Amco PRIMATOP LLDPE 009919B is a butene-copolymer linear low-density polyethylene supplied as a film-extrusion resin. Film-grade butene copolymers in this product class are commonly specified at density 0.918–0.922 g/cm³ per ISO 1183-1:2019 and melt flow rate 0.8–1.2 g/10 min at 190 °C/2.16 kg per ISO 1133-1:2022. The downstream scenarios address collation shrink, cast stretch, agricultural covering, surface protection, heavy-duty FFS sacks, and food-contact sealant webs. Where a value is not published for this exact grade, the range represents industrial practice for butene-copolymer LLDPE film conversion and should be confirmed against line-specific rheological calibration.

Blown-film converters producing collation shrink sleeves at output rates above 450 kg/h use Amco PRIMATOP LLDPE 009919B as the primary butene copolymer component in 45–70 µm monolayer or 25/25/25 µm three-layer structures. Free shrink in machine and transverse directions is evaluated according to ASTM D2732-14; tensile properties are generated under ASTM D882-18 and ISO 527-3:2018 at 500 mm/min; shrink tension is tracked using ISO 14616:1997. Industrial formulations comprise 70–85 wt% butene LLDPE, 10–20 wt% autoclave LDPE for bubble stability, and 0–20 wt% mLLDPE for dart-impact retention; a 5% slip/antiblock masterbatch is let down at 1–3 wt%, yielding 500–1500 ppm erucamide and 1000–3000 ppm synthetic silica. The blown-film process runs on monolayer or three-layer lines with screw L/D 24:1–30:1, melt temperature 195–220 °C, die gap 1.0–2.0 mm, blow-up ratio 2.2:1–3.2:1, and frost-line height 300–600 mm. Bubble flutter and TD shrink loss appear when blow-up ratio exceeds 3.2:1 or frost-line height exceeds 700 mm, because butene LLDPE has lower melt strength than hexene LLDPE. Screen-pack melt pressure typically stabilizes at 280–380 bar; pressure excursions beyond 420 bar indicate gel accumulation and require screen-pack replacement. Downstream finishing includes perforation, corona treatment, and transverse sealing. Terminal products include collation shrink sleeves for 6-pack and 12-pack beverage cans, printed shrink overwrap for PET bottles, and secondary bundling film for household goods.

What limits cling-layer retention in cast stretch film below 15 µm at winder speeds above 450 m/min?

At cast-film line speeds above 450 m/min, cling retention below 15 µm is governed by the slip/antiblock balance matched to chill-roll cylinder temperature. Cling force is quantified using ASTM D5458-95(2020), puncture resistance using ASTM D5748-19, and tensile elongation under ISO 527-3:2018. Typical formulation is 85–95 wt% butene LLDPE, 5–15 wt% LDPE or mLLDPE for draw stability, 0.5–2 wt% polyisobutylene tackifier, and a 0.5–1.5 wt% masterbatch carrying silica antiblock at 1000–2000 ppm in the final film. The cast-film process uses a slot die gap 0.4–0.8 mm, air gap 10–30 mm, chill roll temperature 18–25 °C, line speed 250–600 m/min, and corona treatment to 36–42 mN/m before pre-stretch and slitting. Draw resonance and neck-in increase at melt temperature above 260 °C or air gap beyond 40 mm; production lines observe cling-force decay below 50 g/25 mm after surface transfer or cold storage below 5 °C. Winder tension taper is set at 20–40 N/m roll width to avoid telescoping and cling transfer. Finished products include hand stretch film 15–17 µm, machine wrap 20–23 µm, and pre-stretched rolls for pallet unitization.

For multi-season greenhouse cover and low-tunnel film production, the low-temperature impact retention of butene LLDPE in LLDPE/LDPE/EVA multilayer structures is the primary technical determinant. Durability and labeling are assessed under EN 13206:2017; tensile and tear measurements follow ISO 527-3:2018 and ASTM D1922-15; accelerated weathering is performed under ISO 4892-3:2016. Formulations in commercial practice use 60–85 wt% butene LLDPE, 5–20 wt% LDPE, and 5–15 wt% EVA, with additive masterbatches added separately: HALS light stabilizer 0.2–0.6 wt%, anti-drip additive 0.5–1.2 wt%, and IR-absorbing mineral filler 1–2 wt%. Anti-drip loading above 1.2 wt% is avoided because die-lip plate-out becomes visible after 48–72 h of continuous extrusion and degrades roll quality. The film is produced on three-layer blown-film lines with blow-up ratio 2.0:1–3.0:1, die gap 1.2–2.0 mm, melt temperature 190–215 °C, and automatic gauge control maintaining ±5 µm variation. For films certified for 2-year service under EN 13206, weathering evaluation is often extended to 3000 h xenon-arc exposure, with residual tensile above 50%. Finished configurations include 150–200 µm greenhouse covers, 25–50 µm low tunnels, and 15–25 µm black or white mulch films.

Surface protection web flatness and peel adhesion in coil coating lines

Because coil coating and profile lamination operations demand a cast protective web with controlled migration of processing additives into acrylic or polyurethane adhesives, the formulation must balance low modulus against peel-strength retention. Peel adhesion of the pressure-sensitive film is measured per ASTM D3330/D3330M-04(2018), tensile properties per ISO 527-3:2018, and haze per ISO 14782:1999. Formulation is 75–90 wt% butene LLDPE, 10–25 wt% mLLDPE or LDPE to lower modulus, antiblock at 1000–3000 ppm, and slip at 300–600 ppm; the base web is corona-treated to 38–42 mN/m immediately before adhesive coating. The film is extruded through a cast slot die with die gap 0.5–0.8 mm and drawn on a chill roll at 30–50 °C to 40–70 µm thickness. Line speeds are typically 150–350 m/min because higher throughput can increase thickness variation beyond ±2 µm and create hard bands in winding. Corona dosage is maintained at 8–12 W·min/m²; dosage above 15 W·min/m² causes surface oxidation and non-uniform adhesive wetting. Above 60 °C storage, low-molecular-weight species migrate to the adhesive interface and reduce peel strength below 0.5 N/25 mm on stainless steel; treatment below 36 mN/m causes adhesive transfer and edge lifting. Finished products include PE protection film for aluminum composite panels, stainless steel sheet, glass substrates, and powder-coated profiles.

When heavy-duty FFS sacks require dart impact above 800 g after 36 months of ambient warehouse storage

On form-fill-seal (FFS) lines for bulk polymer granules and mineral fertilizers, butene LLDPE is combined with LDPE or HDPE to balance dart impact and filling-line stiffness. Compliance measurements include ASTM D1709-16a for dart drop, ASTM D1922-15 for Elmendorf tear, ISO 527-3:2018 for tensile strength, and ISO 7765-1 for free-falling dart impact on film. Typical formulation is 60–80 wt% butene LLDPE, 10–25 wt% LDPE, and 0–15 wt% HDPE to increase secant modulus; where outdoor or high-UV storage is specified, a 3–5 wt% carbon black masterbatch is added. Processing uses three-layer coextrusion blown-film lines with die diameter 150–250 mm, die gap 1.5–2.5 mm, blow-up ratio 1.8:1–2.5:1, melt temperature 200–225 °C, and film thickness 80–180 µm. Melt pump pressure variation is controlled within ±5 bar to prevent gauge bands on the film. Hot filling above 60 °C for certain mineral products reduces elongation at break, so seal bar settings and fill rate are adjusted to prevent elongation below 500% at filling. At blow-up ratio above 2.5:1 or frost-line height outside the calibrated range, MD tear strength can fall below 120 N/mm after high-humidity storage. Finished products include 25 kg FFS sacks for polymer resin, 25–50 kg bags for fertilizer, and valve sacks for construction materials.

Where flexible food-contact structures use a sub-40 µm sealant web laminated to BOPP or PET, simultaneous demands on heat-seal plateau, additive migration, and corona-treatment stability determine the usable window. Compliance is assessed under FDA 21 CFR 177.1520, EU Regulation (EU) 10/2011 with overall migration below 10 mg/dm², and EC No 2023/2006 GMP; heat-seal strength is measured per ASTM F88/F88M-21. Formulation is 70–100 wt% butene LLDPE, 0–20 wt% LDPE, and 0–30 wt% mLLDPE for hot-tack performance; erucamide slip is used at 500–1500 ppm, and silica antiblock at 1000–3000 ppm. The sealant web is produced on blown-film lines at 25–50 µm or cast-film lines at 20–35 µm with die gap 0.8–1.4 mm, melt temperature 200–235 °C, and corona treatment to 38–42 mN/m before lamination. Seal initiation for butene LLDPE is normally observed in the 105–115 °C range at seal pressure 0.3–0.6 N/mm² and dwell 0.5 s; seal strength reaches a plateau around 125–135 °C. Hot tack is measured according to ASTM F1921-18 at 0.5 s dwell and 0.3 N/mm² seal pressure; values above 3 N/25 mm are required for vertical form-fill-seal at line speeds above 40 m/min. Additive packages containing non-olefin migrating species above 2 wt% are avoided because they reduce bond strength after 14-day aging at 40 °C. Finished products include flow wrap for confectionery, lidding film for dairy cups, sachets, and stand-up pouch sealant plies.

For frozen-food vertical packaging operations where seal-through-contamination and low-temperature flex cracking govern yields, butene LLDPE is specified in 50–100 µm three-layer structures. Food-contact compliance follows FDA 21 CFR 177.1520 and EU Regulation (EU) 10/2011; low-temperature ductility is quantified using ASTM D1709-16a dart drop at -20 °C, ASTM D1922-15 tear, and ASTM F88/F88M-21 seal strength after contamination with fine ice crystals. Formulation is 80–100 wt% butene LLDPE, 0–20 wt% mLLDPE or LDPE for optical and seal enhancement, erucamide slip 500–1500 ppm, and silica antiblock 1000–2500 ppm. The film is extruded on three-layer blown lines at 50–100 µm with die gap 1.0–1.8 mm, blow-up ratio 2.0:1–2.8:1, melt temperature 200–225 °C, and dual-lip air-ring cooling to maintain haze below 12% per ISO 14782:1999. Flex-crack resistance is assessed using ASTM F392/F392M-11(2018) Gelbo flex at -20 °C; pinhole counts above 5 per 300 cm² after 500 cycles indicate insufficient impact modification. Low-temperature brittleness becomes the primary failure mode when the film is flexed at -30 °C; converters avoid reducing thickness below 50 µm for free-flowing frozen vegetables because zipper opening forces during consumer use can exceed 20 N. Seal-through-contamination requires seal bar pressure 0.4–0.6 N/mm² and dwell 0.5 s. Finished products include printed pillow bags for frozen vegetables, zipper freezer bags, and ice cream overwrap.