EP0314151A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Polyethylene fibers
Assignee: Dow Chemical Co
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Filing: 1988-10-27
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Granted: —
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Expires: 2008-10-27
Abstract
Abstract Blends of high molecular weight linear polyethylene and low molecular weight linear polyethylene provide improved fiber-forming capabilities over that found with either polymer taken alone. Preferably at least one of the polymers used in the blend is a linear low density polyethylene, LLDPE, which is a linear polyethylene comprising ethylene copolymerized with an amount of a higher alpha-olefin which causes the density of the copolymer to be less than that of a homopoly-mer made using the same process and catalyst. The higher alpha-olefin can be at least one in the C 3 -C 12 range, preferably in the C 4 -C 8 range.
Inventors
- 👤 Stephen P. Krupp
- 👤 John O. Bieser
- 👤 Edward N. Knickerbocker
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 06:34
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; B; B01; B01F; B01F33/00; B01F33/30; C08L23/08; C08L23/0807; C08L23/0815; D; D01; D01F; D01F6/00; D01F6/02; D01F6/04; D01F6/44; D01F6/46; D04; D04H; D04H3/00; D04H3/08; D04H3/16; C08L2205/00; C08L2205/02; C08L2205/025; Y; Y10; Y10S; Y10S264/00; Y10S264/26; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T442/00; Y10T442/60; Y10T442/681
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
94 words
A blend of linear polyethylenes suitable for spunbonding at throughput rates of 1.0 to 1.2 grams / minute/hole, at linear spinning velocities of at least 3500 meters per minute, to produce fiber sizes of less than 3.0 denierifilament, comprising high molecular weight linear polyethylenes having a MFR value within the range between 0.5 to 25 g/10 min. and a density above 0.91 g/cm 3 , and low molecular weight linear polyethylene having a MFR value within the range between 25 to 300 g/10 min. and a density above 0.91 g / cm 3 .
Claim 2
Dependent Claim
94 words
A blend of linear polyethylenes suitable for spunbonding at throughput rates of 1.0 to 1.2 grams / minute/hole, at linear spinning velocities of at least 3500 meters per minute, to produce fiber sizes of less than 3.0 denierifilament, comprising high molecular weight linear polyethylenes having a MFR value within the range between 0.5 to 25 g/10 min. and a density above 0.91 g/cm 3 , and low molecular weight linear polyethylene having a MFR value within the range between 25 to 300 g/10 min. and a density above 0.91 g / cm 3 .
Claim 3
Dependent Claim
52 words
Blend of Claim 1 wherein the ratio of the high molecular weight linear polyethylene and low molecular weight linear polyethylene is sufficient to provide a blend having a MFR value in the range of 25 to 100 g/1 0 min. and a density of 0.91 to 0.96 g / cm 3 .
Claim 4
Dependent Claim
72 words
Blend of Claim 2 wherein the high molecular weight linear polyethylene is LLDPE having a MFR value within the range between 0.5 and 25 g/10 min. and a density in the range of 0.91 to 0.96 g/cm 3 , the low molecular weight linear polyethylene is LLDPE having a MFR value within the range between 25 and 300 g/10 min. and a density in the range of 0.91 to 0.96 gicm 3
Claim 5
Dependent Claim
29 words
Blend of any one of Claims 1 to 3 wherein each of the linear polyethylenes comprises a copolymer of ethylene with at least one C 3 -C 12 olefin.
Claim 6
Dependent Claim
24 words
Blend of Claim 4 wherein each of the linear polyethylenes comprises a copolymer of ethylene with at least one C 4 -C 8 olefin.
Claim 7
Dependent Claim
19 words
Blend of Claim 5 wherein at least one of the linear polyethylenes is a copolymer of ethylene and octene.
Claim 8
Dependent Claim
20 words
Blend of Claim 5 wherein at least one of the linear polyethylenes is a copolymer of ethylene, butene and octene.
Claim 9
Dependent Claim
20 words
Blend of Claim 5 wherein at least one of the linear polyethylenes is a copolymer of ethylene, hexene and octene.
Claim 10
Dependent Claim
19 words
Blend of Claim 5 wherein at least one of the linear polyethylenes is a copolymer of ethylene and butene.
Claim 11
Dependent Claim
28 words
A process wherein molten LLDPE polymer is spunbonded to make a web or fabric, wherein the LLDPE comprises the blend of any one of Claims 1 to 9.
References Cited (Backward Citations)
No citation records indexed.
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