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AssigneePirelli Pneumatici S.p.A.
InventorsStephane Schaal, Aubert Y. Coran, Syed K. Mowdood
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The disclosure relates to a process for improving the processability, storage stability and/or cure rate of an uncured silica reinforced rubber composition where silica comprises the major filler in the reinforced rubber composition, which comprises combining a mixture comprising, rubber, silica and at least one organic compound having a low molecular weight and a functional group wherein said functional group is at least an epoxy group, such as an epoxy/ether, epoxy/hydroxyl, epoxy/ester, epoxy/amine, ether/amine, episulfide, episulfide/ether, episulfide/hydroxyl, episulfide/ester functional group located in a terminal or sterically unhindered position in the molecule of said organic compound where the molecular weight of said organic compound having a low molecular weight is less than 7,000, or the organic compound comprises an abietyl, styrenated resorcinol formaldehyde, or ester hydroxyl organic compound having a hydroxyl, ester, and optionally, an ether group, such as an ester diol.
A process for improving the processability, storage stability and/or cure rate of an uncured silica reinforced rubber composition where silica comprises the major filler in said reinforced rubber composition, comprising combining a mixture comprising rubber, silica and at least one organic compound comprising an organic compound of relatively low molecular weight that contains at least one functional group, wherein said functional group is at least an epoxy functional group located in terminal or sterically unhindered positions in the molecule of said organic compound, or said organic compound comprises an abietyl compound, styrenated resorcinol formaldehyde epoxy polymer compound, or an ester hydroxyl organic compound containing at least one hydroxyl group, at least one ester group, and optionally an ether group, where the molecular weight of said organic compound of relatively low molecular weight is less than about 7,000.
A rubber composition of matter comprising a mixture of rubber, silica as the major filler in said composition, and at least one organic compound comprising an organic compound of relatively ow molecular weight, and containing at least one functional group, wherein said functional group is at least an epoxy, epoxy/ether, epoxy/hydroxyl, epoxy/ester, epoxy/amine, ether/amine, cycloaliphatic ether/hydroxyl, episulfide, episulfide/amine, episulfide/ether, episulfide/hydroxyl, or episulfide/ester functional group located in a terminal or sterically unhindered position in the molecule of said organic compound, or said organic compound comprises an abietyl comound, styrenated resorcinol formaldehyde epoxy polymer compound, or an ester hydroxyl organic compound having at least one hydroxyl group, at least one ester group, and optionally an ether group, or the reaction products of said mixture, where the molecular weight of said organic compound having relatively low molecular weight is less than about 7,000.
Dependencies are inferred from the claim text.