US3879301A — Low friction bearing material and method

Claim 1

Independent Claim 86 words

A low friction bearing composition comprising a major portion of a thermoplastic resin other than polytetrafluoroethylene and a minor portion of a filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material consisting essentially of at least 50 percent by volume of polytetrafluoroethylene polymer and the remainder being a filler material, said filler material being selected from the group consisting of carbon, glass, asbestos, silica, zinc, cadmium, lead and the oxides thereof, bronze, molybdenum disulfide, tungsten disulfide, alumina, zirconia, titanium oxide, cupric oxide, boron nitride, kieselguhr and mixtures thereof.

Claim 2

Dependent Claim 86 words

A low friction bearing composition comprising a major portion of a thermoplastic resin other than polytetrafluoroethylene and a minor portion of a filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material consisting essentially of at least 50 percent by volume of polytetrafluoroethylene polymer and the remainder being a filler material, said filler material being selected from the group consisting of carbon, glass, asbestos, silica, zinc, cadmium, lead and the oxides thereof, bronze, molybdenum disulfide, tungsten disulfide, alumina, zirconia, titanium oxide, cupric oxide, boron nitride, kieselguhr and mixtures thereof.

Claim 3

Dependent Claim 87 words

A LOW FRICTION BEARING COMPOSITION COMPRISING A MAJOR PORTION OF A THERMOPLASTIC RESIN OTHER THAN POLYTETRAFLUOROETHYLENE AND A MMINOR PORTION OF A FILLED POLYTETRAFLUOROETHYLENE MATERIAL, SAID FILLED POLYTETRAFLUOROMETHYLENE MATERIAL CONSISTING ESSENTIALLY OF AT LEAST 50 PERCENT BY VOLUME OF POLYTETRAFLUO ORETHYLENE POLYMER AND THE REMAINDER BEING A FILLER MATERIAL SAID FILLER MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF CARON, GLASS, ASBESTOS, SILICA, ZINC, CADMIUM, LEAD AND THE OXIDES THEREOF, BRONZE, MOLYBDNUM DISULFIDE, TUNGSTEN DISSULFIDE, ALUMINA, ZIRCONIA, TITANIUM OXIDE, CUPRIC OXIDE, BORON NITRIDE, KIESELGUHR AND MIXTURES THEREOF.

Claim 4

Dependent Claim 87 words

A LOW FRICTION BEARING COMPOSITION COMPRISING A MAJOR PORTION OF A THERMOPLASTIC RESIN OTHER THAN POLYTETRAFLUOROETHYLENE AND A MMINOR PORTION OF A FILLED POLYTETRAFLUOROETHYLENE MATERIAL, SAID FILLED POLYTETRAFLUOROMETHYLENE MATERIAL CONSISTING ESSENTIALLY OF AT LEAST 50 PERCENT BY VOLUME OF POLYTETRAFLUO ORETHYLENE POLYMER AND THE REMAINDER BEING A FILLER MATERIAL SAID FILLER MATERIAL BEING SELECTED FROM THE GROUP CONSISTING OF CARON, GLASS, ASBESTOS, SILICA, ZINC, CADMIUM, LEAD AND THE OXIDES THEREOF, BRONZE, MOLYBDNUM DISULFIDE, TUNGSTEN DISSULFIDE, ALUMINA, ZIRCONIA, TITANIUM OXIDE, CUPRIC OXIDE, BORON NITRIDE, KIESELGUHR AND MIXTURES THEREOF.

Claim 5

Dependent Claim 41 words

The composition of claim 1 wherein said thermoplastic resin comprises 75 percent by volume to about 85 percent by volume of said composition and said filled polytetrafluoroethylene material comprises 15 percent by volume to 25 percent by volume of said composition.

Claim 6

Dependent Claim 39 words

The composition of claim 1 wherein said thermoplastic resin is selected from the group consisting of polyacrylate resins, polyester resins, polyolefin resins, phenoxy resins, polycarbonate resins, polyamide resins, polyimide resins, polysulfone resins, polyarylsulfide resins, polyether resins and mixtures thereof.

Claim 7

Dependent Claim 38 words

The composition of claim 1 wherein said filled polytetrafluoroethylene material consists essentially of 50 percent by volume of 95 percent by volume of polytetrafluoroethylene and from 5 percent by volume to 50 percent by volume of filler material.

Claim 8

Dependent Claim 14 words

The composition of claim 4 wherein said filler material comprises cadmium oxide and bronze.

Claim 9

Dependent Claim 52 words

The composition of claim 1 comprising about 77 percent by volume of acetal resin and about 23 percent by volume of filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material comprising about 83 percent by volume of polytetrafluoroethylene resin, about 13 percent by volume cadmium oxide and about 4 percent by volume of bronze.

Claim 10

Dependent Claim 54 words

The composition of claim 1 comprising about 75 percent by volume of polyphenylene sulfide resin and about 25 percent by volume of filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material comprising about 80 percent by volume of polytetrafluoroethylene resin, about 16 percent by volume of cadmium oxide and about 4 percent by volume of bronze.

Claim 11

Dependent Claim 109 words

A low friction bearing element in which at least a bearing surface thereof comprises a substantially homogeneous mixture consisting essentially of a major portion of a thermoplastic resin other than polytetrafluoroethylene and a minor portion of filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material comprising 50 percent by volume to 95 percent by volume of polytetrofluoroethylene polymer and from 5 percent by volume to 50 percent by volume of filler material, said filler material is selected from the group consisting of zinc, cadmium, lead and the oxides thereof, glass, bronze, carbon, graphite, molbdenum disulfide, tungston disulfide, alumina, zirconia, titanium oxide, asbestos, silica, boron nitride, kieselguhr, cupric oxide and mixtures thereof.

Claim 12

Dependent Claim 109 words

A low friction bearing element in which at least a bearing surface thereof comprises a substantially homogeneous mixture consisting essentially of a major portion of a thermoplastic resin other than polytetrafluoroethylene and a minor portion of filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material comprising 50 percent by volume to 95 percent by volume of polytetrofluoroethylene polymer and from 5 percent by volume to 50 percent by volume of filler material, said filler material is selected from the group consisting of zinc, cadmium, lead and the oxides thereof, glass, bronze, carbon, graphite, molbdenum disulfide, tungston disulfide, alumina, zirconia, titanium oxide, asbestos, silica, boron nitride, kieselguhr, cupric oxide and mixtures thereof.

Claim 13

Dependent Claim 42 words

The low friction bearing element of claim 8 wherein said thermoplastic resin is selected from the group consisting of polyacrylate resins, polyester resins, polyolefin resins, phenoxy resins, polycarbonate resins, polyamide resins, polyimide resins, polysulfone resins, polyarylsulfide resins, polyether resins and mixtures thereof.

Claim 14

Dependent Claim 36 words

The low friction bearing element of claim 8 wherein at least said bearing surface consists essentially of about 75 percent by volume of polyphenylene sulfide resin and about 25 percent by volume of filled polytetrafluoroethylene material.

Claim 15

Dependent Claim 35 words

The low friction beAring element of claim 8 wherein at least said bearing surface consists essentially of about 77 percent by volume of acetal resin and about 23 percent by volume of filled polytetrafluoroethylene material.

Claim 16

Dependent Claim 20 words

The bearing element of claim 8 wherein said filler material consists essentially of a mixture of cadmium oxide and bronze.

Claim 17

Dependent Claim 151 words

A process for forming a bearing element wherein at least a bearing surface thereof is formed of a low friction material comprising the steps of forming a substantially homogenous blend consisting essentially of a major portion of a thermoplastic resin other than polytetrafluoroethylene and a minor portion of a filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material comprising between 95 percent by volume and 50 percent by volume of polytetrafluoroethylene and between 5 percent by volume and 50 percent by volume of a filler, said filler material being selected from the group consisting of carbon, glass, asbestos, silica, zinc, cadmium, lead and the oxides thereof, bronze, molybdenum disulfide, tungsten disulfide, alumina, zirconia, titanium oxide, cupric oxide, boron nitride, kieselguhr and mixtures thereof subjecting said blend to heat to soften said resin and forming said blend while said resin is in the softened condition into at least a surface of said bearing element.

Claim 18

Dependent Claim 151 words

A process for forming a bearing element wherein at least a bearing surface thereof is formed of a low friction material comprising the steps of forming a substantially homogenous blend consisting essentially of a major portion of a thermoplastic resin other than polytetrafluoroethylene and a minor portion of a filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material comprising between 95 percent by volume and 50 percent by volume of polytetrafluoroethylene and between 5 percent by volume and 50 percent by volume of a filler, said filler material being selected from the group consisting of carbon, glass, asbestos, silica, zinc, cadmium, lead and the oxides thereof, bronze, molybdenum disulfide, tungsten disulfide, alumina, zirconia, titanium oxide, cupric oxide, boron nitride, kieselguhr and mixtures thereof subjecting said blend to heat to soften said resin and forming said blend while said resin is in the softened condition into at least a surface of said bearing element.

Claim 19

Dependent Claim 23 words

The process of claim 13 wherein said blend is injection molded to form a bearing element consisting essentially of said low friction material.

Claim 20

Dependent Claim 23 words

The process of claim 13 wherein said blend is extruded onto a substrate thereby to form a low friction surface on said substrate.

Claim 21

Dependent Claim 16 words

The process of claim 15 including the step of bonding said extruded blend onto said substrate.

Claim 22

Dependent Claim 81 words

A low friction bearing composition comprising more than 50 percent by volume of acetal resin and less than 50 percent by volume of filled polytetrafluoroethylene material, said filled PTFE material comprising at least 50 percent by volume of polytetrafluoroethylene polymer and the remainder being a filler material selected from the group consisting of carbon, glass, asbestos, silica, zinc, cadmium, lead and the oxides thereof, bronze, molybdenum disulfide, tungsten disulfide, alumina, zirconia, titanium oxide, cupric oxide, boron nitrite, kieselguhr and mixtures thereof.

Claim 23

Dependent Claim 81 words

A low friction bearing composition comprising more than 50 percent by volume of acetal resin and less than 50 percent by volume of filled polytetrafluoroethylene material, said filled PTFE material comprising at least 50 percent by volume of polytetrafluoroethylene polymer and the remainder being a filler material selected from the group consisting of carbon, glass, asbestos, silica, zinc, cadmium, lead and the oxides thereof, bronze, molybdenum disulfide, tungsten disulfide, alumina, zirconia, titanium oxide, cupric oxide, boron nitrite, kieselguhr and mixtures thereof.

Claim 24

Dependent Claim 62 words

The composition of claim 17 wherein said acetal resin comprises about 77 percent by volume and said filled polytetrafluoroethylene material comprises about 23 percent by volume and wherein said filled polytetrafluoroethylene material comprises about 83 percent by volume of polytetrafluoroethylene and the filler comprising cadmium oxide and bronze, with the cadmium oxide being at least 50 percent by volume of said filler.

Claim 25

Dependent Claim 82 words

A low friction bearing composition comprising more than 50 percent by volume of polyphenylene sulfide resin and less than 50 percent by volume of filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material comprising at least 50 percent by volume of polytetrafluoroethylene polymer and the remainder being a filler material selected from the group consisting of carbon, glass, asbestos, silica, zinc, cadmium, lead and the oxides thereof, bronze, molybdenum disulfide, tungsten disulfide, alumina, zirconia, titanium ixide, cupric oxide, boron nitrite, kieselguhr and mixtures thereof.

Claim 26

Dependent Claim 82 words

A low friction bearing composition comprising more than 50 percent by volume of polyphenylene sulfide resin and less than 50 percent by volume of filled polytetrafluoroethylene material, said filled polytetrafluoroethylene material comprising at least 50 percent by volume of polytetrafluoroethylene polymer and the remainder being a filler material selected from the group consisting of carbon, glass, asbestos, silica, zinc, cadmium, lead and the oxides thereof, bronze, molybdenum disulfide, tungsten disulfide, alumina, zirconia, titanium ixide, cupric oxide, boron nitrite, kieselguhr and mixtures thereof.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1978-04-21	1978-10-21	1979-04-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1982-04-21	1982-10-21	1983-04-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1986-04-21	1986-10-21	1987-04-22	$7700.00	Window Closed / Lapsed

Low friction bearing material and method

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