1. Characterization of Exxon Mobil
Escorene and Achieve Polypropylene
Resins
Stephen Whitson
11/23/2011

2. Materials
Exxon Mobil Chemical Inc.
 Escorene # PP3546 Escorene
 Isotactic homopolymer
 Contains Peroxide
 Fine granules (homogenous)
 MFR - 1200 g/10 min
 Achieve # 6936G1
 Metallocene based homopolymer
 Peroxide Free
 Large distribution of granular sizes
 MFR - 1550 g/10 min
Achieve

3. Melt-Blowing
Schematic of MB process
Hopper and screw extruder Die To Collector
Die Assembly

4. Processing
 Industrial Melt Blowing Line
 Haake Twin Screw Extruder
 Zenith Metering Pump
 Ingersol-Rand Air Compressor SSR-2000
 Collector
 6 in. die – 120 holes – 0.01in. hole diameter

5. Processing Parameters
Parameters Escorene® PP3546 Achieve® 6936G1
Air Pressure: 10 psi 10 psi
DCD: 20 20
Colllector Speed: 137 rpm (4.9 m/min) 137 rpm (4.9 m/min)
Extruder Speed: 57 rpm 69 rpm
Extruder Pressure: 160-180 psi 370-380 psi
Pump Pressure: 11 psi 14 psi
Pump Speed: 8.5 rpm 8.5 rpm
Air Temp: 500 ᵒF 500 ᵒF
Web Weight 100 g/m² 100 g/m²

6. Characterization
 Fiber Diameter
 6 samples
TMI 49-70
 Web Thickness (ASTM D5729)
 TMI 49-70
 10 samples
 Air Permeability (ASTM D737)
 TexTest FX 3300
 7 Samples
 Tensile (ASTM D5035) TexTest FX 3300
 EJA Tensile Tester -10 lb load cell
 8 (1” gauge) Samples CD
 5 (1” gauge) Samples MD
 Elmendorf Tear (ASTM D5734) EJA Tensile Tester
 TexTest FX 3750
 5 (2.5” x 4”) Samples CD & MD
TexTest FX 3750

7. Web Properties
Fiber Diam. Thickness Air Perm
Polymer
(µm) (mm) (cfm)
Escorene® Mean 1.95 1.15 27.57
Std. Dev. 0.595 0.09 1.01
Achieve® Mean 2.28 1.31 24.59
Std. Dev. 0.67 0.07 0.89
Escorene® Achieve®

8. Load vs. Elongation
2000
1800
1600
1400
1200
1000 Escorene MD
Load (gms)
Achieve MD
Escorene CD
800
Achieve CD
600
400
200
0
-0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
Elongation (in)

9. Mechanical Properties
Peak Load Peak Elongation Modulus Elmendorf
Polymer (gms) (% in) (gms/in²) (cN)
Mean 1403.0 5.40 1,283,755 51.7
Escorene®
Machine Std. Dev. 164.3 0.90 288,090 15.8
Direction
Mean 1894.6 5.07 1,758,291 49.4
Achieve®
Std. Dev. 228.7 0.42 158,099 11.9
Mean 605.6 18.45 244,525 79.6
Escorene®
Transverse Std. Dev. 39.4 2.55 14,633 18.8
Direction
Mean 619.7 8.39 347,856 68.6
Achieve®
Std. Dev. 17.3 0.8 18,948 6.6

10. Conclusion
 The Achieve Resin (MB Web)
 Higher Melt Flow Rate
 Lower Molecular Weight
 Peroxide Free/Cleaner
 Better Tensile Properties
Achieve Web
 The Escorene Resin (MB Web)
 Higher Molecular Weight
 Better Ductility and Tear Strength
Escorene Web