Vitrofil Corporation

Elio Rial

Corrado Brichta

Natale Tettamanzi

A process is described for imparting a better adhesion between reinforcing materials and a plastic matrix, characterized in that it comprises the steps of treating the reinforcing material surface with at least one organic compound of a tetravalent metal selected from the group consisting of zirconium and tin, at a temperature ranging from 250.degree. to 650.degree. C., of applying onto the reinforcing material surface so treated, at a lower temperature, at least one silane coupling agent and, finally, of drying the so-treated reinforcing material.

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Milan, Italy

Elio Rial