Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2011-05-10
2011-05-10
Eashoo, Mark (Department: 1767)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S199000, C508S117000, C508S138000, C508S181000, C522S104000, C522S156000, C524S546000, C526S255000
Reexamination Certificate
active
07939605
ABSTRACT:
The invention relates to the field of chemistry and relates to long-term stable oil PTFE dispersions, such as can be used, for example, in transmissions or bearings, and a method for the production thereof. The object of the present invention is therefore to disclose a long-term stable oil PTFE dispersion as well as a simple and cost-effective method for the production thereof. The object is attained with an oil PTFE dispersion comprising PTFE particles and a monoolefinically or polyolefinically unsaturated oil, wherein molecules of the olefinically unsaturated oil are covalently/chemically coupled to PTFE (primary) particle surfaces via radical reactions, and wherein a permanent charge separation between the PTFE particle surfaces and the coupled oil molecules is present and a fine dispersion of the PTFE particles in the oil or oil mixture is present. The object is furthermore attained through a method in which the modified PTFE (emulsion) polymers are mixed with persistent perfluoro (peroxy) radicals jointly with an olefinically unsaturated oil and subsequently the modified PTFE (emulsion) polymers are subjected to a mechanical stress.
REFERENCES:
patent: 3933656 (1976-01-01), Reick
patent: 4465607 (1984-08-01), Cottell
patent: 5744539 (1998-04-01), McCoy et al.
patent: 5846447 (1998-12-01), Beatty
patent: 251988 (1987-12-01), None
patent: 36 42 617 (1988-04-01), None
patent: 10351812 (2005-06-01), None
patent: 10351813 (2005-06-01), None
patent: 102004016873 (2005-10-01), None
patent: 102004016876 (2005-10-01), None
patent: 2857373 (2005-01-01), None
patent: 11021577 (1999-01-01), None
patent: 2003113390 (2003-04-01), None
patent: 9300742 (1994-12-01), None
patent: 295402 (1992-07-01), None
Ivanov et al., “Tribological Properties of the Grease Containing Polytetrafluouethylene and Ultradispersed Diamonds,”Jounal of Friction and Wear, vol. 25, No. 1, pp. 88-92 (2004).
Driescher et al., “PTFE-modifizierte Schmierstoffe in der Feingeraetetechnik,”Schmierungstechnik, Berlin 15 (1984) 7.
Abstract of RU 2212418 published Sep. 20, 2003.
Palios et al., “Behaviour of PTFE suspensions in rolling/sliding contacts,” Tribology Series (1996), Publisher: Elsevier Science B.V.
Buie-Hatcher Nicole M
Eashoo Mark
Greenblum & Bernstein P.L.C.
Leibniz—Institut Fuer Polymerforschung Dresden E.V.
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