The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 07, 1997
Filed:
Oct. 03, 1994
Warren E Jamison, Edmonds, WA (US);
E/M Corporation, West Lafayette, IN (US);
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 resin that does not include a polyglycol. The composition is prepared by mixing the components in an extrusion machine or in a torque rheometer while applying heat. A strand of the composition is thus extruded and cut into pellets suitable for injection molding into various types of desired objects.