Rubber devulcanization process

Details Rubber devulcanization process Rubber devulcanization process

1996-10-21

1998-08-25

Buttner, David

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

Synthetic resins

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

521 41, 5253331, 5253332, 525362, 528488, C08J 1116, C08J 1118, C08F 800

Patent

active

057983941

ABSTRACT:
A process for devulcanizing and functionalizing 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. Functional groups derived from the solvent molecules bond to the devulcanized rubber's polymeric backbone. In addition to the functionalized devulcanized rubber polymer, carbon black may also be recovered for re-use in accordance with the process of the present invention. The functionalized 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
patent: 5602186 (1997-02-01), Myers
Kirk-Othmer, Encyclopedia of Chemical Technology, "Recycling (Rubber)", vol. 19, p. 1005, (1982).

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