Patent US5266392A successfully refreshed from Google Patents.
US5266392A
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US
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Plastomer compatibilized polyethylene/polypropylene blends
Assignee: ExxonMobil Chemical Patents Inc
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Filing: 1992-11-16
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Granted: 1993-11-30
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Expires: 2012-11-16
Abstract
Abstract Compatibilized blends of polypropylene, linear low density polyethylene and a low molecular weight plastomer are disclosed. The blend preferably contains at least about 50 percent by weight of crystalline polypropylene, from about 10 to about 50 percent by weight of LLDPE dispersed in a matrix of the polypropylene, and a compatibilizing amount of an ethylene/alpha-olefin plastomer having a weight average molecular weight between about 5,000 to about 50,000, a density of less than about 0.90 g/cm 3 , and a melt index of at least about 50 dg/min. The blend is useful in the formation of melt spun and melt blown fibers. Also disclosed are spun bonded-melt blown-spun bonded fabrics made from the blends.
Inventors
- 👤 Louis P. Land
- 👤 Angelo A. Montagna
- 👤 Kenneth W. Bartz
- 👤 Aspy K. Mehta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:26
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/44; D01F6/46; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/56; Y; Y10; Y10S; Y10S525/00; Y10S525/931; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T442/00; Y10T442/60; Y10T442/68; Y10T442/681
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
99 words
A polyethylene/polypropylene blend, comprising: at least 50 percent by weight of crystalline polypropylene; at least about 10 percent by weight of linear low density polyethylene having a density of about 0.915 to about 0.94 dispersed in a matrix of said polypropylene; and a compatibilizing amount of an ethylene/alpha-olefin plastomer having an alpha-olefin content of from about 5 to about 25 mole percent, a melt index of above about 50 dg/min, a weight average molecular weight between about 5000 and about 50,000, a density of from about 0.88 about 0.90 g/cm 3 and an X-ray crystallinity of at least 10%.
Claim 2
Dependent Claim
99 words
A polyethylene/polypropylene blend, comprising: at least 50 percent by weight of crystalline polypropylene; at least about 10 percent by weight of linear low density polyethylene having a density of about 0.915 to about 0.94 dispersed in a matrix of said polypropylene; and a compatibilizing amount of an ethylene/alpha-olefin plastomer having an alpha-olefin content of from about 5 to about 25 mole percent, a melt index of above about 50 dg/min, a weight average molecular weight between about 5000 and about 50,000, a density of from about 0.88 about 0.90 g/cm 3 and an X-ray crystallinity of at least 10%.
Claim 3
Dependent Claim
10 words
The blend of claim 1, wherein said polypropylene is isotactic.
Claim 4
Dependent Claim
17 words
The blend of claim 1, wherein said polypropylene has a melt flow rate greater than 20 dg/min.
Claim 5
Dependent Claim
21 words
The blend of claim 1, wherein said polypropylene has a melt flow rate of from about 400 to about 1000 dg/min.
Claim 6
Dependent Claim
17 words
The blend of claim 1, wherein said polypropylene has M w /M n less than about 4.
Claim 7
Dependent Claim
38 words
The blend of claim 1, wherein said linear low density polyethylene comprises a copolymer of ethylene and at least one C 4 -C 12 alpha-olefin and has a density from about 0.915 to about 0.94 g/cm 3 .
Claim 8
Dependent Claim
21 words
The blend of claim 1, wherein said plastomer comprises from about 2 to about 15 percent by weight of said blend.
Claim 9
Dependent Claim
10 words
A fiber melt spun from the blend of claim 1.
Claim 10
Dependent Claim
20 words
The fiber of claim 8, wherein said polypropylene has a melt flow rate from about 20 to about 50 dg/min.
Claim 11
Dependent Claim
10 words
A fiber melt blown from the blend of claim 1.
Claim 12
Dependent Claim
20 words
The fiber of claim 10, wherein said polypropylene has a melt flow rate from about 400 to about 1000 dg/min.
Claim 13
Dependent Claim
14 words
A nonwoven fabric, comprising fiber melt spun from the polyethylene/polypropylene blend of claim 1.
Claim 14
Dependent Claim
18 words
The nonwoven fabric of claim 12, wherein said polypropylene has a melt flow rate greater than 20 dg/min.
Claim 15
Dependent Claim
14 words
A nonwoven fabric comprising fiber melt blown from the polyethylene/polypropylene blend of claim 1.
Claim 16
Dependent Claim
21 words
The nonwoven fabric of claim 14, wherein said polypropylene has a melt flow rate from about 400 to about 1000 dg/min.
Claim 17
Dependent Claim
17 words
The blend of claim 1, wherein the plastomer is an ethylene/C 3 -C 20 alpha olefin copolymer.
Claim 18
Dependent Claim
18 words
The copolymer of claim 1, wherein the alpha-olefin is present from about 7 to about 22 mole percent.
Claim 19
Dependent Claim
17 words
The of claim 1, wherein the alpha-olefin is present from about 9 to about 18 mole percent.
Claim 20
Dependent Claim
18 words
The blend of claim 1, wherein the plastomer is present from about 5 to about 12 weight percent.
Claim 21
Dependent Claim
18 words
The blend of claim 1, wherein the polypropylene is present from about 50 to about 85 weight percent.
Claim 22
Dependent Claim
18 words
The blend of claim 1, wherein the polypropylene is present from about 55 to about 80 weight percent.
Claim 23
Dependent Claim
18 words
The blend of claim 1, wherein the polypropylene is present from about 60 to about 75 weight percent.
Claim 24
Dependent Claim
18 words
The blend of claim 1, wherein the LLDPE is present from about 10 to about 50 weight percent.
Claim 25
Dependent Claim
18 words
The blend of claim 1, wherein the LLDPE is present from about 15 to about 40 weight percent.
Claim 26
Dependent Claim
18 words
The blend of claim 1, wherein the LLDPE is present from about 20 to about 30 weight percent.
Claim 27
Dependent Claim
18 words
The blend of claim 1, wherein the plastomer has a weight average molecular weight of 20,000 to 30,000.
Claim 28
Dependent Claim
16 words
The blend of claim 1, wherein the plastomer has an X-ray crystallinity of 15 to 25%.
Claim 29
Dependent Claim
16 words
The blend of claim 1, wherein the plastomer has an X-ray crystallinity of 10 to 25%.
Claim 30
Dependent Claim
16 words
The blend of claim 1, wherein the plastomer has an X-ray crystallinity of 20 to 25%.
Claim 31
Dependent Claim
16 words
The blend of claim 1, wherein the plastomer has a density of 0.89 dg/min or greater.
Claim 32
Dependent Claim
9 words
An article made from the blend of claim 1.
Claim 33
Dependent Claim
101 words
The blend of claim 1, wherein the polypropylene is present from about 60 to about 75 weight percent, the linear low density polyethylene is present at from about 20 to about 30 weight percent, the plastomer is present at about 5 to 12 weight percent and is a copolmer of ethylene and about 5 to about 25 mole % of a C 3 to C 6 alpha olefin, having a weight average molecular weight of 20,000 to about 50,000, a density of 0.89 to 0.90, an MI of 50 to about 200 dg/min and an X-ray crystallinity of at least 10%.
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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) | 1996-11-29 | 1997-05-31 | 1997-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-29 | 2001-05-31 | 2001-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-29 | 2005-05-31 | 2005-11-30 | $7700.00 | Window Closed / Lapsed |