SK EAA Primacor™ 3440 copolymer, an ethylene acrylic acid resin, is specifically developed for use in extrusion coating and extrusion lamination applications.

Property Typical Value Test Conditions / Notes
Density 0.938g/cm³ ASTM D792
Melt Index 10 g/10 min 190°C/2.16 kg
Acrylic Acid Content 9.7 wt% –
Melting Point 98°C DSC
Vicat Softening Point 81°C ASTM D1525
Tensile Strength (Yield) 7.9 MPa ASTM D638
Tensile Strength (Break) 17.6 MPa ASTM D638
Elongation at Break 600 % ASTM D638
Recommended Melt Temp. 260–290°C For extrusion coating
Heat-Seal Initiation Temp. 85°C Typical
Minimum Coating Thickness 10 µm (0.4 mil) Typical process value

Performance Features of Primacor™ 3440

1. Outstanding Adhesion:
Provides strong bonding to paper, paperboard, aluminum foil, metallized film, and polyethylene substrates, making it ideal for multilayer laminations and coated packaging structures.

2. Excellent Heat-Seal and Hot-Tack Properties:
Ensures reliable sealing at relatively low initiation temperatures and strong hot-tack performance, suitable for extrusion-coated films.

3. Toughness and Crack Resistance (ESCR):
Offers excellent flexibility and environmental stress crack resistance in film applications.

4. Moisture Resistance
Maintains adhesion and film integrity under humid conditions.

5. High Processing Speed Capability
Engineered for high-speed extrusion coating and lamination lines.

Main Applications

  • EAA Primacor™ 3440 copolymer is widely used in flexible and paper-based packaging as an extrusion coating or lamination resin.
  • It bonds paper, paperboard, aluminum foil, metallized film, and polyethylene layers into durable multilayer structures.
  • In liquid packaging board (such as milk or juice cartons), it serves as an adhesive or sealing layer between paperboard and polyethylene.
  • It is also used as a heat-seal or hot-melt adhesive layer in pouches, labels, and foil-laminated films.
  • Additionally, it functions as a tie layer or adhesive resin in multilayer laminations, ensuring strong adhesion between polar and non-polar substrates.
  • Thanks to its moisture stability, Primacor™ 3440 EAA resin can also be applied in structures that require reliable performance in humid environments.

Advantages and Limitations

(1) Advantages

  • Excellent adhesion to polar materials such as metalized film, foil, paperboard, and polyethylene.
  • Good heat-sealability, toughness, and process stability at high speeds.
  • Low sensitivity to moisture, ensuring reliable performance in humid conditions.
  • Can be used in food-contact and liquid packaging applications.

(2) Limitations/Considerations

  • Higher cost compared to standard non-polar PE or EVA resin.
  • Adhesion to low-polarity plastics (e.g., untreated PP or waxed PE) may be limited; surface treatment may be needed.
  • Prolonged use may cause mild corrosion on unprotected metal equipment due to acid functionality.
  • In multilayer laminations, improper process design can cause delamination or film cracking; optimization is necessary.

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