US 11,383,554 B2Granted

Elastomeric materials for components of tyres and tyres comprising modified silicate fibres

AssigneePirelli Tyre S.p.A.

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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Abstract

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.

Claims10

Dependent claims

A process for modifying silicate fibres with needle-shaped morphology of nanometric size comprising:

providing silicate fibres with needle-shaped morphology of nanometric size comprising magnesium,
suspending the silicate fibres in a suitable liquid medium to generate a suspension,
adding, to the suspension, at least one acid compound, and bringing the medium to a pH ranging from 2 to 4,
maintaining the medium at the pH range from 2 to 4, by further adding the at least one acid compound, to extract from 10% to 70% by weight of magnesium from the silicate fibres to generate modified silicate fibres, wherein the modified silicate fibres are substantially preserved with a crystalline structure and needle-shaped morphology, and
separating the modified silicate fibres from the liquid medium, wherein the modified silicate fibres with needle-shaped morphology of nanometric size comprise 9.5% to 12% of magnesium.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/343,669Filed 20 Oct 2017
Priority: IT 10201600010831826 Oct 2016
Published: US 2020/0055335 A120 Feb 2020
Granted: 12 Jul 2022
Term ends: Not estimatedThe source records don’t support an estimate.

Classification27 codes

B60C 1/0008
Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition: compositions of the inner liner
C08K 7/10
Inorganic: silicon-containing compounds
B29D 30/0601
Pneumatic tyres or parts thereof: vulcanising tyres; Vulcanising presses for tyres
B60C 1/00
Tyres characterised by the chemical composition or the physical arrangement or mixture