Rubber devulcanization process

Details Rubber devulcanization process Rubber devulcanization process

1995-10-27

1997-02-11

Hamilton, III, Thomas

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

C08J 1110

Patent

active

056021860

ABSTRACT:
A process for devulcanizing a rubber vulcanizate by desulfurization involves suspending a rubber vulcanizate crumb in a solvent which preferably swells the rubber vulcanizate before or during the devulcanization reaction and adding an alkali metal, such as sodium, to the suspension. The alkali metal cleaves mono-, di- and polysulfidic cross-linkages in the rubber vulcanizate to liberate rubber polymer having a molecular weight substantially equal to that of the rubber polymer prior to vulcanization. Carbon black may also be recovered for re-use in accordance with the process of the present invention. Devulcanized rubber may be subjected to a re-vulcanization reaction without separation of rubber polymer from the solvent by addition of an appropriate curing mixture.

REFERENCES:
patent: 3787315 (1974-01-01), Bearden, Jr. et al.
patent: 3976559 (1976-08-01), Bearden, Jr. et al.
patent: 4161464 (1979-07-01), Nicholas
Kirk-Othmer, Encyclopedia of Chemical Technology, "Recycling (Rubber)". vol. 19, p. 1005.

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