JPWO2014017486A1 - インナーライナー用積層体およびそれを用いたタイヤ - Google Patents
インナーライナー用積層体およびそれを用いたタイヤ Download PDFInfo
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Abstract
Description
前記ゴム層が少なくともジエン系エラストマーを含有し、該ジエン系エラストマーが、前記樹脂材料と親和性を有する官能基を含む化合物で変性されてなり、かつ、該ゴム層のうちの少なくとも1層が、架橋剤を含有することを特徴とするものである。
図1に、本発明のインナーライナー用積層体の模式的断面図を示す。図示するように、本発明のインナーライナー用積層体は、ガスバリア層1と、その両面にそれぞれ配置されたゴム層2A,2Bとからなる。
<実施例1>
まず、加圧反応槽に、エチレン含量44モル%、ケン化度99.9%のエチレン−ビニルアルコール共重合体(EVOH)(190℃、2160g荷重下でのMFR:5.5g/10分)2質量部およびN−メチル−2−ピロリドン8質量部を仕込み、120℃で2時間加熱撹拌して、EVOHを完全に溶解させた。これに、エポキシ化合物としてのエポキシプロパン0.4質量部を添加後、160℃で4時間加熱した。加熱終了後、蒸留水100質量部に析出させ、多量の蒸留水で充分にN−メチル−2−ピロリドンおよび未反応のエポキシプロパンを洗浄し、変性EVOHを得た。
得られたペレットを用い、東洋精機(株)製の二軸押出機によって、下記押出条件で製膜し、厚さ20μmの単層フィルムを作製した。次に、このフィルムを用いて、幅15mmの短冊状の試験片を作製し、23℃、50%RHの条件下で恒温室内に1週間放置した後、(株)島津製作所製のオートグラフ[AG−A500型]を用いて、チャック間隔50mm、引張速度50mm/分の条件で、23℃、50%RHにおけるS−Sカーブ(応力−歪み曲線)を測定し、S−Sカーブの初期傾きからヤング率を求めた。
シリンダー、ダイ温度設定:C1/C2/C3/ダイ=200/200/200/200(℃)
(柔軟樹脂の合成)
無水マレイン酸変性水素添加スチレン−エチレン−ブタジエン−スチレンブロック共重合体を公知の方法により合成し、ペレット化した。得られた無水マレイン酸変性水素添加スチレン−エチレン−ブタジエン−スチレンブロック共重合体は、23℃におけるヤング率が3MPa、スチレン含量が20%、無水マレイン酸量が0.3meq/gであった。なお、ヤング率は、上記変性EVOHと同様の方法で測定した。
上記変性EVOHおよび柔軟樹脂を二軸押出機で混練し、樹脂組成物を調製した。ここで、樹脂組成物中の柔軟樹脂の含有率は20質量%であった。また、樹脂組成物中の柔軟樹脂の平均粒径は、得られた樹脂組成物の試料を凍結した後、この試料をミクロトームにより切片にして透過電子顕微鏡で測定したところ、1.2μmであった。さらに、設定温度を−20℃に変更した以外は、上記変性EVOHのヤング率の測定方法と同様にして、この樹脂組成物の−20℃におけるヤング率を測定したところ、750MPaであった。
各樹脂の押出機仕様:
熱可塑性ポリウレタン:25mmφ押出機P25−18AC(大阪精機工作(株)製),
樹脂組成物(C):20mmφ押出機ラボ機ME型CO−EXT(東洋精機(株)製),
Tダイ仕様:500mm幅2種5層用((株)プラスチック工学研究所製)
冷却ロールの温度:50℃
引き取り速度:4m/分
多層フィルムの種類、多層フィルムの両側に配置するゴムシートに用いるゴム組成物の種類および厚みを、それぞれ下記の表2,3中に示すように変えた以外は実施例1等と同様にして、実施例3〜9および比較例1のインナーライナーを作製した。
2A,2B ゴム層
11 トレッド部
12 サイドウォール部
13 ビード部
14 ビードコア
15 カーカス
16 ベルト層
17 インナーライナー
Claims (14)
- 熱可塑性樹脂からなるか、または、熱可塑性樹脂と熱可塑性エラストマーとの混合物からなる樹脂材料よりなるガスバリア層と、該ガスバリア層の両面にそれぞれ配置されたゴム層とからなるインナーライナー用積層体であって、
前記ゴム層が少なくともジエン系エラストマーを含有し、該ジエン系エラストマーが、前記樹脂材料と親和性を有する官能基を含む化合物で変性されてなり、かつ、該ゴム層のうちの少なくとも1層が、架橋剤を含有することを特徴とするインナーライナー用積層体。 - 前記化合物が、酸素、窒素およびケイ素のうちのいずれかを有する請求項1記載のインナーライナー用積層体。
- 前記官能基が、エポキシ基、無水マレイン酸基、アミノ基、カルボン酸基および含ケイ素官能基のうちから選択される請求項1記載のインナーライナー用積層体。
- 前記樹脂材料が、エチレン−ビニルアルコール共重合体からなる請求項1記載のインナーライナー用積層体。
- 前記ジエン系エラストマーが天然ゴムを含有する請求項1記載のインナーライナー用積層体。
- 前記ゴム層のうち、タイヤ内面に配置された際にタイヤ内面側に位置する層が、架橋剤を含有する請求項1記載のインナーライナー用積層体。
- 前記ゴム層が、同種または異種のゴム組成物よりなる請求項1記載のインナーライナー用積層体。
- 前記ゴム層の、JIS Z0237に準拠するプローブタック試験により測定されるタックの値が、同一か、または、タイヤ内面に配置された際にタイヤ内面側に位置する層のほうが小さい請求項1記載のインナーライナー用積層体。
- 前記架橋剤が硫黄またはパーオキサイドである請求項1記載のインナーライナー用積層体。
- 前記架橋剤が硫黄である請求項9記載のインナーライナー用積層体。
- 前記ゴム層のそれぞれの厚みが、1〜1000μmの範囲である請求項1記載のインナーライナー用積層体。
- 前記ゴム層のそれぞれの厚みが、1〜500μmの範囲である請求項11記載のインナーライナー用積層体。
- 前記ゴム層のそれぞれの厚みが、5〜200μmの範囲である請求項12記載のインナーライナー用積層体。
- 請求項1記載のインナーライナー用積層体を用いたことを特徴とするタイヤ。
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WO2016040893A1 (en) * | 2014-09-12 | 2016-03-17 | Nike Innovate C.V. | Membranes and uses thereof |
CN105584072B (zh) * | 2015-12-21 | 2018-03-06 | 双钱集团(江苏)轮胎有限公司 | 一种新型的工程胎内衬层宽复合贴合方法 |
CN109153246B (zh) * | 2016-05-31 | 2021-04-20 | 株式会社可乐丽 | 层叠体、多层结构体和它们的制造方法 |
JP2017214002A (ja) * | 2016-05-31 | 2017-12-07 | 株式会社ブリヂストン | 空気入りタイヤのインナーライナー、空気入りタイヤ及び空気入りタイヤの製造方法 |
WO2018112125A1 (en) | 2016-12-15 | 2018-06-21 | Bridgestone Americas Tire Operations, Llc | Sealant-containing tire and related processes |
JP7128218B2 (ja) * | 2017-06-30 | 2022-08-30 | コーロン インダストリーズ インク | 軽量化されたゴム補強材の製造方法 |
JP6866538B1 (ja) * | 2019-09-24 | 2021-04-28 | 株式会社クラレ | 積層体 |
US20220396060A1 (en) * | 2019-09-24 | 2022-12-15 | Kuraray Co., Ltd. | Multilayer Structure, Molded Product, and Method for Producing Molded Product |
CN112895665B (zh) * | 2019-12-04 | 2022-09-06 | 北京橡胶工业研究设计院有限公司 | 高阻隔层叠体及其使用该层叠体的充气轮胎 |
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