JP2005178638A - Color seals for tires and pneumatic tires - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire color seal that displays display information in a clear color and does not peel, drop off or discolor during use, and a pneumatic tire using the same.
SOLUTION: A display layer 2 in which display information 4 is displayed in color, and an adhesive layer 3 in which the display layer 2 is laminated and vulcanized and bonded to the outer surface of a tire are formed, and the adhesive layer 3 is included in 100 parts by weight of a rubber component. The rubber composition comprises 30-50 parts by weight of at least one of natural rubber and polyisoprene rubber and 50-70 parts by weight of halogenated butyl rubber, and the rubber component comprises 70% by weight or more of the rubber composition. Color seal 1 for tires.
[Selection] Figure 4

Description

  TECHNICAL FIELD The present invention relates to a tire color seal in which various display information is displayed in a color other than black, and more particularly to a tire color seal that is used in a side portion of a pneumatic tire and prevents discoloration of the information display portion, and this The present invention relates to a pneumatic tire using a seal.

  Conventionally, various designs such as pictures, characters, symbols, photos, patterns, etc. are displayed on the tire side as information that can be visually recognized to improve the design value of the side and recognize and identify the tire information. Things have been done.

  When such information is displayed on a tire, it is generally performed to mark the tire. However, the display information stamped on the tire surface requires a mold with a mold for each pattern, lacks versatility, and the mold manufacturing cost becomes enormous, which contributes to an increase in tire manufacturing cost.

  In view of this, it has been proposed to use a display label capable of recognizing information content semipermanently while preventing peeling and dropping and preventing discoloration in place of the above-mentioned engraving (Patent Document 1).

According to the technique described in Patent Document 1, since the display label is separate from the tire, versatility can be given to the mold during vulcanization, and the display label can be deformed following the deformation of the tire. Does not cause peeling or dropping. In addition, by providing at least one of an ultraviolet suppression layer or an anti-aging agent suppression layer to suppress discoloration due to an anti-aging agent that is exposed to ultraviolet rays or migrates from a tire, in particular, by providing an ultraviolet suppression layer and an anti-aging agent suppression layer It has the effect of suppressing the increase in the degree of discoloration due to the reaction between ultraviolet rays and the antioxidant. For this reason, it is allowed to make the color inconspicuous even if the color is changed in advance.
Japanese Patent Laid-Open No. 10-2222069

  By the way, the display information displayed on the tire side part is displayed in white, red, yellow, blue, or the like according to market needs such as customer satisfaction by improving design value, tire recognition and identification accuracy. It is required to display in a clear color other than black of the tire body such as gold or silver.

  However, the display information displayed in this vivid color causes a slight discoloration even when the anti-aging agent is transferred from the tire alone. The design value of tire parts and the recognition and identification accuracy of tires may be reduced, resulting in a decrease in customer satisfaction and a market failure.

  Therefore, the present invention provides a tire color seal that clearly displays display information in a color other than black and does not peel, drop off, or discolor during use, and a tire side that is vulcanized and bonded using the tire color seal. It is an object of the present invention to provide a pneumatic tire capable of satisfying the requirements of customer satisfaction and market needs by improving the design value of tires, tire recognition and identification accuracy.

  The invention of claim 1 is a tire color seal for displaying display information on a tire, and a display layer in which display information is displayed in color, and an adhesive layer in which the display layer is laminated and vulcanized and bonded to the outer surface of the tire The adhesive layer contains 30 to 50 parts by weight of at least one of natural rubber and polyisoprene rubber and 50 to 70 parts by weight of halogenated butyl rubber in 100 parts by weight of the rubber component, A tire color seal comprising a rubber composition occupying 70% by weight or more of the rubber composition.

  According to the first aspect of the present invention, the adhesive layer made of the rubber composition enables vulcanization adhesion between the tire color seal and the tire, and the natural rubber-based rubber component strengthens the adhesiveness so that the color seal is peeled off or dropped off. And prevents the transition of the halogenated butyl rubber component to the display layer of the pollutant compound mainly composed of an anti-aging agent compounded in the tire rubber, and the display information displayed in a particularly vivid color Discoloration can be prevented. In addition, as display information, various designs composed of at least one of designs, characters, symbols, photographs, patterns, etc. are formed in clear colors and displayed by means such as sheet-like display layers, printing, transfer, etc. Is used.

  The invention according to claim 2 is the tire color seal according to claim 1, wherein an ultraviolet prevention layer for suppressing ultraviolet rays incident on the display layer is provided on the outer surface side of the display layer. It prevents ultraviolet light from entering the layer, prevents discoloration of the display layer due to ultraviolet light, and suppresses an increase in discoloration due to the reaction between the two even if the anti-aging agent is transferred.

  A third aspect of the present invention is a pneumatic tire, wherein the tire color seal according to the first or second aspect is affixed to a tire outer surface and vulcanized and bonded.

  According to the invention of claim 3, the display information is displayed in color on the outer surface of the tire, particularly on the tire side portion that is easy to recognize visually, so that the decorative display composed of a clear color is the design value of the tire and It is a pneumatic tire that improves tire recognition and identification accuracy, prevents peeling and dropping during use and enables clear display information over a long period of time, and uses a general-purpose mold to make information display tires inexpensive Can be provided.

  According to the tire color seal of the present invention, the discoloration of the display layer, which is prevented from shifting to the display layer of the contaminating compound mainly composed of the anti-aging agent blended in the tire rubber material and displayed in a clear color color Pneumatic tires that can be used for a long period of time, improving the design value of the tire side, tire recognition and identification accuracy by preventing detachment and dropping due to strong vulcanization adhesion to the tire It can be provided at low cost.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  A tire color sticker (hereinafter referred to as a color sticker) 1 according to the present invention is a color sticker that displays display information 4 on a tire side portion 5 or the like. As shown in FIG. A display layer 2 for displaying display information 4 displayed in a clear color such as white, yellow, red, gold, or the like and displayed as a logo or a mark such as “TIRE”, and a tire in which the display layer 2 is arranged and laminated And an adhesive layer 3 made of a rubber composition capable of vulcanization adhesion.

  The display layer 2 can be made of a rubber-based material such as natural rubber or synthetic rubber, or a resin-based material such as urethane or acrylic as a base material. For example, a rubber component such as natural rubber or a rubber such as a pigment and a crosslinking agent. A mixture prepared by mixing and forming a sheet, a sheet printed by applying ink onto the adhesive layer 3, and a film formed by placing a heat sublimation ink on the adhesive layer 3 by thermal transfer. The form of the display layer 2 is not particularly limited. However, from the viewpoint of adhesiveness of the adhesive layer 3 to the rubber composition, the rubber material is preferably blended with a pigment or the like.

  The display layer 2 includes tires such as white, red, yellow, blue, gold, silver, etc., where the display information 4 is composed of various patterns composed of at least one of patterns, characters, symbols, photographs, patterns, barcodes, and the like. It is composed of a clear color that is clearly displayed with respect to the black color of the main body, and is arranged and laminated on the adhesive layer 3. The display information 4 may be a single color or a combination of two or more colors.

  As shown in FIG. 1, the thickness of the display layer 2 is generally about 5 to 100 μm, preferably about 10 to 50 μm, although it depends on the constituent material of the display layer 2 and the material and thickness of the adhesive layer 3. Composed. If it is thinner than this range, the thickness becomes uneven, and part of the display information is lost or easily peeled off. On the other hand, if it is thicker than this, a step is formed between the display layer 2 and the adhesive layer 3 or it becomes easy to peel off.

  The adhesive layer 3 vulcanizes and adheres the color seal 1 to the outer surface of the tire on the tire side portion, and also transfers the contamination compound mainly composed of an anti-aging agent that bleeds from the rubber composition of the tire to the display layer 2. It has an anti-migration function such as an anti-aging agent that prevents and prevents discoloration of the display layer 2.

  The adhesive layer 3 is made of a rubber composition so that the color seal 1 is attached to the outer surface of the tire and vulcanized and bonded, and 30 to 50 parts by weight of at least one of natural rubber and polyisoprene rubber in 100 parts by weight of the rubber component. And a rubber composition containing 50 to 70 parts by weight of halogenated butyl rubber.

  When the blending amount of the natural rubber and the polyisoprene rubber is less than 30 parts by weight, sufficient adhesion to the rubber member of the tire side portion constituted by a blend system of natural rubber / diene compatible rubber cannot be obtained. If it exceeds the parts by weight, the blending ratio of the halogenated butyl rubber will decrease and the discoloration resistance will decrease.

  A part of the natural rubber-based rubber may be replaced with another diene rubber such as styrene-butadiene rubber or butadiene rubber. However, in consideration of vulcanization adhesiveness with the adherend layer, the blending amount is 20 It is preferable to be not more than parts by weight.

  Since the halogenated butyl rubber exhibits an extremely low air permeability, it is excellent in the permeation-preventing property of a compound contained in a rubber composition such as an anti-aging agent. It is possible to block the bleeding anti-aging agent and the like from moving to the display layer 2, thereby preventing discoloration of the display layer 2 due to a contaminating compound such as an anti-aging agent.

  As the halogenated butyl rubber, brominated butyl rubber and chlorinated butyl rubber can be used. Anti-permeability properties such as anti-aging agents show almost the same effect, but chlorinated butyl rubber is a production process because it has good processability such as kneading and rolling processes, and it is easy to maintain processability with proper scorch time. It is preferable from the above viewpoint.

  Halogenated butyl rubber is blended in the range of 50 to 70 parts by weight, and if it is less than 50 parts by weight, the anti-aging effect is not sufficiently exhibited and the discoloration resistance is inferior. The blending ratio is reduced and the adhesion to the tire is deteriorated.

  Further, the total of the rubber components composed of the natural rubber-based rubber and the halogenated butyl rubber preferably occupies 70% by weight or more of the rubber composition. When the total amount is less than 70% by weight, Compounding ingredients other than rubber such as carbon black and oil will increase, and even if the blending ratio of natural rubber rubber and halogenated butyl rubber is satisfied, co-crosslinking with tire side rubber will be reduced and adhesion will be improved. It becomes insufficient, and the solvent resistance is lowered, and the color seal is easily peeled off and dropped off.

  Further, the rubber composition constituting the adhesive layer 3 preferably has at least equal or greater elongation than the rubber material such as the tire side portion 5 to which the color seal 1 is vulcanized and bonded. Even if the side portion 5 is deformed, the collar seal 1 extends corresponding to this deformation, and the shearing force at the adhesive interface with the side portion 5 can be sufficiently reduced, and peeling and dropping can be prevented. This elongation can be ensured by adjusting the compounding components of the adhesive layer 3.

  The thickness of the adhesive layer 3 varies depending on the tire size and the internal structure of the side portion, and is not limited to a specific one. However, the thickness of the adhesive layer 3 is not vulcanized and embedded in the surface of the side rubber and does not contact the carcass layer 51. It is preferable to maintain an interval that is not affected by such distortion, and is about 1/10 to 1/2 of the thickness of the side rubber on the outside of the carcass layer, and is appropriately designed and used depending on the tire used.

  The rubber composition constituting the adhesive layer 3 includes, in addition to the above rubber components, reinforcing agents and fillers such as carbon black and silica used in normal rubber industry, process oil, zinc white, stearic acid, softening Compounding chemicals such as an agent, a plasticizer, an anti-aging agent, a vulcanizing agent, and a vulcanization accelerator are appropriately mixed and used within a normal range. In particular, when the product body such as a tire is made of a black rubber composition, the adhesive layer 3 is assimilated with the tire body by blackening the adhesive layer 3 as a carbon black compound, and the color color of the display information is clearly highlighted. Can do.

  The color seal 1 is affixed to the inner surface of the mold 6 by vulcanization pressure as shown in FIG. 2 by being affixed to the outer surface of the tire side portion 5 of the unvulcanized tire and then vulcanized in the vulcanization mold. Then, the color seal 1 is vulcanized and bonded in an embedded state in the side rubber 5 to obtain a pneumatic tire T in which the surface of the side portion 5 of the tire T and the color seal 1 are flush with each other as shown in FIG. .

  As shown in FIG. 4, this pneumatic tire T displays the display information 4 of the display layer 2 in a clear color so that the information can be recognized visually, and the decorative effect of the tire side portion 5 is emphasized. Value will be improved, and tire recognition and identification accuracy will be improved.

  In addition, the color seal 1 may be attached to the tire side portion 5 as described above and then vulcanized into the mold. However, the color seal 1 is placed at a predetermined position on the inner surface of the mold 6 and the tire side is formed inside the mold 6. It can also be attached to the part 5 and vulcanized and bonded.

  As this display information 4, various characters and designs such as tire manufacturer and shipping destination names and logo marks, tire rotation direction marks and tire product name characters shown in FIG. 4, and the adhesive layer 3 are used. The display information 4 is assimilated to the black color of the side portion and is clearly displayed with the black background. The display information 4 may be a single color, or two or more colors may be used. For example, the color of the arrow of the mark 4 indicating the rotation direction in FIG. 4 may be changed in the order of white, yellow, blue, etc. Good.

  Further, even if the pneumatic tire T undergoes a large deformation at the side portion, the color seal 1 is deformed following the deformation of the side portion, preventing the color seal 1 in use from being peeled off or dropped off for a long time. To provide a pneumatic tire that can be used and manufactured without using a specific mold with a conventional stamping method, and that improves tire recognition and identification accuracy at a low cost. Can do.

(Modification)
Furthermore, in addition to the color seal 1 constituted by the display layer 2 and the adhesive layer 3, the color seal of the present invention is provided with an ultraviolet ray prevention layer 7 on the outer surface side of the display layer 2 as shown in FIG. A color seal 11 can also be used. Thereby, the display layer 2 is prevented from being discolored by blocking the incidence of the ultraviolet rays on the display layer 2, and in the unlikely event that the anti-aging agent is transferred to the display layer 2, the discoloration due to the reaction between the two. The increase in the degree is suppressed. In this case, the ultraviolet ray preventing layer 7 needs to be formed of a colorless and transparent layer for visually recognizing the clear display content of the display layer 2.

  In the above embodiment, an example in which the color seal is vulcanized and bonded to the tire side portion has been shown, but it can also be used as tire recognition and identification information on the tread portion and bead portion, and for rubber products other than tires. Can also be applied.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited by this.

Table 1 shows the blending components and blending amounts (parts by weight) of the display layer composition used in Examples having a red color based on a rubber material.

  Table 2 shows the rubber compositions used for the adhesive layers of the examples and comparative examples. Each rubber composition was prepared by blending according to the blending components and blending amounts (parts by weight) shown in Table 2 and kneading using a normal 20 liter Banbury mixer.

  Each rubber composition obtained is sheeted to a thickness of 1 mm, and a two-layer evaluation color in which a display layer having a thickness of 15 μm obtained by sheeting the composition shown in Table 1 on the sheet surface of each rubber composition is laminated. A seal (30 × 60 mm) was produced.

  Each evaluation color seal is affixed to a predetermined position of the sidewall portion of the unvulcanized tire, and vulcanized according to a conventional method to produce a test pneumatic radial tire (size 185 / 70R14). Solvent resistance and peel resistance were carried out according to the following test methods. The results are shown in Table 2. The sidewall rubber is a natural rubber / butadiene rubber-based blend, and 3.0 parts by weight of the anti-aging agent 6C is blended.

Each rubber component and compounding chemicals listed in Table 2 are as follows.
・ Natural rubber (NR): RSS # 3
・ Polyisoprene rubber (IR): JSR, IR2200
-Brominated butyl rubber (Br-IIR): manufactured by Exxon, BROMOBUTYL2255
・ Chlorinated butyl rubber (Cl-IIR): manufactured by Exxon, CHLOROBUTYL1066
・ Carbon black (GPF): Toast carbon, Seast V
・ Paraffin oil: JOMO Process P200 manufactured by Japan Energy
・ Stearic acid: Kao Soap, LUNAC S-20
・ Anti-aging agent: Nouchi SP, manufactured by Ouchi Shinsei Chemical
・ Wax: Nippon Seiwa, OZOACE0355
・ Vulcanization accelerator: Sumitomo Chemical, Soxinol DM
-Zinc flower ... Mitsui Mining & Mining Co., Ltd., Zinc flower No. 1 / Sulfur ... Tsurumi Chemical Co., powdered sulfur The rubber component content (%) shown in Table 2 is a calculated value from the amount of each component.

[Discoloration test]
Each test tire was attached to an outdoor exposure table with the side wall portion on the surface side, and directly exposed to the outdoors for 1 week to observe the discoloration of the display layer of the color seal. Table 2 shows the case where the occurrence of discoloration was observed compared to when it was new.

[Solvent resistance test]
The surface of the color seal portion of each test tire was evaluated by the presence or absence of peeling of the color seal when the surface of the color seal portion was wiped off with a rubber volatile material (assuming the case where a tire beautifying agent was used). Table 2 shows the case where the color seal was partially peeled off, x, and the case where it was not peeled off.

[Peeling durability test]
Each test tire was mounted on a front-wheel drive type passenger car having a displacement of 2000 cc, and evaluation was performed based on whether or not the color seal was lifted and peeled after traveling on a general road for 1,000 km. Table 2 shows the case where the color seal partially floated and peeled off, and the case where there was no floating and peeled off.

  As is clear from the results shown in the table, the pneumatic tires of Embodiments 1 to 4 using the color seal according to the present invention on the side part are formed by an adhesive layer that is impervious to contaminating compounds such as anti-aging agents. Prevents the transition to the display layer, keeps the display layer red and has good solvent resistance and peeling resistance, and is excellent in adhesion to the side rubber and the ability to follow the deformation of the side part. And the color display displayed on the sidewall can be kept clear over a long period of time.

  As described above, the color seal of the present invention improves the design value of the tire side part, the tire recognition and the identification accuracy by display information displayed in a clear color, and enables its long-term use. The bead portion can also be used as tire recognition and identification information. Of course, this color seal can also be used for rubber products other than tires.

It is a perspective view of the color seal of an embodiment. It is the schematic at the time of tire vulcanization of the side part which stuck the color seal. It is sectional drawing of a tire side part. It is a side view of a tire side part. It is sectional drawing of a modification color seal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Color seal 2 ... Display layer 3 ... Adhesive layer 4 ... Display information 5 ... Tire side part 6 ... Mold T ... Tire

Claims (3)

A tire color seal for displaying display information on a tire,
It is composed of a display layer in which display information is displayed in color, and an adhesive layer that laminates the display layer and vulcanizes and adheres to the outer surface of the tire.
The adhesive layer contains 30 to 50 parts by weight of at least one of natural rubber and polyisoprene rubber and 50 to 70 parts by weight of halogenated butyl rubber in 100 parts by weight of the rubber component, and the rubber component is contained in the rubber composition. A tire color seal comprising a rubber composition occupying 70% by weight or more. 2. The tire color seal according to claim 1, wherein an ultraviolet prevention layer for suppressing ultraviolet rays incident on the display layer is provided on an outer surface side of the display layer. A pneumatic tire, wherein the tire color seal according to claim 1 is affixed to a tire outer surface and is vulcanized and bonded.

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