1. Otsuka Chemical Co., Ltd. Otsuka Advanced Conductive Materials Introduction of DENTALL

2.  DENTALL is Otsuka ceramic material covered with nanometer thick conductive layers. Otsuka Chemical Co., Ltd. What is DENTALL?

3.  Stable conductivity under various environmental exposures  Homogeneous conductivity  Excellent dispersability  Colorability for the white and transparent types  Conductivity over a wide range, which is consistent, and easy to control Otsuka Chemical Co., Ltd. Features of DENTALL

4.  Engineering plastics reinforcement  Heat resistant material  Ion exchange material  Friction material  Precision filter  Functional material Otsuka Chemical Co., Ltd. Otsuka Ceramic Material's Application

5. Features of DENTALL WK-500 - Conductivity over a wide range, which is consistent, and easy to control - Surface resistance vs content in acrylic resin 10 20 30 40 50 60 70 80 Pigment content in solid (wt%) Surface resistance (  ) 10 10 9 10 8 10 7 10 6 10 5 10 4 10 3 10 2 DENTALL WK-500 Conductive Powder

6. * Coated on PET film - coating 20 micron thick, 30wt% DENTALL in acrylic binder. General properties of DENTALL WK-500 WK-500 Base materialsTiO 2 Resistance (Otsuka method)[  ] 10 0-1 Whiteness (Otsuka method) 79.0 Total luminous transmittance [%]* 25.0 max True specific gravity3.5-4.0 Bulk density [gr./cm 3 ] 0.2-0.4 pH (dispersed in H 2 O) 3.0-5.0 Dispersability in H 2 OExcellent Dispersability in TolueneOK

7. DENTALL WK500 - HS CODE & PACKING STYLE WK-500 HS Code2823.00 PackingFiber Drum Net20.0 kg Gross23.7 kg Dimension (mm) 455 × 455 × 560H

8. Consistency of surface resistance within a section of PU coatd film containing with WK-500 Regularity of surface resistance Surface resistance (  ) Measuring points ① ② ③ ④ ⑤ Measuring points ①② ③ ④⑤ 100mm 10 6 10 5 Otsuka Chemical Co., Ltd. - Homogeneous Conductivity - Features of DENTALL - Homogeneous Conductivity -

9. DENTALL WK-500 comparison between various ways of dispersion Condition *Rotation : 2500 rpm *Binder : Acrylic type binder with WK-500 *Solid content of WK-500 : 30% Dispersion type Ultrasonic dispersion for 5 min. High speed mixer for 15 min. Condition recommended Surface resistance /  6.0 × 10 5 5.0 × 10 5 not recommended 2.0 × 10 6 over 2.0 × 10 6 Comparision example Ball mill for 5 min. then high speed mixer for 15 min. Ball mill for 15 min. then high speed mixer for 15 min. Otsuka Chemical Co., Ltd. Features of DENTALL - Excellent dispersability -

10. Comparison data between DENTALL and other conductive materials for Whiteness and Total luminous transmittance Typical ValuesWhitenessTotal luminous transmittance* /% *Condition Base : Coated on PET Film (Thickness : 100 micron) Binder : Acrylic / 30wt% content with 20 micron thickness WK-500 TM-100 TM-200 BK-400W+TiO 2 (0.1:1) Conductive Silica Conductive Tin oxide 79 min. 69 72 65 55 25 max. 81 83 － 49 68 Otsuka Chemical Co., Ltd. Features of DENTALL - Colorability for the white and transparent types -

11.  Conductive paint  Conductive adhesive  Conductive composite  Conductive film  Functional paper Otsuka Chemical Co., Ltd. Applications of DENTALL

12. Automobile bumper Clean room Silicon wafer basket Otsuka Chemical Co., Ltd. Current Known Applications of DENTALL

13. Acrylic binder / 40 % solid WK-500 Total Surface resistance Solid content P/B Viscosity WK-500 content in solid Acrylic binder: Auto Aclose Super FS clear made by DNT, Japan Dispersion condition: 2500 rpm×5 min. Thickness : 50 micron Dispersed by T.K. Homo Disper 2.5 made by Tokushukika Co., Japan part  % cp % 90.9 9.1 100 2.0 × 10 9 45.5 0.25 1700 20 85.4 14.6 100 1.6 × 10 6 48.8 0.43 2000 30 78.9 21.1 100 1.3 × 10 5 52.7 0.67 2300 40 Conductivity over a wide range, which is consistent, and easy to control Otsuka Chemical Co., Ltd. DENTALL WK-500 Basic formulation

14. Grade Oil absorption rate (ml/100g) WK-500140 BK-400W100 TM-100 143 Conductive Cabon black 740 TiO 2 (JR-805) 33 Test method:JIS K-5101 Note) The figures for above are not standard, its just approximate reference. Otsuka Chemical Co., Ltd. Comparison Data regarding Oil Absorption Rate

15. 10 12 10 1110 10 9 10 8 10 7 10 6 10 5 10 4 10 3 10 2 10 10 -1 10 -2 10 -3 10 -4 Resistivity  ・ cm Insulative material (plastic) Semi insulative resin (polymer alloy) Semi conductive material (electrostatic recording paper) (sensitized paper) Antistatic material (flooring, wall, paint) Resistance material (heating element, semi conductive layer for cables) Conductive material (electro magnetic shield) High conductive material (wiring material, metal) Otsuka Chemical Co., Ltd. Classification of Resistivity

16. The Name of Interior Parts Otsuka Chemical Co., Ltd. The Name of Parts - Automobiles -

17. Otsuka Chemical Co., Ltd. The Name of Outer Parts The Name of Parts - Automobiles -

18. Otsuka Chemical Co., Ltd. The Name of Outer Parts The Name of Parts - Automobiles -

19. Acid resistance (Dipping in under 10% HCl) Whiteness (L value) Dipping time Intial 7 days 14 days 21days 28days value 85 80 75 Otsuka Chemical Co., Ltd. Chemical Resistance of WK-500 - Acid Resistance -

20. Alkaline resistance (Dipping in under 10% NaOH) Powder resistance (  ) Dipping time Intial 7 days 14 days 21days 28days value 10 1 10 0 Otsuka Chemical Co., Ltd. Chemical Resistance of WK-500 - Alkaline Resistance -

21. Measurement Point No.1 Measurement Point No.2 Measurement Point No.3 Measurement Point No.4 Measurement Point No.5 Note) Formulation : Acrylic binder / WK-500 = 70 : 30 (wight ratio) 4.96 × 10 6 1.18 × 10 7 1.26 × 10 7 1.33 × 10 7 1.40 × 10 7 1.06 × 10 6 1.84 × 10 6 2.13 × 10 6 2.80 × 10 6 3.40 × 10 6 (PET film and Non-coat paper) Paper PET filmSurface resistance Conclusion : In the case of paper, the paper absorbs the binder, and there is a lot of WK-500 on the surface. This facilitates the network contact between each WK-500 particle, and results in good surface conductivity. In the case of PET film, there is less WK-500 on the surface than in the case of paper due to WK-500 particles being homogeneously dispersed inside the coating layer. Therefore, apart from substrates, like paper and wood which can absorb the binder, there are no differences in the surface conductivity among the substrates. Otsuka Chemical Co., Ltd. Effects of substrates on surface conductivity

22. Surfaceresistance (  ) 10 7 10 6 10 5 10 4 dry / wet cycle Initial dry wet dry wet dry wet dry 5days 30days 60days value room condition DENTALL compound No.1 Current competitor’s material Note) dry/wet conditions dry conditon : 100 ℃ ×2.5hrs. Wet condition : 98RH%×12hrs. Formulation : 1) WK-500(40wt%)/PVA, Total solid content 10wt% 2) Zinc oxide(70wt%)/PVA, Total solid content 10wt% Otsuka Chemical Co., Ltd. Stability of Surface Resistance of Water-Borne Base Paint Formulated with WK-500 under Dry/Wet Cycle Conditions

23.  We evaluated the primer application by using the folowing 4 formulations and assessed the surface resistance and adhesiveness. 1. Water base primer 2. Solvent base primer 3. Solvent non-halogen base primer 4. Solvent base primer(Pellet type) Otsuka Chemical Co., Ltd. WK-500 Primer Application Evaluation

24. Formulation CPO / HARDLEN EH-202 (Water borne type) 83 WK-500 10 Dispersion agent (BYK-154) 2 Anti foaming agent (BYK-032) 5 100 (parts) After formulation Solid content 26.6% WK-500 content in Solid 37.6% Viscosity 50 cp Painting method 1. Disperse the above formulation at the condition of 2,500rpm × 10 min. 2. Wipe the unpainted PP surface with IPA 3. Paint the above on PP by bar coater No.10 4. Dry this at 85 ℃ × 10 min. Surface resistance (  / □ ) 2-5 × 10 6 Otsuka Chemical Co., Ltd. WK-500 Primer Application Evaluation - Water Base Primer -

25. Formulation CPO / HARDLEN 13MLJ (Solvent type) 75 WK-500 10 Dispersion agent (BYK-P104S) 1 Solvent (Xylene) 14 100 (parts) After formulation Solid content 27.1% WK-500 content in Solid 36.9% Viscosity 500 cp Painting method 1. Disperse the above formulation at the condition of 2,500rpm × 10 min. 2. Wipe the unpainted PP surface with IPA 3. Paint the above on PP by bar coater No.10 4. Dry this at 85 ℃ × 10 min. Surface resistance (  / □ ) 1-5 × 10 6 Otsuka Chemical Co., Ltd. WK-500 Primer Application Evaluation - Solvent Base Primer -

26. Formulation CPO / HARDLEN MP-200 (non-halogen type) 75 WK-500 10 Dispersion agent (BYK-P104S) 1 Solvent (Xylene) 5 100 (parts) After formulation Solid content 25.2% WK-500 content in Solid 39.7% Viscosity 700 cp Painting method 1. Disperse the above formulation at the condition of 2,500rpm × 10 min. 2. Wipe the unpainted PP surface with IPA 3. Paint the above on PP by bar coater No.10 4. Dry this at 85 ℃ × 10 min. Surface resistance (  / □ ) 1-5 × 10 6 Otsuka Chemical Co., Ltd. WK-500 Primer Application Evaluation - Solvent Non-Halogen Base Primer -

27. Formulation CPO / HARDLEN CY-9122P (Pellet type) 17.5 WK-500 11.0 Dispersion agent (BYK-P104S) 1.5 Solvent (Xylene) 70.0 100 (parts) After formulation Solid content 28.5% WK-500 content in Solid 38.6% Viscosity 150 cp Painting method 1. Disperse the above formulation at the condition of 2,500rpm × 10 min. 2. Wipe the unpainted PP surface with IPA 3. Paint the above on PP by bar coater No.10 4. Dry this at 85 ℃ × 10 min. Surface resistance (  / □ ) 2-5 × 10 5 Otsuka Chemical Co., Ltd. WK-500 Primer Application Evaluation - Solvent Base Primer (Pellet type) -

28. Water base Solvent base Solvent non-halogen base Solvent base (pellet type) 2-5 × 10 6 1-5 × 10 6 2-5 × 10 5 10 15-20 Formulation Surface resistance (  / □ ) Adhesiveness Test (JIS K-5400) Paint thickness (micron) Otsuka Chemical Co., Ltd. WK-500 Primer Application Evaluation - Evaluation Result -

29. Formulation guideline BinderAcrylic binder22 Hardener 10 Pigment DENTALL WK-500 12 TiO 2 3 SolventButyl acetate 36 Xylene14 Dispersion agentBYK P104S 3 100 (parts) After formulation Solid content 30.8% WK-500 content in Solid 39.0% Surface resistance 4 × 10 5  / □ Otsuka Chemical Co., Ltd. DENTALL WK-500 Primer Application - m-PPE Base Primer -

30. Sectional plan High resistive layer (10 13 -10 16  ) Conductive layer (PU, Acrylic + WK-500 : 10 5 -10 7  ) Paper, Cloth or PVC, PET Conductive layer Otsuka Chemical Co., Ltd. DENTALL WK-500 Electrostatic Plotting & Printing Application

31. Formulation guideline Epoxy resin (Epires ER-8 : Akzo) 20.00 Curing agent (Epilink DP-660 : Akzo) 25.00 Defoamer (BYK-031 : Byk) 0.50 Wetting agent (BYK-181 : Byk) 1.00 Thixotropic agent (Beneton EW- 3%in water : Kronos) 2.00 Pigment (DENTALL WK-500 : Otsuka Chemical) 15.00 Thinner (Water ) 36.50 Total 100.00 Solid content. 52.5% WK content.in solid. 28.6% Surface resistance. 6×10 7 Ω/ □ Otsuka Chemical Co., Ltd. DENTALL WK-500 Antistatic Flooring or Wall Material for use in a Semiconductor Factory, Clean room

32. Mixing method guideline 1. Curing agent (Epilink DP-660) 2. Water(0.5) 3. Defoamer (BYK-031) 4. Pigment (DENTALL WK-500) 5. Water(0.5) 1) Mix and disperse the following order (1+2)→mixing→(+3)→mixing→(+4+5)→mixing 2) Add the above to Epoxy resin (Epires ER-8) and Disperse Otsuka Chemical Co., Ltd. DENTALL WK-500 Antistatic Flooring or Wall Material for use in a Semiconductor Factory, Clean room

33. Otsuka Chemical Co., Ltd. Flooring or wall whose surface of concrete is covered by binder (epoxy + DENTALL +pigment) Guiding formulation : DENTALL WK-500/epoxy+DENTALL WK-500 = 30-40 wt% Coated film thickness : 200 micron Resistivity : 10 5 -10 7  Compared with the currently used materials of Zinc oxide, DENTALL has the following merits : Stable and homogeneous conductivity Wide selectivity of conductivity DENTALL WK-500 Antistatic Flooring or Wall Material for use in a Semiconductor Factory, Clean room