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1. (WO2001004203) TYRE CASING WHEREOF THE SIDEWALLS CAN COMPRISE A GLAZED FILM

Pub. No.:    WO/2001/004203    International Application No.:    PCT/EP2000/006621
Publication Date: Fri Jan 19 00:59:59 CET 2001 International Filing Date: Thu Jul 13 01:59:59 CEST 2000
IPC: B60C 1/00
C08K 5/41
C08L 21/00
Applicants: SOCIETE DE TECHNOLOGIE MICHELIN
MICHELIN RECHERCHE ET TECHNIQUE, S.A.
BATAILLE, François
RINGOT, Claude
Inventors: BATAILLE, François
RINGOT, Claude
Title: TYRE CASING WHEREOF THE SIDEWALLS CAN COMPRISE A GLAZED FILM
Abstract:
The invention concerns a tyre casing whereof the sidewalls comprise a vulcanised elastomer composition, and a method for forming an even glazed film on at least one of said sidewalls. The invention is characterised in that said composition comprises in combination: between 0.3 and 5 parts wt.% of elastomer parts of a polymer comprising, on either side of an oxy radical, respectively an alkyl group and at least an alkene polyoxide block of formula (CnH2nO)z which is bound to a hydrogen atom at the chain end, and between 0.5 and 10 parts wt.% of elastomer parts of an alkaline metal salt of an alkylsulphonic or alkylsulphuric acid. The invention also concerns a method for forming an even glazed film on said sidewalls which consists in exposing the latter for at least 48 hours, in a chamber at 25 °C at least, to an ozone environment of at least 20 parts per hundred millions. The invention is particularly useful for protecting said casing against the visible effects of migrations of antioxidants and anti-ozone agents present in said sidewalls.