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EMA

Ethylene methyl acrylate copolymer; ethylene-methyl acrylate copolymer;EMA。 Ethylene copolymer with methyl acrylate content of 8%~40%. Milky white translucent solid. The melt flow rate is 2 ～ 6g/10min, and the Vicat softening point is 59 ℃. Good resistance to environmental stress cracking, excellent electrical performance, extrusion bonding temperature of 316~322 ℃. It is prepared by polymerization of ethylene and methyl acrylate under high pressure with oxygen or peroxide as initiator. It can be blown into film for disposable gloves, medicine and food packaging; Extruded hoses and profiles; Blow molded toys; Foaming foam board, etc

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1. EMA classification

EMA

2. Common applications of EMA

According to the regulations of FDA and USDA, EMAC meets the requirements of food packaging. EMAC has also been recognized as heat sealing and food surface contact material in terms of aseptic packaging using hydrogen peroxide cleaning solution. This kind of material also meets the requirements of Class VI standard of USP for medical use. EMAC resin will not release unpleasant substances, such as halogen, during incineration. The surface turbidity of EMAC film is higher than that of typical homopolymer LDPE. This characteristic and its latex rubber like softness make it very suitable for disposable gloves and some medical supplies. EMAC is a good extrusion adhesive and extrusion laminated resin. This is because it has natural good thermal stability, adhesion to common substrates, hot fusion and radio frequency fusion properties, and can be processed on the device designed for LDPE. EMAC resin is commonly co extruded with annular and planar film dies to form a hot-melt bonding layer on the substrate; Or it can be used as a bonding layer to improve the laminating adhesion of polyolefin, ionomer, polyester, polycarbonate, EVA, PVDC, EAA, OPET, OPP, etc. Hoses and profiles have excellent stress fracture resistance and low temperature impact strength. Foam sheets can be used for meat or food packaging. EMACN is used as a blending component with LDPE, polypropylene, polyester, nylon and polycarbonate to improve impact strength and toughness, enhance hot melt bonding performance, improve adhesion, reduce stiffness and increase surface friction coefficient.

3. Development history of EMA

EMAC is produced in an ordinary high-pressure reactor. Methyl acrylate monomer and ethylene gas are injected into the reactor together to generate random copolymer. The commercial EMAC contains 18~24% (wt) of methyl acrylate, and the melting index of commercial materials is 0.5~20 g/10 min. Some specifications are pure resin, while others contain smooth and anti bonding ingredients. In order to improve its processing performance and softness. Adhesive properties, other formulations are being developed. The most noteworthy performance improvements of EMAC copolymer (compared with LDPE homopolymer) include: Vicat softening temperature decreases from 194 ° F to 138 ° F; The bending modulus decreases; The resistance to environmental stress fracture is significantly improved; Improved dielectric properties. These materials have good resistance to most chemicals, but are not designed for continuous immersion in organic solvents and nitric acid.