Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Compositions to be polymerized by wave energy wherein said...
Reexamination Certificate
2010-07-30
2011-10-04
Berman, Susan W (Department: 1765)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Compositions to be polymerized by wave energy wherein said...
C522S116000, C522S120000, C522S125000, C522S156000, C526S242000, C526S250000
Reexamination Certificate
active
08030367
ABSTRACT:
The invention relates to the field of chemistry and relates to radically coupled PTFE polymer powders that can be used, for example, as tribomaterials, and a method for the production thereof. There is disclosed radically coupled PTFE polymer powders which, when incorporated into a matrix as PTFE polymer compound, exhibit improved wear resistance, and furthermore a simple and efficient method for the production thereof. There is provided radically coupled PTFE polymer powders comprising radiation-chemically and/or plasma-chemically modified PTFE powders, onto the particle surface of which homopolymers, copolymers or terpolymers are radically coupled via a reaction in dispersion or in solid. There is also provided a method in which PTFE powders with reactive perfluoroalkyl-(peroxy) radical centers after a radiation-chemical and/or plasma-chemical modification are reacted in dispersion or in solid with the addition of polymerizable, olefinically unsaturated monomers, whereby during the reaction a polymer-forming reaction occurs.
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Kluepfel Bernd
Lehmann Dieter
Berman Susan W
Greenblum & Bernstein P.L.C.
Leibniz-Institut Fuer Polymerforschung Dresden E.V.
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