Systems, methods and compositions for production of tie-layer adhesives

Patent metadata

Field	Value
Publication number	US-9676971-B2
Application number	US-201615093399-A
Country	US
Kind code	B2
Filing date	Apr 7, 2016
Priority date	Sep 30, 2011
Publication date	Jun 13, 2017
Grant date	Jun 13, 2017

Abstract

A tie layer adhesive composition for multilayer structures, wherein the tie layer is composed of a graft polyolefin and a hybrid polyolefin.

First claim

What is claimed is:

1. An adhesive composition comprising
(A) 5-10% by weight of a grafted high-density polyethylene comprising 0.05-2% by weight of maleic anhydride, having
(i) a density from 0.93 to 0.957 g/cm 3 ,
(ii) a high load melt index of 1 to 10 g/10 min, and
(iii) a melt index from 0.5 to 3 g/10 min; and

(B) 90-95% by weight of a linear low density polyethylene comprising:
(i) a density from 0.91 to 0.936 g/cm 3 , and
(ii) a Mw/Mn from 5 to 8.9,

wherein the linear low density polyethylene is produced by polymerizing ethylene in the presence of a hybrid catalyst comprising a mixture of at least two single-site catalysts.

2. The adhesive composition of claim 1 , wherein the graft polyolefin is high-density polyethylene (HDPE) grafted with maleic anhydride.

3. The adhesive composition of claim 1 , wherein the hybrid polyolefin is polyethylene.

4. The adhesive composition of claim 3 , wherein the polyethylene has a density of 0.91-0.955 g/cm 3 .

5. The adhesive composition of claim 1 , wherein the hybrid catalyst comprises a hafnocene catalyst component and an iron catalyst component.

6. The adhesive composition of claim 5 , wherein the hafnocene catalyst component is bis(n-butylcyclopentadienyl)hafnium dichloride.

7. The adhesive composition of claim 5 , wherein the iron catalyst component is 2,6-Bis[1-(4,6-Dimethyl-2-chloro-phenylimino)ethyl]pyridine iron (II) dichloride.

8. The adhesive composition of claim 1 , comprising 85-95% by weight hybrid polyolefin and 5-15% by weight graft polyolefin.

9. The adhesive composition of claim 7 , wherein the molecular weight distribution of the hybrid polyolefin is greater than or equal to 5.

10. A process for preparing the adhesive composition of claim 1 , comprising combining graft polyolefin with a hybrid polyolefin produced with the use of a hybrid catalyst comprising a mixture of at least two single-site catalysts.

11. The process of claim 10 , wherein the graft polyolefin is high-density polyethylene (HDPE) grafted with maleic anhydride.

12. The process of claim 10 , wherein the hybrid catalyst comprises a hafnocene catalyst component and an iron catalyst component.

13. The process of claim 12 , wherein the hafnocene catalyst component is bis(n-butylcyclopentadienyl)hafnium dichloride.

14. The process of claim 12 , wherein the iron catalyst component is 2,6-Bis[1-(4,6-Dimethyl-2-chloro-phenylimino) ethyl]pyridine iron (II) dichloride.

15. The process of claim 10 , wherein the tie layer composition comprises 85-95% by weight hybrid polyolefin and 5-15% by weight graft polyolefin.

16. The process of claim 10 , wherein the molecular weight distribution of the hybrid polyolefin is greater than or equal to 5.

17. A tie-layer for a multilayer structure, wherein the tie-layer comprises the composition of claim 1 .

Assignees

• Equistar Chem Lp

Inventors

• Botros Maged G
• Haley Jeffery C

Classifications

• C09J151/06 Primary

  grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond · CPC title

• C08F4/61904

  in combination with another component of C08F4/60 · CPC title

• C08F2500/12

  Melt flow index or melt flow ratio · CPC title

• C09J123/08

  Copolymers of ethene (C09J123/16 takes precedence) · CPC title

• C08F222/06

  Maleic anhydride · CPC title