A pneumatic tire having a circumferential tread (2) comprising an outer tread cap layer (3) and an underlying sub tread cap layer (4) is disclosed. The outer tread cap layer (3) is of a rubber composition comprising conjugated diene based elastomers comprising 20 to 80 phr of natural cis 1,4-polyisoprene rubber (NR) and 80 to 20 phr of cis 1,4-polybutadiene rubber (BR), wherein the polybutadiene rubber (BR) comprises a combination of a designated (BR1) and a specialized (BR2) cis 1,4-polybutadiene rubber. The underlying sub tread layer (4) is of a rubber composition comprising conjugated diene based elastomers comprising 40 to 60 phr of natural cis 1,4-polyisoprene rubber (NR) and 60 to 40 phr of cis 1,4-polybutadiene rubber (BR), wherein the polybutadiene rubber (BR) comprises a combination of the designated (BR1) and the specialized (BR2) cis 1,4-polybutadiene rubber. The specialized cis 1,4-polyisoprene rubber has a microstructure comprising 90 to 99 percent cis 1,4-isomeric units, a number average molecular weight (Mn) in a range of from 90,000 to 220,000 and a heterogeneity index (Mw/Mn) in a range of from 2.5/1 to 5/1. The designated cis 1,4-polybutadiene rubber has a microstructure comprising 96 to 99 percent cis 1,4-isomeric units, a number average molecular weight (Mn) in a range of from 150,000 to 300,000 and a heterogeneity index (Mw/Mn) in a range of from 1.5/1 to 2/1.


    Access

    Download


    Export, share and cite



    Title :

    TIRE WITH STRATIFIED TREAD COMPOSITION


    Additional title:

    REIFEN MIT GESCHICHTETER LAUFFLÄCHENZUSAMMENSETZUNG
    PNEU AYANT UNE COMPOSITION DE BANDE DE ROULEMENT STRATIFIÉE


    Contributors:

    Publication date :

    2017-01-25


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    C08L COMPOSITIONS OF MACROMOLECULAR COMPOUNDS , Massen auf Basis makromolekularer Verbindungen / B60C VEHICLE TYRES , Fahrzeugreifen / C08K Verwendung von anorganischen oder nichtmakromolekularen organischen Stoffen als Zusatzstoffe , USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES AS COMPOUNDING INGREDIENTS



    Tire with stratified tread composite

    MEZA ROBERTO CERRATO / ZHAO JUNLING / FORCINITI LEANDRO et al. | European Patent Office | 2016

    Free access

    TIRE TREAD RUBBER COMPOSITION AND TIRE TREAD

    SATO RYO / KANBARA HIROSHI / UEHARA YOSUKE | European Patent Office | 2025

    Free access

    RUBBER COMPOSITION FOR TIRE TREAD, TIRE TREAD, AND TIRE

    HORIUCHI NATSUKI | European Patent Office | 2019

    Free access

    RUBBER COMPOSITION FOR TIRE TREAD, TIRE TREAD AND TIRE

    NAGAI HARUKA | European Patent Office | 2021

    Free access

    RUBBER COMPOSITION FOR TIRE TREAD, TIRE TREAD AND TIRE

    NAGAI HARUKA | European Patent Office | 2021

    Free access