US4945126A
Expired / Lapsed
US
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Methods of improving friction and wear properties of polymer systems
Assignee: Zeneca Inc
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Filing: 1987-02-02
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Granted: 1990-07-31
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Expires: 2007-02-02
Abstract
Abstract Lubricant systems are provided in which a polyolefin or polyolefin/polytetrafluoroethylene blend functions as a lubricant in a polymer matrix material. The resulting polymer composites containing about 1 to 30 weight percent of the novel lubricant or lubricant blend have greatly improved friction and wear properties, including lower coefficients of friction and increased surface wear resistence. The polyolefin does not remain as discrete, identifiable particles after mixing with the polymer matrix, and has an average molecular weight of less than 500,000.
Inventors
- 👤 Jane M. Crosby
- 👤 John E. Theberge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
C; C08; C08L; C08L59/00; C08L101/00; C08L23/00; C08L23/02; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L81/00; C08L81/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
136 words
In a method of making a plastic-plastic or plastic-metal wear system wherein the surface of a polymer composite bears against another surface causing friction and wear of the polymer composite, the improvement comprising improving the wear resistance and lowering the coefficients of friction of said composite by melt mixing of a polymer matrix and about 1 to 30 weight percent, based on the total composite, of a lubricant comprising a blend of about 2 to 98 weight percent polyolefin having a weight average molecular weight of about 50,000 to about 500,000 and about 98 to 2 weight percent finely divided polytetrafluoroethylene, to form said composite in which said polyolefin does not remain as discrete, identifiable particles after melt mixing with said polymer matrix, and said matrix is not the same as the polyolefin in the lubricant.
Claim 2
Dependent Claim
136 words
In a method of making a plastic-plastic or plastic-metal wear system wherein the surface of a polymer composite bears against another surface causing friction and wear of the polymer composite, the improvement comprising improving the wear resistance and lowering the coefficients of friction of said composite by melt mixing of a polymer matrix and about 1 to 30 weight percent, based on the total composite, of a lubricant comprising a blend of about 2 to 98 weight percent polyolefin having a weight average molecular weight of about 50,000 to about 500,000 and about 98 to 2 weight percent finely divided polytetrafluoroethylene, to form said composite in which said polyolefin does not remain as discrete, identifiable particles after melt mixing with said polymer matrix, and said matrix is not the same as the polyolefin in the lubricant.
Claim 3
Dependent Claim
21 words
A method according to claim 1 wherein said polyolefin is selected from the group consisting of polyethylene, polypropylene and ethylene copolymers.
Claim 4
Dependent Claim
20 words
A method according to claim 1 wherein said polytetrafluoroethylene has a weight average molecular weight of less than about 4,000,000.
Claim 5
Dependent Claim
27 words
A method according to claim 1 wherein said blend comprises about 20 to 80 weight percent polyolefin and about 80 to 20 weight percent finely divided polytetrafluoroethylene.
Claim 6
Dependent Claim
21 words
A method according to claim 1 wherein said polyolefin and said polytetrafluoroethylene are blended prior to incorporation into the polymer matrix.
Claim 7
Dependent Claim
22 words
A method according to claim 1 wherein said polymer matrix is selected from the group consisting of thermoplastic polymers and thermosetting polymers.
Claim 8
Dependent Claim
35 words
A method according to claim 1 wherein said polymer matrix comprises a thermoplastic polymer selected from the group consisting of polyamides, polyesters, polyoxymethylene, polyphenylene sulfide, aromatic carbonate polymer, styrene homopolymers and copolymers, polyolefins and polyurethanes.
Claim 9
Dependent Claim
45 words
A method according to claim 1 wherein said polymer matrix comprises a polyamide selected from the group consisting of polyhexamethylene adipamide, polyhexamethylene sebacamide, polycaprolactam, polycapryllactam, polyhexamethylene dodecanamide, polyhexamethyl azeleamide, polyundecanoamide, polylauryllactam, polyamide modified with carboxylic acids and olefin copolymer, and blends of the above polyamides.
Claim 10
Dependent Claim
31 words
A method according to claim 1 wherein said polymer matrix comprises a polyester selected from the group consisting of polyalkylene terephthalates, polyalkylene terephthalate copolymers of the polyether-ester type, and mixtures thereof.
Claim 11
Dependent Claim
16 words
A method according to claim 1 wherein said polymer matrix comprises a polyoxymethylene homopolymer or copolymer.
Claim 12
Dependent Claim
26 words
A method according to claim 1 wherein said polymer matrix comprises an aromatic carbonate polymer in which the polycarbonate resin is based on Bisphenol-A and phosgene.
Claim 13
Dependent Claim
39 words
A method according to claim 1 wherein said polymer matrix comprises a styrene homopolymers or copolymer selected from the group consisting of polystyrene, poly-α-methyl styrene, acrylonitrile-butadiene-styrene, styrene-butadiene styrene, acrylonitrile-styrene, styrene-maleic anhydride, styrene-maleic anhydride-methacrylate, and styrenic alloys with poly,2-6-dimethyl-1,4-phenylene ether.
Claim 14
Dependent Claim
39 words
A method according to claim 1 wherein said polymer matrix comprises a polyolefin of a different type than the polyolefin which comprises the lubricant, said polyolefin matrix being selected from the group consisting of polyethylene, polypropylene and polyolefin copolymers.
Claim 15
Dependent Claim
15 words
A method according to claim 1 wherein said polymer matrix comprises a linear thermoplastic polyurethane.
Claim 16
Dependent Claim
27 words
A method according to claim 1 wherein said polymer matrix is selected from the group consisting of thermosetting polyesters, thermosetting polyimides, phenolics, epoxies, ureas, melamines and furan.
Claim 17
Dependent Claim
14 words
A method according to claim 1 wherein said polymer composite also contains a filler.
Claim 18
Dependent Claim
14 words
A method according to claim 1 wherein said composite also contains a reinforcing agent.
Claim 19
Dependent Claim
13 words
A method according to claim 1, wherein said polymer matrix is a rubber.
Claim 20
Dependent Claim
13 words
A method according to claim 1, wherein said polymer matrix is an elastomer.
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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) | 1993-07-30 | 1994-01-29 | 1994-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-30 | 1998-01-29 | 1998-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-30 | 2002-01-29 | 2002-07-31 | $7700.00 | Window Closed / Lapsed |