US 12,103,338 B2
Sealant layer with barrier, tire containing same, and related processes
Jared J. Griebel, Orange Village, OH (US); Kung-Ching Liao, Copley, OH (US); Brian S. Alexander, Westfield, IN (US); Bradley S. Plotner, Akron, OH (US); and Ross W. Widenor, Munroe Falls, OH (US)
Assigned to Bridgestone Americas Tire Operations, LLC, Nashville, TN (US)
Appl. No. 16/467,109
Filed by Bridgestone Americas Tire Operations, LLC, Nashville, TN (US)
PCT Filed Dec. 14, 2017, PCT No. PCT/US2017/066368
§ 371(c)(1), (2) Date Jun. 6, 2019,
PCT Pub. No. WO2018/122179, PCT Pub. Date Jun. 21, 2018.
Claims priority of provisional application 62/434,638, filed on Dec. 15, 2016.
Prior Publication US 2019/0389256 A1, Dec. 26, 2019
Int. Cl. B60C 19/12 (2006.01); B29C 73/16 (2006.01); B29C 73/18 (2006.01)
CPC B60C 19/122 (2013.01) [B29C 73/163 (2013.01); B29C 73/18 (2013.01)] 21 Claims
 
1. A tire containing a tire sealant layer comprising
a rubber portion having an upper surface and a lower surface, the rubber portion having
an elongation at break of 400 to 1200% and comprising a mixture of
i. 100 parts of at least one rubber selected from the group consisting of butyl rubber (optionally halogenated), natural rubber, polyisoprene, polybutadiene rubber, styrene-butadiene rubber, styrene-butadiene-isoprene rubber, isoprene-butadiene rubber, polychloroprene rubber, EPDM, nitrile rubber, polyisobutylene, and combinations thereof wherein at least 60 parts of the 100 parts of rubber comprises butyl rubber, halogenated butyl rubber, EPDM, or a combination thereof;
ii. 310-500 phr of at least one tackifier;
iii. one or more extenders in a total amount of 10-55 phr;
iv. optionally at least one hydroscopic substance in an amount of 0.5 to 10 phr; and
v. a cure package; and
a barrier layer upon the lower surface of the rubber portion wherein the barrier layer has an inner surface facing towards the rubber portion and an outer surface facing away from the rubber portion,
wherein the sealant layer has a thickness of 2-8 mm and the tire includes an inner liner having either a radially inward facing surface to which the tire sealant layer is adhered or a radially outward facing surface to which the tire sealant layer is adhered,
wherein the inner liner comprises a layer of butyl or halogenated butyl rubber, a spray-on composition having gas barrier properties, or a combination thereof, and
wherein the barrier layer comprises a metal foil, a polymeric film that is resistant to migration of oil, or a combination thereof.