Self sealing tire

An uncured pneumatic tire which is comprised of a generally toroidal-shaped supporting carcass with an outer circumferential tread, two spaced beads, at least one ply extending from bead to bead, sidewalls extending radially from and connecting said tread to said beads, a sealant layer which is disposed inwardly from the supporting carcass, and an innerliner which is disposed inwardly from the sealant layer, wherein the sealant layer consists of polyisobutylene, a peroxide, optionally a filler, optionally an antioxidant, optionally a processing oil, optionally a pigment, optionally a colorant, and optionally polyethylene glycol, wherein the polyisobutylene has a number average molecular weight which is within the range of 30,000 to 100,000, wherein the sealant layer has a storage modulus (G′) at 40° C., 1 Hz, and 5% strain which is within the range of 0.005 to 0.2 MPa as measured by RPA, wherein the sealant layer is further comprised of low molecular weight polypropylene as a reinforcing filler and a plasticizer, wherein the low molecular weight polypropylene has a weight average molecular weight which is within the range of about 4,000 to about 40,000, wherein the reinforcing filler is included at a level which is within the range of 10 phr to 50 phr, wherein the plasticizer is included at a level which is within the range of about 2 phr to about 30 phr.

An uncured pneumatic tire which is comprised of a generally toroidal-shaped supporting carcass with an outer circumferential tread, two spaced beads, at least one ply extending from bead to bead, sidewalls extending radially from and connecting said tread to said beads, and a sealant layer which is disposed inwardly from the supporting carcass, and an innerliner which is disposed inwardly from the sealant layer, wherein said circumferential tread is adapted to be ground-contacting, wherein the sealant layer consists of the polyisobutylene, optionally a filler, optionally an antioxidant, optionally a processing oil, optionally a pigment, optionally a colorant, optionally polyethylene glycol, optionally a peroxide in pure form, and optionally a peroxide, wherein the polyisobutylene has a viscosity average molecular weight which is within the range of 70,000 to 95,000, and wherein the sealant layer is void of butyl rubber.

An uncured pneumatic tire which is comprised of a generally toroidal-shaped supporting carcass with an outer circumferential tread, two spaced beads, at least one ply extending from bead to bead, sidewalls extending radially from and connecting said tread to said beads, and a sealant layer which is disposed inwardly from the supporting carcass, wherein said circumferential tread is adapted to be ground-contacting, and wherein the sealant layer is consists of polyisobutylene, optionally a filler, optionally an antioxidant, optionally a processing oil, optionally a pigment, optionally a colorant, optionally polyethylene glycol, optionally a peroxide in pure form, optionally a peroxide, and optionally a graphene.