C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/5511, 152/78
C08L 23/22 (2006.01) B60C 5/14 (2006.01) C08G 18/10 (2006.01) C08L 75/04 (2006.01) C09K 3/10 (2006.01)
Patent
CA 1086440
ABSTRACT OF THE DISCLOSURE: A curable and solventless sealant two-component composition consists essentially of a mixture of (a) a mixture of about 100 parts of a low molecular weight elastomeric iso- cyanate terminated prepolymer, having from about 3.5 to about 4.5% NCO content, from about 250 parts to about 400 parts of a medium process oil having a Brookfield viscosity at 22°C. of about 10 to 500 cps, and from about 50 parts to about 70 parts of an uncured butyl rubber having a Staudinger molecular weight of 5,000 to 15,000, and, (b) a mixture of from about 150 parts to about 250 parts of a polyol having a molecular weight of from 400 to 5,000 and about 0.8 milliequivalent per gram hydroxyl, from about 40 to about 65 parts of an uncured butyl rubber having a Staudinger molecular weight of 5,000 to 15,000, from about 225 to about 275 parts of a medium process oil as in (a) and from about 0.1 to about 10.0 parts of a catalyst for the reaction of the prepolymer and the polyol; components (a) and (b) are individually storage stable and mixed together in a volume ratio of from about 1.0 to 1Ø The sealant composition of the invention is used in pneumatic tires containing an air-retaining liner forming an integral part of the tire and in inner tubes contained within a tire casing, to seal any hole that may be formed by a piercing object, such as a nail.
273983
Koch Russell W.
Oberster Arthur E.
Firestone Tire & Rubber Company (the)
Robic Robic & Associes/associates
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