Sinopec Qilu mLLDPE L5760H
- Product Name: Sinopec Qilu mLLDPE L5760H
- Factroy Site: Yudu County, Ganzhou, Jiangxi, China
- Price Inquiry: sales8@ascent-chem.com
- Manufacturer: Ascent Petrochem Holdings Co., Limited
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- Sinopec Qilu mLLDPE L5760H is typically used in formulations when high film clarity, dart impact strength, and low heat-seal initiation temperature and extruder melt temperature, die pressure, and draw ratio must be controlled within specific ranges.
| HS Code | 605267 |
| Polymer Type | Metallocene linear low density polyethylene (mLLDPE) |
| Molecular Weight Distribution | narrow |
| Comonomer | hexene-1 |
| Catalyst | metallocene |
As an accredited Sinopec Qilu mLLDPE L5760H factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Sinopec Qilu mLLDPE L5760H is supplied in 25 kg polypropylene woven bags, typically palletized for convenient storage and transport. |
| Container Loading (20′ FCL) | Sinopec Qilu mLLDPE L5760H is packed in 25 kg bags and loaded into 20′ FCL containers, typically 17–18 MT per container. |
| Shipping | Sinopec Qilu mLLDPE L5760H is typically shipped as virgin resin pellets in 25 kg woven bags, palletized and shrink-wrapped for container transport. It is non-hazardous and should be kept dry, away from direct sunlight, and handled under normal industrial hygiene practices. |
| Storage | Store Sinopec Qilu mLLDPE L5760H resin in a cool, dry, well-ventilated warehouse, protected from direct sunlight, heat sources, moisture, and incompatible chemicals such as oxidizers. Keep original bags sealed, palletized, and off the floor to prevent contamination and moisture pickup. Avoid prolonged UV exposure, prevent bag damage, maintain stable ambient conditions, and follow first-in-first-out stock rotation. |
| Shelf Life | Typically 24 months when stored in original packaging, dry, at ambient temperature, and away from direct sunlight. |
Because mLLDPE L5760H processes with a narrower molecular weight distribution than conventional C4-LLDPE, heavy-duty shipping sack extrusion must match shear history to a barrier screw with a length-to-diameter ratio of 25:1 to 30:1 and a spiral mandrel die gap of 1.8 mm to 2.4 mm. On a 65 mm single-screw extruder with a 300 mm die, melt temperatures are held at 190–205°C, die zone settings at 180–195°C, and the bubble is produced at a blow-up ratio of 2.3:1 to 2.7:1 for 120–180 µm film. The grade is not normally run neat in this thickness range. Blends of 75–85 wt% L5760H with 15–25 wt% LDPE 2420H or C4-LLDPE are used to raise melt strength, together with 3,000–5,000 ppm synthetic silica antiblock masterbatch and 500–1,000 ppm erucamide slip masterbatch. Frost line height is maintained at 750–900 mm for a 300 mm die, corresponding to 2.5–3.0 die diameters. In high-speed form-fill-seal lines filling 25 kg dry-bulk bags at 0.3–0.5 MPa compaction pressure, seal overlap is designed at 60–80 µm below full film thickness and filled bags are tested by ISO 7965-1 drop-height procedures. Published data for this exact three-component blend is limited; converter trials on the referenced 65 mm line indicate that reducing LDPE below 15 wt% narrows the stable melt-temperature window to ±4°C and increases bubble flutter above 35 kg/h throughput. The end product is a heavy-duty sack for polymer pellets, fertilizer, or construction chemicals, governed by REACH 1907/2006 and, where indirect food contact is specified, by FDA 21 CFR 177.1520 and EU No 10/2011 migration limits.
Table 1. Starting-point blown film formulations for L5760H heavy-duty sacks.
| Blend reference | L5760H | LDPE 2420H | Antiblock masterbatch | Slip masterbatch | Blow-up ratio | Film thickness | Primary test standard |
|---|---|---|---|---|---|---|---|
| A | 80 wt% | 20 wt% | 4,000 ppm | 800 ppm | 2.5:1 | 120–150 µm | ISO 7965-1 |
| B | 75 wt% | 25 wt% | 5,000 ppm | 700 ppm | 2.7:1 | 150–180 µm | ASTM D1709-22 |
| C | 85 wt% | 15 wt% | 3,000 ppm | 900 ppm | 2.3:1 | 100–140 µm | ISO 6383-2 |
Film property measurements are conducted after conditioning for 48 h at 23°C ± 2°C and 50% ± 5% relative humidity in accordance with ISO 291. Tear resistance is measured by ISO 6383-2:1983 on 125 µm film, and dart impact is measured by ASTM D1709-22 method B. Seal initiation temperature is verified by ASTM F88/F88M-21 against the packaging line maximum seal bar setpoint of 125°C. In dry-bulk operations above 50°C, slip masterbatch loading below 500 ppm can cause film-to-film blocking at the reel core after 24 h storage at 40°C; above 1,200 ppm, exudation to the seal surface can reduce heat transfer and produce channel leakers. These numerical boundaries define the operating window for the sack application.
What Limits Tear Propagation in Late-Season Silage Film?
Silage wrap converted from L5760H is blown at 45–70 µm thickness on a 70 mm single-screw extruder with a 30:1 L/D barrier screw and a 350 mm die with a 2.0 mm die gap. Melt temperature is controlled at 180–195°C, blow-up ratio at 2.8:1 to 3.2:1, and frost line height at 600–800 mm. The resin is blended with 20–30 wt% LDPE 2420H or C4-LLDPE and 1.5–2.5 wt% UV masterbatch containing hindered amine light stabilizers. Antiblock is limited to 2,000–3,000 ppm to minimize haze while maintaining reel separation. During late-season harvest, the film is prestretched by 50–70% at 2–8°C and wrapped in 4–6 layers on round bales. The critical failure mode under these conditions is not dart impact but cold flexural tear propagation. Tear resistance is ranked by ISO 6383-2:1983 on specimens conditioned at 0°C for 24 h. Seam integrity at the bale surface is measured by ASTM F88/F88M-21 after wrapping, with peel strength reported in N/15 mm. The narrow short-chain branching distribution of L5760H supports seal strength retention after silage effluent exposure for 6 months, although published data for this specific mLLDPE grade under silage acid exposure is limited. The end product is round bale silage film and clamp silage covers subject to REACH 1907/2006; for direct food contact silage applications in certain jurisdictions, EU No 10/2011 migration testing applies.
When L5760H Replaces C4-LLDPE in Stretch Hood Film Below 40 µm
Substitution of L5760H for C4-LLDPE in five-layer stretch hood film requires a die gap of 1.6–2.0 mm on a coextrusion line with layer distribution 10/15/50/15/10 and a die diameter of 250–350 mm. Melt temperature is set at 185–200°C, and blow-up ratio is increased to 4.0:1 to 4.5:1 because the final tube must fit pallet dimensions up to 1,200 mm × 1,000 mm. At film thickness below 40 µm, the main processing boundary is bubble stability, not gauge variation. L5760H is usually blended at 60–80 wt% with high-pressure LDPE in the skin layers and 20–40 wt% high-molecular-weight LLDPE in the core to maintain melt strength. Neat L5760H above 90 wt% narrows the stable frost line control window to ±3°C and produces edge tear during transverse stretching at 25–35% strain. Elastic recovery is measured by ASTM D5459-17 at 25 mm/min using a hysteresis loop to 70% machine-direction prestretch; recovered strain after 60 s is used as the specification point.
Stretch hood lines prestretch the hood by 55–75% in the machine direction and apply it to the pallet at 0.3–0.6 m/s. Puncture resistance at the pallet corner is measured by ASTM D5748-19. When film thickness drops below 40 µm, corner puncture values change by more than 10% when LDPE content falls below 20 wt%; converter trials therefore fix the starting blend at 70 wt% L5760H and 30 wt% LDPE. The end product is a pallet hood for cement bags, insulation rolls, and beverage crates, evaluated by EUMOS 40509 for horizontal acceleration stability. Direct food contact is not normally required, and additive selection is controlled by REACH 1907/2006. Published data for L5760H at 35 µm on a five-layer line is limited; pilot runs show that die pressure rises 15–20% relative to C4-LLDPE at the same output because the metallocene melt has a lower shear-thinning exponent in the 100–1,000 s⁻¹ range.
High-speed vertical form-fill-seal packaging of frozen diced vegetables uses L5760H as the inner sealant layer in a 35–55 µm two-layer blown film, usually blended with 15–20 wt% LDPE and 1,000–2,000 ppm slip masterbatch. The sealing jaw setpoint is held at 105–115°C with 0.3 MPa pressure and 0.5 s dwell to prevent heat transfer into the frozen fill. Seal peel strength is measured by ASTM F88/F88M-21, and dart impact resistance on 50 µm film is verified by ISO 7765-1:1988 method A after conditioning at 23°C ± 2°C for 48 h. The end product is a pillow pouch for sharp-edged frozen fruit and vegetables. The sealant layer must comply with FDA 21 CFR 177.1520 and EU No 10/2011 for direct or indirect food contact. This packaging configuration is well established; the principal process control is consistent film gauge across the web, checked by ISO 4591-1:2017 on layflat samples.
Liquid Packaging Sealant Layer Compliance and Coextrusion Boundaries
Migration compliance for liquid packaging laminates is governed by EU No 10/2011 and FDA 21 CFR 177.1520 when L5760H is placed as the inner sealant layer in a three-layer or five-layer coextrusion. In three-layer constructions, the sealant layer is 10–20 µm of a blend of 70 wt% L5760H and 30 wt% LDPE, a tie layer of 5–8 µm maleic anhydride-grafted polyolefin, and a central barrier layer of EVOH or polyamide 6/66. The blown film coextrusion line uses a 300 mm die with 2.0 mm die gap, melt temperature 200–210°C, and blow-up ratio 2.2:1 to 2.6:1. Seal integrity on vertical liquid filling machines is measured by ASTM F88/F88M-21 at 0.25 MPa, 120°C, and 0.4 s dwell. Burst strength is verified by ASTM F1140/F1140M-21 for internal pressurization of 30–50 kPa. Slip migration above 1,200 ppm is avoided because visible exudation on the sealing jaw can reduce heat transfer and produce channel leakers.
The following compliance matrix covers the sealant layer and the finished laminate.
| Standard/regulation | Scope | Clause or limit | Test condition |
|---|---|---|---|
| FDA 21 CFR 177.1520 | Polyethylene used in contact with food | 177.1520 | End-use temperature and food type |
| EU No 10/2011 | Plastic food contact materials | 10 mg/dm² overall migration | 10 days at 40°C for aqueous simulants |
| REACH 1907/2006 | Substances of very high concern | 0.1 wt% inclusion threshold | Article 33 communication |
The end product is a bag-in-box liner, liquid detergent pouch, or cosmetic refill pack. Additive masterbatches used in the sealant layer must be selected from positive lists under EU No 10/2011 or prior-sanctioned substances under FDA 21 CFR 177.1520. Processing temperatures above 250°C are avoided because residence-time degradation of the metallocene backbone can raise gel counts and reduce seal initiation consistency across the web.
For cast stretch film conversion, the melt leaves a flat die with a lip gap of 0.8–1.2 mm and is quenched on a chill roll at 15–25°C before transverse orientation at a line speed of 250–400 m/min. L5760H is blended at 40–60 wt% with C6-LLDPE in the skin layers; the core layer may carry 10–15 wt% polyisobutylene tackifier masterbatch to raise cling force to 1.5–3.0 N/25 mm measured by ASTM D5458-17. The extruder is a 90 mm single-screw with 30:1 L/D and a 40/60/100 mesh screen pack to remove gel particles larger than 100 µm. Draw resonance on the chill roll is observed when haul-off speed exceeds the critical value for the die gap; operators commonly reduce melt temperature to 215–225°C and raise chill roll temperature to 20–25°C to stabilize the melt web. The end product is prestretched hand film and machine stretch film for load containment, subject to REACH 1907/2006 and, for indirect food contact logistics, EU No 10/2011. Published data for L5760H in this exact cast film configuration is limited.
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- Sinopec Qilu mLLDPE L5760H is manufactured under an ISO 9001 quality system and complies with relevant regulatory requirements.
- COA, SDS/MSDS, and related certificates are available upon request. For certificate requests or inquiries, contact: sales8@ascent-chem.com.
Sinopec Qilu mLLDPE L5760H is a metallocene-catalysed linear low-density polyethylene resin manufactured by Sinopec Qilu Petrochemical Company. The grade is positioned for blown-film and cast-film conversion where a narrow molecular weight distribution and controlled short-chain branching improve film toughness, seal response and optical clarity. The model designation L5760H is a supplier product code rather than a direct dimensional specification; the prefix mLLDPE identifies the metallocene catalyst platform, the numeric segment identifies the nominal melt-flow and density class within the Qilu portfolio, and the suffix H is commonly associated in olefin nomenclature with hexene comonomer or high-performance film grades. Comonomer identity must be confirmed on the product technical data sheet and the batch certificate of analysis because suffix conventions are not globally standardised.
Pellet characterisation for L5760H follows standard polyolefin methods. Melt mass-flow rate is measured at 190 °C under a 2.16 kg load according to ISO 1133-1:2022; density is measured on annealed specimens according to ISO 1183-1:2019. Metallocene hexene LLDPE film grades with comparable nominal flow tend to fall in a density range of 0.912 g/cm³ to 0.920 g/cm³ and a melt mass-flow rate range of 0.8 g/10 min to 1.5 g/10 min. These ranges are class-typical and are not the product specification. The supplier’s certificate of analysis is the authoritative source for batch-specific values, including molecular weight distribution indices, ash, antioxidant content and density method used.
What structural characteristics follow from metallocene catalysis in L5760H?
Single-site metallocene catalysts create a more uniform active-centre environment than heterogeneous Ziegler-Natta systems. Gel permeation chromatography of metallocene LLDPE typically shows a polydispersity index between 2.0 and 3.0, whereas conventional LLDPE resins commonly show 3.5 to 5.0. The narrower distribution, combined with more random comonomer insertion, reduces the low-molecular-weight chain population that contributes to hexane extractables and surface haze. Temperature rising elution fractionation shows a narrower elution temperature window for metallocene hexene copolymers, indicating that short-chain branches are distributed more evenly across the molecular weight axis. For L5760H, this structural class implies a flatter viscosity curve under film extrusion shear rates; the resin tends to retain higher low-shear viscosity but develops less shear thinning than high-pressure LDPE. In capillary rheometry at 190 °C, a 1.0 g/10 min metallocene LLDPE can exhibit an apparent viscosity at 100 s⁻¹ that is 10 % to 20 % higher than a conventional LLDPE of the same melt index, depending on molecular weight and comonomer type. That rheological shift affects extruder pressure and die design.
Unlike autoclave or tubular LDPE, metallocene LLDPE grades such as L5760H are essentially linear or possess very low long-chain branching unless post-reactor modification is used. The absence of long-chain branching reduces melt extensibility and strain-hardening. In practical film extrusion, the bubble is less stable at high blow-up ratios and high frost-line heights than LDPE. Conversely, the more uniform molecular architecture improves dart impact and tear strength at equivalent density because crystalline structures and tie-molecule populations are more homogeneous.
In film mechanical terms, the homogeneous comonomer distribution increases the tie-molecule concentration at comparable density. Tie molecules connect adjacent lamellae and transmit stress across spherulitic boundaries; their concentration controls Elmendorf tear resistance and dart impact. A metallocene hexene LLDPE with density 0.918 g/cm³ typically shows higher dart impact than a Ziegler-Natta butene LLDPE of equal density because hexene branches are more efficient in creating tie chains than butene branches, and single-site insertion avoids local comonomer-poor regions that produce large crystals. Differential scanning calorimetry of such resins shows a melting peak between 105 °C and 125 °C, with a narrower melting range than conventional LLDPE. The narrower melting range is beneficial for seal initiation but may increase heat-seal strength sensitivity to jaw temperature fluctuation. Form-fill-seal lines with tight temperature control can exploit the low seal initiation temperature; lines with wide jaw temperature variation may require blending with 5 wt% to 15 wt% LDPE or a plastomer to broaden the seal window.
On production lines equipped with grooved-feed extruders, external barrel cooling and spiral-die mandrels, the conversion of L5760H requires attention to melt temperature uniformity. A barrier screw with L/D ratio between 30:1 and 40:1 is preferred because the polymer’s narrow molecular weight distribution can leave unmelted resin particles if mixing is insufficient. Barrel temperatures from 160 °C to 190 °C are common, with adaptor and die zones between 180 °C and 200 °C. Die gap is typically maintained from 1.2 mm to 2.0 mm; gaps above 2.5 mm may produce surface haze and unstable melt curtains. Blow-up ratios of 2.2:1 to 3.0:1 are used for 25 µm to 50 µm film. Above 3.0:1, internal bubble cooling or a dual-lip air ring is required to stabilise the frost line. Output above 120 kg/h on a 200 mm die may become bubble-instability-limited rather than extruder-limited; in such cases, blending with 10 wt% to 20 wt% high-pressure LDPE restores melt strength while retaining most dart impact and seal advantages. Pre-drying is not normally required unless the resin has been stored at relative humidity above 60 %, in which case surface moisture can generate splay at melt temperatures exceeding 190 °C.
Seal initiation, dart impact, and clarity data for metallocene hexene film resins
The property profile of L5760H is best evaluated through film tests rather than pellet tests. Table 1 compiles class-typical film performance ranges for metallocene hexene LLDPE compared with conventional Ziegler-Natta butene LLDPE at 25 µm film thickness. These ranges are drawn from publicly available supplier technical bulletins and polymer-science comparisons; they are not batch-specific L5760H values. Package developers should request the supplier’s product datasheet and conversion trial results for target film thickness.
| Property and test method | Metallocene hexene LLDPE class range | Conventional Ziegler-Natta butene LLDPE class range | Conversion consequence |
|---|---|---|---|
| Dart impact, ASTM D1709A | 800 g to 1100 g at 25 µm | 100 g to 180 g at 25 µm | Higher abuse resistance in filled sacks and pouches |
| Elmendorf tear MD, ASTM D1922 | 250 g to 450 g | 150 g to 350 g | Direction-dependent tear retention shifts with blow-up ratio |
| Elmendorf tear TD, ASTM D1922 | 400 g to 650 g | 300 g to 500 g | Improved balance in heavy-duty film |
| Haze, ASTM D1003 | 2 % to 6 % | 6 % to 14 % | Clarity for display and lamination films |
| Seal initiation temperature, ASTM F1921 | 85 °C to 100 °C | 95 °C to 115 °C | Faster form-fill-seal cycles and lower heat load |
| Tensile yield stress, ISO 527-3 | 10 MPa to 14 MPa | 10 MPa to 14 MPa | Similar stiffness at equivalent density |
For L5760H specifically, the practical manufacturing consequence is that film can be down-gauged from 50 µm to 35 µm in selected heavy-duty sack applications while retaining puncture resistance; however, down-gauging must be confirmed by ASTM D1709 dart impact and ASTM D3420 puncture testing on the actual line because orientation levels and frost-line residence time alter the final crystalline morphology. The lower seal initiation temperature permits jaw temperature reductions of 10 °C to 20 °C in high-speed vertical form-fill-seal machines when compared with a conventional butene LLDPE of equivalent density. Published data for L5760H-specific seal curves is limited in open literature, so the sealant-layer coefficient of friction and hot-tack performance should be measured on the target form-fill-seal equipment before commercial conversion. Because metallocene seal curves can show a steep hot-tack rise between 90 °C and 110 °C, the seal jaw setpoint should be held within ±5 °C of the validated target to avoid weak seals or stringing.
When L5760H replaces conventional Ziegler-Natta LLDPE in high-speed form-fill-seal applications
Substitution is not a direct drop-in. Because metallocene LLDPE has a more Newtonian viscosity curve, extrusion pressure at a given screw speed can be 5 % to 15 % higher than a conventional LLDPE with the same melt index. The extruder drive temperature can rise if the screw is undersized; motor load should be monitored, and the temperature profile may need to be flattened or reduced in the feed section. Film lines with a die gap wider than 2.5 mm may produce hazy surfaces and unstable melt curtains; a die gap below 2.0 mm is desirable. The resin’s lower melt strength means maximum take-off speed may become bubble-instability-limited rather than extruder-limited. A dual-lip air ring or internal bubble cooling is required for sustained output above 120 kg/h on a 200 mm die. Compared with high-pressure LDPE, L5760H yields higher tensile strength and improved dart impact but lower melt extensibility; it is therefore blended with LDPE at 10 wt% to 20 wt% in some high-throughput film lines to restore bubble stability without losing seal performance.
Primary conversion platforms for L5760H are blown-film extrusion for heavy-duty shipping sacks, agricultural greenhouse film, frozen-food packaging, and high-clarity lamination film. In heavy-duty sacks, the combination of high dart impact and high Elmendorf TD tear allows down-gauging from 50 µm to 35 µm in selected structures if the converter verifies puncture resistance by ASTM D3420 on the production film. In frozen-food packaging, the low seal initiation temperature permits higher sealing speeds on vertical form-fill-seal machines and reduces heat transfer into temperature-sensitive product. In lamination film, the low haze and controlled crystallinity support optical appearance of reverse-printed structures. Cast-film conversion is also possible; cast die temperatures of 230 °C to 250 °C are typically used to reduce draw resonance, and line speed is limited by melt extensional behaviour rather than output percentage.
Regulatory status for food-contact film is not determined by the base resin alone. In the European Union, the finished film must meet the migration limits of Regulation (EU) No 10/2011. In the United States, olefin polymers may fall under 21 CFR 177.1520 when the finished article is intended for food contact; hexane-extractable and xylene-extractable limits are dependent on polymer density and melting behaviour. The L5760H supplier’s product compliance statement should be requested for the exact additive package. REACH compliance under EC 1907/2006 requires confirmation of substances of very high concern in the delivered granule; a SVHC-free statement may be batch-specific. RoHS Directive 2011/65/EU restricts lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers, but the resin is not typically the source of these substances unless contaminated through downstream colourants or processing aids. No halogen-free declaration is implied without batch-level certification.
Differentiation from other Qilu mLLDPE products is made on melt-flow and density coordinates. A lower melt-index mLLDPE would be selected for thick blown film or extrusion blow moulding where melt strength is the limiting variable; a higher melt-index mLLDPE would be selected for cast film or coating where low draw resistance is required. L5760H should not be blended with high levels of low-molecular-weight process aids or waxes without re-qualification of coefficient of friction and seal performance, because additive migration can block the film surface over storage time. Compression-set and creep data are not routinely published for this grade; if the application involves sustained load at temperatures above 60 °C, long-term performance should be evaluated on the converted film. Published data for L5760H-specific ageing and sealing curves is limited in open literature, so commercial conversion should be preceded by trials on the target line and with the intended masterbatch.
