WO2015186703A1 - 空気入りタイヤ - Google Patents
空気入りタイヤ Download PDFInfo
- Publication number
- WO2015186703A1 WO2015186703A1 PCT/JP2015/065903 JP2015065903W WO2015186703A1 WO 2015186703 A1 WO2015186703 A1 WO 2015186703A1 JP 2015065903 W JP2015065903 W JP 2015065903W WO 2015186703 A1 WO2015186703 A1 WO 2015186703A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cord
- tire
- carcass ply
- pneumatic tire
- cords
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/0042—Reinforcements made of synthetic materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/02—Carcasses
- B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
- B60C9/08—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship the cords extend transversely from bead to bead, i.e. radial ply
-
- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
- D02G3/48—Tyre cords
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/02—Carcasses
- B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
- B60C2009/0416—Physical properties or dimensions of the carcass cords
- B60C2009/0425—Diameters of the cords; Linear density thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C9/00—Reinforcements or ply arrangement of pneumatic tyres
- B60C9/02—Carcasses
- B60C9/04—Carcasses the reinforcing cords of each carcass ply arranged in a substantially parallel relationship
- B60C2009/0416—Physical properties or dimensions of the carcass cords
- B60C2009/0466—Twist structures
Definitions
- the present invention relates to a pneumatic tire (hereinafter, also simply referred to as “tire”), and more particularly, to improve cut resistance, handling stability and lightness by using a cord including an aramid fiber as a reinforcing cord for a carcass ply.
- tire also simply referred to as “tire”
- cord including an aramid fiber as a reinforcing cord for a carcass ply.
- a pneumatic tire has a carcass made of a carcass ply extending in a toroidal shape between a pair of bead portions, and a belt layer or a belt reinforcing layer formed by rubberizing various reinforcing elements is arranged on the outer periphery thereof.
- the tread portion is reinforced.
- PET polyethylene terephthalate
- rayon rayon that is a cellulose fiber
- Patent Document 1 proposes a run-flat tire having a carcass ply in which aramid fiber cords arranged at an angle of 45 to 90 ° with respect to the tire circumferential direction are covered with a topping rubber.
- This run-flat tire improves the fatigue resistance of the aramid fiber cord and improves the run-flat durability by setting the upper twist coefficient T of the aramid fiber cord in the range of 0.50 to 0.70.
- Patent Document 1 discusses run-flat durability, but does not mention other performance such as cut resistance and steering stability. Therefore, it cannot be said that other tire performances using an aramid fiber cord as a reinforcing cord for a carcass ply have been sufficiently studied, and there is still room for study. In recent years, the importance of environmental performance has increased, and the need for weight reduction of tires has also increased. In order to reduce the weight of a tire, it is common to reduce the number of rubber and reinforcing members, but other performance degradation such as the durability of the tire must be avoided.
- an object of the present invention is to provide a pneumatic tire with improved cut resistance, steering stability and light weight, using a cord containing aramid fibers as a reinforcing cord for a carcass ply.
- the present inventors have solved the above problems by setting the physical properties of the cords including the aramid fibers that are the reinforcing cords of the carcass ply and the number of drivings to a predetermined relationship. As a result, the present invention has been completed.
- the pneumatic tire of the present invention is a pneumatic tire having a carcass made of at least one carcass ply as a skeleton.
- the ratio of the cross section of the reinforcing cord in the cross section in the cord vertical direction of the carcass ply is preferably 50 to 80%.
- the upper twist coefficient is preferably 0.5 to 0.8.
- the total fineness is preferably 1400 dtex or less.
- the number of driving is 70/5 cm or more.
- the reinforcing cord is made of yarn of 500 dtex or more and less than 700 dtex.
- FIG. 1 is a cross-sectional view of the right half of a preferred example of the pneumatic tire of the present invention.
- the illustrated tire 10 includes a tread portion 1 that forms a ground contact portion, a pair of side portions 2 that extend inward in the tire radial direction continuously to both side portions of the tread portion 1, and an inner peripheral side of each side portion 2.
- the tread portion 1, the side portion 2, and the bead portion 3 are reinforced by a carcass 4 including a single carcass ply extending from one bead portion 3 to the other bead portion 3 in a toroidal shape. Has been.
- a belt 5 composed of two belt layers 5a and 5b may be disposed outside the tread portion 1 of the carcass 4 in the tire radial direction.
- a belt reinforcement layer 6 may be disposed on the radially outer side.
- the reinforcing cord of the carcass ply is a cord including an aramid fiber
- the upper twist coefficient T is 0.5 to 0.8.
- the reinforcing cord of the carcass ply is a cord including an aramid fiber and may be a cord made of only an aramid fiber, or may be a so-called hybrid cord containing other organic fibers.
- the reinforcing cord of the carcass ply preferably contains 50% or more of aramid fibers.
- the cord having an aramid fiber may be a spun yarn.
- the angle of the carcass ply is preferably in the radial direction, and specifically, about ⁇ 15 ° in the radial direction.
- the total fineness of the reinforcing cord is set to 1800 dtex or less, and the number of reinforcing cords to be driven is set to 55/5 cm or more. That is, by using a thin reinforcing cord, the number of driven cords can be made dense. As a result, the interval between the reinforcing cords becomes narrower and cuts can be prevented. It will be excellent. Moreover, since case rigidity can be made larger, steering stability can be improved more.
- the lower limit value of the yarn is preferably 500 dtex or more, and more preferably 550 dtex or more.
- the upper limit is preferably 1800 dtex or less, more preferably 900 dtex or less, and further preferably less than 700 dtex.
- the total fineness is preferably 1400 dtex or less, and more preferably 70 or more.
- the total fineness of the reinforcing cord is preferably 800 dtex or more. If it is less than 800 dtex, the strength of the carcass ply is insufficient, and the durability of the tire may be reduced. Further, in the tire 10 of the present invention, the number of driving of the reinforcing cords of the carcass ply is preferably 100/5 cm or less. This is because when it exceeds 100 pieces / 5 cm, the productivity in the weaving process is lowered.
- the ratio of the cross section of the reinforcing cord in the cross section of the carcass ply in the cord vertical direction is preferably 50 to 80%.
- the ratio of the cross section of the reinforcement cord in the cross section in the cord vertical direction of the carcass ply By setting it as the said range, even if there is a local input in a side part, since the space
- the carcass 4 is composed of one carcass ply.
- two or more carcass plies may be provided.
- the belt 5 composed of two layers of the first belt layer 5a and the second belt layer 5b is disposed on the outer side of the crown region of the carcass 4 in the tire radial direction. It is not limited to this.
- the 1st belt layer 5a and the 2nd belt layer 5b can use what a plurality of steel cords arranged in parallel in the tire width direction without being twisted are embedded in rubber,
- the first belt layer 5a and the second belt layer 5b may be disposed so as to intersect each other between the layers to form a cross belt.
- a belt reinforcing layer 6 is disposed on the outer side in the tire radial direction of the belt 5. Since the reinforcement cord of the belt reinforcing layer 6 is intended to ensure tensile rigidity in the tire circumferential direction, it is preferable to use a cord made of highly elastic organic fibers.
- Organic fiber cords such as aramid, polyethylene naphthalate (PEN), polyethylene terephthalate, rayon, Zylon (registered trademark) (polyparaphenylene benzobisoxazole (PBO) fiber), aliphatic polyamide (nylon), etc. Can be used.
- reinforcing members such as inserts, flippers, side reinforcing layers may be arranged.
- the insert is a reinforcing material (not shown) in which a plurality of highly elastic organic fiber cords are arranged in the tire circumferential direction from the bead portion 3 to the side portion 2 and are coated with rubber.
- the flipper is disposed between a main body portion of the carcass ply that extends between the bead cores 7 and a folded portion that is folded back around the bead cores 7, and the bead cores 7 and the beads disposed on the outer side in the tire radial direction.
- the angle between the insert and the flipper is preferably 30 to 60 ° with respect to the circumferential direction.
- a bead core 7 is embedded in each of the pair of bead portions 3, and the carcass 4 is folded and locked around the bead core 7 from the inside of the tire to the outside.
- the carcass plies constituting the carcass 4 at least one carcass ply is folded back around the bead core 7 from the inner side to the outer side in the tire width direction, and the folded end is a crown portion of the belt 3 and the carcass 2. It is good also as what is called an envelope structure located between.
- a tread pattern may be appropriately formed on the surface of the tread portion 1, and an inner liner (not shown) may be formed on the innermost layer.
- the gas filled in the tire can be normal or air with a changed oxygen partial pressure, or an inert gas such as nitrogen.
- the tire of the present invention is suitable for a pneumatic tire for passenger cars.
- Examples 1 to 8 and Comparative Examples 1 to 4 In tire size 195 / 65R15, it has a pair of left and right bead portions and side portions, and a tread portion that is continuous between both side portions, and is pneumatic with a carcass that extends in a toroid shape across the bead portions. A tire was produced.
- the carcass is composed of one carcass ply, and two belt layers (material: steel cord (1) crossing each other at an angle of ⁇ 20 ° with respect to the tire circumferential direction on the outer side in the tire radial direction of the crown portion of the carcass. ⁇ 5)) was arranged.
- the total fineness of the carcass ply reinforcement cord, the number of driving, the upper twisting coefficient, the ratio of the cross section of the reinforcing cord to the cross section of the carcass ply in the cord vertical direction (indicated in the table as the occupied area) are shown in Tables 1 and 2.
- Tables 1 and 2 As shown in Using the obtained tire, the cut resistance, steering stability and lightness were evaluated. The evaluation procedure is as follows.
- ⁇ Cut resistance> A piece of 8cm metal square pillar is placed on the road surface, each test tire is mounted on the front wheel of the test vehicle, the internal pressure is adjusted to 220kPa, and the average load is 550kg, at an angle of about 30 degrees. A test was carried out on this square pillar. Starting from a speed of 30 km / h, the test speed was increased by 5 km / h, and the speed at which the side portion of the reinforcing cord was broken was defined as the tire cutting speed.
- the case equivalent to a conventional tire is indicated by ⁇
- the case excellent is indicated by ⁇
- the case excellent is indicated by ⁇
- the case inferior is indicated by ⁇ .
- ⁇ Steering stability> A vehicle with each test tire mounted on four wheels was subjected to a straight line, lane change, and cornering to comprehensively evaluate steering stability. As a result, the average value of two test drivers was obtained, and the case where it was equivalent to the conventional tire was evaluated as ⁇ , the case where it was excellent as ⁇ , the case where it was very excellent as ⁇ , and the case where it was inferior as ⁇ .
- ⁇ Tire weight> Measure the weight of each tire, ⁇ if it is equivalent to the conventional tire, ⁇ if it is lighter, ⁇ if it is very lighter, ⁇ if the tire weight has increased did.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Tires In General (AREA)
Abstract
Description
前記カーカスプライの補強コードが、アラミド繊維を含み、かつ、下記式、
T=N×√{(0.125×D/2)/ρ}×10-3
(式中、Nはコードの撚り数(回/10cm)、Dはコードのトータル繊度、ρはコードの密度を表す)で表される上撚り係数Tが0.5以上、トータル繊度が1800dtex以下であり、前記カーカスプライにおける前記補強コードの打ち込み数が55本/5cm以上であることを特徴とするものである。
図1は、本発明の空気入りタイヤの一好適例の右半分の断面図である。図示するタイヤ10は、接地部を形成するトレッド部1と、このトレッド部1の両側部に連続してタイヤ半径方向内方へ延びる一対のサイド部2と、各サイド部2の内周側に連続するビード部3と、を備え、トレッド部1、サイド部2およびビード部3は、一方のビード部3から他方のビード部3にわたってトロイド状に延びる一枚のカーカスプライからなるカーカス4により補強されている。図示するように、本発明のタイヤ10においては、カーカス4のトレッド部1のタイヤ半径方向外側には2層のベルト層5a、5bからなるベルト5が配置されていてもよく、ベルト5のタイヤ半径方向外側には、ベルト補強層6が配置されていてもよい。
T=N×√{(0.125×D/2)/ρ}×10-3
(式中、Nはコードの撚り数(回/10cm)、Dはコードのトータル繊度、ρはコードの密度を表す)で表される上撚り係数Tが0.5以上である。アラミド繊維を含む、上撚り係数Tが0.5以上のコードとすることで、耐疲労性の向上につながる。また、アラミド繊維を含むコードとすることで、ケース剛性が向上するため、操縦安定性を向上させることができる。好適には、上撚り係数Tは、0.5~0.8である。
(占有面積)=(補強コードの直径)/{(補強コードの直径)+(隣接する補強コードの間隔)}×100
<実施例1~8および比較例1~4>
タイヤサイズ195/65R15にて、左右一対のビード部およびサイド部と、両サイド部間に連なるトレッド部とを有し、ビード部間に跨ってトロイド状に延在するカーカスを骨格とする空気入りタイヤを作製した。カーカスは1枚のカーカスプライからなるものとし、カーカスのクラウン部のタイヤ半径方向外側には、タイヤ周方向に対し±20°の角度で互いに交錯する2層のベルト層(材質:スチールコード(1×5))を配置した。カーカスプライの補強コードのトータル繊度、打ち込み数、上撚り係数、カーカスプライの、コード垂直方向の断面に占める、補強コードの断面の割合(表中では、占有面積と表記)は、表1、2に示すとおりである。得られたタイヤを用いて、耐カット性、操縦安定性および軽量性について評価を行った。評価手順は、それぞれ以下のとおりである。
一片が8cmの金属製の四角柱を路面に配置し、各供試タイヤをテスト車両の前輪に装着して内圧を220kPaに調整し、平均荷重を550kgとした状態で、約30度の角度でこの四角柱に乗り上げる試験を行った。速度30km/hから開始して5km/hずつ試験速度を上げていき、サイド部の補強コード切れが発生した速度をそのタイヤのカット速度とした。従来のタイヤと同等の場合を△、優れている場合を○、非常に優れている場合を◎、劣っている場合を×とした。
各供試タイヤを4輪に装着した車両にて、直線、レーンチェンジおよびコーナリング走行を行って、操縦安定性を総合的に評価した。結果は、テストドライバー2名の平均値を求めて、従来のタイヤと同等の場合を△、優れている場合を○、非常に優れている場合を◎、劣っている場合を×とした。
<タイヤ重量>
各タイヤの重量を測定し、従来のタイヤと同等の場合を△、軽量化されている場合を○、非常に軽量化されている場合を◎、タイヤ重量が増加してしまった場合を×とした。
2 サイド部
3 ビード部
4 カーカス
5 ベルト
6 ベルト補強層
7 ビードコア
8 ビードフィラー
10 空気入りタイヤ(タイヤ)
Claims (7)
- 少なくとも1枚のカーカスプライからなるカーカスを骨格とする空気入りタイヤにおいて、
前記カーカスプライの補強コードが、アラミド繊維を含み、かつ、下記式、
T=N×√{(0.125×D/2)/ρ}×10-3
(式中、Nはコードの撚り数(回/10cm)、Dはコードのトータル繊度、ρはコードの密度を表す)で表される上撚り係数Tが0.5以上、トータル繊度が1800dtex以下であり、前記カーカスプライにおける前記補強コードの打ち込み数が55本/5cm以上であることを特徴とする空気入りタイヤ。 - 前記カーカスプライの、コード垂直方向の断面に占める、前記補強コードの断面の割合が、50~80%である請求項1記載の空気入りタイヤ。
- 前記上撚り係数が0.5~0.8である請求項1記載の空気入りタイヤ。
- 前記上撚り係数が0.5~0.8である請求項2記載の空気入りタイヤ。
- 前記トータル繊度が1400dtex以下である請求項1記載の空気入りタイヤ。
- 前記打ち込み数が70本/5cm以上である請求項1記載の空気入りタイヤ。
- 前記補強コードが500dtex以上700dtex未満のヤーンからなる請求項1記載の空気入りタイヤ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016525186A JP6588898B2 (ja) | 2014-06-06 | 2015-06-02 | 空気入りタイヤ |
US15/315,462 US20170087938A1 (en) | 2014-06-06 | 2015-06-02 | Pneumatic tire |
EP15803500.6A EP3153331B1 (en) | 2014-06-06 | 2015-06-02 | Pneumatic tire |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2014-118099 | 2014-06-06 | ||
JP2014118099 | 2014-06-06 |
Publications (1)
Publication Number | Publication Date |
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WO2015186703A1 true WO2015186703A1 (ja) | 2015-12-10 |
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ID=54766772
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2015/065903 WO2015186703A1 (ja) | 2014-06-06 | 2015-06-02 | 空気入りタイヤ |
Country Status (4)
Country | Link |
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US (1) | US20170087938A1 (ja) |
EP (1) | EP3153331B1 (ja) |
JP (1) | JP6588898B2 (ja) |
WO (1) | WO2015186703A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020080446A1 (ja) * | 2018-10-17 | 2020-04-23 | 株式会社ブリヂストン | タイヤ |
WO2020080445A1 (ja) * | 2018-10-17 | 2020-04-23 | 株式会社ブリヂストン | タイヤ |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7070194B2 (ja) * | 2018-07-23 | 2022-05-18 | 住友ゴム工業株式会社 | 空気入りタイヤ |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005001619A (ja) * | 2003-06-16 | 2005-01-06 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ及びその製造方法 |
JP2009035131A (ja) * | 2007-08-01 | 2009-02-19 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2009161033A (ja) * | 2008-01-04 | 2009-07-23 | Sumitomo Rubber Ind Ltd | サイド部補強層及びランフラットタイヤ及びサイド部補強層の製造方法 |
JP2013154766A (ja) * | 2012-01-30 | 2013-08-15 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ |
JP5494894B1 (ja) * | 2013-08-12 | 2014-05-21 | 横浜ゴム株式会社 | 乗用車用空気入りタイヤ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP3884156B2 (ja) * | 1997-02-25 | 2007-02-21 | 住友ゴム工業株式会社 | 空気入りタイヤ |
JP4242960B2 (ja) * | 1998-12-24 | 2009-03-25 | 株式会社ブリヂストン | 重荷重用空気入りラジアルタイヤ |
JP4769228B2 (ja) * | 2007-06-01 | 2011-09-07 | 住友ゴム工業株式会社 | ランフラットタイヤ |
JP4538032B2 (ja) * | 2007-09-05 | 2010-09-08 | 住友ゴム工業株式会社 | 不整地走行用の自動二輪車用タイヤ |
JP6338291B2 (ja) * | 2012-10-26 | 2018-06-06 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニーE.I.Du Pont De Nemours And Company | タイヤまたはベルトなどの物体の補強のための複合層 |
-
2015
- 2015-06-02 WO PCT/JP2015/065903 patent/WO2015186703A1/ja active Application Filing
- 2015-06-02 EP EP15803500.6A patent/EP3153331B1/en active Active
- 2015-06-02 JP JP2016525186A patent/JP6588898B2/ja active Active
- 2015-06-02 US US15/315,462 patent/US20170087938A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005001619A (ja) * | 2003-06-16 | 2005-01-06 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ及びその製造方法 |
JP2009035131A (ja) * | 2007-08-01 | 2009-02-19 | Sumitomo Rubber Ind Ltd | 空気入りタイヤ |
JP2009161033A (ja) * | 2008-01-04 | 2009-07-23 | Sumitomo Rubber Ind Ltd | サイド部補強層及びランフラットタイヤ及びサイド部補強層の製造方法 |
JP2013154766A (ja) * | 2012-01-30 | 2013-08-15 | Yokohama Rubber Co Ltd:The | 空気入りラジアルタイヤ |
JP5494894B1 (ja) * | 2013-08-12 | 2014-05-21 | 横浜ゴム株式会社 | 乗用車用空気入りタイヤ |
Non-Patent Citations (1)
Title |
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See also references of EP3153331A4 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020080446A1 (ja) * | 2018-10-17 | 2020-04-23 | 株式会社ブリヂストン | タイヤ |
WO2020080445A1 (ja) * | 2018-10-17 | 2020-04-23 | 株式会社ブリヂストン | タイヤ |
Also Published As
Publication number | Publication date |
---|---|
JP6588898B2 (ja) | 2019-10-09 |
EP3153331A1 (en) | 2017-04-12 |
US20170087938A1 (en) | 2017-03-30 |
EP3153331A4 (en) | 2017-07-12 |
JPWO2015186703A1 (ja) | 2017-04-20 |
EP3153331B1 (en) | 2019-08-28 |
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