Elastomer composition having a very good dispersion of the charge in the elastomer matrix
AssigneesCompagnie Generale Des Etablessements Michelin, Michelin Recherche et Technique S.A.
InventorsMarc Sevignon, Cecile Belin
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Abstract
The invention relates to a rubber composition based on at least one diene elastomer, a reinforcing filler including at least carbon black, having a specific surface area CTAB greater than or equal to 130 m2/g, a plasticizing hydrocarbon resin, the vitreous transition temperature of which, Tg, is greater than 20° C., and the softening point of which is less than 170° C., and a cross linking system, the dispersion of the filler in the elastomeric matrix having a Z score greater than or equal to 70.
Claims18
A process for preparing a composition comprising:
- at least one diene elastomer,
- a reinforcing filler comprising at least carbon black having a CTAB specific surface area greater than or equal to 130 m2/g,
- a plasticizing hydrocarbon resin having a glass transition temperature, Tg, which is greater than 20° C. and a softening point which is less than 170° C., and
- a crosslinking system,
- wherein the reinforcing filler is dispersed in the composition such that the dispersion of the reinforcing filler in the composition has a Z score greater than or equal to 70,
- which comprises:
- preparing a first masterbatch comprising the at least one diene elastomer and the carbon black, and the first masterbatch exhibiting a dispersion of the carbon black in a matrix including the at least one diene elastomer which has a Z score greater than or equal to 80,
- incorporating the first masterbatch and the plasticizing hydrocarbon resin in a mixer to form a mixture, and thermomechanically kneading the mixture until a maximum temperature of between 130° C. and 200° C. is reached,
- cooling the mixture to a temperature of less than 100° C.,
- subsequently incorporating the crosslinking system into the mixture,
- kneading the mixture until a maximum temperature of less than 120° C. is reached.
A masterbatch based on:
- at least one diene elastomer, reinforcing filler comprising at least carbon black having a CTAB specific surface area greater than or equal to 130 m2/g, a plasticizing hydrocarbon resin, having a glass transition temperature, Tg, which is greater than 20° C. and a softening point which is less than 170° C., wherein the reinforcing filler is dispersed in a matrix including the at least one diene elastomer and the plasticizing hydrocarbon resin such that the dispersion has a Z score greater than or equal to 70.
A masterbatch based on:
- at least one diene elastomer, a reinforcing filler comprising at least carbon black having a CTAB specific surface area greater than or equal to 130 m2/g, a plasticizing hydrocarbon resin, having a glass transition temperature, Tg, which is greater than 20° C. and a softening point which is less than 170° C., which is obtained from a first masterbatch comprising the at least one diene elastomer and the carbon black, and wherein the dispersion of the carbon black in a matrix including the at least one diene elastomer of the first masterbatch has a Z score greater than or equal to 80.
Dependencies are inferred from the claim text.