Pneumatic tire and method of manufacturing same
A pneumatic tire is vulcanized using a bladder provided with a coating layer formed of a release agent, and includes a sealant layer disposed on an inner surface of a tread portion in a tire circumferential direction, the release agent having a thickness of from 0.1 μm to 100 μm in at least a placement region of the sealant layer, detected using an electron microscope.
1. A pneumatic tire vulcanized using a bladder provided with a coating layer formed of a release agent, the pneumatic tire comprising:
a sealant layer disposed on an inner surface of a tread portion in a tire circumferential direction; and
the release agent, the release agent having a thickness of from 0.1 μm to 100 μm in at least a placement region of the sealant layer, detected using an electron microscope.
2. The pneumatic tire according to claim 1 , wherein the sealant layer comprises butyl and/or natural rubber.
3. The pneumatic tire according to claim 2 , wherein
the sealant layer has a sheet-like shape extending in the tire circumferential direction, and
the sealant layer has a thickness of from 0.5 mm to 5.0 mm.
4. The pneumatic tire according to claim 3 , wherein the sealant layer is disposed with its lateral center positioned within a range of ±10 mm with respect to a tire equator.
5. The pneumatic tire according to claim 4 , wherein the sealant layer has a half width that is 100% or greater of a half width of a belt layer having a minimum width, and is 105% or less of a half width of a belt layer having a maximum width.
6. The pneumatic tire according to claim 1 , wherein
the sealant layer has a sheet-like shape extending in the tire circumferential direction, and
the sealant layer has a thickness of from 0.5 mm to 5.0 mm.
7. The pneumatic tire according to claim 1 , wherein the sealant layer is disposed with its lateral center positioned within a range of ±10 mm with respect to a tire equator.
8. The pneumatic tire according to claim 1 , wherein the sealant layer has a half width that is 100% or greater of a half width of a belt layer having a minimum width, and is 105% or less of a half width of a belt layer having a maximum width.
9. A method of manufacturing a pneumatic tire for vulcanizing a green tire using a bladder provided with a coating layer formed of a release agent, the method comprising:
disposing a sealant layer on an inner surface of a tread portion of a vulcanized pneumatic tire, the sealant layer being disposed in a placement region in a tire circumferential direction,
the release agent having a thickness of from 0.1 μm to 100 μm in at least the placement region of the sealant layer, detected using an electron microscope.
10. The method of manufacturing a pneumatic tire, according to claim 9 , wherein a step of forming the coating layer on the bladder has a coating time t (hour) and a temperature T (° C.) of the coating layer that satisfy conditions, t≥0.0001T 2 −0.07T+9, and T≤180° C.
11. The method of manufacturing a pneumatic tire, according to claim 10 , wherein the sealant layer comprises butyl and/or natural rubber.
12. The method of manufacturing a pneumatic tire, according to claim 11 , wherein
the sealant layer has a sheet-like shape extending in the tire circumferential direction,
the sealant layer has a thickness of from 0.5 mm to 5.0 mm, and
when the sealant layer is disposed on a tire inner surface, a sealant extruded from a die is disposed bonded directly to the tire inner surface by compression bonding.
13. The method of manufacturing a pneumatic tire, according to claim 11 , wherein
when the sealant layer is disposed on a tire inner surface, a sealant in a string-like shape is disposed applied in a continuous spiral form, and
the sealant layer is disposed with its lateral center positioned within a range of ±10 mm with respect to a tire equator.
14. The method of manufacturing a pneumatic tire, according to claim 13 , wherein the sealant layer has a half width that is 100% or greater of a half width of a belt layer having a minimum width, and is 105% or less of a half width of a belt layer having a maximum width.
15. The method of manufacturing a pneumatic tire, according to claim 9 , wherein the sealant layer comprises butyl and/or natural rubber.
16. The method of manufacturing a pneumatic tire, according to claim 9 , wherein
the sealant layer has a sheet-like shape extending in the tire circumferential direction, and
the sealant layer has a thickness of from 0.5 mm to 5.0 mm.
17. The method of manufacturing a pneumatic tire, according to claim 16 , wherein when the sealant layer is disposed on a tire inner surface, a sealant extruded from a die is disposed bonded directly to the tire inner surface by compression bonding.
18. The method of manufacturing a pneumatic tire, according to claim 9 , wherein when the sealant layer is disposed on a tire inner surface, a sealant in a string-like shape is disposed applied in a continuous spiral form.
19. The method of manufacturing a pneumatic tire, according to claim 9 , wherein the sealant layer is disposed with its lateral center positioned within a range of ±10 mm with respect to a tire equator.
20. The method of manufacturing a pneumatic tire, according to claim 9 , wherein the sealant layer has a half width that is 100% or greater of a half width of a belt layer having a minimum width, and is 105% or less of a half width of a belt layer having a maximum width.