Low friction bearing material and method
US3994814A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 20, 1975 |
| Grant date | Nov 30, 1976 |
| Priority date | — |
| Expiry date | Jan 20, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L101/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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% by volume of polytetrafluoroethylene polymer and the remainder being a filler material, said filler material comprising a first filler material and a second, different filler material, said first filler material being selected from the group of soft metals and soft metallic oxides or sulfides having lubricating properties such as lead and its oxides, cadmium and its oxides, titanium oxide, zinc oxide, molybdenum disulfide, and antimony and its oxides and trioxides, said second filler material being selected from a group of hard filler materials such as bronze, copper alloy, glass and ceramic. The composition is readily formed by injection molding and hot extrusion methods and exhibits wear resistance at room temperatures substantially equal to polytetrafluoroethylene compositions which are fabricated by cold forming and sintering techniques.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.