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Bifunctional Silanes

  • TESPT

1970-80’s

  • [((CH3CH2)O)3Si(CH2)3]2S4

  • S 20%, Si 8.8%, EtO 50%

  • Rauline (Michelin) 1991

    • Solution SBR, HD silica, TESPT

    • 2+1 special mix procedure

    • Low rolling resistant tread

  • US patent applications (2007) 100

During the 1970-80’s Degussa introduced TESPT which became the silane standard for silica compounding. The material both coupled the silica and donated sulfur to the rubber network. In the early 90’s Michelin applied for patents which became the basis of a major change in the tire tread industry. This tread is based on tailored made polymers, silica, and silane coupling agents. The mixing was done with two stages before the cure system is added. This tread became known as the green tire because of the treads role in improving gas mileage. The silane is normally added at levels between 5-8% of the silica. In current US Patent applications this silane still receives the bulk of the references. These references include patents on the rubber, filler, silane, and applications beyond tire tread. The price of this silane is low because of very active competition and supply. We have this available as SCA 98 in 100% liquid, 50% on Carbon black, and 50% in pellet form. Reference books on silanes published pre90’s do not discuss this class of silanes. This silane has to be considered to be an important invention for rubber compounding.

STP0260

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