SK Primacor™ 3330 Copolymer

Primacor™ 3330 copolymer is an ethylene-acrylic acid (EAA) resin specifically designed for extrusion coating and extrusion lamination applications. It is commonly used as an adhesive or sealing layer in packaging films, plastic hoses, and paper/metalized film laminates.

Property	Typical Value	Notes
Density	0.932 g/cm³	ASTM D792 / ISO1183
Melt Index (190 °C / 2.16 kg)	5.8 g/10 min	ASTM D1238
Acrylic Acid Content (AA%)	6.5 wt%	Internal method
Melting Point (DSC)	100°C	DSC measurement
Vicat Softening Point	85°C	ASTM D1525
Tensile Strength (Break)	17.4 MPa	ASTM D638
Elongation at Break	520%	ASTM D638
Seal Initiation Temperature	92.8°C	25 g/m² coating, extrusion conditions
Minimum Coating Thickness	20 µm	Typical for lamination

Performance Features of SK Primacor™ 3330

Excellent Adhesion: Bonds strongly to paper, paperboard, metalized films, aluminum foil, and polyethylene substrates.
Superior Heat-Seal and Hot-Tack Performance: Enables reliable sealing at moderate temperatures with strong hot-tack properties.
High Toughness and Oil / Grease Resistance: This EAA resin offers durability for films and laminates exposed to oils or fats.
Low Sensitivity to Moisture: The resin maintains adhesion and structural integrity under humid conditions.
Optimized for Extrusion Coating / Lamination: EAA Primacor™ 3330 Performs efficiently as an adhesive or sealing layer in multilayer laminates.

Main Applications

Flexible Packaging Laminates: Acts as a bonding or sealing layer for paper/aluminum/plastic films.
Plastic Hoses or Tubing Laminates: Enhances layer adhesion and structural integrity.
Extrusion Coating / Lamination: Provides adhesive or sealing functionality for films or composite layers.
Food-Contact Packaging: Can be used where regulations are met (final laminate structure must be verified).

Processing and Handling Recommendations

Equipment: Use corrosion-resistant extrusion components (stainless steel or nickel/chrome-plated) due to EAA’s carboxylic acid groups.
Processing Temperature: Typical melt temperature ~288 °C (adjust based on equipment, die, and process).
Substrate Preparation: Surfaces must be clean, dry, and free of oils or mold-release agents.
Storage: Store in a cool, dry, ventilated area; avoid direct sunlight and moisture.
Food Packaging Compliance: Ensure the final laminate structure meets local regulations.
Process Optimization: Test seal temperature, pressure, dwell time, coating thickness, and line speed to achieve optimal adhesion and laminate performance.