Cord rubberized in situ comprising a composition comprising a styrene-butadiene copolymer
A metal cord is rubberized in situ by a rubber composition that includes a styrene-butadiene copolymer. The styrene-butadiene copolymer includes styrene units at a proportion of between 25% and 35% by weight, limits included, of a total weight of the styrene-butadiene copolymer. The styrene-butadiene copolymer also includes trans-1,4-bonds at a proportion of between 73% and 83% by weight, limits included, of a total weight of a butadiene part of the styrene-butadiene copolymer.
1. A metal cord comprising a rubber composition used to rubberize the metal cord in situ, wherein the rubber composition includes a styrene-butadiene copolymer, and wherein the styrene-butadiene copolymer includes:
styrene units at a proportion of between 27% and 31% by weight, limits included, of a total weight of the styrene-butadiene copolymer, and
trans-1,4-bonds at a proportion of between 73% and 83% by weight, limits included, of a total weight of a butadiene part of the styrene-butadiene copolymer.
2. The metal cord according to claim 1 , wherein the proportion of the trans-1,4-bonds is between 75% and 81% by weight, limits included, of the total weight of the butadiene part of the styrene-butadiene copolymer.
3. The metal cord according to claim 1 , wherein the styrene-butadiene copolymer includes cis-1,4-bonds at a proportion of between 12% and 21% by weight, limits included, of the total weight of the butadiene part of the copolymer.
4. The metal cord according to claim 3 , wherein the styrene-butadiene copolymer includes cis-1,4-bonds at a proportion of between 14% and 19% by weight, limits included, of the total weight of the butadiene part of the copolymer.
5. The metal cord according to claim 1 , wherein the styrene-butadiene copolymer includes vinyl units at a proportion of between 1% and 7% by weight, limits included, of the total weight of the butadiene part of the copolymer.
6. The metal cord according to claim 5 , wherein the styrene-butadiene copolymer includes vinyl units at a proportion of between 3% and 5% by weight, limits included, of the total weight of the butadiene part of the copolymer.
7. The metal cord according to claim 1 , wherein the rubber composition includes between 50 and 100 phr, limits included, of the styrene-butadiene copolymer.
8. The metal cord according to claim 7 , wherein the rubber composition includes between 70 and 100 phr, limits included, of the styrene-butadiene copolymer.
9. The metal cord according to claim 8 , wherein the rubber composition includes between 80 and 100 phr, limits included, of the styrene-butadiene copolymer.
10. The metal cord according to claim 1 ,
wherein the metal cord is embedded in a coating rubber composition, and
wherein the metal cord embedded in the coating rubber composition is incorporated in a semifinished product.
11. The metal cord according to claim 1 , wherein the metal cord is incorporated in a tire.
12. A process for manufacturing a metal cord that is rubberized in situ, the process comprising steps of:
manufacturing a rubber composition that includes a styrene-butadiene copolymer, wherein the styrene-butadiene copolymer includes:
styrene units at a proportion of between 27% and 31% by weight, limits included, of a total weight of the styrene-butadiene copolymer, and
trans-1,4-bonds at a proportion of between 73% and 83% by weight, limits included, of a total weight of a butadiene part of the styrene-butadiene copolymer; and
between two stages of assembling the metal cord, sheathing at least an internal portion of the metal cord with the rubber composition.