为补强填料的无机填料、一种作为(无机填料/二烯弹性体)偶联剂的多官能有机硅烷,该多官能有机硅烷具有至少两个用“X”和“Y”表示的官能,其一方面通过X官能与弹性体接枝,另一方面通过Y官能与无机填料接枝,其特征在于所述Y官能是羟基甲硅烷基官能(Si-OH)。优选地,该有机硅烷是羟基 Is a reinforcing filler inorganic filler, a polyfunctional organosilane as (inorganic filler / diene elastomer) coupling agent having at least two functional groups represented by “X” and “Y” , Which is grafted on the one hand with the elastomer via the X function and on the other hand via an Y function with an inorganic filler, characterized in that the Y function is a hydroxysilyl function (Si-OH). Preferably, the organosilane is hydroxyl