Applications
1. Basic Overview
EAA (Ethylene Acrylic Acid Copolymer) is a high-performance thermoplastic copolymer produced by the high-pressure free-radical copolymerization of ethylene and acrylic acid monomers . It is characterized by the presence of carboxyl groups (-COOH) along the polymer chain, which significantly enhance its polarity and reactivity.
Key Molecular Characteristic:
The acrylic acid (AA) content typically ranges from 6% to 20% by weight .
Higher AA content increases polarity, transparency, toughness, and adhesion .
Higher melt index (MI) improves processability and flow .
2. Key Technical Properties & Advantages
EAA offers a unique combination of properties that distinguish it from other polyolefins like LDPE or EVA.
|
Property Category |
Technical Description |
Benefit |
|
Exceptional Adhesion |
Bonds directly to polar substrates without primers: aluminum, steel, copper, glass, paper, cellulose, nylon, and polyurethane . |
Enables multilayer structures without separate adhesives. |
|
Thermal Stability |
Higher thermal stability than EVA; non-corrosive to processing equipment . |
Suitable for higher temperature extrusion and retort applications. |
|
Mechanical Toughness |
High tensile strength, elongation (up to 750%), and puncture resistance . |
Provides durability in flexible packaging and coatings. |
|
Barrier Properties |
Good resistance to grease, oil, and solvents; low water vapor transmission . |
Protects contents in food and industrial packaging. |
|
Optical Clarity |
High transparency and gloss, especially at higher AA levels . |
Enhances product appeal in packaging. |
|
Environmental Stress Crack Resistance (ESCR) |
Excellent resistance to cracking under stress in harsh environments . |
Extends product lifespan in demanding applications. |
|
Carboxyl Functionality |
Reactivity with metal ions (forming ionomers) and amines; solubility in hot alkaline solutions . |
Enables water-based coatings and adhesives; allows crosslinking. |
3. Typical Property Ranges (General EAA Grades)
|
Property |
Typical Value Range |
Test Method |
|
Density |
0.930 – 0.940 g/cm³ |
ASTM D792 |
|
Melt Index (190°C/2.16kg) |
0.8 – 35 g/10 min (varies widely by grade) |
ASTM D1238 |
|
Acrylic Acid Content |
6.0 – 11.2 wt% (up to 18% in some grades) |
|
|
Melting Point (DSC) |
85°C – 101°C |
ISO 3146 |
|
Vicat Softening Point |
40°C – 90°C |
ASTM D1525 |
|
Tensile Strength (at break) |
5 – 26 MPa |
ASTM D638 |
|
Elongation (at break) |
410% – 750% |
ASTM D638 |
|
Hardness (Shore D) |
25 – 80 (varies with AA content) |
ASTM D2240 |
4. Processing Guidelines
EAA is thermoplastic and can be processed on conventional equipment designed for polyolefins.
Common Processing Methods:
Extrusion Coating: Widely used for coating paper, board, and aluminum foil (e.g., for aseptic packaging) .
Blown & Cast Film: For flexible packaging films and heat-seal layers .
Injection Molding: For parts requiring toughness and chemical resistance .
Extrusion Lamination: As a tie layer in multilayer structures .
Powder Coating: Applied via flame spray or fluidized bed for metal protection .
Hot Melt Adhesive Formulation: High-MI grades used as base polymers .
Typical Processing Conditions (Extrusion Coating):
Melt Temperature: <260°C (typically 235-260°C) to maintain stability .
Barrel Temperature Profile: Ramping from ~135°C (feed zone) to ~235°C (die) .
5. Detailed Applications by Industry
|
Industry Sector |
Primary Applications |
Key Properties Utilized |
|
Packaging (Flexible & Rigid) |
• Aseptic Packaging: Barrier layer in liquid packaging boards (e.g., juice, milk) . |
Adhesion to foil/paper, heat-seal strength, barrier to grease/moisture, retort resistance. |
|
Adhesives & Sealants |
• Hot Melt Adhesives: For bonding difficult substrates . |
Polar functionality, high wetting, bond strength to glass/metal, FDA compliance. |
|
Coatings |
• Metal Coatings: Corrosion-resistant coatings for pipes, steel, and automotive parts (flame spray) . |
Adhesion to metal/paper, corrosion resistance, flexibility, hardness. |
|
Wire & Cable |
• Cable Shielding Layers: Semiconductor shielding for power cables . |
Thermal stability, adhesion to copper/aluminum, electrical properties. |
|
Automotive & Transportation |
• Interior Parts: Impact modifiers in engineering plastics . |
Toughness, flexibility, adhesion to metals, chemical resistance. |
|
Industrial & Specialty |
• Powder Coatings: Functional coatings for appliances and industrial equipment . |
Compatibility, ESCR, adhesion. |
|
Emerging & High-Tech |
• 3D Printing: Specialty filament/additives for engineering-grade parts . |
Purity, biocompatibility, customizability. |
6. Market & Supply Chain Context (As of 2026)
Global Capacity: ~30,000 tons/year, with consumption ~250,000 tons/year .
Major Global Producers: SK Global Chemical, Dow, ExxonMobil, INEOS, Mitsui (CR5 ~90%).
Chinese Market: 100% import-dependent historically, but domestic production is starting. The first domestic EAA plant (40,000 tons/year, satellite chemical Co. and SKGC JV) is expected to start production in 2025 in Lianyungang, China .
Key Pricing: EAA is a high-value specialty chemical, typically priced at ~20,000-25,000 RMB/ton for coating grades .
7. Important Handling & Compatibility Notes
Incompatible Additives: Avoid blending or processing with amines, epoxides, or metal oxides/hydroxides (unless controlled crosslinking is intended), as they can trigger premature crosslinking or degradation .
Moisture Absorption: EAA is slightly hygroscopic due to the acrylic acid content. Drying may be recommended before processing to prevent surface defects (e.g., in film/coating) .
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