POLY(ETHYLENE-CO-ACRYLIC ACID) (CAS 9010-77-9): Properties, Applications, and Procurement

POLY(ETHYLENE-CO-ACRYLIC ACID)
  
  When a packaging engineer at a medical device company in Suzhou noticed that the heat-seal layer of their sterilization pouches was delaminating under high-humidity storage, the root cause turned out to be a subtle batch variation in the copolymer used for adhesive lamination. The material in question was poly(ethylene-co-acrylic acid), a copolymer that combines the flexibility and thermal processability of polyethylene with the polar bonding capability that acrylic acid units introduce into the backbone. The engineer’s supplier had switched acrylic acid content slightly between lots, and the shift in melt flow index — barely visible on the CoA — had changed how the film responded to the sealing bar’s dwell time. That experience reshaped how the engineer specified incoming material: acrylic acid content, melt flow index at 190°C under 2.16 kg load, and molecular weight distribution became non-negotiable items on every purchase order.
  ♦Poly(ethylene-co-acrylic acid), known commercially under trade designations such as EAA, is produced by the high-pressure free-radical copolymerization of ethylene with acrylic acid, typically yielding acrylic acid contents that range from around 6 percent to 20 percent by weight depending on the end-use target. The carboxylic acid groups distributed along the polymer chain give it a polar character absent from pure polyethylene, enabling adhesion to metals, aluminum foil, polyester, and polar substrates that standard polyolefins cannot bond reliably. This polarity also means the resin can be partially neutralized with metal ions — sodium, zinc, magnesium — to form ionomers with dramatically enhanced mechanical toughness, as the ionic crosslinks that form on neutralization restrict chain mobility in ways that a covalent network cannot replicate. At Shandong Lookchemical, the available grades span a range of melt index and acrylic acid content, and technical documents specifying both are included in every shipment.
  Thermally, the polymer’s melting point sits below that of standard polyethylene because the acrylic acid units disrupt the regular crystalline packing of ethylene segments. This depression of crystallinity is not a defect — it is exploited deliberately in hot-melt adhesive formulations, where the lower processing temperature reduces energy consumption and thermal degradation of heat-sensitive substrates. A furniture manufacturer in Guangdong that bonds PVC edge banding to MDF panels switched from a higher-melting EVA-based adhesive to an EAA grade after complaints that the EVA was scorching light-colored veneers at application temperature. The EAA grade’s processing window at 130–145°C compared to EVA’s required 160°C resolved the scorching problem entirely while maintaining peel strength. The same property — combined with good low-temperature flexibility — makes EAA useful in cold-chain food packaging where the seal layer must remain intact at refrigeration and frozen-storage temperatures without cracking when flexed.
  In coatings and surface treatment, EAA dispersions or solutions apply a thin adhesion-promoting layer to paperboard, aluminum foil, and film structures that must later be laminated or printed. A printing house in Shanghai handling pharmaceutical blister packaging found that an EAA primer layer on the aluminum foil side improved ink adhesion scores by a significant margin compared to an unprimed surface, and reduced the rework rate on incoming quality inspections enough to justify the added step. For industrial anticorrosion applications on steel, thin EAA coatings applied by extrusion lamination provide a moisture barrier and a surface that resists handling scratches better than many single-component coatings, and the carboxylic acid groups interact favorably with phosphated steel surfaces through coordination chemistry at the metal oxide interface.
POLY(ETHYLENE-CO-ACRYLIC ACID)
  Shandong Lookchemical Co., Ltd. supplies poly(ethylene-co-acrylic acid) (CAS 9010-77-9) to customers in packaging film, hot-melt adhesive, coatings, and ionomer applications. Quality documentation including batch CoA, SDS, and export compliance paperwork accompanies every order. Sample quantities for qualification trials are available. For specification inquiries or volume pricing, reach the technical team at sales01@sdlookchemical.com or visit sdlookchem.com.

Related News Recommendations

Our Factory Equipment