Pneumatic tire with air permeation preventive layer
First Claim
1. A pneumatic tire having a belt layer having circumferentially extending end portions on either side thereof, an air permeation preventive layer inside of said belt layer with respect to a tread portion of said tire and comprising a film composed of a polymer composition containing a thermoplastic resin or a blend of a thermoplastic resin and an elastomer component and having an air permeation coefficient of not more than 25×
- 10-12 cc·
cm/cm2 ·
sec·
cmHg and a Young'"'"'s modulus of 1 to 1000 MPa, said air permeation preventive layer being arranged so as to substantially cover an inner circumferential surface of the tire in at least two regions, each region extending from a first position at one of the two end portions of the belt layer to a second position 20 mm in from one of said first positions and toward a crown center of the tire and at most in a region extending between two third positions, each of which is 20 mm out from one of said first positions and toward a bead portion of the tire.
1 Assignment
0 Petitions
Accused Products
Abstract
A pneumatic tire has an air permeation preventive layer comprising a film composed of a polymer composition containing a thermoplastic resin or a blend of a thermoplastic resin and an elastomer having an air permeation coefficient of not more than 25×10-12 cc·cm/cm2 ·sec·cmHg and a Young'"'"'s modulus of 1 to 1000 MPa which is arranged so as to substantially cover the inner surface of the tire at least in the range of 20 mm from the position of the two ends of the belt to the direction of the crown center and is also arranged so as to substantially cover the inner surface of the tire at the crown center side of a position a maximum of 20 mm from the position of the two ends of the belt to the direction of the bead portion and applies an air permeation preventive layer comprised of rubber so as to substantially cover the rest of the inner surface of the tire and using an air permeation preventive layer having an actual elongation at break of at least 15% in the circumferential direction and radial direction at the tire side portions in a range of at least 0.5H to 0.65H of the tire sectional height H.
72 Citations
15 Claims
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1. A pneumatic tire having a belt layer having circumferentially extending end portions on either side thereof, an air permeation preventive layer inside of said belt layer with respect to a tread portion of said tire and comprising a film composed of a polymer composition containing a thermoplastic resin or a blend of a thermoplastic resin and an elastomer component and having an air permeation coefficient of not more than 25×
- 10-12 cc·
cm/cm2 ·
sec·
cmHg and a Young'"'"'s modulus of 1 to 1000 MPa, said air permeation preventive layer being arranged so as to substantially cover an inner circumferential surface of the tire in at least two regions, each region extending from a first position at one of the two end portions of the belt layer to a second position 20 mm in from one of said first positions and toward a crown center of the tire and at most in a region extending between two third positions, each of which is 20 mm out from one of said first positions and toward a bead portion of the tire. - View Dependent Claims (2, 3, 4)
- 10-12 cc·
-
5. A pneumatic tire having a belt layer having circumferentially extending end portions on either side thereof, a first air permeation preventive layer inside of said belt layer with respect to a tread portion of said tire and comprising a film composed of a polymer composition containing a thermoplastic resin or a blend of a thermoplastic resin and an elastomer component and having an air permeation coefficient of not more than 25×
- 10-12 cc·
cm/cm2 ·
sec·
cmHg and a Young'"'"'s modulus of 1 to 1000 MPa, said first air permeation preventive layer being arranged so as to substantially cover an inner circumferential surface of the tire in at least two regions, each region extending from a first position at one of the two end portions of the belt layer to a second position 20 mm in from one of said first positions and toward a crown center of the tire and at most in a region extending between two third positions, each of which is 20 mm out from one of said first positions and toward a bead portion of the tire, and a second air permeation preventive layer having an actual elongation at break of at least 15% in a circumferential direction and in a radial direction of the tire at two side portions on the inside of either side of the tire, said two side portions extending at least from a position 0.5H to a position 0.65H, where H is a sectional height of the tire. - View Dependent Claims (6, 7, 8, 9, 10, 11)
- 10-12 cc·
-
12. A pneumatic tire having a belt layer having circumferentially extending end portions on either side thereof, a first air permeation preventive layer inside of said belt layer with respect to a tread portion of said tire and comprising a film composed of a polymer composition containing a thermoplastic resin or a blend of a thermoplastic resin and an elastomer component and having an air permeation coefficient of not more than 25×
- 10-12 cc·
cm/cm2 ·
sec·
cmHg and a Young'"'"'s modulus of 1 to 1000 MPa, said first air permeation preventive layer being arranged so as to substantially cover an inner circumferential surface of the tire in at least two regions, each region extending from a first position at one of the two end portions of the belt layer to a second position 20 mm in from one of said first positions and toward a crown center of the tire and at most in a region extending between two third positions, each of which is 20 mm out from one of said first positions and toward a bead portion of the tire, and a second air permeation preventive layer comprising a film composed of said polymer composition of said first air permeation preventive layer and having an air permeation coefficient of not more than 25×
10-12 cc·
cm/cm2 ·
sec·
cmHg and a Young'"'"'s modulus of 1 to 350 MPa at two side portions on the inside of either side of the tire, said two side portions extending at least from a position 0.5H to a position 0.65H, where H is a sectional height of the tire, wherein said tire includes a carcass layer containing a carcass cord and a thickness t of rubber between the carcass cord of the carcass layer and the second air permeation preventive layer at least at said side portions of the tire between the positions 0.5H to 0.65H of the tire is at least 0.3 mm. - View Dependent Claims (13, 14, 15)
- 10-12 cc·
Specification