Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1997-02-11
1999-08-17
Johnstone, Adrienne C.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152548, 156134, B29D 3006, B60C 100, B60C 514, B60C 902
Patent
active
059388692
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a pneumatic tire, more particularly it relates to a lightweight pneumatic tire having a structure which can be manufactured with a good productivity without detracting from the resistance to air leakage, uniformity, rolling resistance, durability, etc.
BACKGROUND ART
Reduction of fuel consumption is one of the major technical issues in automobiles. As one of the means for this issue, demands for reduction of the weight of pneumatic tires have been strongly increased. On the other hand, an inner liner layer or other air permeation preventive layer comprised of a halogenated butyl rubber or other rubber having a low air permeability is conventionally provided at the inner surface of the pneumatic tire to maintain a constant tire air pressure.
However, a halogenated butyl rubber has a large hysteresis loss, and therefore, after vulcanization of the tire, when rippling is caused in the rubber of the inner surface of the carcass layer and the inner liner layer, since the inner liner layer deforms along with deformation of the carcass layer, there is the problem of an increase of the rolling resistance. Therefore, in general, a rubber sheet called a "tie rubber" having a small hysteresis loss has been inserted between the inner liner layer (for example, halogenated butyl rubber) and rubber of the inner surface of the carcass layer when joining the two. Accordingly, in addition to the thickness of the inner liner layer of the halogenated butyl rubber, the thickness of the tie rubber is added and the layer overall becomes a thickness of over 1 mm (i.e., 1,000 .mu.m). As a result, this has become a factor increasing the weight of the final tire.
Techniques have been proposed for using various materials in place of the butyl rubber or other low air permeability rubber as the inner liner layer of a pneumatic tire. For example, Japanese Examined Patent Publication (Kokoku) No. 47-31761 discloses to coat the inner surface of a vulcanized tire with, at a thickness of not more than 0.1 mm, a solution or dispersion of a synthetic resin such as a polyvinylidene chloride, saturated polyester resin, or polyamide resin having an air permeation not more than 10.times.10.sup.-13 at 30.degree. C. and not more than 50.times.10.sup.-13 at 70.degree. C.
Japanese Unexamined Patent Publication (Kokai) No. 5-330307 discloses to halogenate the inner surface of the tire (using a conventionally known chlorination solution, bromine solution, or iodine solution) and form, on the top thereof, a polymer film (the thickness=10 to 200 .mu.m) of methoxymethylated nylon, copolymer nylon, a blend of polyurethane and polyvinylidene chloride, or a blend of polyurethane and polyvinylidene fluoride.
Further, Japanese Unexamined Patent Publication (Kokai) No. 5-318618 discloses a pneumatic tire using a thin film of methoxymethylated nylon as an inner liner. According to this technique, a solution or emulsion of methoxymethylated nylon is spread or coated on the inner surface of a green tire, then the tire is vulcanized or a solution or emulsion of methoxymethylated nylon is spread or coated on the inner surface of the tire after vulcanization so as to produce the pneumatic tire.
Further, Japanese Unexamined Patent Publication (Kokai) No. 6-40207 is an example of using as an air permeation preventive layer composed of a tire a multilayer film having a low air permeability layer comprised of a polyvinylidene chloride film or ethylene-vinyl alcohol copolymer film and an adhesive layer comprised of a polyolefin film, aliphatic polyamide film, or polyurethane film. In this example, it is proposed to laminate the low air permeability layer and the adhesive layer to form a thin film and to laminate that thin film on the inner surface of a green tire comprised of unvulcanized rubber so that the adhesive layer contacts the carcass layer, then vulcanize and mold the green tire so as to provide an air permeation preventive layer on the inside of the tire. By using this multilayer film as the air permeation pre
REFERENCES:
patent: 4776909 (1988-10-01), Bohm et al.
patent: 5738158 (1998-04-01), Ozawa et al.
Form PCT/ISA/210 for PCT/JP96/00736.
Kaido Hiroyuki
Watanabe Jiro
Yamakawa Kazuto
Johnstone Adrienne C.
The Yokohama Rubber Co. Ltd.
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