US5102955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad distribution, high molecular weight low density polyethylene and method of making thereof
Assignee: Mobil Oil AS
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Filing: 1989-12-29
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Granted: 1992-04-07
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Expires: 2009-12-29
Abstract
Abstract There is disclosed a low density polymer having a broad molecular weight distribution, such that its melt flow ratio (MFR) is about 50 to about 250, and a substantially constant melt index-corrected density. The polymer, produced e.g., by blending a first polymer component of high molecular weight with a second polymer component of low molecular weight, with both polymer components having substantially the same melt index-corrected density, produces films having improved strength properties and low hexane extractables, as compared to films made from comparable individual polymer components. There is also disclosed a low density polymer, also having MFR of about 50 to about 250, having substantially no polymer chains having low molecular weight and short chain branches, which is prepared by blending a first polymer component of low density and high molecular weight with a second polymer component of relatively high density and relatively low molecular weight. The melt index-corrected densities of these two polymer components are dissimilar.
Inventors
- 👤 David C. Calabro
- 👤 Pamela J. Cook
- 👤 Bohumil V. Kral
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:51
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/06; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L2205/00; C08L2205/02; C08L23/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
123 words
A low density ethylene polymer blend having a broad molecular weight distribution, such that its melt flow ratio (MFR) is about 50 to about 250, and a measured density of about 0.910 to about 0.940 g/cc, said blend comprising a linear low density polyethylene first component of high molecular weight (HMW) having a high load melt index (I 21 ) of about 0.1 to about 3.0 g/10 min. and a measured density of about 0.880 to 0.920 g/cc, and a high density polyethylene second component of low molecular weight (LMW) having a melt index (I 2 ) of about 100 to about 1,000 g/10 min. and a measured density of about 0.950 to about 0.970 g/cc, said components having dissimilar melt-index corrected densities.
Claim 2
Dependent Claim
123 words
A low density ethylene polymer blend having a broad molecular weight distribution, such that its melt flow ratio (MFR) is about 50 to about 250, and a measured density of about 0.910 to about 0.940 g/cc, said blend comprising a linear low density polyethylene first component of high molecular weight (HMW) having a high load melt index (I 21 ) of about 0.1 to about 3.0 g/10 min. and a measured density of about 0.880 to 0.920 g/cc, and a high density polyethylene second component of low molecular weight (LMW) having a melt index (I 2 ) of about 100 to about 1,000 g/10 min. and a measured density of about 0.950 to about 0.970 g/cc, said components having dissimilar melt-index corrected densities.
Claim 3
Dependent Claim
78 words
The polymer blend of claim 1 having a MFR of about 70 to about 200 and a measured density of about 0.915 to about 0.940 g/cc, and wherein said first component has a high load melt index (I 21 ) of about 0.1 to about 1.0 g/10 min. and a measured density of about 0.890 to about 0.920 g/cc, and said second component has a melt index (I 2 ) of about 100 to about 700 g/10 min.
Claim 4
Dependent Claim
89 words
The polymer blend of claim 2 having a MFR of about 80 to about 160 and a measured density of about 0.920 to about 0.940 g/cc, and wherein said first component has a high load melt index (I 21 ) of about 0.2 to about 1.0 g/10 min. and a measured density of about 0.900 to about 0.915 g/cc, and said second component has a melt index (I 2 ) of about 200 to about 500 g/10 min. and a measured density of about 0.960 to about 0.970 g/cc.
Claim 5
Dependent Claim
21 words
The polymer blend of claim 3 which contains substantially no polymer chains having both, low molecular weight and short chain branches.
Claim 6
Dependent Claim
28 words
The polymer blend of claim 4 which contains substantially no polymer chains having both a weight-average molecular weight of about 1,000 to about 10,000 and short chain branches.
Claim 7
Dependent Claim
23 words
The polymer blend of claim 1 having a high load melt index (I 21 ) of about 3.0 to about 25.0 g/10 min.
Claim 8
Dependent Claim
23 words
The polymer blend of claim 6 having a high load melt index (I 21 ) of about 5.0 to about 15.0 g/10 min.
Claim 9
Dependent Claim
23 words
The polymer blend of claim 7 having a high load melt index (I 21 ) of about 6.0 to about 10.0 g/10 min.
Claim 10
Dependent Claim
21 words
A method of producing the polymer blend of claim 1 comprising blending said first polymer component with said second polymer component.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-07 | 1995-10-07 | 1996-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-07 | 1999-10-07 | 2000-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-07 | 2003-10-07 | 2004-04-07 | $7700.00 | Window Closed / Lapsed |