Rubber-metal composite and pneumatic tire using the same

1. A rubber-metal composite comprised by embedding metal reinforcing cords in a rubber composition comprising from 0.05 to 10 parts by mass of a benzothizole anticorrosive and/or a benzotriazole anticorrosive per 100 parts of a diene rubber, wherein the anticorrosive is at least one selected from the group consisting of (2-benzothiazylthio)acetic acid, 3-(2-benzothiazylthio)propionic acid, 1-[N,N-bis(2-ethylhexyl)aminomethyl]tolyltriazole, 1-[N,N-bis(hydroxyethyl)aminomethyl]tolyltriazole, carboxybenzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole, and 2,2′-[[(methyl-1H-benzotriazole-1-yl)methyl]imino]bisethanol.

2. The rubber-metal composite according to claim 1 , wherein the rubber composition further comprises from 3 to 15 parts by mass of sulfur per 100 parts by mass of the diene rubber.

3. A pneumatic tire using a rubber-metal composite comprised by embedding metal reinforcing cords in a rubber composition comprising from 0.05 to 10 parts by mass of a benzothiazole anticorrosive and/or a benzotriazole anticorrosive per 100 parts of a diene rubber, the anticorrosive comprising at least one selected from the group consisting of (2-benzothiazylthio)acetic acid, 3-(2-benzothiazylthio)propionic acid, 1-[N,N-bis(2-ethylhexyl)amino methyl]tolyltriazole, 1-[N,N-bis(hydroxyethyl)aminomethyl] tolyltriazole, carboxybenzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole, and 2,2′-[[(methyl-1H-benzotriazole-1-yl)methyl]imino]bisethanol.

4. The pneumatic tire according to claim 3 , wherein the metal reinforcing cords are at least one selected from the group consisting of a belt cord, a carcass cord, and a bead cord.

5. The rubber-metal composite according to claim 3 , wherein the metal reinforcing cords are brass-plated.

6. The rubber-metal composite according to claim 1 , wherein the rubber composition further comprises from 3 to 15 parts by mass of sulfur per 100 parts by mass of the diene rubber.

7. The rubber-metal composite according to claim 1 , wherein the benzothizole anticorrosive and/or a benzotriazole anticorrosive comprises from 0.1 to 2.0 parts by mass per 100 parts of the diene rubber.

8. The rubber-metal composite according to claim 1 , wherein the rubber composition further comprises from 4 to 9 parts by mass of sulfur per 100 parts by mass of the diene rubber.

9. The rubber-metal composite according to claim 1 , further comprising a vulcanizing agent and a filler.

10. The rubber-metal composite according to claim 9 , wherein the filler comprises zinc oxide, a compounded amount thereof being from 5 to 15 parts by mass of the diene rubber.

11. The rubber-metal composite according to claim 9 , wherein the filler comprises zinc oxide, a compounded amount thereof being from 7 to 11 parts by mass of the diene rubber.

12. The rubber-metal composite according to claim 1 , further comprising, as the cobalt, an organic cobalt compound in the amount of 0.1 to 3.0 parts by mass per 100 parts by mass of the diene rubber and selected from the group consisting of: cobalt benzoate, cobalt naphthenate, cobalt sterate, cobalt neodecanoate, cobalt ortho-borate, cobalt octoate, and a cobalt boron complex.

13. The rubber-metal composite according to claim 1 , further comprising, as the cobalt, an organic cobalt compound in the amount of 0.2 to 1.0 parts by mass per 100 parts by mass of the diene rubber and selected from the group consisting of: cobalt benzoate, cobalt naphthenate, cobalt sterate, cobalt neodecanoate, cobalt ortho-borate, cobalt octoate, and a cobalt boron complex.

14. The rubber-metal composite according to claim 1 , wherein the diene rubber comprises a natural rubber.

15. The rubber-metal composite according to claim 1 , wherein the anticorrosive comprises the benzothizole anticorrosive, the benzothizole anticorrosive comprising one of (2-benzothiazylthio)acetic acid and 3-(2-benzothiazylthio)propionic acid.

16. The rubber-metal composite according to claim 1 , wherein the anticorrosive comprises the benzotriazole anticorrosive, the benzotriazole anticorrosive comprising at least two of 1-[N,N-bis(2-ethylhexyl)aminomethyl]tolyltriazole, 1-[N,N-bis(hydroxyethyl)aminomethyl]tolyltriazole, carboxybenzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole, 1 [N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole, and 2,2′-[[(methyl-1H-benzotriazole-1-yl)methyl]imino]bisethanol.

17. The rubber-metal composite according to claim 1 , wherein the metal reinforcing cords are brass-plated.

18. A rubber-metal composite comprised by embedding metal reinforcing cords in a rubber composition comprising:

from 0.05 to 10 parts by mass of a benzothizole anticorrosive and/or a benzotriazole anticorrosive per 100 parts of a diene rubber;

from 3 to 15 parts by mass of sulfur per 100 parts by mass of the diene rubber;

from 5 to 15 parts by mass of zinc oxide per 100 parts by mass of the diene rubber; and

from 0.1 to 3.0 parts by mass of an organic cobalt compound per 100 parts by mass of the diene rubber

wherein the anticorrosive comprises at least one selected from the group consisting of (2-benzothiazylthio)acetic acid, 3-(2-benzothiazylthio)propionic acid, 1-[N,N-bis(2-ethylhexyl)aminomethyl]tolyltriazole, 1-[N,N-bis(hydroxyethyl)aminomethyl]tolyltriazole, carboxybenzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]methylbenzotriazole, 1-[N,N-bis(2-ethylhexyl)aminomethyl]benzotriazole, and 2,2′-[[(methyl-1H-benzotriazole-1-yl)methyl]imino]bisethanol.

19. The rubber-metal composite according to claim 18 , wherein the metal reinforcing cords are brass-plated.