Acetal-based self lubricating compositions
US5591808A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 3, 1994 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Oct 3, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L71/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A composition of acetal resin infused with one or more polyglycols to impart an improved tribological property. The composition is produced by mixing a powdered or granulated polyoxymethylene homopolymer (or copolymer) in the range from about 75% to about 95% by weight, with from about 25 to about 5% by weight of one or more polyglycols. Examples disclosed include compositions in which the single polyglycol comprises a polyethylene glycol, an ethylene oxide-propylene glycol monobutyl ether, a diethylene glycol n-butyl ether, an ethylene oxide-propylene oxide polyglycol, and a propylene glycol monobutyl ether. Preferably, if an oil soluble polyglycol is added, either a polyethylene glycol or a propylene glycol monobutyl ether is included to serve as a compatibilizer for the oil soluble polyglycol. One preferred embodiment includes 80% by weight of the powdered acetal, 14% by weight of the polyethylene glycol, which serves as the compatibilizer, and 3% by weight of the ethylene oxide-propylene glycol monobutyl ether, which is the oil soluble polyglycol. This example exhibits a substantially reduced friction coefficient and a much greater contact stress withstand level than acetal res…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.