EVAtech EVA 140T/2 Copolímero de acetato de vinilo de etileno

For athletic footwear midsole production, EVAtech EVA 140T/2 is formulated as a closed-cell cellular matrix with a vinyl acetate content of 14 wt% and a melt flow index of 2.0 dg/min measured under ISO 1133-1:2022. The base resin is combined with 0.8 phr to 1.0 phr dicumyl peroxide, 3.2 phr to 4.2 phr azodicarbonamide, 1.2 phr zinc oxide, and 0.6 phr stearic acid in a 75 L tangential Banbury mixer with a drop temperature of 112°C to 118°C. After pelletizing, the compound is injection-molded into preforms at 95°C to 105°C barrel temperature and then expanded in a compression mold at 168°C to 174°C. The expansion-stage processing window is held within ±4°C because the half-life of dicumyl peroxide at 170°C is approximately 1 min, while the gas yield of azodicarbonamide reaches 220 cm³/g at 210°C. A lower temperature of 164°C produces incomplete blowing and a higher temperature of 178°C accelerates crosslinking before cell inflation, yielding a collapsed cell structure with density above 0.25 g/cm³. Finished midsoles produced under these conditions exhibit a density of 0.14 g/cm³ to 0.18 g/cm³, a Shore A hardness of 50 to 65 per ASTM D2240, and rebound resilience of 45% to 55% per ISO 4662. Compliance for footwear exported to the EU requires verification of PAH content under REACH Annex XVII Entry 50 and organotin compounds below 0.1 wt% under REACH Annex XVII Entry 20. Final components include midsoles, sock liners, and foam sheets for die-cut insoles.

Which Hot Melt Adhesive Formulations Retain Fiber Tear at −10°C With 14 wt% VA?

Adhesive compounding with EVAtech EVA 140T/2 is performed on a co-rotating twin-screw extruder with an L/D ratio of 48:1 and a low-shear screw profile to limit polymer chain scission at 160°C to 180°C. The molten adhesive is pelletized under water-ring cutting and later applied at 170°C to 190°C from a slot die coating line. A typical packaging-grade formulation contains 35 wt% EVA 140T/2, 38 wt% hydrogenated glycerol ester tackifier with a softening point of 95°C, 22 wt% Fischer–Tropsch wax with a congealing point of 96°C, and 0.8 wt% hindered phenolic antioxidant plus phosphite stabilizer. Open time on corrugated board at 25°C ranges from 2 s to 5 s, while setting speed is 0.8 s to 1.5 s on kraft liner. Low-temperature fiber tear below −10°C remains acceptable when wax content does not exceed 25 wt% and tackifier content is not reduced below 32 wt%. A melt viscosity of 800 mPa·s to 1,200 mPa·s at 180°C measured by ASTM D3236-15 allows application by gear pump without nozzle clogging. For indirect food contact packaging, the formulated adhesive must comply with FDA 21 CFR 175.105 and 21 CFR 176.170. For EU food-contact paper and board, migration of monomers and additives is assessed under Regulation (EU) No 10/2011 and organoleptic transfer is tested per EN 1230-1. Terminal products include case and carton sealing hot melts, bookbinding adhesives, and assembly adhesives for nonwoven hygiene article construction.

In low-voltage cable jacketing, halogen-free flame-retardant insulation compounds are produced by compounding EVAtech EVA 140T/2 with linear low-density polyethylene and an aluminium trihydroxide-magnesium dihydroxide filler system in a 65:1 L/D co-rotating twin-screw extruder. The formulation ratio of EVA 140T/2 to LLDPE is maintained between 70:30 and 60:40 by weight, and total metal hydroxide loading is held at 150 phr to 180 phr. A silane coupling agent of 1.0 phr to 1.5 phr is pre-absorbed on the filler, and an antioxidant masterbatch based on a hindered phenol-thioester system is added at 0.4 phr. Pre-drying at 80°C for 4 h is required when storage relative humidity exceeds 60%. The compound is pelletized at a melt temperature below 190°C to avoid premature release of water from ATH, which begins at 180°C to 200°C. Extrusion of a 1.5 mm jacket onto twisted copper conductors uses a single-screw extruder with a 90 mm screw diameter and L/D ratio of 30:1, a screen pack of 80/120/80 mesh, and a compression screw with a Maddock mixing section. The melt temperature at the die is controlled to 150°C to 165°C. The resulting jacket passes the vertical flame spread test of IEC 60332-1-2 when the limiting oxygen index of the compound exceeds 28% measured by ISO 4589-2. Tensile strength before ageing is not less than 10 MPa and elongation at break not less than 150% after ageing at 100°C for 168 h under IEC 60811-501. The final application covers single-core and multi-core control cables, appliance wiring, and low-smoke zero-halogen building wire marketed under CPR Euroclass D or C where smoke density per IEC 61034-2 permits.

When EVA 140T/2 Replaces Low-Density Polyethylene in Polypropylene Impact Modification

Compounding EVAtech EVA 140T/2 into polypropylene impact modification requires a specific screw geometry to manage the viscosity difference between the 14 wt% vinyl acetate copolymer and a 3 dg/min polypropylene homopolymer. A co-rotating twin-screw extruder with an L/D ratio of 40:1 and two kneading blocks is operated at 200°C to 230°C. The addition level of EVA 140T/2 is constrained to 10 wt% to 25 wt%; addition above 30 wt% causes a phase inversion that reduces flexural modulus below 600 MPa measured by ISO 178:2019. At 15 wt% loading, the notched Izod impact strength at 23°C increases to 8 kJ/m² to 12 kJ/m² from a baseline of 3 kJ/m² to 5 kJ/m² for the unmodified homopolymer under ISO 180:2020. At −20°C, the improvement is less pronounced, and published data for this specific configuration is limited. The process requires a downstream injection-molding stage with a clamp force of 2,000 kN to 5,000 kN and an injection speed of 60 mm/s to 100 mm/s to avoid surface delamination. Mold shrinkage is approximately 1.2% to 1.6%, compared with 1.0% to 1.3% for the base polypropylene, and is measured by ISO 294-4. The modified material is used in automotive interior trim, battery cases, and appliance housings where low-temperature ductility is required but full elastomer modification is not cost-justified. Compliance for automotive interior parts includes odour testing under VDA 270 and VOC emissions under VDA 278; appliance housings require glow-wire ignition temperature above 650°C under IEC 60695-2-11.

Carbon Black Masterbatch Carrier Behaviour in Low-MFR Polyolefin Systems

Carbon black masterbatch production using EVAtech EVA 140T/2 as the carrier resin is carried out in a kneader-type mixer or a twin-screw extruder with a dispersive screw design because the melt flow index of 2.0 dg/min provides higher shear stress than carriers based on wax or low-molecular-weight polyethylene. A typical formulation consists of 45 wt% to 50 wt% furnace black with a primary particle size of 25 nm to 35 nm, 5 wt% to 8 wt% PE wax, and the balance EVA 140T/2. The mixing temperature is maintained at 150°C to 170°C to prevent thermal decomposition of the vinyl acetate groups, which can release acetic acid above 200°C. The masterbatch is strand-pelletized through a die plate with 3 mm holes and a die-face cutter speed of 900 rpm to 1,200 rpm. Dispersion is evaluated by a filter pressure value below 2 bar/g on a 14 µm screen pack using ISO 13357-1. Terminal products include black masterbatch for agricultural film, stretch film, and injection-molded crates where the final carbon black loading is 1.5 wt% to 2.5 wt%. The carrier complies with EU Directive 94/62/EC for packaging and packaging waste when heavy metal sum concentration is below 100 mg/kg per EN 13428 and EN 13430.

At 8 wt% loading in straight-run bitumen, EVAtech EVA 140T/2 shifts the softening point from 85°C to 105°C under ASTM D36/D36M, and low-temperature flexibility passes a −10°C bend test without cracking under ASTM D5147. The copolymer content in the membrane compound is held between 5 wt% and 12 wt% based on the total bitumen phase. Mixing is conducted in a vertical cylindrical tank with a bottom-entering disperser and an oil-jacketed wall temperature of 190°C at a rotor speed of 1,200 rpm to 1,500 rpm. After mixing, the modified bitumen is compounded with 35 wt% filler, 5 wt% elastomeric SBS, and 0.3 wt% process stabilizer in a paddle mixer before calendering onto a polyester carrier at 160°C to 170°C. The finished membrane has a thickness of 3 mm to 5 mm and a tensile strength of 600 N/50 mm to 900 N/50 mm in the longitudinal direction under ASTM D5147. Compliance for EU waterproofing membranes is assessed under EN 13707 for flexible sheets for waterproofing and EN 13969 for bitumen damp-proof courses. The terminal products include torch-applied membranes, self-adhesive membranes for foundations, and bridge deck waterproofing layers.