Abstract

Chemical direct reclaiming of rubber by mixing pulverulent scrap rubber having a particle size of at most 1 mm with a reducing agent, an oxidizable iron metal chloride and at least one plasticizer. The mixture is agitated for a short time, in the solid phase in air at a temperature of not more than 100° C., in a powder mixer for direct degradation of double bonds in the rubber. The reducing agent is from 0.2 to 1 weight % of phenyl hydrazine or diphenyl guanidine. The iron metal chloride is admixed in an amount of from 0.1 to 0.4 weight %. The plasticizer shall comprise at least one member from the group tall oil pitch and dipentene, and this plasticizer may be used in mixture with some other plasticizer. The amount of dipentene is at most 5 weight % and is from 0.5 to 5 weight % if the dipentene is used as the only plasticizer or is used in mixture with another plasticizer. The amount of tall oil pitch is at most 17.5 weight % and is from 7 to 17.5 weight % if the tall oil pitch is used as the only plasticizer or is used in mixture with a plasticizer other than dipentene. If tall oil pitch is used in mixture with dipentene, the amount of tall oil pitch varies in inverse proportion to the amount of dipentene and is from 8 to 16 weight % with dipentene amounts of from 5 to 0.5 weight %.

Other References

• Yamashita et al., Internatioal Polymer Science & Technology, vol. 3, No. 8, 1976, pp. T75-T81
• Yoshioka et al., Chem. Abs. 84, 45783h, 1976