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AssigneesPirelli Tyre S.p.A., Universita' Degli Studi Milano-Bicocca
InventorsLuca GIANNINI, Luciano TADIELLO, Thomas HANEL, Elkid COBANI, Barbara DI CREDICO, Massimiliano D'ARIENZO, Roberto SCOTTI, Franca MORAZZONI, Jorge Jose PEREZ CACHO, Daniel Javier JULVE SEBASTIAN
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The present invention relates to new vulcanisable elastomeric compositions for components of tyres, comprising modified silicate fibres as fillers. The silicate fibres are modified according to the process with controlled pH of the invention. In addition, the invention regards components of tyres, comprising elastomeric materials obtainable by vulcanisation of said compositions, and tyres for vehicles comprising one or more of said components. The vulcanised elastomeric materials according to the invention are characterised by good static and dynamic mechanical properties, in particular by particularly low hysteresis. Advantageously the tyres of the invention comprising one or more of said components have a limited rolling resistance.
1) Elastomeric composition for components of tyres comprising at least:
4) Composition as claimed in any one of the preceding claims, wherein said modified silicate fibres with needle-shaped morphology of nanometric size (b) are present in a quantity from 1 phr to 60 phr, preferably from 3 phr to 40 phr, more preferably from 5 phr to 30 phr.
5) Composition as claimed in any one of the preceding claims comprising a standard reinforcement filler (c), selected from among carbon black, precipitated amorphous silica, amorphous silica of natural origin, non-modified silicate fibres and mixtures thereof.
6) Composition as claimed in any one of the preceding claims, comprising said standard reinforcement filler (c) in a quantity comprised between 1 phr and 120 phr, preferably between 20 phr and 90 phr.
7) Composition as claimed in any one of the preceding claims, wherein the overall quantity of modified fibres (b) and standard filler (c) is comprised between 20 phr and 120 phr, more preferably between 30 phr and 90 phr.
8) Composition as claimed in any one of the preceding claims wherein said modified silicate fibres with needle-shaped morphology of nanometric size (b) comprise 9.5% to 12% of magnesium.
14) Process for modifying silicate fibres with needle-shaped morphology of nanometric size comprising
Dependencies are inferred from the claim text.