US4933393A
Expired / Lapsed
US
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Polyolefin composition
Assignee: Mitsui Chemicals Inc
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Filing: 1988-11-10
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Granted: 1990-06-12
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Expires: 2008-11-10
Abstract
Abstract An injection-molding polyolefin composition suitable for obtaining an injection-molded article having excellent sliding property and excellent impact resistance and being free from delamination, said polyolefin composition being characterized in that (1) the composition consists substantially of an ultrahigh-molecular-weight polyolefin having an intrinsic viscosity of 10-40 dl/g as measured in decalin of 135° C. and a low-molecular-weight to high-molecular-weight polyolefin having an intrinsic viscosity of 0.1-5 dl/g as measured in decalin of 135° C., (2) the ultrahigh-molecular-weight polyolefin is contained in the composition in an amount of 10-40% by weight based on the total weight of the ultrahigh-molecular-weight polyolefin and the low-molecular-weight to high-molecular-weight polyolefin, (3) the composition has an intrinsic viscosity [η]c of 3.5-15 dl/g as measured in decalin of 135° C., (4) the composition has a melt torque T of 4.5 kg.cm or below, and (5) the section of the injection-molded square plate produced from the composition has a phase-separated structure composed of a continuous phase and a discontinuous phase and the average paticle diameter (average major axis length) of the discontinuous phase is 20 μm or below.
Inventors
- 👤 Akinori Toyota
- 👤 Mamoru Kioka
- 👤 Takeshi Shiraki
- 👤 Kunie Hiroshige
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:17
CPC Classifications
C; C08; C08L; C08L23/00; C08F; C08F10/00; C08F10/02; C08L23/02; C08L23/04; C08L23/06; C08L2205/00; C08L2205/02; C08L2205/025; C08L2308/00; C08L2314/00; C08L2314/02; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
A polyolefin composition characterized in that (1) the composition consists substantially of an ultrahigh-molecular-weight polyolefin having an intrinsic viscosity of 10-40 dl/g as measured in decalin at 135° C. and a low-molecular-weight to high-molecular-weight polyolefin having an intrinsic viscosity of 0.1-5 dl/g as measured in decalin at 135° C. (2) the ultrahigh-molecular-weight polyolefin is contained in the composition in an amount of 10-40% by weight based on the total weight of the ultrahigh-molecular-weight polyolefin and the low-molecular-weight to high-molecular-weight polyolefin, (3) the composition has an intrinsic viscosity [η] of 3.5-15 dl/g as measured in decalin at 135 °C., (4) the composition has a melt torque T of 4.5 kg.cm or below, and (5) a section of an injection-molded square plate produced from the composition has a phase-separated structure composed of a continuous phase and a discontinuous phase and the average particle diameter, measured as average major axis length of the discontinuous phase is 20 μm or below.
Claim 2
Dependent Claim
157 words
A polyolefin composition characterized in that (1) the composition consists substantially of an ultrahigh-molecular-weight polyolefin having an intrinsic viscosity of 10-40 dl/g as measured in decalin at 135° C. and a low-molecular-weight to high-molecular-weight polyolefin having an intrinsic viscosity of 0.1-5 dl/g as measured in decalin at 135° C. (2) the ultrahigh-molecular-weight polyolefin is contained in the composition in an amount of 10-40% by weight based on the total weight of the ultrahigh-molecular-weight polyolefin and the low-molecular-weight to high-molecular-weight polyolefin, (3) the composition has an intrinsic viscosity [η] of 3.5-15 dl/g as measured in decalin at 135 °C., (4) the composition has a melt torque T of 4.5 kg.cm or below, and (5) a section of an injection-molded square plate produced from the composition has a phase-separated structure composed of a continuous phase and a discontinuous phase and the average particle diameter, measured as average major axis length of the discontinuous phase is 20 μm or below.
Claim 3
Dependent Claim
108 words
The polyolefin composition set forth in claim 1, wherein the ultrahigh-molecular-weight polyolefin and the low-molecular-weight to high-molecular-weight polyolefin are produced in a multi-step polymerization process wherein an olefin is polymerized in at least one polymerization step in the presence of a Ziegler-type catalyst formed by (A) a highly active titanium catalyst component containing magnesium, titanium and a halogen as essential elements and (B) an organoaluminum compound catalyst component to produce an ultrahigh-molecular-weight polyolefin having an intrinsic viscosity of 10-40 dl/g and, in another polymerization step, an olefin is polymerized in the presence of hydrogen to produce a low-molecular-weight to high-molecular-weight polyolefin having an intrinsic viscosity of 0.1-5 dl/g.
Claim 4
Dependent Claim
160 words
The olefin composition set forth in claim 1, wherein (1) the composition consists substantially of an ultrahigh-molecular-weight polyolefin having an intrinsic viscosity of 15-35 dl/g as measured in decalin at 135° C. and a low-molecular-weight to high-molecular-weight polyolefin having an intrinsic viscosity of 0.3-3 dl/g as measured in decalin at 135° C., (2) the ultrahigh-molecular-weight polyolefin is contained in the composition in an amount of 15-35% by weight based on the total weight of the ultrahigh-molecular-weight polyolefin and the low-molecular-weight to high-molecular-weight polyolefin, (3) the composition has an intrinsic viscosity [η] of 4.0-10 dl/g as measured in decalin of 135° C., (4) the composition has a melt torque T of 4.5 kg.cm or below, and (5) a section of an injection-molded square plate produced from the composition has a phase-separated structure composed of a continuous phase and a discontinuous phase and the average particle diameter, measured as average major axis length, of the discontinuous phase is 15 μm or below.
Claim 5
Dependent Claim
107 words
The polyolefin composition set forth in claim 3, wherein the ultrahigh-molecular-weight polyolefin and the low-molecular-weight to high-molecular-weight polyolefin are produced in a multi-step polymerization process wherein an olefin is polymerized in at least one polymerization step in the presence of a Ziegler-type catalyst formed by (A) a highly active titanium catalyst component containing magnesium, titanium and halogen as essential elements and (B) an organoaluminum compound catalyst component to produce an ultrahigh-molecular-weight polyolefin having an intrinsic viscosity of 15-35 dl/g and, in another polymerization step, an olefin is polymerized in the presence of hydrogen to produce a low-molecular-weight to high-molecular-weight polyolefin having an intrinsic viscosity of 0.5-3 dl/g.
Claim 6
Dependent Claim
160 words
The polyolefin composition set forth in claim 3, wherein (1) the composition consists substantially of an ultrahigh-molecular-weight polyethylene having an intrinsic viscosity of 15-35 dl/g as measured in decalin at 135° C. and a low-molecular-weight to high-molecular-weight polyethylene having an intrinsic viscosity of 0.5-3 dl/g as measured in decalin at 135° C., (2) The ultrahigh-molecular-weight polyethylene is contained in the composition in an amount of 15-35% by weight based on the total weight of the ultrahigh-molecular-weight polyethylene and the low-molecular-weight to high-molecular-weight polyethylene, (3) the composition has an intrinsic viscosity [η]c of 4.0-10 dl/g as measured in decalin of 135° C., (4) the composition has a melt torque T of 4.5 kg.cm or below, and (5) a section of an injection-molded square plate produced from the composition has a phase-separated structure composed of a continuous phase and a discontinuous phase and the average particle diameter, measured as average major axis length, of the discontinuous phase is 15 μm or below.
Claim 7
Dependent Claim
106 words
The polyolefin composition set forth in claim 5, wherein the ultrahigh-molecular-weight polyethylene and the low-molecular-weight to high-molecular-weight polyethylene are produced in a multi-step polymerization process wherein ethylene is polymerized in at least one polymerization step in the presence of a Ziegler-type catalyst formed by (A) a highly active titanium catalyst component containing magnesium, titanium and a halogen as essential elements and (B) an organoaluminum compound catalyst component to produce an ultrahigh-molecular-weight polyethylene having an intrinsic viscosity of 15-35 dl/g and, in another polymerization step, ethylene is polymerized in the presence of hydrogen to produce a low-molecular-weight to high-molecular-weight polyethylene having an intrinsic viscosity of 0.5-3 dl/g.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-11 | 1993-12-11 | 1994-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-11 | 1997-12-11 | 1998-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-11 | 2001-12-11 | 2002-06-12 | $7700.00 | Window Closed / Lapsed |