Patent US4487875A successfully refreshed from Google Patents.
US4487875A
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Ultra-high molecular weight polyethylene composition
Assignee: Asahi Kasei Corp
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Filing: 1984-02-17
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Granted: 1984-12-11
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Expires: 2004-02-17
Abstract
Abstract A composition improved in extrudability which comprises 100 parts by weight of an ultra-high molecular weight polyethylene having a viscometrically determined molecular weight of 1,000,000-6,000,000 and 10-50 parts by weight of modifier, said modifier comprising at least one member selected from the group consisting of (A) saturated aliphatic alcohols having 15-30 carbon atoms and (B) petroleum hydrocarbon cyclopentadiene type resins having a molecular weight of 500-2,000 and a softening point of 70°-130° C. and, as an optional component, (C) a low molecular weight polyethylene having a molecular weight of 1,000-20,000.
Inventors
- 👤 Nobuhiro Nakajima
- 👤 Jyoji Ibata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:35
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08J; C08J5/00; C08J5/18; C08K; C08K5/00; C08K5/04; C08K5/05; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; C08L2205/00; C08L2205/02; C08L2205/025; C08L2205/03; C08L2207/00; C08L2207/06; C08L2207/068; C08L57/00; C08L57/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
68 words
A composition improved in extrudability comprising 100 parts by weight of an ultra-high molecular weight polyethylene having a viscometrically determined molecular weight of 1,000,000-6,000,000 and 10-50 parts by weight of at least one modifier selected from the group consisting of: (A) saturated aliphatic alcohols having 15-30 carbon atoms, and (B) petroleum hydrocarbon cyclopentadiene type resins having a molecular weight of 500-2,000 and a softening point of 70°-130° C.
Claim 2
Dependent Claim
68 words
A composition improved in extrudability comprising 100 parts by weight of an ultra-high molecular weight polyethylene having a viscometrically determined molecular weight of 1,000,000-6,000,000 and 10-50 parts by weight of at least one modifier selected from the group consisting of: (A) saturated aliphatic alcohols having 15-30 carbon atoms, and (B) petroleum hydrocarbon cyclopentadiene type resins having a molecular weight of 500-2,000 and a softening point of 70°-130° C.
Claim 3
Dependent Claim
79 words
A composition improved in extrudability comprising 100 parts by weight of an ultra-high molecular weight polyehylene and 10-50 parts by weight of a mixture consisting of (C) and at least one member selected from the group consisting of (A) and (B): (A) saturated aliphatic alcohols having 15-30 carbon atoms, (B) petroleum hydrocarbon cyclopentadiene type resins having a molecular weight of 500-2,000 and a softening point of 70°-130° C., (C) low molecular weight polyethylene having a molecular weight of 1,000-20,000.
Claim 4
Dependent Claim
79 words
A composition improved in extrudability comprising 100 parts by weight of an ultra-high molecular weight polyehylene and 10-50 parts by weight of a mixture consisting of (C) and at least one member selected from the group consisting of (A) and (B): (A) saturated aliphatic alcohols having 15-30 carbon atoms, (B) petroleum hydrocarbon cyclopentadiene type resins having a molecular weight of 500-2,000 and a softening point of 70°-130° C., (C) low molecular weight polyethylene having a molecular weight of 1,000-20,000.
Claim 5
Dependent Claim
20 words
A composition according to claim 1 or 2, wherein said ultra-high molecular weight polyethylene has a molecular weight of 1,500,000-3,000,000.
Claim 6
Dependent Claim
17 words
A composition according to claim 1 or 2, wherein said saturated aliphatic alcohol has 16-20 carbon atoms.
Claim 7
Dependent Claim
29 words
A composition according to claim 4, wherein said saturated aliphatic alcohol is stearyl alcohol or coconut alcohol, said coconut alcohol being a mixture of alcohols having 16-18 carbon atoms.
Claim 8
Dependent Claim
19 words
A composition according to claim 1 or 2, wherein said petroleum hydrocarbon cyclopentadiene type resin is a hydrogenated resin.
Claim 9
Dependent Claim
26 words
A composition according to claim 6, wherein said hydrogenated resin has an average molecular weight of about 1,000 and a softening point of about 90° C.
Claim 10
Dependent Claim
18 words
A composition according to claim 2, wherein said low molecular weight polyethylene has a molecular weight of 5,000-20,000.
Claim 11
Dependent Claim
18 words
A composition according to claim 8, wherein the molecular weight of said low molecular weight polyethylene is 5,000-12,000.
Claim 12
Dependent Claim
30 words
A composition according to claim 1 or 2, wherein the total amount of modifiers is 15-35 parts by weight per 100 parts by weight of said ultra-high molecular weight polyethylene.
Claim 13
Dependent Claim
54 words
A composition according to claim 1 or 2, wherein said modifier is a mixture of two or more modifiers and the ratio, by weight, of the amount of the modifier used in the smallest amount to the amount of the modifier used in the largest amount is in the range of 1:1 to 1:10.
Claim 14
Dependent Claim
19 words
A composition according to claim 11, wherein said ratio, by weight, is in the range of 1:1 to 1:6.
Claim 15
Dependent Claim
53 words
A composition according to claim 2 which comprises 100 parts by weight of ultra-high molecular weight polyethylene, 5-15 parts by weight of component (A), 5-15 parts by weight of component (B) and 5-15 parts by weight of component (C), wherein the sum of components (A), (B) and (C) is 15-35 parts by weight.
Claim 16
Dependent Claim
69 words
A composition according to claim 13, wherein said ultra-high molecular weight polyethylene has a molecular weight of 1,500,000-3,000,000, said component (A) is stearyl alcohol, said component (B) is a hydrogenated petroleum hydrocarbon cyclopentadiene type resin having an average molecular weight of about 1,000 and a softening point of about 90° C. and said component (C) is a low molecular weight polyethylene having an average molecular weight of about 9,000.
Claim 17
Dependent Claim
87 words
In the extrusion molding of ultra-high molecular weight polyethylene having a viscometrically determined molecular weight of 1,000,000-6,000,000 wherein an extrusion aid is mixed with the polyethylene and the mixture is extruded, the improvement which comprises employing as the extrusion aid per 100 parts by weight of polyethylene at least 10-50 parts of at least one modifier selected from the (A) saturated aliphatic alcohols having 15-30 carbon atoms, and (B) petroleum hydrocarbon cyclopentadiene type resins having a molecular weight of 500-2,000 and a softening point of 70°-130° C.
Claim 18
Dependent Claim
87 words
In the extrusion molding of ultra-high molecular weight polyethylene having a viscometrically determined molecular weight of 1,000,000-6,000,000 wherein an extrusion aid is mixed with the polyethylene and the mixture is extruded, the improvement which comprises employing as the extrusion aid per 100 parts by weight of polyethylene at least 10-50 parts of at least one modifier selected from the (A) saturated aliphatic alcohols having 15-30 carbon atoms, and (B) petroleum hydrocarbon cyclopentadiene type resins having a molecular weight of 500-2,000 and a softening point of 70°-130° C.
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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) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |