JPS5975808A - Tire with colored side display - Google Patents

Abstract

PURPOSE:To provide diversified decoration by embedding coloring materials whose chief ingredient may be modified liquid rubber, thermoplastic diene elastomer, or thermoplastic polyurethane, in a recessed part provided on a side wall of a pneumatic tire. CONSTITUTION:Colored side display can be provided by grooving a part of a side wall of a tire, covering the grooved part with a cover 3 such as a metal mold, etc. being closely brought in contact with the part and, then, injecting at a normal pressure or under pressure, a liquid type coloring material whose chief ingredient may be modified liquid rubber, thermoplastic diene elastomer, or thermoplastic polyurethane, and molding. Although the colored side display is characterized by being provided on the recessed parts of the side wall, the surface of the colored side display 2 needs not necessarily be aligned with the surface of the side wall 1, and the surface of the display may be recessed, and the display is more difficult to be exfoliated when the recess is wider in its inner part.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tire with a color side display, and more particularly to a pneumatic tire having a color side display on the sidewall that significantly enhances the decorativeness of the tire and is highly durable.

As automobiles gradually become more decorative, there has been a demand for color decoration for tires as well, but a highly durable color side display that allows decoration to match the individuality of the user has not yet been obtained. is the current situation.

For example, when molding a green tire, a white rubber block is buried in the tire body, and after vulcanization, it is re-glued to form letters or lines on the sidewall of the tire. However, this method requires a lot of time and effort to manufacture the tires, and the manufacturing costs are also high.In addition, only a uniform decoration can be obtained and it is difficult to meet the diversifying demands of the users. was impossible.

Various tire seals have been developed to improve this drawback. For example, JP-A-49-1TS, LA+
-s publication discloses a sticker in which a colored vulcanized rubber sheet is cut into an arbitrary shape and pasted on a tire with adhesive, and JP-A-56-90.704 discloses a sticker that is made of a soft A white letter protective film for tires has been disclosed, which is made by coating one side of a plastic film with a removable adhesive.6 However, these tire stickers are simply pasted on the tire, and do not protrude as a convex portion from the tire surface. Because of this, it has the disadvantage that it easily peels off due to friction such as when brushing tires during car washes.

As a result of intensive studies to solve the following problems, the inventors of the present invention were able to arrive at a color side display for tires that allows for a wide variety of decorations and is highly durable.

The present invention provides a color side display tire characterized in that a recess provided in a sidewall portion of a tire that is exposed to nitrogen air is filled with a coloring material containing a modified liquid rubber, a thermoplastic diene elastomer, or a thermoplastic polyurethane as a main component. It is.

Here, as the modifying group of the modified liquid rubber, a carboxyl group, a hydroxyl group, an amide group, or an aldehyde group, singly or in combination, is usually used, but the modifying group is not limited to these. For example, in carboxy-modified polybutadiene rubber, the molecular weight is 5,000 to 50,00 as the weight average molecule ψM in order to have fluidity and obtain appropriate physical properties.
0 is preferable, and 1 to 10,000 to ao, ooo
is even more preferable. These modified liquid rubbers are cured in their original shape when forming color side displays.

The thermoplastic resin elastomer may be anything that has fluidity as a polymer itself or a polymer composition at 100°C or higher and has elasticity similar to that of side rubber at room temperature to 80°C, such as various known types. Block copolymers are used.

Any block copolymer may be used as long as it can have various elastic properties by changing the component ratio of the aggregated phase, but it is usually a styrene-butadiene block copolymer or a styrene-isoprene block copolymer. , a styrene-butadiene-isoprene block terpolymer or a styrene-butadiene-urea block terpolymer.

The above thermoplastic diene elastomer or its composition may be treated with a suitable vulcanizing agent, such as sulfur, 4,4'-dithiobisudimorpholine or peroxides, and in the case of sulfur vulcanization, ditheocabamates, if necessary. A vulcanization accelerator such as a xanthate, a thiuram, a thiazole, a sulfenamide, a guanidine, or a thiourea may be added, and the composition may be used as a natural vulcanization or heat-pressure vulcanization type composition.

Examples of thermoplastic polyurethanes include incompletely thermoplastic polyurethanes (partially crosslinked type) such as Tex1n manufactured by Sumitomo Bayer Urethane Co., Ltd., and fully thermoplastic polyurethanes (linear structure) such as Parabrene manufactured by Nippon Polyurethane Co., Ltd. Any of these can be suitably used.

Further, as for the coloring of the coloring material, it is preferable to use a color having decorative saturation, but it does not necessarily have to have saturation, and may be a color having only lightness such as white or gray, which is different from the black background of the tire.

The color side display of the present invention is made by grouping a part of the sidewall part l of the tire as shown in Fig. m1, closely covering it with a cover 8 made of a mold, etc., and then applying liquid coloring material under normal pressure or It can be injected and molded under pressure.

The color side display of the present invention is characterized in that it is provided in a recessed part of the sidewall part, but the surface of the color side display part 2 and the surface of the sidewall part l do not necessarily coincide as shown in FIG. 2 (1). There is no need to do this, tJ, Figure 2 (
The surface of the color side display section 2 may be depressed as shown in bl, or may be protruded as shown in FIG. 2(C).

Moreover, it is more preferable that the four parts provided on the sidewall part of the tire are spread out inside the tire as shown in FIGS.

The inner part of the tire in the color side display section 2 is shown in Figure 2(e).
It may be chamfered as shown in ~(g).

The protruding portion of the tire surface of the collar and side display portion 2 may partially protrude above the recess as shown in Fig. 2 (f), or it may be aligned at the edge as shown in Fig. 2 (g). It may also cover the surface of the tire.

The color side display of the present invention is a straight line H-H passing through the height of the rim flange of the tire and parallel to the tire rotation axis as shown in Figure 1.
It may be applied to any part of the sidewall part 1 that reaches the tire tread surface, but as shown in Figure 8, it is parallel to the axis of rotation of the tire at the height of the tire's maximum width from the line H-H of the rim flange height. It is preferable to provide the tire in the part a between the straight line w and 'w drawn in the tire because the strain in the circumferential direction of the tire is smaller and the tire is less likely to peel off. The middle portion a2 of the eight equal parts divided by the straight lines L□-L□, L, -L is the most preferable because both the circumferential strain and the radial strain of the tire are small, making it more difficult to peel off.

The thickness of the color side display section 2 is within the groupable range 0.
．． The amount may be from 5 to 8 rrm, preferably about 1 rrm.

The present invention will be explained in more detail below with reference to Examples.

Examples 1 to 5, Comparative Example 1 A make-up coloring material was prepared according to the formulation of 5tfI@ shown in Table 1, and a concave shape as shown in FIG. Width 1OIII.

As shown in FIG. 1, the tires I grouped in a line at a depth of 1 mm were brought into close contact with each other under pressure using a metal cover 8, and then a filler coloring material was injected under pressure to form a color side display.

Also, for comparison, the thickness l w, m in the formulation of Comparative Example 1
A vulcanized rubber sheet was prepared and, in the same manner as in Example 40, was adhered to part aQ of the sidewall in FIG. 4 along the width loam and seven lines around the circumference using a thermoplastic polyurethane adhesive to obtain a comparative tire.

The tires used were radial tires for passenger cars of size 1755R14 in both Examples and Comparative Examples.

These six types of tires were installed on 10 vehicles with an average daily mileage of 250 - to compare the example tire and the comparative example tire (example tire: left front and rear wheels, comparative example T-V: right front and rear wheels). A running test was carried out for 60 days using two types of actual tires: a combination of 11 front and rear wheels on the right side and a comparative tire on the left front and rear wheels. All vehicles were washed every day after driving, and all tires were brushed and cleaned.

After the running test was completed, the Comparative Tires had peeling in some or most parts of the entire tire, and had a very unsightly appearance, but the Example Tires had no peeling and had a good appearance. .

As described above, the color side display of the present invention is characterized in that it compensates for the recess pressure provided in the sidewall portion of a pneumatic tire, the coloring material whose main component is modified liquid rubber, thermoplastic diene elastomer, or thermoplastic polyurethane. Unlike conventional methods, the tire can easily provide a color side display of the tire that allows for a wide variety of decorations and is highly durable.

[Brief explanation of the drawing]

Figure 1 is a left half cross-sectional view of a pneumatic tire showing an embodiment of the color side display of the present invention, Figures 2a-g are partial cross-sectional views of the vicinity of the color side display showing various embodiments of the present invention, Figures 8, g, and 4 are left half sectional views of a pneumatic tire showing the position of a sidewall portion suitable for providing color side display. 1...Side wall part, 2...Color side display part, 8...Cover, H-1
-1...A straight line passing through the rim flange height and parallel to the tire rotation axis. W-W...A straight line parallel to the tire rotation axis at the height of the tire at its maximum width.

Claims (1)

[Claims] L. A color side display tire characterized in that a recess provided in a sidewall portion of a pneumatic tire is filled with a colored material containing modified liquid rubber, thermoplastic diene elastomer, or thermoplastic polyurethane as a main component.