Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Process of treating scrap or waste product containing solid...
Patent
1995-11-03
1998-06-23
Simmons, David A.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Process of treating scrap or waste product containing solid...
521 42, 521 43, 525343, C08J 1104
Patent
active
057706328
ABSTRACT:
A process for reclaiming elastomeric material from elemental sulphur-cured elastomeric material having a vulcanized network without using hexamethylene tetramine, by treating the sulphur-cured elastomeric material having a vulcanized network with one or more rubber delinking accelerators selected from the group of zinc salts of thiocarbamates and zinc salts of dialkyl dithiophosphates, 2-mercaptobenzothiazole or derivatives thereof, thiurams, guanidines, 4,4'-dithiomorpholine and sulphenamides, and a zinc oxide activator in an amount sufficient to act as an activator for the accelerator(s) to delink the elastomeric material at a temperature below 70.degree. C., whereby the vulcanized network is opened up or delinked to provide a curable reclaimed elastomeric material capable of being vulcanized without adding rubber vulcanizing chemicals. The invention also includes compositions capable of delinking the vulcanized network of sulphur-cured elastomeric materials including the accelerators and activator described above. The obtained recycled, or reclaimed, elastomeric material has desired physical and dynamic characteristics that render it suitable for use in molded goods or for admixture with fresh compounds in tires and related products.
REFERENCES:
patent: 2088920 (1937-08-01), Pickett
patent: 2415449 (1947-02-01), Sverdrup
patent: 4101463 (1978-07-01), Morgan et al.
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patent: 4211676 (1980-07-01), Watabe et al.
patent: 4340695 (1982-07-01), Schubart et al.
International Polymer Science and Technology, vol. 7, No. 6, 1980, Shawbury, Shrewsburey, Great Britain, pp 59-61, by Okamoto H. et al. `Mechanochemical Reclamation of Comminuted Tyre Srap Using Vulcanisation Accelerator`, p. 59, par. 1.1--p. 60, table 2, p. 61, par. 3.2.
Kormer Vitaly Abramovich
Mironyuk Vladimir Petrovich
Nikitina Natalya Alexeevna
Sekhar Balachandra Chakkinggal
Sotnikova Evelina Nikolayevna
Jones Kenneth M.
Simmons David A.
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