Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Reexamination Certificate
2005-08-02
2005-08-02
Wyrozebski, Katarzyna (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
C521S040500, C521S041000
Reexamination Certificate
active
06924319
ABSTRACT:
A devulcanization product of comminuted scrap rubber of rubber granules, in which the sulfur bridges of the rubber granule surface are broken and activated for a new vulcanization, is produced by treating the rubber granules to swell the rubber structure of the granule surface and by mixing the treated rubber granules with a devulcanization formulation, acting mechanically and chemically reductively on the rubber granules, in a heating and cooling mixer combination. The rubber granules and the devulcanization formulation are heated to a temperature of 105-150° C. and subsequently immediately cooled. A devulcanization compound is prepared by mixing the devulcanization product with vulcanization and binding agents so as to coat the rubber granules uniformly with them The devulcanization compound can also be prepared by coating the swelled rubber granules in layers by admixing vulcanization agents such as accelerators, activators, auxiliary agents, binding agents, oxygen radical donors and scavengers.
REFERENCES:
patent: 4305850 (1981-12-01), Watabe et al.
patent: 6380269 (2002-04-01), Benko et al.
Alsdorf Peter
Krieg Reinhard
Wenske Günther
Huckett Gudrun E.
KET Kunststoff- und Elasttechnik GmbH
Spreerelast GmbH
Wyrozebski Katarzyna
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