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This information contained herein is given in good faith but without any guarantee or warranty and involve proprietary rights of third parties. Our advice given in this information does not release you from the obligation to check its validity and to test our products as to their suitability for the intended process and uses. The application, use and processing of our products manufactured by you on the basis of our technical advice are beyond our control and, therefore, entirely on your own responsibility. Our products are sold only in accordance with Product Specification separately issued by us.

JSR CorporationPetrochemical Products Div.

Thermoplastic Elastomer Dept.

JSR AT series for Tire applications

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JSR AT (Syndiotactic 1,2-Polybutadiene)�JSR AT is Syndiotactic 1,2 Polybutadiene (JSR AT) for Tire applications. �Melting point exists due to crystalline nature of Syndiotactic structure . �JSR AT is the rubber with high hardness & low viscosity.

Grade AT300 AT400

Form Pellet Pellet

Packing 25kgs Bag 25kgs Bag

Structure

1,2-Butadiene microstructure (%) 93 94

Crystallinity (%) 29 36

Non-Cure Properties

Density (mg/m3) 0.909 0.914

Melting point (℃) 105 126

MFR （150℃、21.2N） (g/10min) 3.0 9.0

Cure Properties*

ML1+4 (120ﾟC) 15.3 -

ML1+4 (130ﾟC) - 24.2

Hardness (Duro A) 91 94

M100 (MPa) 6.7 9.9

M300 (MPa) 13.5 17.1

Strength at break (MPa) 15.3 21.2

Elongation at break (%) 320 330

*:Recipe；Polymer/ZnO/Stearic acid/Acc.DM**/Acc.TET**/S=100/3/2/1.5/0.66/1.6phr *Acc.DM ; Dibenzothiazyldisulfide*Acc.TET ; Tetra ethylthiuramdisulfide

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Component Tread Base tread（Belt） Bead Carcass Side wall

Base polymer S-SBR/BR NR/E-SBR NR/Phenol NR BR/NR

Processability Low Viscosity ◎ ◎ ◎ ◎ ◎

Decrease of consumption energy ◎ ◎ - ◎ ◎

High green strength ◎ ◎ ◎ ◎ ◎

Small mill shrinkage of sheet - ◎ - ◎ ◎

Driving stability High-Hardness ◎ ◎ ◎ ◎ ◎

High-elastic shear modulus (G’) ◎ ◎ - ◎ ◎

Rolling Resistance Low 50℃ tanδ(by using Soft Carbon Black) - ◎ - ◎ -

Better Rolling Resistance(by decreasing content of Carbon Black) - ◎ - ◎ -

Physicalproperties Better Modulus(M300) ◎ ◎ ◎ - ◎

Better Tensile strength - - ◎ - -

Better Tear strength - ◎ ◎ - ◎

Durability Better crack growth - ◎ - ◎ ◎

Better Heat Resistance - ◎ ◎ ◎ -

� JSR AT is suitable for various tire applications.

JSR AT series for Tire applications

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Recipe ;

Stearic acid/ZnO/6C*1/CZ*2/S = 2.0/5.0/1.0/1.0/4.0

Mixer ; 250cc Laboratory-plastomill

Tim (min) Ingredients Circulating Oil Temp. Rotor Speed Stage 1 0.0

0.5

2.53.5

Polymer (NR)AT300orAT400,CB

ZnO, Stearic Acid, 6C, OilClean up

Damp at about 130oC

100oC 60rpm

Stage 2 0.0

1.5

Batch from Stage 1 Accelerator, Sulfur

Damp at about 100oC

70oC 60rpm

Mixing Procedure ;*1；N-(1,3-Dimethyl-butyl)-N’-phenyl-p-phenylendiamine*2；N-Cyclohexyl-2-benzothiazyl-sulfenamide(CBS)

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Run No. Ref-1 1 2NR（RSS#3） 100 80 80AT300 - 20 -AT400 - - 20N330（HAF） 50 50 50OIL（T-DAE） 10 10 10

Effect of JSR AT for NR compound

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Physical properties of unvulcanized rubberI. Viscosity & Properties of flowII. Extrusion testIII.Green strength & Shrinkage ratio

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I. Viscosity & Properties of flow

Comp'd ML1+4 (125℃) Flow rate

� Addition of AT decreases compound viscosity and increases flow rate.

Exce

llent

Excellent

【Flow rate test conditions】1)Set temp;130℃2)Die size;2mm×2mmφ3)Load;60kgf

Run No. Ref-1NR only

1AT300

2AT400

Die swell 182% 155% 149%

Edge Poor Good Excellent

Surface Poor Good Excellent

Sample

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II. Extrusion test

� Addition of AT improves extrudability.� Especially, compound with At400 shows excellent extrudability.

〔Extruder Conditions〕1)Cylinder & Die temp ; 100℃2)Die type ; Garvey die3)Screw rotation ; 20rpm

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III. Green strength & Shrinkage ratio

� Addition of AT increases green strength and decreases mill shrinkage.

Green strength Shrinkage ratio

【Shrinkage test conditions】1)Roll temp;60℃2)times;1minute3)Measurement time;2 hours after

Exce

llent

Excellent

⇒ JSR AT can improve the processability.

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Physical properties of vulcanized rubberi. Hardness & Elastic modulusii. Vulcanized adhesion to steel cordiii. Vulcanized adhesion to Tread and Carcassiv. Durability(Heat resistance)

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Hardness [Duro-A] Elastic modulus at 3% G’

i. Hardness & Elastic modulus

Exce

llent

Exce

llent

*Test mode ; Strain DependenceTemp=50℃Frequency=100rad/sec

� Addition of AT provides high Hardness and high Elastic modulus.

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ii. Vulcanized adhesion to steel cord【Test Method】・Steel cord : Brass plated cord Size : φ0.25mm×4・Cure Condition : 160℃×10min・Test speed : 50mm/min ← 650mm →

↑Φ4mm

↓

CompoundSteel cord

Tension

Run No. Ref-1NR only

1AT300

2AT400

Original 140 180 180Heat cycle test 50times 160 170 190Heat cycle test 100times 130 160 160

Strength to pull out [Unit : N]

Run No. Ref-1NR only

1AT300

2AT400

Original 100 125 120Heat cycle test 50times 105 115 120Heat cycle test 100times 80 105 120

Amount of remaining rubber [INDEX]

【Heat cycle test】1cycle : 0℃→Temperature rise at 5℃/min→30min Hold at 100℃→ Temperature drop at 5℃/min→30min Hold at 0℃

� Addition of AT can improve the vulcanized adhesion to steel cord.

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iii. Vulcanized adhesion to Tread and Carcass【Test Method】・Cure Condition : 160℃×10min・Test speed : 50mm/min

Run No. Ref-1NR only

1AT300

2AT400

Tread 120 140 130Carcass 240 230 270

Peel Strength [Unit : N/15ｍｍ]

Tread；HP355R/BR01/1165MP/Si75/N339/OIL/Stearic acid/ZnO/6C/DPG/CZ/S=80/20/65/5.2/5/10/2/3/1/1.5/1.8/1.5Carcass ; NR(RSS#3)/N330/OIL/Stearic acid/ZnO/6C/CZ/S=100/50/10/1/5/1/1/4

� Vulcanized adhesion of compound with AT is as same as NR compound.Tension

Tens

ion

15mm 4mm

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iv. Durability(Heat resistance)

Tensile strength Hardness[Duro-A]*Test condition ; Temp=100℃ aging

Exce

llent

Excellent

� Addition of AT provides good durability.

⇒ JSR AT can improve the physicalproperties of NR compound.

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Summary

★Adding AT to NR compound can improve following properties.� Decreases compound viscosity and increases flow rate.� Excellent extrudability. � Increases green strength and decreases mill shrinkage.

� High hardness and High Elastic modulus.� High vulcanized adhesion to steel cord.� Good durability.

☆NR compound with AT can improve followingTire properties.

Processability（low compound viscosity）Driving stability（High hardness and modulus）High adhesive property of steel cordDurability（Good Heat resistance）