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OwnerMaurizio Galimberti, Luigi Fino +2inventors
InventorsMaurizio Galimberti, Luigi Fino, Claudio Zanichelli, Enrico Albizzati
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Method for improving processability and storage stability of a silica filled elastomeric composition, said method comprising adding to said composition a thermoplastic polymer having a main hydrocarbon chain to which hydroxy groups are linked, said polymer having a weight-average molecular weight of at least 8,000. Preferably, the method further comprises adding to the silica filled elastomeric composition a polymer containing functional groups reactive with said hydroxy groups. The polymer containing hydroxy groups is highly effective in reducing and stabilizing viscosity of the composition, even when used in relatively low amounts, while maintaining or even enhancing the reinforcement effect of silica on the elastomeric composition. The resulting composition is particularly suitable to produce tyres, and particularly tyre treads.
Method for improving processability and storage stability of a silica filled elastomeric composition, said method comprising mixing at least an elastomeric diene polymer with a reinforcing filler comprising silica, characterized in that said method further comprises adding to said composition a thermoplastic polymer having a main hydrocarbon chain to which hydroxy groups are linked, said polymer containing hydroxy groups having a weight-average molecular weight of at least 8,000.
Method according to anyone of the preceding claims, wherein the polymer containing hydroxy groups has a melting point of at least 160° C.
Method according to anyone of the preceding claims, wherein the polymer containing hydroxy groups is added in an amount of from 0.1 to 60 phr.
Method according to anyone of the preceding claims, wherein the polymer containing hydroxy groups is selected from:
Method according to anyone of the preceding claims, further comprising adding to said composition a polymer containing functional groups reactive with said hydroxy groups.
Method according to anyone of the preceding claims, wherein the polymer containing hydroxy groups is added to said composition pre-dispersed in an elastomeric polymer.
Method according to anyone of the preceding claims, wherein silica is added in an amount of from 0.1 to 120 phr.
Method according to anyone of the preceding claims, further comprising adding to said composition carbon black as additional reinforcing filler.
Method according to anyone of the preceding claims, further comprising adding to said composition a silica coupling agent.
Method according to anyone of the preceding claims, further comprising adding to said composition an effective amount of a silanol condensation catalyst.
An elastomeric composition comprising:
Composition according to anyone of claims from 22 to 24, wherein the polymer containing hydroxy groups has a melting point of at least 160° C.
Composition according to anyone of claims from 22 to 27, wherein the polymer containing hydroxy groups has a melting point of at least 160° C.
Composition according to anyone of claims from 22 to 30, wherein the polymer containing hydroxy groups is present in an amount of from 0.1 to 60 phr.
Composition according to anyone of claims from 22 to 31, wherein the polymer containing hydroxy groups is selected from:
Composition according to anyone of claims from 22 to 32, wherein the polymer containing hydroxy groups comprises repeating units having the formula
Composition according to anyone of claims from 22 to 34, further comprising a polymer containing functional groups reactive with said hydroxy groups.
Composition according to anyone of claims from 35 to 37, wherein the functionalized polymer has an amount of functional groups of from 0.05 to 50 parts by weight, based on 100 parts by weight of the polymer.
Composition according to anyone of claims from 22 to 39, wherein the polymer containing hydroxy groups is pre-dispersed in an elastomeric polymer.
Composition according to anyone of claims from 22 to 41, wherein silica is present in an amount of from 0.1 to 120 phr.
Composition according to anyone of claims from 22 to 43, wherein the reinforcing filler further comprises carbon black.
Composition according to anyone claims from 22 to 44, further comprising a silica coupling agent.
Composition according to anyone of claims from 22 to 45, further comprising sulfur or a sulfur-containing vulcanizing agent.
Elastomeric article obtained by cross-linking the elastomeric composition according to anyone of claims from 22 to 46.
Tyre for vehicle wheels comprising at least an element including an elastomeric material, characterized in that said elastomeric material is obtained by cross-linking a composition comprising:
Tread belt comprising an elastomeric composition according to anyone of claims from 22 to 46.
Dependencies are inferred from the claim text.