Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1978-03-24
1979-07-17
DeBenedictis, Thomas
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
2605676M, 2606065F, 260607B, B29H 1900, C08C 206
Patent
active
041614640
ABSTRACT:
A devulcanized rubber composition is disclosed which is obtained by low temperature phase transfer catalyzed devulcanization of commercial scrap rubber, such as a vulcanized polyisoprene rubber, butadiene-styrene rubber, cis-polybutadiene rubber used for vehicle tires. The devulcanized rubber of this invention is distinguishable from conventional reclaim rubber in that devulcanized rubber is substantially free of polysulfide crosslinks which are selectively broken during the process of this invention with negligible main chain scission.
A process for devulcanization of scrap rubber is disclosed comprising (a) comminuting the scrap to obtain vulcanizate particles in the size range from about 325 U.S. Standard mesh (44 microns) to about 6 mesh (3.36 mm), (b) swelling the vulcanizate particles with an organic solvent having dissolved therein a predetermined concentration of an onium salt, and (c) contacting the vulcanizate particles, at a temperature below about 150.degree. C., with an aqueous solution containing OH.sup.- ions to selectively disrupt enough polysulfide crosslinks to produce a devulcanized, recyclable rubber.
REFERENCES:
patent: 2415449 (1947-02-01), Sverdrup et al.
patent: 2633602 (1953-04-01), Sverdrup et al.
patent: 2653348 (1953-09-01), Elgin et al.
patent: 2653915 (1953-09-01), Elgin et al.
patent: 2804651 (1957-09-01), Peterson
patent: 3051990 (1962-09-01), Peterson
patent: 4046834 (1977-09-01), Lee et al.
patent: 4104205 (1978-08-01), Novotny et al.
Jour. Poly. Sci., XIX, 237-254 (1956).
Reclaiming Synthetic Rubber, Kilbourne, in Rubber Age, Feb. 1949, pp. 581 ff.
Conover, in Rubber Age, Jun. 1945, pp. 308 ff.
Chem. Abs., 31:P6503(8), 36:2755, 36:P2756(6).
DeBenedictis Thomas
Lindsay James R.
The B. F. Goodrich Company
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