Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Reexamination Certificate
1999-05-03
2002-06-04
Maki, Steven D. (Department: 1733)
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
C152S524000, C152S525000, C152S555000, C152SDIG001
Reexamination Certificate
active
06397913
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a pneumatic tire, more particularly relates to a pneumatic tire using a rubber containing a specific hydrogenated NBR (that is, “a rubber composition containing, based on a total 100 parts by weight of rubber containing at least 40 parts by weight of an ethylenic unsaturated nitrile-conjugated diene-based highly saturated rubber having a content of conjugated diene units of not more than 30 percent, 0 to 120 parts by weight of zinc methacrylate and 0 to 60 parts by weight of carbon black and having a total amount of formulations of zinc methacrylate and carbon black of 10 to 120 parts by weight”) for part or all of the tire.
BACKGROUND ART
Known in the art is the use of hydrogenated NBR for tires etc., making use of the fact that vulcanized formulations of this with a zinc compound, methacrylic acid, and organic peroxide have extremely high strength characteristics (Japanese Unexamined Patent Publication (Kokai) No. 1-306443). There is the problem, however, that such hydrogenated NBR compositions are generally extremely difficult to bond with general purpose rubbers. Techniques are also being developed for bonding general purpose rubbers for tires and such members through a specific bonding layer to solve the problem of bonding (Japanese Unexamined Patent Publication (Kokai) No. 5-185805). Even with this method, however, the bonding force with the adjoining rubber is not sufficient. When applied to a tire, not only does the durability fall, but also, since two bonding layers are needed, there is the problem that the productivity of the tire worsens.
DISCLOSURE OF THE INVENTION
Therefore, an object of the present invention is to provide a pneumatic tire reducing the weight of the tire, lightening the rolling resistance, and improving the durability, abrasion resistance, cut resistance, and driving stability by constituting part or all of the part members in a tire by a rubber containing a specific hydrogenated NBR or by using a specific bonding rubber layer for the bonding layer between such part members and parts comprised of other general purpose rubbers when using the rubber containing a specific hydrogenated NBR for part of the part members and not requiring the inner layer required in the past due to the superior air barrier property of the hydrogenated NBR. Another object of the present invention is to provide a pneumatic tire using such a rubber containing a hydrogenated NBR as a reinforcing layer for part of the inside and outside layers of the tire or using it as a white or colored decorative member for the outer surface of the tire.
According to a first aspect of the present invention, an object of the present invention is the provision of a pneumatic tire which can strikingly improve the abrasion resistance and rolling resistance or improve the driving stability feeling and lighten the weight without reducing the high speed durability by applying a specific hydrogenated NBR rubber composition including the rubber containing a hydrogenated NBR and zinc methacrylate and/or carbon black for the members of the cap tread and/or under tread of the tire and further by using a specific bonding layer to strongly bond the cap tread and adjoining under tread or belt layer or the under tread and the adjoining rubber layer.
According to the present invention, there is provided a pneumatic tire having a cap tread which is comprised of a rubber composition containing, based on a total 100 parts by weight of rubber containing at least 70 parts by weight of hydrogenated NBR, 0 to 80 parts by weight of zinc methacrylate and 0 to 40 parts by weight of carbon black and having a total of the formulations of zinc methacrylate and carbon black of 10 to 120 parts weight, and providing between the cap tread and the adjoining rubber layer (normally an under tread layer or belt layer) a bonding rubber layer comprised of a rubber composition containing, based on a total 100 parts by weight of (A) at least one type of diene-based rubber selected from the group consisting of a natural rubber, polyisoprene rubber, polybutadiene rubber, and conjugated diene-aromatic vinyl copolymer rubber and (B) an acrylonitrile-butadiene copolymer rubber, (C) 5 to 80 parts by weight of an aromatic petroleum resin having an average molecular weight of 300 to 1500, a softening point of 50 to 160° C., and an iodine adsorption value of at least 20 g/100 g.
Further, according to the present invention, there is provided a pneumatic tire inserting between a cap tread and belt layer an under tread comprised of a rubber composition containing, based on a total 100 parts by weight of rubber containing at least 40 parts by weight of a hydrogenated NBR, 0 to 120 parts by weight of zinc methacrylate and 0 to 40 parts by weight of carbon black and having a total of the formulations of zinc methacrylate and carbon black of 10 to 120 parts by weight, and providing between the under tread and adjoining rubber layer a bonding rubber layer comprised of a rubber composition containing, based on a total 100 parts by weight of (A) at least one type of diene-based rubber selected from the group consisting of a natural rubber, polyisoprene rubber, polybutadiene rubber, and conjugated diene-aromatic vinyl copolymer rubber and (B) an acrylonitrile-butadiene copolymer rubber, (C) 5 to 80 parts by weight of an aromatic petroleum resin having an average molecular weight of 300 to 1500, a softening point of 50 to 160° C., and an iodine adsorption value of at least 20 g/100 g.
Further, according to the present invention, there is provided a pneumatic tire having, at a layer under a cap tread of a hydrogenated NBR rubber composition comprised of the composition of said cap tread, an under tread of a hydrogenated NBR rubber composition comprised of the composition of the under tread and having, between the under tread and the adjoining rubber layer, a bonding layer of a rubber composition comprised of the composition of the bonding rubber.
Further, according to the present invention, there is provided a pneumatic tire characterized in that a thickness of the bonding rubber layer positioned between the cap tread and the adjoining rubber layer is 0.1 to 4 mm; the thickness of the bonding layer positioned between the under tread and the adjoining rubber layer is 0.1 to 0.5 mm; the ratio of weight (A)/(B) of the component (A) and component (B) in the bonding rubber layer is 90/10 to 10/90; and the bonding rubber layer further contains at least one co-cross-linking agent selected from the group consisting of a methacrylic acid higher ester, triallyl isocyanurate, metal salt of methacrylic acid or acrylic acid, diallyl phthalate ester, and 1,2-polybutadiene and is cross-linked by an organic peroxide.
Further, according to a second aspect of the present invention, an object of the present invention is to provide a pneumatic tire which improves the run flat property by constituting a crescent sectional-shaped reinforcing liner inserted between a carcass layer of a side wall portion and inner liner layer by a specific rubber material and which strongly bonds the reinforcing liner and the adjoining rubber layer through a specific bonding rubber layer comprised of one layer.
According to the present invention, there is provided a pneumatic tire having at a side wall portion a crescent sectional-shape reinforcing liner layer comprised of a rubber composition containing, based on a total 100 parts by weight of a rubber containing 70 to 100 parts by weight of an ethylenic unsaturated nitrile-conjugated diene-based highly saturated copolymer rubber having a content of conjugated diene units of at least 30 percent by weight, 20 to 120 parts by weight of zinc methacrylate, containing no carbon black or not more than 40 parts by weight of the same, and having a total of formulations of zinc methacrylate and carbon black of not more than 120 parts by weight and bonding with an adjoining rubber layer through a bonding rubber layer containing, based on a total 100 parts by weight of (A) at least one type of diene-bas
Hashimura Yoshiaki
Higuchi Tadashi
Kanenari Daisuke
Shida Zenichiro
Arent Fox Kintner Plotkin & Kahn
Maki Steven D.
The Yokohama Rubber Co. Ltd.
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