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US 2018/0326784 A1Published application
Method for in situ isomerization of polybutadiene
AssigneeCompagnie Generale Des Etablissements Michelin
InventorConstantine KHRIPIN
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AssigneeCompagnie Generale Des Etablissements Michelin
InventorConstantine KHRIPIN
Estimating the term…
Methods for in situ isomerization if polybutadiene may include adding mixture components of the cross-linkable rubber composition into a mixer, the mixture components comprising at least 10 phr of a polybutadiene rubber having at least 80 wt % cis-bonds and up to 90 phr of a second rubber component having at least some dienic unsaturation and mixing the mixture components during a nonproductive phase. Such methods may include processing the mixture components on a mill during a productive phase, adding at least 3 phr of a disulfide isomerization agent and mixing the disulfide isomerization agent with the mixture components. The mixing may take place in an internal mixer with the isomerization agent added to the mixer or alternatively, it may be added to the mill after the mixture components have been dropped from the mixer for cooling on the mill.
A method for forming a rubber article from a cross-linkable rubber composition, the cross-linkable rubber composition having undergone in situ isomerization, the method comprising:
The method of any of the preceding claims, wherein the disulfide isomerization agent is selected from the group consisting of 2,2-dithiobis(benzothiazole), 2-nitro-p-tolyl disulfide, 4-(2-benzothiazolyldithio)morpholine, tetraethylthiuram disulfide and combinations thereof.
The method of any of the preceding claims, wherein mixing the mixture components during a nonproductive phase further comprises, wherein the mixing occurs in an internal mixer chamber.
The method of any of the preceding claims, wherein the mixture components comprise at least 40 phr of the polybutadiene rubber.
The method of any of the preceding claims, wherein the second rubber component has a glass transition temperature of no more than −50° C.
The method of any of the preceding claims, wherein the second rubber component is selected from wherein the second rubber component is selected from a second polybutadiene rubber, natural rubber or a styrene-butadiene rubber.
The method of any of the preceding claims, wherein the mixture components comprise 100 phr of the polybutadiene rubber.
The method of any of the preceding claims, wherein the polybutadiene comprises at least 95 wt % cis-bonds.
The method of any of the preceding claims, wherein the polybutadiene comprises at least 85 wt % cis-bonds
The method of any of the preceding claims, wherein the isomerization agent is tetraethylthiuram disulfide (TETD).
The method of any of the preceding claims, wherein the mixture components include between 4 phr and 10 phr of the isomerization agent.
The method of any of the preceding claims, wherein the mixture components include between 6 phr and 10 phr of the isomerization agent.
The method of any of the preceding claims, wherein the method further comprises adding a sulfur or peroxide curing agent to the mixture at the productive phase.
The method of any of the preceding claims, further comprising:
The method of any of the preceding claims, wherein the rubber article is a component of a tire and wherein forming the rubber article further comprises:
Dependencies are inferred from the claim text.