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Blocked Mercapto

  • Momentive (GE-OSi) NXT

  • (EtO)3Si(CH2)3SC(O)C7H15

  • S 8.8%, Si 7.7%, EtO 37%

  • Mixing

    • Good high temperature stability

    • Processing 1+1

2000’s

  • US patent applications (2007) ~ 10

The blocked mercapto class is the last commercial class to have some acceptance. It’s major advantage is that processing behavior is very good. The recommended mixing procedure is one stage with high temperatures followed by adding the cure system. The lower level of sulfur and silanol groups requires some compounding adjustments, as does TESPD when compared to TESPT. The material cost has to be weighed against processing cost savings. All these silanes give off ethanol during processing. From published work the evolved ethanol is only part of that shown as theory. This VOC is part of the processing concerns of the tire industry.

STP0260

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