Patent US4714030A successfully refreshed from Google Patents.
US4972035A
Expired / Lapsed
US
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Process for preparing ultra-high-molecular-weight polyolefin fine powder
Assignee: Mitsui Chemicals Inc
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Filing: 1989-02-24
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Granted: 1990-11-20
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Expires: 2009-02-24
Abstract
Abstract Ultra-high-molecular-weight polyolefin fine powder characterized in that said fine powder has an intrinsic viscosity measured in decalin at 135 DEG C. of at least 10 dl/g and an average particle diameter in the range of 1-80 mu m, at least 20 weight % of the powder passing through 350 Tyler mesh screen.
Inventors
- 👤 Michiharu Suga
- 👤 Mamoru Kioka
- 👤 Toshio Kobayashi
- 👤 Akifumi Kato
- 👤 Michio Endo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 02:46
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08F; C08F110/00; C08F110/02; C08F2410/00; C08F2410/06; C08J2323/00; C08J2323/02; C08L; C08L2207/00; C08L2207/06; C08L2207/068; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L2314/00; C08L2314/02; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52; Y10; Y10S; Y10S526/00; Y10S526/906; Y10S526/907; Y10S526/908; Y10S526/909
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
A process for preparing an ultra-high-molecular-weight polyolefin fine powder which comprises polymerizing at least one olefin monomer using a Ziegler catalyst which has been subjected to high-speed shearing treatment to obtain an average particle diameter of from 0.01 to 5 μm, said catalyst comprising a highly active, particulate titanium catalytic component and an organic aluminum catalytic component, in a hydrocarbon medium at a temperature between 20° C. and 100° C. to form a slurry of a fine powder of ultra-high-molecular-weight polyolefin which is composed of generally spherular particles, and which has an intrinsic viscosity measured in decalin at 135° C. of at least 10 dl/g and an average particle diameter in the range of 1-80 μm, at least 20 weight % of the powder passing through 350 Tyler mesh screen.
Claim 2
Dependent Claim
130 words
A process for preparing an ultra-high-molecular-weight polyolefin fine powder which comprises polymerizing at least one olefin monomer using a Ziegler catalyst which has been subjected to high-speed shearing treatment to obtain an average particle diameter of from 0.01 to 5 μm, said catalyst comprising a highly active, particulate titanium catalytic component and an organic aluminum catalytic component, in a hydrocarbon medium at a temperature between 20° C. and 100° C. to form a slurry of a fine powder of ultra-high-molecular-weight polyolefin which is composed of generally spherular particles, and which has an intrinsic viscosity measured in decalin at 135° C. of at least 10 dl/g and an average particle diameter in the range of 1-80 μm, at least 20 weight % of the powder passing through 350 Tyler mesh screen.
Claim 3
Dependent Claim
94 words
The process according to claim 1 wherein the highly active, particulate titanium catalytic component has been prepared by a method which comprises mixing a hydrocarbon solution in which magnesium chloride and a higher alcohol of from 6 to 20 carbon atoms are dissolved with titanium chloride at a temperature of no more than about 50° C., and agitating vigorously the resulting mixture in the presence of a monocarboxylate at a temperature between about 50° C. and about 100° C. to deposit a particulate product and subjecting the particulate product to high speed shearing treatment.
Claim 4
Dependent Claim
46 words
The process according to claim 1 wherein the highly active, particulate titanium catalytic component contains about 1 to about 6% by weight of titanium, a halogen-to-titanium atomic ratio ranging from about 5 to about 90 and a magnesium-to-titanium atomic ratio of about 4 to about 50.
Claim 5
Dependent Claim
25 words
The process according to claim 1 wherein the organic aluminum catalytic component is selected from the group consisting of trialkyl-aluminum, dialkyl-aluminum halide and alkyl-aluminum sesquichloride.
Claim 6
Dependent Claim
11 words
The process according to claim 1 wherein the polyolefin is polyethylene.
Claim 7
Dependent Claim
16 words
The process according to claim 1 wherein the Ziegler catalyst further comprises an electron donating compound.
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) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |