC title

• C08F4/65912

  in combination with an organoaluminium compound · CPC title

• C08F2500/08

  Low density, i.e. < 0.91 g/cm3 · CPC title

• C08F4/65908

  in combination with an ionising compound other than alumoxane, e.g. (C6F5)4B-X+ · CPC title

• C08F210/14

  Monomers containing five or more carbon atoms · CPC title