JPH05139108A - Fire-retardant rubber tire - Google Patents

Fire-retardant rubber tire

Info

Publication number
JPH05139108A
JPH05139108A JP3300606A JP30060691A JPH05139108A JP H05139108 A JPH05139108 A JP H05139108A JP 3300606 A JP3300606 A JP 3300606A JP 30060691 A JP30060691 A JP 30060691A JP H05139108 A JPH05139108 A JP H05139108A
Authority
JP
Japan
Prior art keywords
rubber
flame
retardant
layer
tire
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
Application number
JP3300606A
Other languages
Japanese (ja)
Inventor
Kazuo Yagawa
一夫 矢川
Keizo Akutagawa
恵造 芥川
Takatsugu Hashimoto
隆次 橋本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bridgestone Corp
Original Assignee
Bridgestone Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bridgestone Corp filed Critical Bridgestone Corp
Priority to JP3300606A priority Critical patent/JPH05139108A/en
Priority to MX9206505A priority patent/MX9206505A/en
Priority to US07/974,519 priority patent/US5341862A/en
Priority to CA002082857A priority patent/CA2082857C/en
Priority to DE69212435T priority patent/DE69212435T2/en
Priority to EP92310449A priority patent/EP0542580B1/en
Priority to ES92310449T priority patent/ES2092061T3/en
Publication of JPH05139108A publication Critical patent/JPH05139108A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To provide a rubber tire having extremely high fire retardant property without damaging basic performances even when the rubber tire encounters a high temperature fire source having a large heat capacity by setting the degree of fire retardancy at 10 or more. CONSTITUTION:At least a part of an outer covering rubber part including the surface is constituted of one or more fire retardant rubber composite layers L1, L2. When the oxygen index (O. I) of the rubber composite layers L1, L2 is taken as 19.8 or more, the ratio of the surface area of the rubber composite layers to the entire surface area of the outer covering rubber part is represented by S, the weight of the rubber composite layers is V (kg), and the ratio of the weight V (kg) of the rubber composite layers to the total weight (kg) of the outer covering rubber part is R, the absolute value of the sum of (O. I.) (oxygen index of the respective fire retardant rubber composite layers) XSXVXR is defined as the degree of fire retardancy. In this case, the degree of fire-retardancy of a rubber tire provided with the tread rubber layer, the outer covering rubber part, a reinforcing part, is set at 10 or more. Thus, the fire retardant property can be enhanced even when the rubber tire encounters with a high-temperature fire source having a large heat capacity.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、例えば、地下鉄、モノ
レール及び新都市交通用車両等の電気車両や航空機、一
般自動車、建設車両、及び産業車両用ゴムタイヤに関
し、耐摩耗性や耐ヒートセパレーション性、耐クラック
性等の性能を保持しつつ、燃焼し難い安全なゴムタイヤ
に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to rubber tires for electric vehicles such as subways, monorails and vehicles for new urban transportation, aircraft, general vehicles, construction vehicles, and industrial vehicles, and has wear resistance and heat separation resistance. The present invention relates to a safe rubber tire that is hard to burn while maintaining performance such as crack resistance.

【0002】[0002]

【従来の技術】一般的に、ゴムタイヤは高温の火炎にさ
らされたり、高電圧、高電流の短絡により生じるスパー
クに遭うと燃焼し易い性質を有している。また、一旦着
火し燃焼状態になれば、容易に消火し得ないばかりでな
く燃焼温度が高く他への延焼を促し、更にカーボンを含
んだ有毒ガスを発生する危険がある。
2. Description of the Related Art Generally, a rubber tire has a property of being easily burned when exposed to a high temperature flame or a spark caused by a short circuit of a high voltage and a high current. Further, once ignited and in a combustion state, not only the fire cannot be extinguished easily, but also the combustion temperature is high and there is a danger of promoting the spread of fire to another and further generating a toxic gas containing carbon.

【0003】特に多くの人員を輸送するゴムタイヤ式電
気車両の場合、ゴムタイヤが燃えることは多くの人命に
拘わり、地下鉄車両の場合は密閉空間内であることから
問題は一層深刻である。
Particularly in the case of a rubber tire type electric vehicle that transports a large number of people, the burning of rubber tires is a serious problem for human life, and in the case of a subway vehicle, the problem is more serious because it is in an enclosed space.

【0004】また、航空機にあっては特にランディング
の際ゴムタイヤに苛酷な制動力を加えざるを得ない緊急
時、トレッドが局部的に高温になり発火することが想定
される。一般自動車では、引火、爆発の恐れがある危険
物輸送の場合に、ゴムタイヤが異常高温になり、発火の
恐れなしとは言えない。これらの諸点から、発火、燃焼
し難いゴムタイヤの出現が強く望まれるようになった。
Further, in an aircraft, it is expected that the tread locally becomes hot and ignites in an emergency when a severe braking force must be applied to the rubber tire during landing. In a general automobile, when transporting dangerous substances that may cause ignition or explosion, rubber tires reach an abnormally high temperature, and it cannot be said that there is no risk of ignition. From these points, the emergence of rubber tires that are difficult to ignite and burn has been strongly desired.

【0005】この要望に対し、特開平1−273703
で難燃性ゴムタイヤ、即ち、少なくとも一方のサイドウ
ォール部のゴム露出面に厚さが0.3 mmから3.0 mmの
難燃ゴム組成物層を形成するゴムタイヤが提案されてい
る。これは、特にモノレール等に使用されるゴムタイヤ
にあっては、装着箇所が電気火花を発生する電動モータ
ーの集電装置近傍に位置することから、サイドウォール
部に限定し難燃ゴム組成物を適用せんとしたものであ
る。
In response to this demand, Japanese Patent Laid-Open No. 1-273703
A flame-retardant rubber tire, that is, a rubber tire in which a flame-retardant rubber composition layer having a thickness of 0.3 mm to 3.0 mm is formed on the exposed rubber surface of at least one sidewall portion is proposed. This is because in rubber tires used for monorails, etc., the flame-retardant rubber composition is applied only to the sidewall portion because the mounting location is located near the current collector of the electric motor that generates electric sparks. It is a spoiler.

【発明が解決しようとする課題】[Problems to be Solved by the Invention]

【0006】然るに、電気車両用のゴムタイヤ炎焼を論
じるにあたって最も留意すべき点は、漏電の際、接地し
ているゴムタイヤトレッド面を通じて電流が軌道上にア
ースされることである。この際、一般に大電流である為
トレッドと軌道面の間で爆発音を伴う激しいスパーク現
象が生じることになる。このスパークが短時間であるに
せよ、時によってはゴムタイヤのトレッドを発火に至ら
しめ、これがゴムタイヤの火災、炎上をもたらす危険が
ある。
However, the most important point in discussing the rubber tire flame burning for electric vehicles is that the electric current is grounded on the track through the grounded rubber tire tread surface at the time of electric leakage. At this time, since a large current is generally applied, a severe spark phenomenon with an explosion sound occurs between the tread and the raceway surface. Even if the spark is short, it sometimes causes the tread of the rubber tire to be ignited, which may cause a fire or flame of the rubber tire.

【0007】この危険を回避すべく、一時期ゴムタイヤ
の電気抵抗値を極端に、例えば数メグオームから数十メ
グオーム以上とすることが試みられたが、反って人体へ
の感電の危険、他の部品への悪影響等の問題が提起さ
れ、現在の低電気抵抗値のゴムタイヤが好適とされた。
難燃ゴム組成物をサイドウォール部のみに形成する前記
従来技術におけるゴムタイヤは上記した諸点が全く考慮
されていないという問題があった。
In order to avoid this danger, it has been attempted to make the electric resistance value of the rubber tire for a period of time extremely, for example, from several megohms to several tens of megohms or more. However, on the contrary, there is a risk of electric shock to the human body and other parts. The problems such as the adverse effect of the above have been raised, and the present rubber tires having a low electric resistance value are suitable.
The rubber tire according to the prior art, in which the flame-retardant rubber composition is formed only on the sidewall portion, has a problem in that the above-mentioned points are not taken into consideration at all.

【0008】更に、航空機用ゴムタイヤにあっても上記
同様な問題が存在するのは明白であり、一般車両用ゴム
タイヤにおいてもトレッドが何らかの原因、例えば、ト
レッド補強のベルト層にスチールコードを配したゴムタ
イヤでセパレーションが生じ、スチールコード同士が互
いに擦れ合って高温になり、トレッドに裂け目が生じる
などの原因でトレッドに着火することが考えられる。ゴ
ムタイヤ内部からの着火のみならず、外部からの高温、
火炎を受ける際もサイドウォールのみの難燃ゴム組成物
形成では不完全であり実用性に難点があった。
Further, it is clear that the same problem as above also exists in the rubber tires for aircraft. In the rubber tires for general vehicles, the tread has some cause, for example, the rubber tire in which the steel cord is arranged in the belt layer for tread reinforcement. Separation occurs, the steel cords rub against each other and become hot, and the tread may be ignited due to a crack in the tread. Not only ignition from inside the rubber tire, but also high temperature from outside,
Even when receiving a flame, the formation of the flame-retardant rubber composition of only the sidewall was incomplete, and there was a problem in practical use.

【0009】これら諸点を考察するに、ゴムタイヤとし
て最も基本的かつ重要特性である耐摩耗性、耐発熱性、
耐セパレーション性等が先行重視され難燃ゴム組成物を
トレッドに用いるにあたり、これら諸特性を大きく損ね
ることの危惧から、燃焼を促す多種の環境条件に対処し
得る難燃ゴムタイヤが従来の技術に存在していないと思
考される。
Considering these points, the most basic and important characteristics of rubber tires are wear resistance, heat resistance,
When using a flame-retardant rubber composition in a tread where separation resistance and the like are prioritized, there is a danger that these properties will be greatly impaired.Therefore, there is a flame-retardant rubber tire capable of coping with various environmental conditions that promote combustion in the conventional technology. It is thought that I have not done it.

【0010】本発明は、前記の諸問題を解決すべくなさ
れたものである。即ち、本発明の目的は、難燃ゴムタイ
ヤに関し、トレッドの耐摩耗性、耐発熱性、耐セパレー
ション性、耐クラック性等のゴムタイヤに要求される基
本特性を損ねることなく、想定し得る数多くの燃焼を促
す環境の元で、ゴムタイヤを着火し難く、かつ、燃焼し
難いものとすることである。
The present invention has been made to solve the above problems. That is, the purpose of the present invention relates to a flame-retardant rubber tire, wear resistance of the tread, heat resistance, separation resistance, cracking resistance, etc. without impairing the basic characteristics required for the rubber tire, many possible combustion It is to make the rubber tire difficult to ignite and to burn under the environment that promotes fire.

【0011】[0011]

【問題点を解決するための手段】本発明は、トレッドゴ
ム層と、該ゴム層の両側に連なり径方向内側に向かって
ビード部近傍まで延在するサイドゴム層とからなる外皮
ゴム部と、該ゴム部の内側に補強部とを備えたゴムタイ
ヤにおいて、表面を含む外皮ゴム部の少なくとも一部を
一層以上の難燃ゴム組成物層とするとともに、このゴム
組成物層の酸素指数(O.I.)を19.8以上とし、外皮
ゴム部の全表面積に対する該ゴム組成物層が占める表面
積の比をS、該ゴム組成物層の重量をV(kg) 、外皮ゴ
ム部の全重量(kg)に対する該ゴム組成物層の重量V(kg)
の比をRとしたとき、それぞれの難燃ゴム組成物層の
(O.I.)×S×V×Rの値の総和の絶対値をゴムタ
イヤの難燃度と定義し、この難燃度を10以上としたこと
を特徴とする難燃ゴムタイヤであり、また、標準リムに
装着した後に外部に露出する外皮ゴム部の表面積に対す
る難燃ゴム組成物層が占める表面積の比Sの総和が少な
くも0.30であり、外皮ゴム部の全重量(kg)に対する該ゴ
ム組成物層の重量V(kg)の比Rが0.40以上であることが
望ましい。
According to the present invention, there is provided an outer rubber part including a tread rubber layer and side rubber layers which are continuous with both sides of the tread rubber layer and extend radially inward to the vicinity of the bead portion. In a rubber tire having a reinforcing portion inside the rubber portion, at least a part of the outer rubber portion including the surface is made into one or more flame-retardant rubber composition layers, and the oxygen index (O.I.I. .) Is 19.8 or more, the ratio of the surface area occupied by the rubber composition layer to the total surface area of the outer rubber part is S, the weight of the rubber composition layer is V (kg), and the total weight of the outer rubber part (kg) Weight V (kg) of the rubber composition layer
When the ratio of R is R, the absolute value of the sum of the values of (O.I.) × S × V × R of each flame-retardant rubber composition layer is defined as the flame retardancy of the rubber tire. Is 10 or more, and the total sum of the surface area ratio S of the flame-retardant rubber composition layer to the surface area of the outer rubber portion exposed to the outside after mounting on the standard rim is small. Is 0.30, and the ratio R of the weight V (kg) of the rubber composition layer to the total weight (kg) of the outer rubber part is preferably 0.40 or more.

【0012】以下に図を用いて本発明を更に詳細に説明
する。図1に本発明に従うゴムタイヤの幅方向断面をタ
イヤ赤道面X−Xより左半分について例示する。図の1
はゴムタイヤ、2はトレッドゴム層、3はトレッドゴム
層の側端面Pに連なりビード部4近傍まで延在するサイ
ドゴム層であり、トレッドゴム層とサイドゴム層で外皮
ゴム部を構成する。
The present invention will be described in more detail below with reference to the drawings. FIG. 1 illustrates a cross section in the width direction of the rubber tire according to the present invention for the left half of the tire equatorial plane XX. Figure 1
Is a rubber tire, 2 is a tread rubber layer, and 3 is a side rubber layer that is continuous with the side end surface P of the tread rubber layer and extends to the vicinity of the bead portion 4. The tread rubber layer and the side rubber layer form an outer rubber layer.

【0013】この外皮ゴム部の内側には、一対のビード
コアー9(一方側のみ示す)にトロイド状に跨がるカー
カス本体部分とこれに連なる折り返し部分より成るカー
カス5とベルト6とで主骨格が形成され、ベルト端部に
接する内方にはクッションゴム7、カーカス本体部分と
折り返し部分に挟まれ径方向外側に延在するスティフナ
ーゴム8及びビード部補強層10とで副骨格が形成されて
いて、これら両骨格がゴムタイヤの補強部を構成する。
Inside the outer rubber part, a main skeleton is composed of a carcass body portion which straddles a toroidal shape on a pair of bead cores 9 (only one side is shown), and a carcass 5 and a belt 6 which are composed of folded portions connected to the carcass body portion. The cushion rubber 7, the stiffener rubber 8 which is sandwiched between the carcass body portion and the folded portion and extends outward in the radial direction, and the bead portion reinforcing layer 10 form a sub-skeleton inside the belt. Both of these skeletons form a reinforcing portion of the rubber tire.

【0014】また、11はトレッドゴム層に設けられた周
方向溝である。12はゴムタイヤ1を装着する標準リムで
あり、13はそのフランジである。尚、トレッドゴム層端
縁とサイドゴム層と接する位置をPで、サイドゴム層の
径方向内側端縁をRでそれぞれ示す。また、Sで示され
る位置はゴムタイヤ1を標準リム12に装着し、標準空気
圧を充填した際のサイドゴム層とフランジ13との接触位
置を示す。
Reference numeral 11 is a circumferential groove provided in the tread rubber layer. 12 is a standard rim on which the rubber tire 1 is mounted, and 13 is its flange. The position where the tread rubber layer edge and the side rubber layer are in contact is indicated by P, and the radially inner edge of the side rubber layer is indicated by R. The position indicated by S indicates the contact position between the side rubber layer and the flange 13 when the rubber tire 1 is mounted on the standard rim 12 and filled with standard air pressure.

【0015】ここに、外皮ゴム部の少なくも一部を占め
る難燃ゴム組成物層を、例えば、図1のトレッドゴム層
2の外側を占める斜線部分L1 で示し,サイドゴム層3
の同じく外側を占める斜線部分L2 に示す。図1では左
半分のみを示したが右半分も同じく難燃ゴム組成物層L
3 を設けてよいのは勿論である。この際、L2 とL3
同一ゴム組成物、同一形状としてもよいが、用途により
それぞれを異ならせてもよい。また、L1 、L2 、L3
の関係に於いても同様である。
The flame-retardant rubber composition layer occupying at least a part of the outer rubber portion is shown by, for example, a shaded portion L 1 occupying the outside of the tread rubber layer 2 in FIG. 1, and the side rubber layer 3
Is also shown in the shaded portion L 2 which also occupies the outside. Although only the left half is shown in FIG. 1, the right half also has the same flame-retardant rubber composition layer L.
Of course, 3 may be provided. At this time, L 2 and L 3 may have the same rubber composition and the same shape, but they may be different depending on the application. Also, L 1 , L 2 , L 3
The same applies to the relationship.

【0016】前記の難燃ゴム組成物層L1 、L2 、L3
のそれぞれの酸素指数を(O.I.)1,(O.I.)2,
(O.I.)3 とし、外皮ゴム部の全表面積に対する前
記のL1 、L2 、L3 それぞれの表面積の比がS1 、S
2 、S3 であり、前記のL1 、L2 、L3 それぞれの重
量がV1(kg) 、V2(kg) 、V3(kg) であり、更に、外皮
ゴム部の全重量(kg)に対する前記のV1(kg) 、V2(kg)
、V3(kg) のそれぞれの比がR1 、R2 、R3 である
とき、(O.I.)1 ×S1 ×V1 ×R1 と、(O.
I.)2 ×S2 ××V2 ×R2 と、(O.I.)3 ×S
3×V3 ×R3 とで得られるそれぞれの値の総和の絶対
値を、本発明では図1に従うゴムタイヤの難燃度と呼称
し、定義する。
The above flame-retardant rubber composition layers L 1 , L 2 , L 3
The respective oxygen indices of (O.I.) 1 , (O.I.) 2 ,
(O.I.) 3 and the ratio of the surface area of each of L 1 , L 2 and L 3 to the total surface area of the outer rubber part is S 1 , S
2 , S 3 and the respective weights of L 1 , L 2 and L 3 are V 1 (kg), V 2 (kg) and V 3 (kg), and the total weight of the outer rubber part ( V 1 (kg), V 2 (kg) with respect to kg)
, V 3 (kg) are R 1 , R 2 and R 3 respectively, (O.I.) 1 × S 1 × V 1 × R 1 and (O.I.
I. ) 2 × S 2 ×× V 2 × R 2 and (O.I.) 3 × S
In the present invention, the absolute value of the sum of the respective values obtained by 3 × V 3 × R 3 is referred to as the flame retardancy of the rubber tire according to FIG. 1 and is defined.

【0017】ここで、前記の難燃度を絶対値としたの
は、難燃度とは、ゴムタイヤの難燃性の指標とする値で
あり、kgを付すのは不適切であるのでkgを除いたもので
ある。また、絶対値と称するのは前記の意味である。
The above-mentioned flame retardancy is defined as an absolute value. The flame retardancy is a value used as an index of the flame retardancy of rubber tires. Excluded. The absolute value has the above meaning.

【0018】本発明においては、前記酸素指数(O.
I.)の値を19.8以上とすることが望ましく、好ましく
は20.2以上27.5以下の範囲とし、更に好ましくは20.4以
上25.0以下の範囲とすることである。尚本発明の難燃ゴ
ム組成物の酸素指数はJIS K 7201に準拠したものであ
る。
In the present invention, the oxygen index (O.
I. The value of 1) is desirably 19.8 or more, preferably in the range of 20.2 or more and 27.5 or less, and more preferably in the range of 20.4 or more and 25.0 or less. The oxygen index of the flame-retardant rubber composition of the present invention complies with JIS K 7201.

【0019】更に本発明においては、前記難燃度を10以
上とするのが好ましく、13以上2750以下とすれば更に好
ましく、15以上1000以下とすれば殊更好ましい。
Further, in the present invention, the flame retardancy is preferably 10 or more, more preferably 13 or more and 2750 or less, and most preferably 15 or more and 1000 or less.

【0020】また、難燃ゴム組成物層それぞれの表面積
の外皮ゴム部全表面積に対する比Sの総和、即ち、外皮
ゴム部全表面積に対する前記のL1 、L2 、L3 それぞ
れの表面積の比S1 、S2 及びS3 の和を0.30以上とす
るのが望ましく、0.40以上とすれば更に好ましい。
Further, the sum of the ratios S of the surface areas of the flame-retardant rubber composition layers to the total surface area of the outer rubber portion, that is, the ratio S of the surface areas of L 1 , L 2 and L 3 to the total surface area of the outer rubber portion. The sum of 1 , S 2 and S 3 is preferably 0.30 or more, more preferably 0.40 or more.

【0021】また、難燃ゴム組成物層の重量V(kg)
の外皮ゴム部全重量(kg)に対する比Rの総和、即
ち、外皮ゴム部全重量(kg)に対する前記のL1 、L
2 およびL3 それぞれの重量V1(kg) 、V2(kg) 、V
3(kg) のそれぞれの比R1 、R2 及びR3 の総和が少な
くも0.40であり、好ましくは0.45以上、更に好ましくは
0.50以上0.80以下とすることである。
The weight V (kg) of the flame-retardant rubber composition layer
Of the ratio R to the total weight (kg) of the outer rubber part, that is, the above L 1 and L relative to the total weight (kg) of the outer rubber part.
2 and L 3 respectively weight V 1 (kg), V 2 (kg), V
The sum of the respective ratios R 1 , R 2 and R 3 of 3 (kg) is at least 0.40, preferably 0.45 or more, more preferably
It is to be 0.50 or more and 0.80 or less.

【0022】かくすることにより、本発明の目的とする
他のゴムタイヤ諸特性を損なう事なく高度な難燃性を備
えたゴムタイヤが得られる。尚、上記の外皮ゴム部全表
面積とは、図1で示す一方の接触位置Sから他方の同様
Sまでの間に亙って外部に露出しているゴムタイヤの全
表面積を指す。以下同様である。
By doing so, a rubber tire having a high degree of flame retardancy can be obtained without impairing other characteristics of the rubber tire, which is the object of the present invention. The total surface area of the outer rubber portion refers to the total surface area of the rubber tire exposed to the outside from one contact position S shown in FIG. 1 to the other similar position S. The same applies hereinafter.

【0023】前記の本発明に従うゴムタイヤでは、難燃
ゴム組成物層を三層とした例を示し説明したが、本発明
にあっては、難燃ゴム組成物層が一層以上であれば、前
記同様とするものである。
In the rubber tire according to the present invention described above, an example in which the flame-retardant rubber composition layer has three layers has been described, but in the present invention, if the flame-retardant rubber composition layer is one or more, The same shall apply.

【0024】前記の酸素指数(O.I.)の値を得るた
め、外皮ゴム部に配置する層の難燃ゴム組成物は、エラ
ストマーとして、天然ゴム、スチレンーブタジエン共重
合体ゴム、ポリブタジエンゴム、アクリロニトリルーブ
タジエン共重合体ゴム、エチレンープロピレンー共役ジ
エン三元共重合体ゴム、ブチルゴム、ハロゲン化ブチル
ゴム、フッ素ゴム、エピクロロヒドリンゴム等を用いる
事が可能である。
In order to obtain the above-mentioned oxygen index (O.I.) value, the flame-retardant rubber composition of the layer arranged in the outer rubber portion is made of natural rubber, styrene-butadiene copolymer rubber, polybutadiene rubber as an elastomer. It is possible to use acrylonitrile-butadiene copolymer rubber, ethylene-propylene-conjugated diene terpolymer rubber, butyl rubber, halogenated butyl rubber, fluororubber, epichlorohydrin rubber and the like.

【0025】しかしゴムタイヤの諸性能を考慮すれば、
上記の諸エラストマーのうち、天然ゴム、スチレンーブ
タジエン共重合体ゴム、ポリブタジエンゴム、アクリロ
ニトリルーブタジエン共重合体ゴム、エチレンープロピ
レンー共役ジエン三元共重合体ゴム、ブチルゴム、ハロ
ゲン化ブチルゴム等を単独ないしブレンドして用いるの
が好ましい。
However, considering various performances of the rubber tire,
Among the above elastomers, natural rubber, styrene-butadiene copolymer rubber, polybutadiene rubber, acrylonitrile-butadiene copolymer rubber, ethylene-propylene-conjugated diene terpolymer rubber, butyl rubber, halogenated butyl rubber, etc. are used alone. Or it is preferable to use them by blending.

【0026】また、難燃ゴム組成物の上記エラストマー
に配合される難燃剤として、塩素化パラフィン、三酸化
アンチモン、水酸化アルミニュウム、水酸化マグネシュ
ウム、ヘキサブロモベンゼン、テトラブロモビスフェノ
ールA、トリフェニルフォスフェート、トリクレジルフ
ォスフェート、赤燐等の諸剤から選ばれる少なくも一の
難燃剤を用いる事ができる。
As the flame retardant compounded in the above elastomer of the flame retardant rubber composition, chlorinated paraffin, antimony trioxide, aluminum hydroxide, magnesium hydroxide, hexabromobenzene, tetrabromobisphenol A, triphenyl phosphate. , At least one flame retardant selected from various agents such as tricresyl phosphate and red phosphorus can be used.

【0027】なかでも本発明においては、高度な難燃性
効果及びゴムとの好ましい相溶性の点から、塩素化パラ
フィン、三酸化アンチモン、水酸化アルミニュウム、水
酸化マグネシュウム、赤燐等の諸剤を好適な難燃剤とし
て組み合わせ用いるを可とする。
Among them, in the present invention, various agents such as chlorinated paraffin, antimony trioxide, aluminum hydroxide, magnesium hydroxide, red phosphorus and the like are used in view of the high flame retardant effect and preferable compatibility with rubber. It can be used in combination as a suitable flame retardant.

【0028】更にまた、本発明の難燃ゴム組成物に配合
する他の薬品として、カーボン等の補強剤、充填剤、軟
化剤、加硫剤、加硫促進剤、加硫促進助剤、軟化剤、老
化防止剤等の従来のゴムタイヤに使用する全ての配合剤
を用いることができる。
Furthermore, as other chemicals to be added to the flame-retardant rubber composition of the present invention, reinforcing agents such as carbon, fillers, softening agents, vulcanizing agents, vulcanization accelerators, vulcanization accelerating aids, and softening agents. All compounding agents used for conventional rubber tires such as agents and antiaging agents can be used.

【0029】[0029]

【作用】発明者等は、各種実験の結果、ゴムタイヤの難
燃性は外皮ゴム部に用いられている難燃ゴム組成物のみ
に支配されず、該組成物の使用量と使用形態に大きく依
存するとの知見に基ずき以下の結論に到達した。
As a result of various experiments, the inventors have found that the flame retardancy of rubber tires is not governed only by the flame-retardant rubber composition used in the outer rubber part, but largely depends on the amount and form of use of the composition. Based on this finding, the following conclusions were reached.

【0030】即ち、ゴム組成物の使用量に関して発明者
等は、前記従来技術の難燃ゴム組成物の単体試験片のみ
の燃焼実験を行ったところ、難燃性は認められたもの
の、該ゴムをゴムタイヤのサイド部(総厚さ7mm)の
表面に3mm厚さで設け、実際の火災を想定した燃焼実
験を実施したところ約690 ℃で燃焼し、難燃性は殆ど認
められず、使用量不足との結論に至った。
That is, regarding the amount of the rubber composition to be used, the inventors conducted a combustion test of only a single test piece of the flame-retardant rubber composition of the above-mentioned prior art. Was installed on the surface of the side part (total thickness 7 mm) of the rubber tire with a thickness of 3 mm, and a combustion experiment was conducted assuming an actual fire. It burned at about 690 ° C and almost no flame retardancy was observed. We came to the conclusion that there was a shortage.

【0031】更に、酸素指数(O.I.)の値が19.2で
ある比較的可燃性を有する従来ゴムタイヤのゴム組成物
の燃焼実験では、外皮ゴム部の容積(重量)が火源の熱
容量に対し十分に大きい値を有していれば、ゴムタイヤ
として難燃性を有するとの結果を得た。
Further, in a combustion experiment of a rubber composition of a conventional rubber tire having an oxygen index (O.I.) value of 19.2, the volume (weight) of the outer rubber part was determined as the heat capacity of the fire source. On the other hand, when the value was sufficiently large, the result was that the rubber tire had flame retardancy.

【0032】これらの結果を解析、総合すれば、単に難
燃ゴム組成物をゴムタイヤの外皮ゴム部に形成しさえす
れば難燃ゴムタイヤが得られるとは言えず、火源の熱容
量に対し難燃ゴム組成物層の外皮ゴム部に占める容積、
言い換えれば、重量と表面積とが重要な役割を果たして
いるとの示唆を得るに至った。
By analyzing and synthesizing these results, it cannot be said that a flame-retardant rubber tire can be obtained only by forming the flame-retardant rubber composition on the outer rubber portion of the rubber tire, and the flame-retardant property against the heat capacity of the fire source is reduced. Volume occupied in the outer rubber part of the rubber composition layer,
In other words, it has been suggested that weight and surface area play important roles.

【0033】因って発明者等は、実際の火災や前記した
高電圧、大電流のスパーク等の火源の熱容量を十分考慮
した難燃ゴムタイヤを成立させるために、酸素指数
(O.I.)と、ゴムタイヤ外皮ゴム部の全重量に対す
る難燃ゴム組成物層の重量の比Rと、難燃ゴム組成物層
の重量V(kg) とを必須な要素とし、加えて、外皮ゴム
部全表面積に対する難燃ゴム組成物層の表面積の比Sを
も重要要素として取り入れる必要があるとの知見を得
た。
Therefore, the inventors have found that in order to establish a flame-retardant rubber tire in which the heat capacity of a fire source such as an actual fire or the above-mentioned high-voltage and large-current spark is sufficiently taken into consideration, the oxygen index (O.I. ), The ratio R of the weight of the flame-retardant rubber composition layer to the total weight of the rubber tire outer rubber portion, and the weight V (kg) of the flame-retardant rubber composition layer are essential elements. It was found that the ratio S of the surface area of the flame-retardant rubber composition layer to the surface area also needs to be incorporated as an important factor.

【0034】しかし、前記の(O.I.)、S、V、R
等の各要素を無秩序にゴムタイヤの外皮ゴム部に適用し
ても十分な難燃性とゴムタイヤ性能とを兼ね備えた結果
が得られないことを見出した。発明者等は各種実験と研
究を重ねた結果、まづ、上記の各要素の積、即ち(O.
I.)×S×V×Rで得られる値を所定の値以上とする
ことで、ゴムタイヤの難燃性と諸性能を両立させ得ると
の結論に至った。
However, the above (O.I.), S, V, R
It has been found that even if the above elements are randomly applied to the outer rubber part of the rubber tire, a result having sufficient flame retardancy and rubber tire performance cannot be obtained. As a result of repeated experiments and researches, the inventors of the present invention first found that the product of the above respective elements, that is, (O.
I. It is concluded that the flame retardancy and various performances of the rubber tire can be made compatible by setting the value obtained by) × S × V × R to a predetermined value or more.

【0035】更に、ゴムタイヤの使用環境いかんによ
り、同一の難燃ゴム組成物層を外皮ゴム部に配置すれば
難燃性に限界が生じ、図1に示したように、異種の好ま
しい難燃ゴム組成物を異なる望ましい外皮ゴム部位に配
置することで燃焼を促す全ゆる環境条件に対処し得るこ
とを見出した。
Further, depending on the environment in which the rubber tire is used, if the same flame-retardant rubber composition layer is placed in the outer rubber part, the flame retardancy will be limited, and as shown in FIG. It has been found that the composition can be placed in different desirable skin rubber sites to address all environmental conditions that promote combustion.

【0036】上記したように、表面を含む外皮ゴム部に
一層以上の難燃ゴム組成物層を形成し、それぞれの難燃
ゴム組成物層の(O.I.)×S×V×Rの値の総和の
絶対値をゴムタイヤが燃焼し難い指標、即ち、難燃度と
し、この値を所定の値以上、ないし、所定の値の範囲と
することで本発明の目的を達成し得ることを見出したの
である。
As described above, one or more flame-retardant rubber composition layers are formed on the outer rubber part including the surface, and the (O.I.) × S × V × R of each flame-retardant rubber composition layer is formed. The absolute value of the sum of the values is an index at which the rubber tire is difficult to burn, that is, the flame retardancy, and this value is equal to or more than a predetermined value, or by setting a range of a predetermined value, it is possible to achieve the object of the present invention. I found it.

【0037】ここで、酸素指数(O.I.)の値を19.8
以上としたのは、19.8未満では火源を止めた後も燃焼を
継続し、焼失する不具合が生じるからである。
Here, the value of the oxygen index (O.I.) is set to 19.8.
The reason for the above is that if it is less than 19.8, combustion continues even after the fire source is stopped and there is a problem of burning out.

【0038】難燃ゴム組成物層の外皮ゴム部表面積に対
する比Sの総和を0.30以上としたのは、0.30未満では火
源の熱容量が大きな場合に難燃ゴム組成物層以外の外皮
ゴム部が燃焼し目的が達成し得ないからである。
The sum of the ratio S of the flame-retardant rubber composition layer to the surface area of the outer-rubber rubber portion is set to 0.30 or more. When the heat capacity of the fire source is large below 0.30, the outer-rubber rubber portion other than the flame-retardant rubber composition layer is This is because it burns and the purpose cannot be achieved.

【0039】更に、外皮ゴム部の重量(kg)に対する難燃
ゴム組成物層の重量V(kg)の比Rの総和を0.40以上とし
たのは、0.40満では前記同様に火源の熱容量が大きな場
合に燃焼が継続し、難燃ゴムタイヤが成立し得ないから
である。要は、前記したSとRとの関係において、一方
が他方より極端に小さな値ではバランスが保てず、結局
燃焼に至るのである。
Furthermore, the sum of the ratio R of the weight V (kg) of the flame-retardant rubber composition layer to the weight (kg) of the outer rubber part is set to 0.40 or more. This is because if it is large, combustion continues and a flame-retardant rubber tire cannot be established. In short, in the relationship between S and R described above, if one value is extremely smaller than the other, the balance cannot be maintained, and eventually combustion will occur.

【0040】本発明にて導入した難燃度の値を10以上と
したのは、10未満では、想定される火源の熱容量がある
レベルより大きな場合ゴムタイヤとしての難燃性が十分
でなく、また、難燃度を2750以下を好ましいとしたの
は、2750を越えるとトレッドの摩耗が促進され、ゴムタ
イヤの基本要求特性の摩耗寿命が満たされないことに加
え、他の性能、例えば、耐ヒートセパレーション性や耐
クラック性等が著しく低下する恐れがあるからである。
The value of the flame retardancy introduced in the present invention is set to 10 or more because when it is less than 10, the flame retardancy as a rubber tire is not sufficient when the heat capacity of the assumed fire source is larger than a certain level, In addition, the flame retardancy of 2750 or less is preferable because the abrasion of the tread is promoted when it exceeds 2750, in addition to the fact that the wear life of the basic required characteristics of the rubber tire is not satisfied, other performance, for example, heat separation resistance. This is because there is a possibility that the properties, crack resistance, etc. may be significantly reduced.

【0041】次いで、難燃ゴム組成物に特に好ましい難
燃剤として塩素化パラフィン、三酸化アンチモン、水酸
化アルミニュウム、水酸化マグネシュウム、赤燐等の諸
剤を配合したのは、難燃ゴムとの相溶性が良好であるこ
と及びゴムタイヤのゴムとしての物理特性、例えば、耐
摩耗性、耐亀裂成長性等の性能に悪影響を及ぼす恐れが
少ないことによる。更にこれに加え、好ましい難燃効果
が得られることによる。即ち、約650 ℃から1200℃の燃
焼温度にさらされた際、不燃性ガス発生による空気中酸
素の希釈、結晶水の放出による吸熱反応、ポリリン酸皮
膜形成による酸素遮断と炭化層形成等の複合効果が期待
されるからである。
Next, various flame retardant agents such as chlorinated paraffin, antimony trioxide, aluminum hydroxide, magnesium hydroxide, and red phosphorus were added to the flame retardant rubber composition as a particularly preferable flame retardant. This is because the solubility is good and there is little possibility of adversely affecting the physical properties of the rubber tire as rubber, such as wear resistance and crack growth resistance. In addition to this, a preferable flame retardant effect is obtained. That is, when exposed to a combustion temperature of about 650 ° C to 1200 ° C, the oxygen in the air is diluted by the generation of noncombustible gas, the endothermic reaction by the release of crystal water, the oxygen blocking and the carbonized layer formation by the polyphosphoric acid film formation, etc. This is because an effect is expected.

【0042】[0042]

【実施例】実施例1から実施例3までサイズが13/80R
20で、図1ないし図2の基本構成になるゴムタイヤであ
る。尚、図2は外皮ゴム部を除き図1と同一であり同一
構成部分には同一記号を付した。また、図1、図2に従
う本発明になるゴムタイヤ、更に、比較ゴムタイヤ及び
従来ゴムタイヤを含め外皮ゴム部内側の補強部は全て同
一とした。
[Example] From Example 1 to Example 3 size is 13 / 80R
20 is a rubber tire having the basic configuration shown in FIGS. 1 and 2. Note that FIG. 2 is the same as FIG. 1 except for the outer rubber portion, and the same components are designated by the same symbols. Further, the rubber tire according to the present invention according to FIGS. 1 and 2, and further, the reinforcing portions inside the outer rubber portion including the comparative rubber tire and the conventional rubber tire are all the same.

【0043】即ち、前記補強部は、一対のビードコアー
9にトロイド状に跨がるスチールコード補強になる一プ
ライのラジアルカーカス5と、ラジアルカーカスの径方
向外側にスチールコード補強になる二層のベルト6を備
え、ベルトの両側端部の径方向内側にはクッションゴム
7を備え、ラジアルカーカス本体部と折り返し部の間に
はスティフナーゴム8を配し、更に、ラジアルカーカス
5の折り返し部の外側に沿ってビード補強層10を以てな
る。
That is, the reinforcing portion is a one-ply radial carcass 5 for reinforcing the steel cord that straddles a pair of bead cores 9 in a toroidal shape, and a two-layer belt for reinforcing the steel cord radially outside the radial carcass. 6, the cushion rubber 7 is provided on the inner side in the radial direction at both end portions of the belt, the stiffener rubber 8 is arranged between the radial carcass main body portion and the folded portion, and further on the outer side of the folded portion of the radial carcass 5. A bead reinforcing layer (10) is provided along it.

【0044】実施例1 図1に従う外皮ゴム部であり、トレッドゴム層2の外側
部分を難燃ゴム組成物層L1 とするとともに、サイドゴ
ム層3の外側部分にL1 とは異なる同一の難燃ゴム組成
物層L2 、L3 を配した。(L3 は図示せず)。表1に
難燃ゴム組成物層の配合例を示す。また、表3に該配合
例を適用した難燃ゴム組成物層の各諸元を実施例2及び
実施例3とともに示した。尚、他の実施例、比較例及び
従来例とも外皮ゴム部の表面積は23000 cm2 であり、ま
た、外皮ゴム部重量は22 kg であった。
Example 1 In the outer rubber part according to FIG. 1, the outer part of the tread rubber layer 2 was made the flame-retardant rubber composition layer L 1, and the outer part of the side rubber layer 3 was made of the same material different from L 1. The fuel rubber composition layers L 2 and L 3 were arranged. (L 3 is not shown). Table 1 shows an example of the composition of the flame-retardant rubber composition layer. In addition, Table 3 shows each of the specifications of the flame-retardant rubber composition layer to which the formulation example is applied, together with Examples 2 and 3. In addition, the surface area of the outer rubber portion was 23000 cm 2 and the weight of the outer rubber portion was 22 kg in each of the other examples, the comparative examples and the conventional example.

【0045】実施例2 図2に従う外皮ゴム部を備え、トレッドゴム層2の外側
部分のみに難燃ゴム組成物層L1 を適用したゴムタイヤ
であり、同様に、表1に難燃ゴム組成物層の配合例を、
表3に難燃ゴム組成物層の諸元を示した。外皮ゴム部重
量は22kgであった。
Example 2 A rubber tire having an outer rubber part according to FIG. 2 and having a flame-retardant rubber composition layer L 1 applied only to the outer side portion of the tread rubber layer 2, and similarly, Table 1 shows the flame-retardant rubber composition. Example of layer composition
Table 3 shows the specifications of the flame-retardant rubber composition layer. The weight of the outer rubber part was 22 kg.

【0046】実施例3 実施例2同様、図2に従うトレッドゴム層2の外側部分
のみに難燃ゴム組成物層L1 を適用したゴムタイヤであ
り、表1に難燃ゴム組成物層の配合例を、表3に難燃ゴ
ム組成物層の諸元を示した。外皮ゴム部重量は22kgで
あった。
Example 3 Similar to Example 2, this is a rubber tire in which the flame-retardant rubber composition layer L 1 is applied only to the outer portion of the tread rubber layer 2 according to FIG. 2, and Table 1 shows an example of the composition of the flame-retardant rubber composition layer. Table 3 shows the specifications of the flame-retardant rubber composition layer. The weight of the outer rubber part was 22 kg.

【0047】比較例1、比較例2及び従来例のゴムタイ
ヤは外皮ゴム部を除く補強部は実施例と同一であり、そ
れぞれのゴム組成物層の配合例を表2に示した。また、
前記ゴム組成物の諸元を表4に示す。比較例2例と従来
例共に外皮ゴム部重量は22kgであった。
The rubber tires of Comparative Examples 1 and 2 and the conventional example have the same reinforcing portions as those of the example except for the outer rubber portion, and Table 2 shows the compounding examples of the respective rubber composition layers. Also,
Table 4 shows the specifications of the rubber composition. In both the comparative example 2 and the conventional example, the weight of the outer rubber part was 22 kg.

【0048】前記各実施例、比較例及び従来例のゴムタ
イヤそれぞれを標準リム8.50V−20に装着し、一旦標準
空気圧を充填しゴムタイヤをリムに十分定着させた後大
気圧に戻し、車両に装着したのと同様状態に軸を水平に
保ち、まず難燃性の程度を次の評価方法によりテストし
た。即ち、ブタンガスバーナーを用い、バーナーの火口
をゴムタイヤトレッドの下方約5cmの位置に固定し、火
炎温度約1000℃、火炎の高さ約10cm、幅約10cm、厚さ
約1cmの炎で15分間加熱した。この実験結果を表3及び
表4に示す。実施例全てが高い難燃性を有することが実
証された。
The rubber tires of the above-mentioned respective examples, comparative examples and conventional examples were mounted on the standard rim 8.50V-20, and once the standard tire pressure was filled and the rubber tires were sufficiently fixed on the rim and then returned to the atmospheric pressure and mounted on the vehicle. The shaft was kept horizontal in the same manner as described above, and the degree of flame retardancy was first tested by the following evaluation method. That is, using a butane gas burner, fix the burner crater at a position of about 5 cm below the rubber tire tread, and heat for 15 minutes with a flame temperature of about 1000 ° C, flame height of about 10 cm, width of about 10 cm, and thickness of about 1 cm. did. The results of this experiment are shown in Tables 3 and 4. It was demonstrated that all the examples have high flame retardancy.

【0049】また、前記各ゴムタイヤを実際の車両に装
着、走行させ、耐摩耗性並びに耐クラック性を、更に、
ドラム試験機により耐セパレーション性を評価した。こ
れらの結果を同じく表3と表4に示す。数値は従来例を
100 とした指数で示し、値は大なるほど良い。この結果
より、いづれの実施例も実用上全く支障のないタイヤ性
能が達成できたことが判る。
Further, the rubber tires are mounted on an actual vehicle and run to improve wear resistance and crack resistance.
The separation resistance was evaluated by a drum tester. The results are also shown in Tables 3 and 4. Numerical values are conventional examples
It is shown as an index with 100, and the larger the value, the better. From these results, it can be seen that the tire performance of any of the examples could be achieved without any practical problems.

【0050】[0050]

【表1】 [Table 1]

【0051】[0051]

【表2】 [Table 2]

【0052】[0052]

【表3】 [Table 3]

【0053】[0053]

【表4】 [Table 4]

【0054】前記した実施例のスチールコード補強のゴ
ムタイヤ以外に本発明は、有機または無機繊維コードを
用いたラジアルゴムタイヤに適用し得るのは勿論の事、
該繊維コード補強になるバイアスゴムタイヤ、及び、ゴ
ムタイヤ内部にウレタンゴム、その他のゴム等を充填、
挿入したパンク防止ゴムタイヤにも用いる事が出来る。
Besides the steel cord-reinforced rubber tires of the above-described examples, the present invention can be applied to radial rubber tires using organic or inorganic fiber cords.
Bias rubber tire for reinforcing the fiber cord, and urethane rubber, other rubber or the like filled inside the rubber tire,
It can also be used for inserted flat tires.

【0055】[0055]

【発明の効果】本発明によれば、電気車両その他各種車
両や航空機に使用されるゴムタイヤとして要求される耐
摩耗性、耐セパレーション性、耐クラック性等の基本性
能を損なうことなく、高温度で大きな熱容量を有する火
源に遭遇しても、極めて高度な難燃性を有するゴムタイ
ヤを提供できる。
EFFECTS OF THE INVENTION According to the present invention, the rubber tires used in electric vehicles and various other vehicles and aircraft can be operated at high temperatures without impairing the basic performance such as wear resistance, separation resistance and crack resistance. Even if a fire source having a large heat capacity is encountered, a rubber tire having extremely high flame retardancy can be provided.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に従う第一実施例のゴムタイヤの基本構
成を示す左半分の幅方向断面の説明図である。
FIG. 1 is an explanatory view of a left half width direction cross section showing a basic configuration of a rubber tire according to a first embodiment of the present invention.

【図2】本発明に従う第二実施例のゴムタイヤの基本構
成を示す左半分の幅方向断面の説明図である。
FIG. 2 is an explanatory diagram of a left half widthwise cross section showing a basic configuration of a rubber tire according to a second embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1 ゴムタイヤ 2 トレッドゴム層 3 サイドゴム層 4 ビード部 5 カーカス 6 ベルト 7 クッションゴム 8 スティフナーゴム 9 ビードコアー 10 ビード部補強層 11 溝 12 標準リム 13 フランジ L1 難燃ゴム組成物層 L2 難燃ゴム組成物層1 rubber tire 2 tread rubber layer 3 side rubber layer 4 bead part 5 carcass 6 belt 7 cushion rubber 8 stiffener rubber 9 bead core 10 bead part reinforcement layer 11 groove 12 standard rim 13 flange L 1 flame retardant rubber composition layer L 2 flame retardant rubber composition Physical layer

─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───

【手続補正書】[Procedure amendment]

【提出日】平成3年11月20日[Submission date] November 20, 1991

【手続補正1】[Procedure Amendment 1]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0052[Correction target item name] 0052

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0052】[0052]

【表3】 [Table 3]

【手続補正2】[Procedure Amendment 2]

【補正対象書類名】明細書[Document name to be amended] Statement

【補正対象項目名】0053[Correction target item name] 0053

【補正方法】変更[Correction method] Change

【補正内容】[Correction content]

【0053】[0053]

【表4】 [Table 4]

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 トレッドゴム層と、該ゴム層の両側に連
なり径方向内側に向かってビード部近傍まで延在するサ
イドゴム層とからなる外皮ゴム部と、該ゴム部の内側に
補強部とを備えたゴムタイヤにおいて、 表面を含む外皮ゴム部の少なくとも一部を一層以上の難
燃ゴム組成物層とするとともに、このゴム組成物層の酸
素指数(O.I.)を19.8以上とし、外皮ゴム部の全表
面積に対する該ゴム組成物層が占める表面積の比をS、
該ゴム組成物層の重量をV(kg) 、外皮ゴム部の全重量
(kg)に対する該ゴム組成物層の重量V(kg)の比をRとし
たとき、それぞれの難燃ゴム組成物層の(O.I.)×
S×V×Rの値の総和の絶対値をゴムタイヤの難燃度と
定義し、この難燃度を10以上としたことを特徴とする難
燃ゴムタイヤ。
1. A tread rubber layer, and an outer rubber layer including a side rubber layer that is continuous with both sides of the rubber layer and extends radially inward to the vicinity of the bead portion, and a reinforcing portion inside the rubber portion. In a provided rubber tire, at least a part of the outer rubber part including the surface is made into one or more flame-retardant rubber composition layers, and the oxygen index (O.I.) of this rubber composition layer is 19.8 or more, and the outer rubber The ratio of the surface area occupied by the rubber composition layer to the total surface area of the parts is S,
The weight of the rubber composition layer is V (kg), and the total weight of the outer rubber part
When the ratio of the weight V (kg) of the rubber composition layer to (kg) is R, (O.I.) × of each flame-retardant rubber composition layer
A flame-retardant rubber tire characterized in that the absolute value of the sum of the values of S × V × R is defined as the flame retardancy of the rubber tire, and the flame retardancy is 10 or more.
【請求項2】 標準リムに装着した後に外部に露出する
外皮ゴム部の全表面積に対する難燃ゴム組成物層が占め
る表面積の比Sの総和が少なくも0.30であり、外皮ゴム
部の全重量(kg)に対する該ゴム組成物層の重量V(kg)の
比Rが0.40以上である請求項1記載のゴムタイヤ。
2. The total ratio S of the surface area occupied by the flame-retardant rubber composition layer to the total surface area of the outer rubber portion exposed to the outside after mounting on the standard rim is at least 0.30, and the total weight of the outer rubber portion ( The rubber tire according to claim 1, wherein the ratio R of the weight V (kg) of the rubber composition layer to the (kg) is 0.40 or more.
JP3300606A 1991-11-14 1991-11-15 Fire-retardant rubber tire Pending JPH05139108A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
JP3300606A JPH05139108A (en) 1991-11-15 1991-11-15 Fire-retardant rubber tire
MX9206505A MX9206505A (en) 1991-11-14 1992-11-12 RUBBER TIRES THAT DELAY THE FLAME.
US07/974,519 US5341862A (en) 1991-11-14 1992-11-12 Flame-retardant rubber tires
CA002082857A CA2082857C (en) 1991-11-14 1992-11-13 Flame-retardant rubber tires
DE69212435T DE69212435T2 (en) 1991-11-14 1992-11-16 Flame retardant rubber tires
EP92310449A EP0542580B1 (en) 1991-11-14 1992-11-16 Flame-retardant rubber tires
ES92310449T ES2092061T3 (en) 1991-11-14 1992-11-16 RUBBER TIRES FOR FIRE PROTECTION.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3300606A JPH05139108A (en) 1991-11-15 1991-11-15 Fire-retardant rubber tire

Publications (1)

Publication Number Publication Date
JPH05139108A true JPH05139108A (en) 1993-06-08

Family

ID=17886878

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3300606A Pending JPH05139108A (en) 1991-11-14 1991-11-15 Fire-retardant rubber tire

Country Status (1)

Country Link
JP (1) JPH05139108A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7198426B2 (en) 2004-03-15 2007-04-03 Woo Jeon Green Co. Ltd. Prefabricated road median wall
JP2017082121A (en) * 2015-10-29 2017-05-18 横浜ゴム株式会社 Rubber composition for tire for heavy load

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7198426B2 (en) 2004-03-15 2007-04-03 Woo Jeon Green Co. Ltd. Prefabricated road median wall
JP2017082121A (en) * 2015-10-29 2017-05-18 横浜ゴム株式会社 Rubber composition for tire for heavy load

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