JP2002331806A - Pneumatic tire using thermoplastic elastomer coated steel cord - Google Patents
Pneumatic tire using thermoplastic elastomer coated steel cordInfo
- Publication number
- JP2002331806A JP2002331806A JP2001138684A JP2001138684A JP2002331806A JP 2002331806 A JP2002331806 A JP 2002331806A JP 2001138684 A JP2001138684 A JP 2001138684A JP 2001138684 A JP2001138684 A JP 2001138684A JP 2002331806 A JP2002331806 A JP 2002331806A
- Authority
- JP
- Japan
- Prior art keywords
- elastomer composition
- thermoplastic elastomer
- pneumatic tire
- steel cord
- thermoplastic
- 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.)
- Granted
Links
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B1/00—Constructional features of ropes or cables
- D07B1/06—Ropes or cables built-up from metal wires, e.g. of section wires around a hemp core
- D07B1/0606—Reinforcing cords for rubber or plastic articles
- D07B1/0666—Reinforcing cords for rubber or plastic articles the wires being characterised by an anti-corrosive or adhesion promoting coating
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2001—Wires or filaments
- D07B2201/201—Wires or filaments characterised by a coating
- D07B2201/2012—Wires or filaments characterised by a coating comprising polymers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2042—Strands characterised by a coating
- D07B2201/2044—Strands characterised by a coating comprising polymers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2003—Thermoplastics
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2205/00—Rope or cable materials
- D07B2205/20—Organic high polymers
- D07B2205/2075—Rubbers, i.e. elastomers
- D07B2205/2082—Rubbers, i.e. elastomers being of synthetic nature, e.g. chloroprene
Landscapes
- Ropes Or Cables (AREA)
- Tires In General (AREA)
- Reinforced Plastic Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は空気入りタイヤに関
し、更に詳しくは熱可塑性樹脂のマトリックス中にエラ
ストマー組成物を不連続相として分散せしめて成る熱可
塑性エラストマーでスチールワイヤーを被覆したスチー
ルコードをタイヤの、特にタイヤのベルト部又はカーカ
ス部の、補強材として用いた空気入りタイヤに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pneumatic tire, and more particularly, to a tire having a steel cord coated with a thermoplastic elastomer obtained by dispersing an elastomer composition as a discontinuous phase in a matrix of a thermoplastic resin. And more particularly to a pneumatic tire used as a reinforcing material for a belt portion or a carcass portion of a tire.
【０００２】[0002]
【従来の技術】電線、ワイヤーロープなどの金属線を樹
脂またはゴムでコーティングする技術は数多くあるが、
樹脂でコーティングしたものは、防食性には優れるもの
の柔軟性に欠け、特に動的疲労性が劣るという問題があ
る。一方、ゴムでコーティングしたものは柔軟性に富
み、動的疲労性には優れるが、防食性に欠けるという問
題がある。2. Description of the Related Art There are many techniques for coating metal wires such as electric wires and wire ropes with resin or rubber.
Those coated with a resin have a problem in that they are excellent in anticorrosion, but lack flexibility, and particularly inferior in dynamic fatigue resistance. On the other hand, those coated with rubber are rich in flexibility and excellent in dynamic fatigue resistance, but have a problem that they lack corrosion resistance.
【０００３】[0003]
【発明が解決しようとする課題】従って、本発明は、防
食性、柔軟性及び耐動的疲労特性に優れた熱可塑性エラ
ストマー被覆スチールコードをタイヤ補強材として用い
た空気入りタイヤを提供することを目的とする。Accordingly, an object of the present invention is to provide a pneumatic tire using a thermoplastic elastomer-coated steel cord excellent in corrosion resistance, flexibility and dynamic fatigue resistance as a tire reinforcing material. And
【０００４】[0004]
【課題を解決するための手段】本発明に従えば、熱可塑
性樹脂のマトリックス中にエラストマー組成物を不連続
相として分散せしめてなる熱可塑性エラストマー組成物
でスチールワイヤーを被覆してなるスチールコードをタ
イヤ補強材として用いた空気入りタイヤが提供される。According to the present invention, there is provided a steel cord obtained by coating a steel wire with a thermoplastic elastomer composition obtained by dispersing an elastomer composition as a discontinuous phase in a matrix of a thermoplastic resin. A pneumatic tire used as a tire reinforcing material is provided.
【０００５】[0005]
【発明の実施の形態】本発明によれば、前述の如く、空
気入りタイヤにタイヤ補強材として使用されるスチール
コードとして、熱可塑性樹脂のマトリックス中にエラス
トマー組成物を不連続相として分散せしめてなる熱可塑
性エラストマー組成物（以下、単に「熱可塑性エラスト
マー組成物」という）で、スチールワイヤーを被覆して
なる熱可塑性エラストマー組成物被覆スチールコードを
用いるので、耐食性に優れ、柔軟性が良好で動的疲労性
に優れ、且つ、高い防湿性を有し、低透過性及び耐屈曲
性能に優れた複合材としてのスチールコードが得られ
る。According to the present invention, as described above, a steel cord used as a tire reinforcing material for a pneumatic tire is obtained by dispersing an elastomer composition as a discontinuous phase in a thermoplastic resin matrix. Since the thermoplastic elastomer composition (hereinafter simply referred to as “thermoplastic elastomer composition”) uses a steel cord coated with a thermoplastic elastomer composition formed by coating a steel wire, it has excellent corrosion resistance, excellent flexibility, and excellent dynamic performance. A steel cord as a composite material having excellent mechanical fatigue, high moisture resistance, low permeability and excellent bending resistance can be obtained.
【０００６】本発明に係る空気入りタイヤに用いられる
スチールコードは、一般的なスチールコード用スチール
ワイヤーを前記熱可塑性エラストマー組成物で被覆す
る。このような熱可塑性エラストマー組成物は、前述の
如く、熱可塑性樹脂のマトリックス中にエラストマー組
成物が不連続相として分散せしめたものである。この際
の熱可塑性樹脂とエラストマー組成物との配合比率には
特に限定はないが好ましくは熱可塑性樹脂１００重量部
に対し、エラストマー組成物２０〜３００重量部、更に
好ましくは１００〜２５０重量部である。エラストマー
組成物の量が多過ぎると、他の条件にもよるが、水蒸気
透過性に劣り、スチールワイヤーが腐食してしまうおそ
れがあり、逆に少な過ぎると熱可塑性エラストマー組成
物の硬度が高くなりすぎ、タイヤの動的疲労性が低下す
るおそれがある。[0006] The steel cord used for the pneumatic tire according to the present invention is obtained by coating a general steel wire for a steel cord with the thermoplastic elastomer composition. As described above, such a thermoplastic elastomer composition is one in which the elastomer composition is dispersed as a discontinuous phase in a matrix of a thermoplastic resin. The mixing ratio of the thermoplastic resin and the elastomer composition at this time is not particularly limited, but is preferably 20 to 300 parts by weight of the elastomer composition, more preferably 100 to 250 parts by weight with respect to 100 parts by weight of the thermoplastic resin. is there. If the amount of the elastomer composition is too large, depending on other conditions, the water vapor permeability is inferior, and the steel wire may be corroded.If the amount is too small, the hardness of the thermoplastic elastomer composition increases. Too much, and the dynamic fatigue properties of the tire may be reduced.
【０００７】本発明において使用する熱可塑性エラスト
マー組成物を構成する熱可塑性樹脂としては、水蒸気透
過率が７０×１０-13cm3・cm／cm2 ・ｓ・Pa以下、好ま
しくは４０cm3・cm／cm2 ・ｓ・Pa以下であるものが好
ましい。The thermoplastic resin constituting the thermoplastic elastomer composition used in the present invention has a water vapor transmission rate of 70 × 10 −13 cm 3 · cm / cm 2 · s · Pa or less, preferably 40 cm 3 · cm. / Cm 2 · s · Pa or less is preferred.
【０００８】本発明の熱可塑性エラストマー組成物を構
成する熱可塑性樹脂としては、例えばポリオレフィン系
樹脂（例えば高密度ポリエチレン（ＨＤＰＥ）、低密度
ポリエチレン（ＬＤＰＥ）、超高分子量ポリエチレン
（ＵＨＭＷＰＥ）、アイソタクチックポリプロピレン、
シンジオタクチックポリプロピレン、エチレンプロピレ
ン共重合体樹脂）；ポリアミド系樹脂（例えばナイロン
６（Ｎ６）、ナイロン６６（Ｎ６６）、ナイロン４６
（Ｎ４６）、ナイロン１１（Ｎ１１）、ナイロン１２
（Ｎ１２）、ナイロン６１０（Ｎ６１０）、ナイロン６
１２（Ｎ６１２）、ナイロン６／６６共重合体（Ｎ６／
６６）、ナイロン６／６６／６１０共重合体（Ｎ６／６
６／６１０）、ナイロンＭＸＤ６（ＭＸＤ６）、ナイロ
ン６Ｔ、ナイロン６／６Ｔ共重合体、ナイロン６６／Ｐ
Ｐ共重合体、ナイロン６６／ＰＰＳ共重合体）；ポリエ
ステル系樹脂（例えばポリブチレンテレフタレート（Ｐ
ＢＴ）、ポリエチレンテレフタレート（ＰＥＴ）などの
芳香族ポリエステル）；ポリエーテル系樹脂（例えばポ
リフェニレンオキシド（ＰＰＯ）、変性ポリフェニレン
オキシド（変性ＰＰＯ）、ポリサルフォン（ＰＳＦ）、
ポリエーテルエーテルケトン（ＰＥＥＫ））；ポリメタ
クリレート系樹脂（例えばポリメタクリル酸メチル（Ｐ
ＭＭＡ）、ポリメタクリル酸エチル）；ポリビニル系樹
脂（例えばビニルアルコール／エチレン共重合体（ＥＶ
ＯＨ）、ポリ塩化ビニリデン（ＰＶＤＣ）、塩化ビニリ
デン／メチルアクリレート共重合体）；フッ素系樹脂
（例えばポリフッ化ビニリデン（ＰＶＤＦ）、ポリクロ
ルフルオロエチレン（ＰＣＴＦＥ））、ポリアクリロニ
トリル樹脂（ＰＡＮ）などを挙げることができる。The thermoplastic resin constituting the thermoplastic elastomer composition of the present invention includes, for example, polyolefin resins (for example, high density polyethylene (HDPE), low density polyethylene (LDPE), ultra high molecular weight polyethylene (UHMWPE), isotactic Tic polypropylene,
Syndiotactic polypropylene, ethylene propylene copolymer resin); polyamide resin (for example, nylon 6 (N6), nylon 66 (N66), nylon 46)
(N46), nylon 11 (N11), nylon 12
(N12), nylon 610 (N610), nylon 6
12 (N612), nylon 6/66 copolymer (N6 /
66), nylon 6/66/610 copolymer (N6 / 6
6/610), nylon MXD6 (MXD6), nylon 6T, nylon 6 / 6T copolymer, nylon 66 / P
P copolymer, nylon 66 / PPS copolymer); polyester resin (for example, polybutylene terephthalate (P
BT), aromatic polyesters such as polyethylene terephthalate (PET)); polyether resins (eg, polyphenylene oxide (PPO), modified polyphenylene oxide (modified PPO), polysulfone (PSF),
Polyetheretherketone (PEEK)); polymethacrylate-based resin (for example, polymethyl methacrylate (P
MMA), polyethyl methacrylate); polyvinyl resin (eg, vinyl alcohol / ethylene copolymer (EV)
OH), polyvinylidene chloride (PVDC), vinylidene chloride / methyl acrylate copolymer); fluorinated resins (for example, polyvinylidene fluoride (PVDF), polychlorofluoroethylene (PCTFE)), and polyacrylonitrile resin (PAN). be able to.
【０００９】各代表的な熱可塑性樹脂のヤング率及び水
蒸気透過率の曲型的な値を以下の表Ｉに示す。The curved values of Young's modulus and water vapor permeability of each representative thermoplastic resin are shown in Table I below.
【００１０】[0010]
【表１】 [Table 1]
【００１１】本発明の熱可塑性エラストマー組成物を構
成するエラストマー組成物としては、水蒸気透過率が７
００×１０-13cm3・cm／cm2 ・ｓ・Pa以下、更に好まし
くは３００×１０-13 cm3・cm／cm2 ・ｓ・Pa以下であ
るのが好ましい。The elastomer composition constituting the thermoplastic elastomer composition of the present invention has a water vapor transmission rate of 7
It is preferably at most 00 × 10 -13 cm 3 · cm / cm 2 · s · Pa, more preferably at most 300 × 10 -13 cm 3 · cm / cm 2 · s · Pa.
【００１２】本発明において使用する熱可塑性エラスト
マー組成物を構成するエラストマー組成物としては、例
えば環化ＮＲ、エチレンプロピレンゴム（ＥＰＤＭ、Ｅ
ＰＭ）、ポリイソブチレン、ＩＩＲ、Ｂｒ−ＩＩＲ、Ｃ
Ｉ−ＩＩＲ、パラメチルスチレンとポリイソブチレンの
共重合体のハロゲン化物（Ｘ−ＩＰＭＳ）、エチレン・
酢酸ビニルゴム（ＥＶＡ）、塩素化ポリエチレン、クロ
ロスルフォン化ポリエチレン、アクリロニトリルブタジ
エンゴムおよびその水添物、ヒドリンゴムなどが挙げら
れる。これらの中でも、樹脂との混練時の耐熱性、低水
蒸気透過性、架橋反応性の観点から、エチレンプロピレ
ンゴム、ＩＩＲ、Ｂｒ−ＩＩＲ、Ｘ−ＩＰＭＳが好まし
い。The elastomer composition constituting the thermoplastic elastomer composition used in the present invention includes, for example, cyclized NR, ethylene propylene rubber (EPDM, EDM).
PM), polyisobutylene, IIR, Br-IIR, C
I-IIR, a halide of a copolymer of paramethylstyrene and polyisobutylene (X-IPMS), ethylene
Examples include vinyl acetate rubber (EVA), chlorinated polyethylene, chlorosulfonated polyethylene, acrylonitrile butadiene rubber and hydrogenated products thereof, and hydrin rubber. Among these, ethylene propylene rubber, IIR, Br-IIR, and X-IPMS are preferable from the viewpoints of heat resistance during kneading with a resin, low water vapor permeability, and crosslinking reactivity.
【００１３】[0013]
【表２】 [Table 2]
【００１４】上述の特定の熱可塑性樹脂とエラストマー
組成物との化学的相溶性が異なる場合には、第３成分と
して適当な相溶化剤を用いて両者を相溶化させるのが好
ましい。系に相溶化剤を混合することにより、熱可塑性
樹脂とエラストマー組成物との界面張力が低下し、その
結果、分散相を形成しているエラストマー組成物の粒子
径が微細になることから両組成物の特性はより有効に発
現されることになる。この相溶化剤としては、一般的に
樹脂成分、エラストマー成分の両方または片方の構造を
有する共重合体、あるいは樹脂成分またはエラストマー
成分と反応可能なエポキシ基、カルボキシル基、カルボ
ニル基、ハロゲン基、アミノ基、オキサゾリン基、水酸
基等を有した共重合体の構造を有するものが挙げられ
る。これらは混合される樹脂成分とエラストマー成分の
種類によって選定することができる。When the above-mentioned specific thermoplastic resin and the elastomer composition have different chemical compatibility, it is preferable to use a suitable compatibilizing agent as the third component to compatibilize the two. By mixing the compatibilizing agent into the system, the interfacial tension between the thermoplastic resin and the elastomer composition is reduced, and as a result, the particle size of the elastomer composition forming the dispersed phase becomes fine, so that both the components are dispersed. The properties of the object will be more effectively expressed. As the compatibilizer, generally, a copolymer having a structure of both or one of the resin component and the elastomer component, or an epoxy group, a carboxyl group, a carbonyl group, a halogen group, an amino group capable of reacting with the resin component or the elastomer component. Having a structure of a copolymer having a group, an oxazoline group, a hydroxyl group and the like. These can be selected according to the types of the resin component and the elastomer component to be mixed.
【００１５】汎用のものとして、スチレン・エチレン・
ブチレン・スチレン系ブロック共重合体（ＳＥＢＳ）お
よびそのマレイン酸変性物、ＥＰＤＭ、ＥＰＭおよびそ
れらのマレイン酸変性物、ＥＰＤＭ／スチレンまたはＥ
ＰＤＭ／アクリロニトリルグラフト共重合体およびその
マレイン酸変性物、スチレン／マレイン酸共重合体、反
応性フェノキシン等を挙げることができる。[0015] Styrene, ethylene,
Butylene / styrene block copolymer (SEBS) and its maleic acid modified product, EPDM, EPM and their maleic acid modified product, EPDM / styrene or E
Examples include a PDM / acrylonitrile graft copolymer and its maleic acid-modified product, a styrene / maleic acid copolymer, and a reactive phenoxine.
【００１６】熱可塑性エラストマー組成物に相溶化剤を
配合する場合、その配合量には特に限定はなく、好まし
くはポリマー成分（熱可塑性樹脂とエラストマー組成物
との総和）１００重量部に対して０．５〜２０重量部の
割合となる量である。When the compatibilizer is blended with the thermoplastic elastomer composition, the blending amount is not particularly limited, and is preferably 0 to 100 parts by weight of the polymer component (total of the thermoplastic resin and the elastomer composition). It is an amount corresponding to a ratio of 0.5 to 20 parts by weight.
【００１７】本発明で用いる熱可塑性エラストマー組成
物の構成成分は、例えば前記した通り熱可塑性樹脂とエ
ラストマー組成物であり、かかる熱可塑性エラストマー
組成物は、それを構成するエラストマー組成物の少なく
とも一部が架橋されている事が好ましい。かかる熱可塑
性エラストマー組成物は、通常、バンバリーミキサー、
ブラベンダーミキサーまたはその他の混練押出機（２軸
混練押出機）等を使用し、例えば前記熱可塑性樹脂を溶
融状態でこれらの装置内に維持し、エラストマー相を微
細に混練分散させつつ、更に加硫剤（架橋剤）を添加し
て、エラストマー相の架橋が完了するまで、架橋を促進
する温度で混練することによって製造することができ
る。The components of the thermoplastic elastomer composition used in the present invention are, for example, a thermoplastic resin and an elastomer composition as described above, and such a thermoplastic elastomer composition is at least a part of the elastomer composition constituting the thermoplastic elastomer composition. Are preferably crosslinked. Such a thermoplastic elastomer composition is usually a Banbury mixer,
Using a Brabender mixer or other kneading extruder (biaxial kneading extruder) or the like, for example, the thermoplastic resin is maintained in a molten state in these devices, and the elastomer phase is further kneaded and dispersed while being kneaded and dispersed. It can be manufactured by adding a sulfurizing agent (crosslinking agent) and kneading at a temperature that promotes crosslinking until the crosslinking of the elastomer phase is completed.
【００１８】すなわち、このように製造される熱可塑性
エラストマー組成物は、熱可塑性樹脂を素練りをしなが
らエラストマーの加硫を進行させる、いわば、動的に加
硫を進行させる動的加硫（Dynamic CureまたはDynamic
Vulcanization)により製造される熱可塑性エラストマー
組成物である。このような製法を利用することにより、
得られた熱可塑性エラストマー組成物は、連続相となる
熱可塑性樹脂相に不連続相となる加硫ゴム相が微細に分
散した状態となるため、この熱可塑性エラストマー組成
物は加硫ゴムと同様の挙動を示し、かつ、少なくとも連
続相が熱可塑性樹脂相であるため、その成形加工に際し
ては、熱可塑性樹脂に準じた加工が可能である。That is, the thermoplastic elastomer composition produced in this manner is capable of undergoing vulcanization of an elastomer while masticating a thermoplastic resin, that is, dynamic vulcanization (ie, dynamic vulcanization). Dynamic Cure or Dynamic
Vulcanization). By using such a manufacturing method,
Since the obtained thermoplastic elastomer composition is in a state where the vulcanized rubber phase that becomes the discontinuous phase is finely dispersed in the thermoplastic resin phase that becomes the continuous phase, this thermoplastic elastomer composition is similar to the vulcanized rubber. , And at least the continuous phase is a thermoplastic resin phase. Therefore, at the time of molding, processing according to the thermoplastic resin is possible.
【００１９】このような熱可塑性エラストマー組成物
は、熱可塑性樹脂が連続相、エラストマー組成物が不連
続相として構成され、不連続相である加硫ゴム組成物の
粒子径が５０μｍ以下であるのが好ましく、さらに、１
０〜０．１μｍであるのがより好ましい。In such a thermoplastic elastomer composition, the thermoplastic resin is constituted as a continuous phase and the elastomer composition is constituted as a discontinuous phase, and the particle diameter of the vulcanized rubber composition as the discontinuous phase is 50 μm or less. Is preferable, and 1
More preferably, it is 0 to 0.1 μm.
【００２０】なお、混練条件や使用する加硫剤の種類、
量や加硫条件（温度等）等は、添加するエラストマー組
成物の配合、エラストマー組成物の配合量に応じて適宜
決定すればよく、特に限定はされない。The kneading conditions, the type of vulcanizing agent used,
The amount, vulcanization conditions (temperature, etc.) and the like may be appropriately determined depending on the blending of the elastomer composition to be added and the blending amount of the elastomer composition, and are not particularly limited.
【００２１】本発明の熱可塑性エラストマー組成物は、
前述の通り、まず、樹脂、エラストマー組成物を添加
し、溶融混練し、次いで、混練下で加硫剤を添加し、エ
ラストマー組成物を動的に加硫させることにより行うこ
とが出来る。The thermoplastic elastomer composition of the present invention comprises:
As described above, it can be carried out by first adding a resin and an elastomer composition, melt-kneading, then adding a vulcanizing agent under kneading, and dynamically vulcanizing the elastomer composition.
【００２２】また、本発明の熱可塑性エラストマー組成
物には必要に応じて補強剤、軟化剤、老化防止剤等の配
合剤を添加してもよい。エラストマー成分への配合剤は
上記混練中に添加してもよいが、加硫剤以外の配合剤は
上記混練の前に予め混合しておくのがよい。樹脂成分へ
の配合剤は、上記混練の前に予め混合しておいてもよ
く、また、上記混練中に添加してもよい。The thermoplastic elastomer composition of the present invention may optionally contain additives such as a reinforcing agent, a softening agent, and an antioxidant. The compounding agent for the elastomer component may be added during the kneading, but the compounding agent other than the vulcanizing agent is preferably mixed in advance before the kneading. The compounding agent for the resin component may be mixed before the kneading, or may be added during the kneading.
【００２３】本発明の熱可塑性エラストマー組成物の製
造に使用する混練機には、特に限定はないが、前述の如
く、スクリュ押出機、ニーダ、バンバリミキサー、２軸
混練押出機等が挙げられる。中でも樹脂成分とエラスト
マー成分の混練およびエラストマー成分の動的加硫を考
慮すると、２軸混練押出機を使用するのが好ましい。さ
らに、２種類以上の混練機を使用し、順次混練してもよ
い。The kneading machine used for producing the thermoplastic elastomer composition of the present invention is not particularly limited, but includes a screw extruder, a kneader, a Banbury mixer, a twin-screw kneading extruder and the like as described above. Among them, it is preferable to use a twin-screw kneading extruder in consideration of kneading of the resin component and the elastomer component and dynamic vulcanization of the elastomer component. Furthermore, you may knead sequentially using two or more types of kneaders.
【００２４】溶融混練の条件としては、混練温度は、例
えば１８０〜３５０℃、特に、１８０〜３００℃である
のが好ましいが、熱可塑性樹脂成分が溶融する温度以上
であれば特に限定はされない。混練時の剪断速度は、好
ましくは、５００〜８０００秒-1、特に好ましくは、１
０００〜５０００秒-1である。The conditions for the melt-kneading are, for example, a kneading temperature of, for example, 180 to 350 ° C., preferably 180 to 300 ° C., but there is no particular limitation so long as the temperature is at or above the melting temperature of the thermoplastic resin component. The shear rate during kneading is preferably from 500 to 8000 sec -1 , particularly preferably 1 to
000-5000 sec- 1 .
【００２５】溶融混練全体の滞留時間は、３０秒〜１０
分、加硫剤を添加した後の滞留時間（加硫時間）は、１
５秒〜５分であるのが好ましい。剪断速度は、スクリュ
の先端が描く円の円周に、スクリュの１秒間の回転数を
掛けて得られる積を先端の間隙で除して計算される。す
なわち、剪断速度は、先端の間隙で先端の速度を割った
値である。The residence time of the entire melt kneading is from 30 seconds to 10 seconds.
And the residence time (vulcanization time) after adding the vulcanizing agent is 1
It is preferably from 5 seconds to 5 minutes. The shear rate is calculated by dividing the product obtained by multiplying the circumference of the circle drawn by the screw tip by the number of rotations of the screw for one second by the gap at the tip. That is, the shear rate is a value obtained by dividing the tip speed by the tip gap.
【００２６】本発明に従ってスチールワイヤーを熱可塑
性エラストマー組成物と被覆する方法としては、例えば
プルトルージョン法、押出しインシェレーション法など
を用いることができる。As a method for coating the steel wire with the thermoplastic elastomer composition according to the present invention, for example, a pultrusion method, an extrusion insulation method, or the like can be used.
【００２７】上述のようにして得られた熱可塑性エラス
トマー組成物被覆スチールワイヤーは、例えば空気入り
タイヤのベルト部やカーカス部の補強用タイヤコードと
して、常法に従って、空気入りタイヤの製造に使用する
ことができる。The thermoplastic elastomer composition-coated steel wire obtained as described above is used, for example, as a tire cord for reinforcing a belt portion or a carcass portion of a pneumatic tire in the manufacture of a pneumatic tire according to a conventional method. be able to.
【００２８】[0028]
【実施例】以下、実施例によって本発明を更に説明する
が、本発明の範囲をこれらの実施例に限定するものでな
いことは言うまでもない。EXAMPLES Hereinafter, the present invention will be further described with reference to Examples, but it goes without saying that the scope of the present invention is not limited to these Examples.
【００２９】実施例１〜４及び比較例１〜３ 熱可塑性エラストマー組成物の調整 表IVで示されるエラストマー成分１〜３を密閉式バンバ
リミキサーにて初期温度４０℃で３分混合し、エラスト
マー組成物を調整し、ロールでシール化した後、ゴム用
ペレタイザーでペレット化した。次いで、表III に示す
配合で、樹脂ペレットとエラストマー組成物ペレットを
２軸混練機に投与し、混練温度２００〜２６０℃、せん
断速度１０００ｓ-1で、熱可塑性エラストマー組成物を
作製した。各熱可塑性エラストマー組成物を直径０．２
８mmのワイヤー３本をよって作製したスチールコード上
に、押出機を通して温度２４０℃で０．５mm厚に被覆し
た。 Examples 1-4 and Comparative Examples 1-3 Preparation of Thermoplastic Elastomer Compositions Elastomer components 1 to 3 shown in Table IV were mixed at an initial temperature of 40 ° C. for 3 minutes in a closed Banbury mixer to obtain an elastomer composition. The product was prepared, sealed with a roll, and then pelletized with a rubber pelletizer. Next, the resin pellets and the elastomer composition pellets having the composition shown in Table III were injected into a twin-screw kneader to prepare a thermoplastic elastomer composition at a kneading temperature of 200 to 260 ° C. and a shear rate of 1000 s −1 . Each thermoplastic elastomer composition has a diameter of 0.2
Three 8 mm wires were coated on a prepared steel cord through an extruder at a temperature of 240 ° C. to a thickness of 0.5 mm.
【００３０】[0030]
【表３】 [Table 3]
【００３１】[0031]
【表４】 [Table 4]
【００３２】このようにして得られた熱可塑性エラスト
マー組成物被覆スチールコードについて以下の評価試験
を行なった。結果は表III に示す。The following evaluation tests were carried out on the steel cords coated with the thermoplastic elastomer composition thus obtained. The results are shown in Table III.
【００３３】１）腐食試験 上記各被覆スチールコードを７０℃及び相対温度９５％
の湿熱オーブン中に入れ、１ヶ月放置した後、取り出し
て、スチールコードの腐食状態を観察した。結果は表II
I に示す。 1) Corrosion test Each of the above coated steel cords was subjected to 70 ° C. and a relative temperature of 95%.
The steel cord was placed in a moist heat oven, left for one month and then taken out to observe the corrosion state of the steel cord. Results are in Table II
Shown in I.
【００３４】２）曲げ試験 上記各被覆スチールコードをＲ＝１０mmで折り曲げ、そ
の際のコート樹脂の外観を目視で観察した。結果は表II
I に示す。 2) Bending Test Each of the above coated steel cords was bent at R = 10 mm, and the appearance of the coated resin at that time was visually observed. Results are in Table II
Shown in I.
【００３５】[0035]
【発明の効果】以上の通り、特に表III の結果に示すよ
うに、本発明に従って、熱可塑性エラストマー組成物を
被覆したスチールコードは実施例１〜５に示すように良
好な腐食及び曲げ試験結果が得られているのに対し、熱
可塑性樹脂のみを被覆した比較例１及び２では曲げ試験
結果に問題があり、エラストマーのみを被覆した比較例
３および比較例４のように耐水蒸気透過性の悪いエラス
トマーを使用して作製した熱可塑性エラストマー組成物
を被覆材として使った場合には、耐腐食性に問題があっ
た。As described above, the steel cord coated with the thermoplastic elastomer composition according to the present invention has good corrosion and bending test results as shown in Examples 1 to 5, especially as shown in the results of Table III. On the other hand, in Comparative Examples 1 and 2 in which only the thermoplastic resin was coated, there was a problem in the bending test results. When a thermoplastic elastomer composition produced using a bad elastomer was used as a coating material, there was a problem in corrosion resistance.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ０８Ｌ 101/00 Ｃ０８Ｌ 101/00 Ｄ０７Ｂ 1/06 Ｄ０７Ｂ 1/06 Ａ 1/16 1/16 Ｆターム(参考） 3B153 AA06 AA45 CC13 CC16 CC19 CC21 CC22 CC29 CC31 CC52 FF16 GG07 4F072 AA01 AA08 AB11 AD02 AD03 AD04 AD06 AD07 AD09 AD37 AD42 AD44 AD46 AK16 AK17 AL18 4J002 AA001 AC072 BB031 BB062 BB121 BB151 BB152 BB182 BB242 BB272 BD101 BD141 BE031 BG051 BG101 CF001 CF061 CF071 CH001 CH071 CH091 CL001 CL011 CL031 CL051 CL061 CN031 GN01──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C08L 101/00 C08L 101/00 D07B 1/06 D07B 1/06 A 1/16 1/16 F term (reference 3B153 AA06 AA45 CC13 CC16 CC19 CC21 CC22 CC29 CC31 CC52 FF16 GG07 4F072 AA01 AA08 AB11 AD02 AD03 AD04 AD06 AD07 AD09 AD37 AD42 AD44 AD46 AK16 AK17 AL18 4J002 AA001 AC072 BB031 BB061 BB101 BB101 BB101 BB101 BB101 BB101 BB151 CH001 CH071 CH091 CL001 CL011 CL031 CL051 CL061 CN031 GN01
Claims (2)
トマー組成物を不連続相として分散せしめてなる熱可塑
性エラストマー組成物でスチールワイヤーを被覆してな
るスチールコードをタイヤ補強材として用いた空気入り
タイヤ。1. A pneumatic tire using, as a tire reinforcing material, a steel cord obtained by coating a steel wire with a thermoplastic elastomer composition obtained by dispersing an elastomer composition as a discontinuous phase in a matrix of a thermoplastic resin.
が水蒸気透過率が７０×１０-13cm3・cm／cm2 ・ｓ・Pa
以下の熱可塑性樹脂成分と、水蒸気透過率が７００×１
０-13cm3・cm／cm2 ・ｓ・Pa以下のエラストマー成分と
からなり、水蒸気透過率が８０×１０-13cm3・cm／cm2
・ｓ・Pa以下でヤング率が１００MPa以下である請求項
１に記載の空気入りタイヤ。2. The thermoplastic elastomer composition according to claim 1, which has a water vapor transmission rate of 70 × 10 −13 cm 3 · cm / cm 2 · s · Pa.
The following thermoplastic resin component and a water vapor transmission rate of 700 × 1
It consists of an elastomer component of 0 -13 cm 3 · cm / cm 2 · s · Pa or less and has a water vapor transmission rate of 80 × 10 -13 cm 3 · cm / cm 2.
The pneumatic tire according to claim 1, wherein the Young's modulus is 100 MPa or less at s · Pa or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001138684A JP4465916B2 (en) | 2001-05-09 | 2001-05-09 | Pneumatic tire using thermoplastic elastomer-coated steel cord |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001138684A JP4465916B2 (en) | 2001-05-09 | 2001-05-09 | Pneumatic tire using thermoplastic elastomer-coated steel cord |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002331806A true JP2002331806A (en) | 2002-11-19 |
| JP4465916B2 JP4465916B2 (en) | 2010-05-26 |
Family
ID=18985580
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001138684A Expired - Fee Related JP4465916B2 (en) | 2001-05-09 | 2001-05-09 | Pneumatic tire using thermoplastic elastomer-coated steel cord |
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| Country | Link |
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