Tire tread compounds comprising partially crosslinked...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 7/00 (2006.01) B29D 30/08 (2006.01) B60C 1/00 (2006.01) C08L 21/00 (2006.01)

Patent

CA 2245295

In a tire having a tread with cap/base construction, a regulated amount of partially crosslinked natural rubber in a tire tread compound increases the uncured ("green") stiffness, tensile strength and tear resistance of a green compound used for the base without adversely affecting physical properties of the tread after it is cured. Such green stiffness is particularly useful in the construction of a tread for a pneumatic tire, which tread is of cap/base construction because stiffness provides requisite dimensional stability of both cap and base (in the tread) during the curing of the tire. The amount of partially crosslinked natural rubber used in a tread compound depends upon the extent of crosslinking in the natural rubber, the non-crosslinked remainder being virgin latex.

Dans un pneumatique à bande de roulement de type sommet/base, une quantité prédéterminée de caoutchouc naturel partiellement réticulé ajoutée à un composé pour bande de roulement contribue à accroître la rigidité initiale de même que la résistance à la traction et au déchirement d'un composé utilisé pour la base sans incidences adverses sur les propriétés de la bande de roulement après vulcanisation. La rigidité initiale est particulièrement utile dans la réalisation de bandes de roulement pour pneumatiques dont la bande de roulement est de type sommet/base du fait que la rigidité assure la stabilité dimensionnelle de la base et du sommet (de la bande de roulement) durant l'opération de vulcanisation. La quantité de caoutchouc naturel partiellement réticulé utilisée dans le composé pour bande de roulement dépend du degré de réticulation du caoutchouc naturel, le restant du caoutchouc non réticulé étant du latex vierge.

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