JPH01297307A - Pneumatic tyre - Google Patents
Pneumatic tyreInfo
- Publication number
- JPH01297307A JPH01297307A JP63128984A JP12898488A JPH01297307A JP H01297307 A JPH01297307 A JP H01297307A JP 63128984 A JP63128984 A JP 63128984A JP 12898488 A JP12898488 A JP 12898488A JP H01297307 A JPH01297307 A JP H01297307A
- Authority
- JP
- Japan
- Prior art keywords
- rubber
- weight
- parts
- group
- sidewall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 229920001971 elastomer Polymers 0.000 claims abstract description 143
- 239000005060 rubber Substances 0.000 claims abstract description 143
- 239000000203 mixture Substances 0.000 claims abstract description 54
- 229920002943 EPDM rubber Polymers 0.000 claims abstract description 8
- 239000005062 Polybutadiene Substances 0.000 claims abstract description 6
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 6
- 244000043261 Hevea brasiliensis Species 0.000 claims abstract description 5
- 229920003049 isoprene rubber Polymers 0.000 claims abstract description 5
- 229920003052 natural elastomer Polymers 0.000 claims abstract description 5
- 229920001194 natural rubber Polymers 0.000 claims abstract description 5
- 229920003048 styrene butadiene rubber Polymers 0.000 claims abstract description 5
- 229920005557 bromobutyl Polymers 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 229920005555 halobutyl Polymers 0.000 claims description 3
- 241000894007 species Species 0.000 claims 1
- 238000002845 discoloration Methods 0.000 abstract description 12
- 229920005549 butyl rubber Polymers 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 150000004820 halides Chemical class 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 55
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 17
- 239000003795 chemical substances by application Substances 0.000 description 10
- 238000004073 vulcanization Methods 0.000 description 7
- 238000005336 cracking Methods 0.000 description 5
- 229920003244 diene elastomer Polymers 0.000 description 5
- 230000003712 anti-aging effect Effects 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 150000001412 amines Chemical class 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- MHKLKWCYGIBEQF-UHFFFAOYSA-N 4-(1,3-benzothiazol-2-ylsulfanyl)morpholine Chemical compound C1COCCN1SC1=NC2=CC=CC=C2S1 MHKLKWCYGIBEQF-UHFFFAOYSA-N 0.000 description 1
- 235000021355 Stearic acid Nutrition 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 229920005556 chlorobutyl Polymers 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229910021385 hard carbon Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 229940032017 n-oxydiethylene-2-benzothiazole sulfenamide Drugs 0.000 description 1
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 1
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
- 239000008117 stearic acid Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 235000014692 zinc oxide Nutrition 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
[産業上の利用分野]
本願発明は、空気入りタイヤに関し、詳しくはカーカス
の側面を被覆保護するサイドウオールが、ゴム組成の異
なる内外2層で構成された空気入りタイヤに関する。Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a pneumatic tire, and more specifically to a pneumatic tire in which a sidewall that covers and protects the side surface of a carcass is composed of two layers, an inner and outer layer having different rubber compositions. Regarding.
[従来の技術]
空気入りタイヤのサイドウオールは、主鎖中の二重結合
の含有率の高い天然ゴム、イソプレンゴム(IR)、ブ
タジェンゴム(BR) 、スチレン・ブタジエンゴム(
SBR)などの高不飽和度ゴムの組成物で形成されてい
た。このゴム分子の主鎖の二重結合はオゾンと反応して
解重合する性質があるので、タイヤを紫外線の強い所、
或は空気中のオゾン濃度の高い雰囲気中に放置しておく
と、亀裂いわゆるオゾンクラックが発生する。これを防
ぐため、サイドウオールのゴム組成物にはアミン系の老
化防止剤、ワックスなどの抗オゾンクラック剤が配合さ
れていた。[Prior art] Sidewalls of pneumatic tires are made of natural rubber with a high content of double bonds in the main chain, isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (
It was made of a highly unsaturated rubber composition such as SBR). The double bonds in the main chain of this rubber molecule have the property of reacting with ozone and depolymerizing, so do not place the tire in a place with strong ultraviolet rays.
Alternatively, if it is left in an atmosphere with a high ozone concentration in the air, a so-called ozone crack will occur. To prevent this, sidewall rubber compositions have been blended with anti-ozone cracking agents such as amine anti-aging agents and wax.
しかしながら、このような抗オゾンクラック剤を添加し
たゴム組成物で構成したサイドウオールを有する空気入
りタイヤにおいては、保管中に抗オゾンクラック剤がサ
イドウオールの表面にブルームして、あたかも埃が付着
したような外見を呈する。更に、アミン系老化防止剤は
、空気や日光に曝らされると褐色に変色する性質がある
ので、ブルームによりサイドウオールの表面に形成され
た抗オゾンクラック剤の薄層は褐色になり、タイヤ本来
の黒色を隠蔽して美観を損じ、商品価値を低下させてい
た。However, in pneumatic tires that have sidewalls made of rubber compositions containing such anti-ozone cracking agents, the anti-ozone cracking agents bloom on the surface of the sidewalls during storage, causing dust to adhere to the tires. exhibits the appearance of Furthermore, amine anti-aging agents have the property of turning brown when exposed to air or sunlight, so the thin layer of anti-ozone cracking agent formed on the surface of the sidewall due to bloom turns brown, causing the tire to deteriorate. The original black color was hidden, spoiling the aesthetic appearance and lowering the product value.
そこで、不飽和結合の含有量の少ない低不飽和度ゴムを
使用して、ゴム成分自体の耐オゾン性を高め、ブルーム
、変色の原因となる抗オゾン剤含有量を減量したゴム組
成物でサイドウオールを構成する検討がされた(例えば
、特開昭55−80448号、特開昭59−14502
号、特開昭82−143955号)。Therefore, we use a low-unsaturation rubber with a low content of unsaturated bonds to increase the ozone resistance of the rubber component itself, and use a rubber composition with a reduced content of anti-ozone agents that cause blooming and discoloration. Consideration was made to construct a wall (for example, Japanese Patent Application Laid-Open No. 55-80448, Japanese Patent Application Laid-open No. 59-14502).
No., JP-A-82-143955).
[発明が解決しようとする課題]
しかしながら、低不飽和度ゴムは、カーカスやトレッド
に通常使用されるジエン系ゴム(高不飽和度ゴム)より
加硫反応性が遅い。そのため、加硫促進剤を調整して両
者の加硫速度を合致させても、両者の界面では加硫促進
剤の移行により局部的に加硫速度が速くなり、両者のゴ
ムが相互に拡散する期間が短かくなるので、接着性が悪
い。このような問題は、特開昭59−14502号に示
すように、サイドウオールを内外2層構造とし、低不飽
和度ゴムを大量に配合したゴム組成物で外層を構成し、
ジエン系ゴムで内層を構成しても解決されず、低不飽和
度ゴムをサイドウオールに用いた空気入りタイヤは実用
に供されていなかった。[Problems to be Solved by the Invention] However, low unsaturation rubbers have slower vulcanization reactivity than diene rubbers (high unsaturation rubbers) commonly used for carcass and treads. Therefore, even if the vulcanization accelerator is adjusted to match the vulcanization rate of both, the vulcanization rate will locally increase due to migration of the vulcanization accelerator at the interface between the two, and the two rubbers will diffuse into each other. Since the period is short, the adhesion is poor. To solve this problem, as shown in Japanese Patent Application Laid-Open No. 59-14502, the sidewall has a two-layer structure, an inner and outer layer, and the outer layer is made of a rubber composition containing a large amount of low-unsaturation rubber.
Composing the inner layer with diene rubber did not solve the problem, and pneumatic tires using low-unsaturation rubber for the sidewalls had not been put into practical use.
本発明は、上記問題点を解決し、低不飽和度ゴムを用い
ながら、ジエン系ゴム組成物で構成されたカーカス等と
の接着性に優れたサイドウオールを有する空気入りタイ
ヤを提供することを目的としている。The present invention solves the above problems and provides a pneumatic tire that uses a low unsaturation rubber and has a sidewall that is made of a diene rubber composition and has excellent adhesion to a carcass or the like. The purpose is
[課題を解決するための手段]
本発明の空気入りタイヤは、カーカス(1)の側面を被
覆保護するサイドウオール(2)が、カーカスに隣接す
る内層(3)と、その外側に配設した外層(4)の2層
構造である空気入りタイヤであって、内層(3)が、ハ
ロゲン化ブチルゴム及びエチレン・プロピレンΦジエン
ゴム(EPDM)からなる低不飽和度ゴム群の少なくと
も1種を10〜30重量部、並びに、天然ゴム、イソプ
レンゴム、ブタジェンゴム及びスチレン・ブタジエンゴ
ムからなる高不飽和度ゴム群の少なくとも1種を90〜
70重量部配合してなるゴム組成物で構成され、外層(
4)が、前記低不飽和度ゴム群の少なくとも1種を30
〜60重量部、並びに前記高不飽和度ゴム群の少なくと
も1種を70〜40重量部配合してなるゴム組成物で構
成されたことを特徴とするものである。[Means for Solving the Problems] The pneumatic tire of the present invention has a sidewall (2) that covers and protects the side surface of the carcass (1), which is disposed on the inner layer (3) adjacent to the carcass and on the outside thereof. A pneumatic tire having a two-layer structure including an outer layer (4), wherein the inner layer (3) contains at least one member of the low unsaturation rubber group consisting of halogenated butyl rubber and ethylene propylene Φ diene rubber (EPDM). 30 parts by weight, and at least one member of the highly unsaturated rubber group consisting of natural rubber, isoprene rubber, butadiene rubber, and styrene-butadiene rubber.
The outer layer (
4) contains at least one member of the low unsaturation rubber group at 30%
60 parts by weight, and 70 to 40 parts by weight of at least one of the aforementioned highly unsaturated rubbers.
また、内層(3)が、臭素化ブチルゴムを10〜30重
量部、エチレン・プロピレン・ジエンゴムを0〜20重
量部、及び前記高不飽和度ゴム群の少なくとも1種を9
0〜70重量部配合してなるゴム組成物で構成され、外
層(4)が、臭素化ブチルゴムを20〜60重量部、エ
チレン・プロピレン・ジエンゴムを10〜30重量部、
及び前記高不飽和度ゴム群の少なくとも1種を70〜4
0重量部配合してなるゴム組成物で構成されることが好
ましい。In addition, the inner layer (3) contains 10 to 30 parts by weight of brominated butyl rubber, 0 to 20 parts by weight of ethylene propylene diene rubber, and 9 parts by weight of at least one of the highly unsaturated rubber group.
The outer layer (4) is composed of a rubber composition containing 0 to 70 parts by weight of brominated butyl rubber, 20 to 60 parts by weight of brominated butyl rubber, 10 to 30 parts by weight of ethylene propylene diene rubber,
and at least one member of the group of highly unsaturated rubbers of 70 to 4
It is preferable to use a rubber composition containing 0 parts by weight.
また、ラジアル構造のカーカス(1)の側面を被覆保護
するサイドウオール(2)が、カーカス(1)に隣接す
る内層(3)と、その外側に配設した外層(4)の2層
構造になっている空気入りタイヤであって、サイドウオ
ールの上端部(6)はトレッドゴム(8)の側面に配設
され厚さが漸減しながら延びて終端し、サイドウオール
の下端部(7)は厚さが漸減しながら終端してこのサイ
ドウオールの下端部(7)にリムストリップ(9)が続
き、サイドウオール(2)の上端部(6)、主要部(5
)及び下端部(7)のそれぞれの内層は、前記低不飽和
度ゴム群の少なくとも1種を10〜30重量部及び前記
高不飽和度ゴム群の少なくとも1種を90〜70重量部
配合したゴム組成物で構成され、サイドウオール(2)
の上端部(6)、主要部(5)及び下端部り7)のそれ
ぞれの外層は、前記低不飽和度ゴム群の少なくとも1種
を30〜60重量部及び前記高不飽和度ゴム群の少なく
とも1種を70〜40重二部配合したゴム組成物で構成
されることが好ましい。In addition, the sidewall (2) that covers and protects the side surface of the carcass (1) with a radial structure has a two-layer structure consisting of an inner layer (3) adjacent to the carcass (1) and an outer layer (4) disposed outside of the inner layer (3). The upper end (6) of the sidewall is disposed on the side of the tread rubber (8) and extends while gradually decreasing in thickness until it ends, and the lower end (7) of the sidewall is disposed on the side of the tread rubber (8). The lower end (7) of this sidewall is followed by a rim strip (9) of decreasing thickness, terminating at the lower end (7) of the sidewall (2), at the upper end (6) of the sidewall (2), and at the main part (5).
) and the lower end portion (7), each of which contains 10 to 30 parts by weight of at least one of the low unsaturation rubber group and 90 to 70 parts by weight of at least one of the high unsaturation rubber group. Comprised of a rubber composition, the sidewall (2)
The outer layer of each of the upper end part (6), main part (5) and lower end part 7) contains 30 to 60 parts by weight of at least one of the low unsaturated rubber group and the high unsaturated rubber group. It is preferable to use a rubber composition containing 70 to 40 parts of at least one rubber.
[作 用]
外層を構成するゴム組成物は、低不飽和度ゴムを30〜
60重量部配合しているので、耐オゾンクラック性に優
れる。内層を構成するゴム組成物は、低不飽和度ゴムを
10〜30重量部配合しているので、外層との接着性に
劣ることなく、更に低不飽和度ゴムを15〜30重量部
にすると耐オゾンクラック性もよくなる。また、内層を
構成するゴム組成物は高不飽和度ゴムを90〜70重量
部配合しているので、高不飽和度ゴム組成物で構成され
るカーカス等との接着性に劣ることはない。すなわち、
内層は、外層とカーカスとの中間的組成で配合されたゴ
ム組成物で構成されているので、大幅な組成の変化を防
ぐ緩衝層として働き、両者との共加硫が充分行なわれ、
接着性に優れる。[Function] The rubber composition constituting the outer layer contains a low unsaturation rubber of 30 to 30%.
Since it contains 60 parts by weight, it has excellent ozone crack resistance. Since the rubber composition constituting the inner layer contains 10 to 30 parts by weight of low unsaturation rubber, the adhesion with the outer layer is not inferior, and if the low unsaturation rubber is added to 15 to 30 parts by weight, Ozone crack resistance is also improved. Furthermore, since the rubber composition constituting the inner layer contains 90 to 70 parts by weight of highly unsaturated rubber, there is no inferiority in adhesion to a carcass or the like made of the highly unsaturated rubber composition. That is,
The inner layer is composed of a rubber composition blended with a composition intermediate between that of the outer layer and the carcass, so it acts as a buffer layer to prevent drastic changes in composition, and co-vulcanization with both is sufficiently performed.
Excellent adhesion.
外層を構成するゴム組成物において、高不飽和度ゴムが
70重量部を超えて配合されると、耐オゾンクラック性
が著しく低下する。40重量部未満の配合では、高不飽
和度ゴムを主体とするゴム層と加硫反応速度に大きな差
異が生じて接着性が大幅に低下し、同時に耐屈曲疲労性
も低下する。If more than 70 parts by weight of highly unsaturated rubber is blended into the rubber composition constituting the outer layer, ozone crack resistance will be significantly reduced. If the amount is less than 40 parts by weight, there will be a large difference in the vulcanization reaction rate from the rubber layer mainly composed of highly unsaturated rubber, resulting in a significant decrease in adhesion and, at the same time, a decrease in flex fatigue resistance.
内層を構成するゴム組成物において、高不飽和度ゴムの
配合が70重量部未満では、カーカス等の高不飽和度ゴ
ムを主体とするゴム層との接着力が上記と同じ理由によ
り不足する。In the rubber composition constituting the inner layer, if the amount of highly unsaturated rubber is less than 70 parts by weight, the adhesive strength with a rubber layer mainly composed of highly unsaturated rubber such as a carcass will be insufficient for the same reason as above.
また、低不飽和度ゴムの1種であるハロゲン化ブチルゴ
ムとしては臭素化ブチルゴム、塩素化ブチルゴム等が挙
げられるが、中でも臭素化ブチルゴムを使用すると、高
不飽和度ゴムとの接着性が向上する。その際、外層を構
成するゴム組成物に臭素化ブチルゴムを60重量部を超
えて配合すると、引張り強さの低下、加工性や寸法安定
性の悪化が生じることがある。20重量部未満の配合で
は、充分な耐オゾン性や耐屈曲疲労性が得られないこと
がある。また、EPDMを30重量部を超えて配合する
と、高不飽和度ゴムを主体とするゴム層との接着性が低
下し、耐屈曲疲労性の低下も大きくなることがある。1
0重量部未満の配合では、耐オゾン性が劣ることがある
。In addition, examples of halogenated butyl rubber, which is a type of low unsaturation rubber, include brominated butyl rubber, chlorinated butyl rubber, etc. Among them, the use of brominated butyl rubber improves the adhesion with high unsaturation rubber. . At that time, if more than 60 parts by weight of brominated butyl rubber is blended into the rubber composition constituting the outer layer, a decrease in tensile strength, processability, and dimensional stability may occur. If the amount is less than 20 parts by weight, sufficient ozone resistance and bending fatigue resistance may not be obtained. Furthermore, if more than 30 parts by weight of EPDM is blended, the adhesion to the rubber layer mainly composed of highly unsaturated rubber may be reduced, and the bending fatigue resistance may also be greatly reduced. 1
If the amount is less than 0 parts by weight, ozone resistance may be poor.
また、内層を構成するゴム組成物に臭素化ブチルゴムを
30重量部を超えて配合すると、高不飽和度ゴムを主体
とするゴム層との接着性が低下することがある。EPD
Mの配合は、高不飽和度ゴムを主体とするゴム層との接
着性や耐屈曲疲労性の観点より、20重量部以下とする
のが好ましい。Furthermore, if more than 30 parts by weight of brominated butyl rubber is blended into the rubber composition constituting the inner layer, the adhesion to the rubber layer mainly composed of highly unsaturated rubber may decrease. EPD
The content of M is preferably 20 parts by weight or less from the viewpoint of adhesion to the rubber layer mainly composed of highly unsaturated rubber and bending fatigue resistance.
[実施例]
高不飽和度ゴムの一部を低不飽和度ゴムで置換えたゴム
組成物における耐オゾンクラック性の向上、及びゴム組
成物間の接着性を確認するため、第1表に示す割合(重
量部)に従って混合してゴム組成物を得、これらの耐オ
ゾン性、変色性を試験して第1表に示した。また、第2
表に示す組合せでゴム組成物間の接着力を試験し、第2
表に結果を示した。[Example] In order to confirm the improvement in ozone crack resistance in a rubber composition in which a part of the highly unsaturated rubber was replaced with a low unsaturated rubber, and the adhesion between the rubber compositions, the results shown in Table 1 were used. Rubber compositions were obtained by mixing according to the proportions (parts by weight), and their ozone resistance and discoloration properties were tested and are shown in Table 1. Also, the second
The adhesion between rubber compositions was tested using the combinations shown in the table.
The results are shown in the table.
諸物性の7111定方法を以下に述べる。The method for determining various physical properties will be described below.
a、オゾン試験(耐オゾン性および変色の評価)温度4
0℃、オゾン濃度50pphmの低濃度オゾンを含む空
気中において、クラック発生までの時間と、24時間経
過後の変色度合を測定した。変色の評価としては、明ら
かに差のわかるものを変色大、変化が多少認められるも
のを変色中、それらの中間を変色中、変化の認められな
いものを不変として評価した。a. Ozone test (evaluation of ozone resistance and discoloration) temperature 4
The time until crack generation and the degree of discoloration after 24 hours were measured at 0° C. in air containing a low ozone concentration of 50 pphm. Regarding the evaluation of discoloration, those with a clear difference were evaluated as major discoloration, those with some change were evaluated as discolored, those in between were evaluated as discolored, and those with no change were evaluated as unchanged.
b、接着試験(ゴム−ゴム間接着性評価)有機繊維で裏
打ちしたゴムシートをゴム−ゴム間剥離ができるように
重ねて成形した試料を、プランジャータイプの金型で1
60℃×20分加硫したものを、幅1cmに切断した後
、ゴム−ゴム間の接着力を測定した。b. Adhesion test (rubber-rubber adhesion evaluation) A sample made by stacking rubber sheets lined with organic fibers and molding them so that the rubber-rubber peeling is possible was molded using a plunger type mold.
After vulcanizing at 60° C. for 20 minutes and cutting into 1 cm wide pieces, the rubber-to-rubber adhesive strength was measured.
(以下余白)
第2表
ST:材料破懐して測定できず
第1表に示すように、低不飽和度ゴムの含有量が30重
量部以上のゴム組成物CDEFは、高不飽和度ゴム10
0重量部の従来配合のゴム組成物Aと比較して、耐オゾ
ン性が優れている上、変色が小さいか又は変色しない。(Leaving space below) Table 2 ST: As shown in Table 1, the rubber composition CDEF containing 30 parts by weight or more of low unsaturation rubber has a high unsaturation rubber content of 10 parts by weight.
Compared to Rubber Composition A with a conventional formulation of 0 parts by weight, it has excellent ozone resistance and little or no discoloration.
しかし、第2表に示すように、ゴム組成物CDEFはゴ
ム組成物Aとは接着力が小さく、このようなゴム組成物
CDEFでサイドウオールを形成してゴム組成物Aで構
成されるカーカスに当接しても、使用中にサイドウオー
ルとカーカスの間でセパレーションする確率が高くなる
。However, as shown in Table 2, the rubber composition CDEF has a low adhesion to the rubber composition A, and such a rubber composition CDEF can be used to form a sidewall to a carcass made of the rubber composition A. Even if they come into contact, there is a high probability of separation between the sidewall and carcass during use.
ところが、接着される両方のゴム組成物に低不飽和度ゴ
ムが適当置台まれる場合、例えばゴム組成物CとB、C
とC,CとDSBとDのように、接着される両者に含ま
れる高不飽和度ゴムの差が35重量部以下になるように
低不飽和度ゴムを混用し、て調整した場合には接着力が
高くなる。However, when low unsaturation rubber is appropriately placed in both rubber compositions to be bonded, for example, rubber compositions C and B, C
and C, C, DSB, and D, when adjusting by mixing low unsaturated rubber so that the difference in high unsaturated rubber contained in the two to be bonded is 35 parts by weight or less, Increases adhesive strength.
従って、サイドウオールの外面を構成する外層には、低
不飽和度ゴムの含有量が30重量部以上のゴム組成物を
使用して耐オゾン性を高め、更に、隣合う外層と内層、
内層とカーカスの間で、高不飽和度ゴムの含有量の差が
35重量部以下になるように、外層と内層を構成するゴ
ム組成物を選択することが好ましい。Therefore, for the outer layer constituting the outer surface of the sidewall, a rubber composition containing 30 parts by weight or more of low unsaturation rubber is used to improve ozone resistance.
It is preferable to select the rubber compositions constituting the outer layer and the inner layer so that the difference in the content of highly unsaturated rubber between the inner layer and the carcass is 35 parts by weight or less.
次に、上記の検討に基づき、サイドウオールの外層及び
内層を構成するゴム組成物の配合例(第3表)並びに組
合せ例(第4表)を示す。Next, based on the above study, examples of formulations (Table 3) and combinations (Table 4) of rubber compositions constituting the outer layer and inner layer of the sidewall are shown.
配合量はいずれも重量部である。All amounts are in parts by weight.
各表における諸物性のハ1定方法は前記したものと同様
であるが、ゴム〜ゴム間接着性評価においては、ゴム−
ゴム間の剥離界面の状態で評価し、界面剥離のものを!
、剥離せず切断するものをST、一部界面剥離するもの
を1−3Tと表示した。The method of determining various physical properties in each table is the same as that described above, but in the evaluation of rubber-to-rubber adhesion,
Evaluate the state of the peeling interface between the rubbers, and check for interfacial peeling!
, those that were cut without peeling were designated as ST, and those that partially peeled off at the interface were designated as 1-3T.
なお、第3表において外層又は内層との接着性を評価し
たカーカスゴムの組成は、以下の通りである。The composition of the carcass rubber whose adhesion to the outer layer or inner layer was evaluated in Table 3 is as follows.
(重量部)
天然ゴム 85
ブタジエンゴム 15
亜鉛華 5
ステアリン酸 1老化防止剤*1
2
タッキファイヤ−1
カーボンブラツク(F E F) 40ナフテニツ
クオイル 8
促進剤MSA” 1イオウ
2
*1: 第3表の老化防止剤と同じ
*2: N−オキシジエチレン−2−ベンゾチアゾール
スルフェンアミド
(以下余白)
第4表 組合せ例
次に、図面を用いて本願発明の空気入りタイヤの一実施
例を説明する。(Parts by weight) Natural rubber 85 Butadiene rubber 15 Zinc white 5 Stearic acid 1 Anti-aging agent*1
2 Tackifier 1 Carbon Black (FEF) 40 Naphthenic Oil 8 Accelerator MSA” 1 Sulfur
2 *1: Same as anti-aging agent in Table 3 *2: N-oxydiethylene-2-benzothiazolesulfenamide (blank below) Table 4 Combination examples Next, using the drawings, the pneumatic tire of the present invention An example of this will be described.
(1)は、ラジアル構造のカーカスである。このカーカ
ス(1)の側面に密着してサイドウオール(2)が配設
されている。サイドウオール(2)の主要部(5)は、
浮き彫りの文字や記号を除いて厚さが一様である。また
、このサイドウオール(2)は、内層(3)と外層(4
)の2層構造に形成されている。サイドウオール(2)
の上端部(6)は、トレッドゴム(8)の側面に配設さ
れ、厚さが漸減しながら延びて終端している。サイドウ
オールの下端部(7)は、厚さが漸減しながら終端して
おり、この下端部(7)にリムストリップ(9)が続い
た構造になっている。主要部(5)、上端部(6)及び
下端部(7)のそれぞれの内層は、低不飽和度ゴムが1
0〜30重量部で高不飽和度ゴムが90〜70重量部よ
りなるゴム組成物で構成されている。主要部(5)、上
端部(6)及び下端部(7)のそれぞれの外層は、低不
飽和度ゴムが30〜60重量部で高不飽和度ゴムが70
〜40重量部であるゴム組成物で構成されている。(1) is a carcass with a radial structure. A sidewall (2) is disposed in close contact with the side surface of this carcass (1). The main part (5) of the sidewall (2) is
The thickness is uniform except for the embossed letters and symbols. In addition, this sidewall (2) has an inner layer (3) and an outer layer (4).
) is formed into a two-layer structure. Side wall (2)
The upper end (6) is disposed on the side surface of the tread rubber (8), extends and terminates while gradually decreasing in thickness. The lower end (7) of the sidewall has a structure in which the thickness gradually decreases and ends, and a rim strip (9) continues to this lower end (7). The inner layer of each of the main part (5), upper end part (6) and lower end part (7) contains 1 layer of low unsaturation rubber.
The rubber composition is comprised of 0 to 30 parts by weight and 90 to 70 parts by weight of highly unsaturated rubber. The outer layer of each of the main part (5), upper end part (6) and lower end part (7) contains 30 to 60 parts by weight of low unsaturated rubber and 70 parts by weight of high unsaturated rubber.
~40 parts by weight of a rubber composition.
上記のように、サイドウオールの内層(3)は高不飽和
度ゴム組成物からなるトレッドゴム(8)、カーカス(
1)又はリムストリップ(9)と接するので、低不飽和
度ゴムを30重量部以下にする必要がある。As mentioned above, the inner layer (3) of the sidewall consists of a tread rubber (8) made of a highly unsaturated rubber composition, a carcass (
1) or the rim strip (9), the amount of low unsaturation rubber must be 30 parts by weight or less.
なお、トレッドゴム(8)は従来のように高不飽和度ゴ
ム組成物で構成するが、補強性の大きいハードカーボン
ブラックにより補強されており、接着性が劣るので、変
色性の少ない内層ゴムと同質のゴム組成物で構成された
トレッド側部ゴム(10)を、トレッドゴム(8)の側
面部に同時押出し成型によって配置し、サイドウオール
との接着性を高めることが好ましい。The tread rubber (8) is made of a highly unsaturated rubber composition as in the past, but it is reinforced with hard carbon black, which has a high reinforcing property, and has poor adhesion, so it is used as an inner layer rubber with less discoloration. It is preferable that the tread side rubber (10) made of a homogeneous rubber composition is placed on the side surface of the tread rubber (8) by coextrusion molding to improve adhesion to the sidewall.
本実施例の空気入りタイヤの効果を調べるため、サイド
ウオール(2)の外層(4)を第3表の実施例2のゴム
組成物で構成し、内層(3)を実施例5のゴム組成物で
構成した乗用車用タイヤを製造した。また、第3表の比
較例1のゴム組成物の単一層でサイドウオールを構成し
た従来方法のコントロールタイヤを製造した。In order to investigate the effect of the pneumatic tire of this example, the outer layer (4) of the sidewall (2) was composed of the rubber composition of Example 2 in Table 3, and the inner layer (3) was composed of the rubber composition of Example 5. Manufactured passenger car tires made of these materials. In addition, a conventional control tire was manufactured in which the sidewall was made of a single layer of the rubber composition of Comparative Example 1 in Table 3.
これらのタイヤを1ケ月間雨水がかからない南向の軒下
で日光曝露して、サイドウオールの変色を調べた。本実
施例のタイヤにおいては、ブルーム、変色及びクラック
の発生は認められなかった。これに対して、コントロー
ルタイヤのサイド表面には、クラックの発生は認められ
なかったが、ブルームが発生し、かつ、それが赤褐色に
変色して著しく外観を損じていた。これらの日光曝露済
みタイヤを用いて、JISD4230に記載の耐久性能
試験条件に従ってドラム試験を行なったところ、本実施
例タイヤ及びコントロールタイヤとも試験に合格した。These tires were exposed to sunlight for one month under a south-facing eaves where rainwater would not come in contact with them, and discoloration of the sidewalls was examined. In the tire of this example, no bloom, discoloration, or cracking was observed. On the other hand, no cracks were observed on the side surface of the control tire, but blooming occurred and the color changed to reddish brown, significantly impairing the appearance. Using these tires exposed to sunlight, a drum test was conducted according to the durability performance test conditions described in JISD4230, and both the example tire and the control tire passed the test.
[発明の効果]
上記のように、本願発明の空気入りタイヤは、タイヤの
耐久性能、耐オゾン性を保持しながら、タイヤのサイド
部の変色による美観の低下を改良するものである。[Effects of the Invention] As described above, the pneumatic tire of the present invention improves the deterioration in aesthetic appearance due to discoloration of the side portions of the tire while maintaining tire durability and ozone resistance.
更に、低不飽和度ゴムを用いながら、ジエン系ゴム組成
物で構成されたカーカス等との接着性に優れたサイドウ
オールを有する空気入りタイヤを提供するものである。Furthermore, the present invention provides a pneumatic tire that uses a low unsaturation rubber and has a sidewall that is made of a diene rubber composition and has excellent adhesion to a carcass or the like.
図は、本発明の一実施例を示すタイヤ子午半断面説明図
である。
符号の説明
(1)・・・カーカス、(2)・・・サイドウオール、
(3)・・・内層、(4)・・・外層、(5)・・・主
要部、(6)・・・上端部、(7)・・・下端部、(8
)・・・トレッドゴム、(9)・・・リムストリップ
図面の浄ガ内容に変更なし)
手続補正書(方式)
昭和63年 8月 5日
1、事件の表示
昭和63年特許願第128984号
2、発明の名称 ・
空気入りタイヤ
3、補正をする者
事件との関係 特許出願人
大阪市西区江戸堀1丁目17番18号
(314) 東洋ゴム工業株式会社
代表者松下秀夫
4、代理人
〒541大阪市東区瓦町2丁目9番地ハラダビル8階6
、補正の対象 図 面The figure is an explanatory diagram of a meridian half cross section of a tire showing one embodiment of the present invention. Explanation of symbols (1)...Carcass, (2)...Side wall,
(3)...Inner layer, (4)...Outer layer, (5)...Main part, (6)...Upper end, (7)...Lower end, (8
)...Tread rubber, (9)...No change in the cleaning content of the rim strip drawing) Procedural amendment (method) August 5, 1988 1, Indication of case Patent application No. 128984 of 1988 2. Name of the invention ・ Pneumatic tire 3. Relationship with the case of the person making the amendment Patent applicant No. 17-18 Edobori 1-chome, Nishi-ku, Osaka (314) Toyo Rubber Industries Co., Ltd. Representative Hideo Matsushita 4, Agent 541 8th floor 6, Harada Building, 2-9 Kawaramachi, Higashi-ku, Osaka
, Correction target drawing
Claims (1)
ル(2)が、カーカス(1)に隣接する内層(3)と、
その外側に配設した外層(4)の2層構造である空気入
りタイヤにおいて、内層(3)が、ハロゲン化ブチルゴ
ム及びエチレン・プロピレン・ジエンゴムからなる低不
飽和度ゴム群の少なくとも1種を10〜30重量部、並
びに、天然ゴム、イソプレンゴム、ブタジエンゴム及び
スチレン・ブタジエンゴムからなる高不飽和度ゴム群の
少なくとも1種を90〜70重量部配合してなるゴム組
成物で構成され、外層(4)が、前記低不飽和度ゴム群
の少なくとも1種を30〜60重量部、並びに前記高不
飽和度ゴム群の少なくとも1種を70〜40重量部配合
してなるゴム組成物で構成されたことを特徴とする空気
入りタイヤ。 2、内層(3)が、臭素化ブチルゴムを10〜30重量
部、エチレン・プロピレン・ジエンゴムを0〜20重量
部、及び前記高不飽和度ゴム群の少なくとも1種を90
〜70重量部配合してなるゴム組成物で構成され、外層
(4)が、臭素化ブチルゴムを20〜60重量部、エチ
レン・プロピレン・ジエンゴムを10〜30重量部、及
び前記高不飽和度ゴム群の少なくとも1種を70〜40
重量部配合してなるゴム組成物で構成されたことを特徴
とする請求項1記載の空気入りタイヤ。 3、ラジアル構造のカーカス(1)の側面を被覆保護す
るサイドウォール(2)が、カーカス(1)に隣接する
内層(3)と、その外側に配設した外層(4)の2層構
造になっている空気入りタイヤであって、サイドウォー
ルの上端部(6)はトレッドゴム(8)の側面に配設さ
れ厚さが漸減しながら延びて終端し、サイドウォールの
下端部(7)は厚さが漸減しながら終端してこのサイド
ウォールの下端部(7)にリムストリップ(9)が続き
、サイドウォール(2)の上端部(6)、主要部(5)
及び下端部(7)のそれぞれの内層は、前記低不飽和度
ゴム群の少なくとも1種を10〜30重量部及び前記高
不飽和度ゴム群の少なくとも1種を90〜70重量部配
合したゴム組成物で構成され、サイドウォール(2)の
上端部(6)、主要部(5)及び下端部(7)のそれぞ
れの外層は、前記低不飽和度ゴム群の少なくとも1種を
30〜60重量部及び前記高不飽和度ゴム群の少なくと
も1種を70〜40重量部配合したゴム組成物で構成さ
れたことを特徴とする請求項1又は2記載の空気入りタ
イヤ。[Claims] 1. A sidewall (2) that covers and protects the side surface of the carcass (1) has an inner layer (3) adjacent to the carcass (1);
In a pneumatic tire having a two-layer structure with an outer layer (4) disposed on the outside, the inner layer (3) contains at least one kind of low unsaturation rubber group consisting of halogenated butyl rubber and ethylene propylene diene rubber. ~30 parts by weight, and 90 to 70 parts by weight of at least one of the highly unsaturated rubber group consisting of natural rubber, isoprene rubber, butadiene rubber, and styrene-butadiene rubber, and the outer layer (4) is a rubber composition comprising 30 to 60 parts by weight of at least one member of the low unsaturation rubber group and 70 to 40 parts by weight of at least one member of the high unsaturation rubber group. A pneumatic tire characterized by: 2. The inner layer (3) contains 10 to 30 parts by weight of brominated butyl rubber, 0 to 20 parts by weight of ethylene propylene diene rubber, and 90 parts by weight of at least one of the highly unsaturated rubber group.
The outer layer (4) contains 20 to 60 parts by weight of brominated butyl rubber, 10 to 30 parts by weight of ethylene propylene diene rubber, and the highly unsaturated rubber. 70-40 at least one species of the group
2. The pneumatic tire according to claim 1, wherein the pneumatic tire is comprised of a rubber composition containing parts by weight. 3. The sidewall (2) that covers and protects the side surface of the carcass (1) with a radial structure has a two-layer structure consisting of an inner layer (3) adjacent to the carcass (1) and an outer layer (4) disposed outside of the inner layer (3). The upper end (6) of the sidewall is disposed on the side of the tread rubber (8) and extends while gradually decreasing in thickness until it ends, and the lower end (7) of the sidewall is disposed on the side of the tread rubber (8). The lower end (7) of this sidewall is followed by a rim strip (9) which gradually decreases in thickness, terminating at the lower end (7) of the sidewall (2) and at the upper end (6) of the main part (5).
The inner layer of each of the lower end portions (7) is made of a rubber containing 10 to 30 parts by weight of at least one of the low unsaturation rubber group and 90 to 70 parts by weight of at least one of the high unsaturation rubber group. The outer layer of each of the upper end (6), main part (5) and lower end (7) of the sidewall (2) contains at least one member of the low unsaturation rubber group in an amount of 30 to 60%. 3. The pneumatic tire according to claim 1, wherein the pneumatic tire is comprised of a rubber composition containing 70 to 40 parts by weight of at least one member of the group of highly unsaturated rubbers.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63128984A JPH01297307A (en) | 1988-05-26 | 1988-05-26 | Pneumatic tyre |
DE3914540A DE3914540A1 (en) | 1988-05-02 | 1989-05-02 | Pneumatic tyre |
US08/708,367 US5714022A (en) | 1988-05-02 | 1996-09-04 | Pneumatic tire with two-layer sidewalls |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63128984A JPH01297307A (en) | 1988-05-26 | 1988-05-26 | Pneumatic tyre |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH01297307A true JPH01297307A (en) | 1989-11-30 |
Family
ID=14998247
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63128984A Pending JPH01297307A (en) | 1988-05-02 | 1988-05-26 | Pneumatic tyre |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH01297307A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6382286B1 (en) | 1999-10-20 | 2002-05-07 | Sumitomo Rubber Industries, Ltd. | Pneumatic tires |
JP2002284927A (en) * | 2001-03-23 | 2002-10-03 | Ohtsu Tire & Rubber Co Ltd :The | Pneumatic tire |
JP2014095019A (en) * | 2012-11-08 | 2014-05-22 | Sumitomo Rubber Ind Ltd | Rubber composition for sidewall and pneumatic tire |
JP2019006838A (en) * | 2017-05-15 | 2019-01-17 | ハンコック タイヤ カンパニー リミテッド | Rubber composition for protecting side wall of tire from ozone and tire manufactured using the same |
US11059958B2 (en) | 2017-05-12 | 2021-07-13 | Hankook Tire Co., Ltd. | Rubber composition for protecting sidewall of tire from ozone and tire manufactured using the same |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5777207A (en) * | 1980-10-31 | 1982-05-14 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
JPS57186502A (en) * | 1981-05-11 | 1982-11-17 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
JPH01278805A (en) * | 1988-05-02 | 1989-11-09 | Toyo Tire & Rubber Co Ltd | Radial tire having two layer side wall |
-
1988
- 1988-05-26 JP JP63128984A patent/JPH01297307A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5777207A (en) * | 1980-10-31 | 1982-05-14 | Yokohama Rubber Co Ltd:The | Pneumatic tire |
JPS57186502A (en) * | 1981-05-11 | 1982-11-17 | Sumitomo Rubber Ind Ltd | Pneumatic tire |
JPH01278805A (en) * | 1988-05-02 | 1989-11-09 | Toyo Tire & Rubber Co Ltd | Radial tire having two layer side wall |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6382286B1 (en) | 1999-10-20 | 2002-05-07 | Sumitomo Rubber Industries, Ltd. | Pneumatic tires |
JP2002284927A (en) * | 2001-03-23 | 2002-10-03 | Ohtsu Tire & Rubber Co Ltd :The | Pneumatic tire |
JP2014095019A (en) * | 2012-11-08 | 2014-05-22 | Sumitomo Rubber Ind Ltd | Rubber composition for sidewall and pneumatic tire |
US11059958B2 (en) | 2017-05-12 | 2021-07-13 | Hankook Tire Co., Ltd. | Rubber composition for protecting sidewall of tire from ozone and tire manufactured using the same |
JP2019006838A (en) * | 2017-05-15 | 2019-01-17 | ハンコック タイヤ カンパニー リミテッド | Rubber composition for protecting side wall of tire from ozone and tire manufactured using the same |
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