IP Library › Granted Patent US 7,078,081
Granted Patent B2
US 7,078,081 · App. 11/117,123 · Granted Jul 18, 2006

Preparation of polyethylene films

Assignee: Equistar Chemicals, LP
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Quick Facts
Patent No.
US 7,078,081
App. No.
11/117,123
Granted
Jul 18, 2006
Kind
B2
Abstract

An essentially transparent, high density polyethylene film is disclosed. The film has a haze of 20% or less, a gloss of 40% or greater, and density within the range of 0.935 to 0.948 g/cc. The film is made by a high-stalk blown extrusion process and then uniaxially oriented in the machine direction.

Claims (11)

1. A method comprising:

(a) converting a polyethylene resin into a film by a high-stalk blown extrusion process, wherein the polyethylene resin has a density within the range of 0.935 to 0.948 g/cc and an MI 2 within the range of 0.08 to 0.15 dg/min; and

(b) orienting the film of step (a) uniaxially in the machine direction; wherein the oriented film has a haze of 20% or less.

2. The method of claim 1 wherein the polyethylene resin has a density within the range of 0.939 to 0.945 g/cc.

3. The method of claim 1 wherein the polyethylene resin has a density within the range of 0.939 to 0.941 g/cc.

4. The method of claim 1 wherein the polyethylene resin has an MI 2 is within the range of 0.10 to 0.15 dg/min.

5. The method of claim 1 wherein the oriented film has a haze of 15% or less.

6. The method of claim 1 wherein the film is uniaxially oriented in the machine direction with a draw-down ratio of 5:1 or greater.

7. The method of claim 6 wherein the draw-down ratio is 6:1 or greater.

8. The method of claim 2 wherein the oriented film has a gloss of 40% or greater.

9. The method of claim 8 wherein the oriented film has a gloss of 50% or greater.

Assignments (17)
RELEASE OF SECURITY INTEREST Recorded Jan 22, 2014
From: WELLS FARGO BANK, NATIONAL ASSOCIATION
To: EQUISTAR CHEMICALS, LP
Reel/Frame 032112/0786 →
RELEASE OF SECURITY INTEREST Recorded Jan 22, 2014
From: DEUTSCHE BANK TRUST COMPANY AMERICAS
To: EQUISTAR CHEMICALS, LP
Reel/Frame 032113/0684 →
RELEASE OF SECURITY INTEREST Recorded Jan 22, 2014
From: BANK OF AMERICA, N.A.
To: EQUISTAR CHEMICALS, LP
Reel/Frame 032113/0730 →
APPOINTMENT OF SUCCESSOR ADMINISTRATIVE AGENT Recorded Jan 22, 2014
From: UBS AG, STAMFORD BRANCH
To: BANK OF AMERICA, N.A.
Reel/Frame 032112/0863 →
RELEASE OF SECURITY INTEREST Recorded Jan 22, 2014
From: CITIBANK, N.A.
To: EQUISTAR CHEMICALS, LP
Reel/Frame 032113/0644 →
SECURITY AGREEMENT Recorded May 19, 2010
From: EQUISTAR CHEMICALS, LP
To: WELLS FARGO BANK, NATIONAL ASSOCIATION, AS COLLATERAL AGENT
Reel/Frame 024402/0655 →
SECURITY AGREEMENT Recorded May 18, 2010
From: EQUISTAR CHEMICALS, LP
To: CITIBANK, N.A., AS ADMINISTRATIVE AGENT
Reel/Frame 024397/0861 →
SECURITY AGREEMENT Recorded May 7, 2010
From: EQUISTAR CHEMICALS. LP
To: UBS AG, STAMFORD BRANCH, AS COLLATERAL AGENT
Reel/Frame 024351/0001 →
SECURITY AGREEMENT Recorded May 6, 2010
From: EQUISTAR CHEMICALS, LP
To: DEUTSCHE BANK TRUST COMPANY AMERICAS, AS COLLATERAL AGENT
Reel/Frame 024342/0443 →
RELEASE OF SECURITY INTEREST Recorded May 5, 2010
From: CITIBANK, N.A., AS COLLATERAL AGENT
To: LYONDELL CHEMICAL TECHNOLOGY, L.P.; EQUISTAR CHEMICALS, LP
Reel/Frame 024337/0856 →
RELEASE OF SECURITY INTEREST Recorded May 5, 2010
From: UBS AG, STAMFORD BRANCH, AS COLLATERAL AGENT
To: EQUISTAR CHEMICALS, LP
Reel/Frame 024337/0186 →
RELEASE OF SECURITY INTEREST Recorded May 5, 2010
From: CITIBANK, N.A., AS COLLATERAL AGENT
To: LYONDELL CHEMICAL TECHNOLOGY, L.P.; EQUISTAR CHEMICALS, LP
Reel/Frame 024337/0705 →
RELEASE OF SECURITY INTEREST Recorded May 4, 2010
From: CITIBANK, N.A., AS COLLATERAL AGENT
To: EQUISTAR CHEMICALS, LP
Reel/Frame 024329/0535 →
SECURITY AGREEMENT Recorded Oct 30, 2009
From: EQUISTAR CHEMICALS, LP
To: UBS AG, STAMFORD BRANCH, AS COLLATERAL AGENT
Reel/Frame 023449/0687 →
SECURITY AGREEMENT Recorded Apr 9, 2009
From: EQUISTAR CHEMICALS, LP
To: CITIBANK, N.A., AS ADMINISTRATIVE AGENT AND COLLATERAL AGENT
Reel/Frame 022678/0860 →
SECURITY AGREEMENT Recorded Aug 4, 2008
From: BASELL POLYOLEFINE GMBH; ARCO CHEMICAL TECHNOLOGY L.P.; ARCO CHEMICAL TECHNOLOGY, INC.; ATLANTIC RICHFIELD COMPANY; BASELL NORTH AMERICA, INC.; BASELL POLYOLEFIN GMBH; LYONDELL CHEMICAL COMPANY; EQUISTAR CHEMICALS, L.P.
To: CITIBANK, N.A., AS COLLATERAL AGENT
Reel/Frame 021354/0708 →
GRANT OF SECURITY INTEREST IN UNITED STATES PATENTS AND PATENT APPLICATIONS Recorded Mar 26, 2008
From: BASELL POLYOLEFINE GMBH; ARCO CHEMICAL TECHNOLOGY L.P.; ARCO CHEMICAL TECHNOLOGY, INC.; ATLANTIC RICHFIELD COMPANY; BASELL NORTH AMERICA, INC.; EQUISTAR CHEMICALS. LP.; LYONDELL CHEMICAL COMPANY; LYONDELL CHEMICAL TECHNOLOGY, L.P.; LYONDELL PETROCHEMICAL COMPANY; NATIONAL DISTILLERS AND CHEMICAL CORPORATION; OCCIDENTAL CHEMICAL CORPORATION; OLIN CORPORATION; QUANTUM CHEMICAL CORPORATION; BASELL POLYOLEFIN GMBH
To: CITIBANK, N.A., AS COLLATERAL AGENT
Reel/Frame 020704/0562 →
Continuity (2)
Division 1076794000 · Jan 29, 2004
Related Publication 20050197459A1 · Sep 8, 2005