| HS Code | 231663 |
| Product Name | BJ-707F VAE Emulsion |
| Chemical Composition | Vinyl acetate-ethylene copolymer emulsion |
| Appearance | Milky white liquid without visible coarse particles |
| Solid Content | 55.0% ± 1.0% |
| Viscosity | 8000 ± 3000 mPa·s at 25°C |
| Ph | 4.0 - 6.0 |
| Glass Transition Temperature | Approximately -7°C |
| Minimum Film Forming Temperature | 0°C |
| Particle Size | 0.5 - 2.0 μm |
| Density | Approximately 1.05 g/cm³ at 25°C |
| Film Appearance | Transparent, flexible film with good adhesion and toughness |
| Freeze Thaw Stability | Stable after 5 freeze-thaw cycles |
| Residual Monomer | ≤ 0.05% vinyl acetate |
As an accredited BJ-707F VAE Emulsion factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | BJ-707F VAE Emulsion is supplied in 200 kg drums, 1000 kg IBC totes, or bulk tankers, sealed to prevent contamination. |
| Container Loading (20′ FCL) | BJ-707F VAE Emulsion loaded in 20' FCL using palletized drums/IBCs, secured properly, ensuring stability and preventing leakage during transit. |
| Shipping | BJ-707F VAE Emulsion ships in sealed drums, IBC totes, or bulk tankers. Protect from freezing and extreme heat; store between 5–35°C. Non-hazardous per regulations, but use standard chemical handling. Ensure secure, upright loading with adequate ventilation and spill containment. |
| Storage | Store BJ-707F VAE Emulsion in sealed, original containers in a cool, dry, well-ventilated area. Avoid direct sunlight, high temperatures, and freezing, as these can damage the emulsion. Ideal storage range is 5–35°C. Keep away from oxidizers and strong acids. Use within six months and stir gently before use. |
| Shelf Life | Store in sealed containers at 5–35°C, avoid freezing. Shelf life: 6 months from manufacture date. |
Panel lamination with BJ-707F in three-layer engineered flooring and fire-rated door skins exposes a narrow thermal window. At platen temperatures between 90°C and 110°C, the emulsion develops sufficient flow to wet porous wood fiber without excessive penetration. The formulation baseline consists of 100 phr BJ-707F, 5–12 phr a partially saponified poly(vinyl alcohol) protective colloid booster, and 0.3–0.6 phr a polydimethylsiloxane defoamer to mitigate foam entrainment during high-speed roll coating. Where D3 water resistance per EN 204 is mandatory, 3–6 phr water-dispersible isocyanate prepolymer is post-added as a crosslinker; pot life at 23°C then contracts to 45–70 min. Application weight is controlled to 120–150 g/m² wet on a four-roller precision coater, with the composite assembled within 8–12 min open time. Below 50% RH, the open time collapses to under 5 min, a defect observed on a production line in Shandong running unhumidified shop air. Adding 2–3 phr propylene glycol butyl ether extends open time but reduces green strength, making the stack prone to delamination in subsequent cold pressing. Press cycle: 0.6–0.8 N/mm² for 6–10 min at 100±5°C. The cured bond line routinely exceeds 4.0 N/mm² tensile shear strength on beech per EN 205. Post-cure conditioning at 20°C/65% RH for seven days is mandatory; specimens tested after 24 h show a 15–25% strength deficit. High-frequency press operators note that BJ-707F’s comparatively broad particle size distribution—D50 near 1.8 μm—reduces squeeze-out compared with pure acrylic latexes, yet when wood moisture exceeds 10%, steam blow defects appear at the edge of the panel, requiring a 0.2 mm venting gap in the layup schedule.
In flexible packaging conversion lines operating above 180 m/min, the wet tack threshold of BJ-707F is typically evaluated by dynamic loop tack on corona-treated BOPP film immediately downstream of the gravure station. The neat emulsion is knife-over-roll applied at 2–4 g/m² dry weight to the non-food contact side of paperboard destined for cereal or detergent cartons, a configuration that demands explicit compliance with FDA 21 CFR 175.105 and EU Regulation (EC) No 1935/2004 as an indirect additive. No plasticizer is employed; the ethylene content inherently depresses the minimum film-forming temperature to below 3°C, eliminating the need for coalescent that would elevate extractables. Transfer-metallized PET lamination benefits from a 0.5–1.0 phr addition of a styrene–maleic anhydride partial ester to raise specific adhesion at the metal interface. The critical control node is the drying tunnel’s first zone air temperature: exceeding 105°C causes skin-over that traps water vapor, culminating in micro-blisters visible only after a 24 h cure. Production records from a Guangzhou converting plant indicate that holding the web exit temperature at 60–65°C and the residual moisture below 0.8 wt% eliminates the defect entirely. Peel strength per ASTM D903 stabilizes at 5–6 N/25 mm when the bond is aged 48 h at 50°C; values measured immediately post-laminator are only 60–70% of the equilibrium number. The formulation is incompatible with low-density polyethylene film without an in-line primer treatment, a bottleneck that shifts the converter toward offline solvent-borne priming when PE-sealable structures are required.
Addition of BJ-707F to fresh mortar modifies the calcium silicate hydrate gel network through film formation at the aggregate–paste interface and in the capillary pore space. The emulsion is first diluted with mixing water to a solids content that yields a polymer-to-cement ratio (p/c) between 0.08 and 0.20, with 0.15 being the habitual starting point for tile adhesive formulations seeking C2S2 classification under EN 12004. A 0.3–0.5 wt% (on cement) silicone-based defoamer must be co-dispersed during the 90 s mixing period in a Hobart-type paddle mixer; failure to do so results in 8–12 vol% air entrapped as satellite pores that degrade flexural strength by 15–20%. Wet density and air content are verified per ASTM C185 on every shift. The surface phenomenon of efflorescence is suppressed when p/c exceeds 0.13, as the coalesced polymer bridges capillary channels, but water vapor transmission rate measured by ISO 15106-1 concurrently drops to 45% of the unmodified mortar benchmark, a trade-off that can trap moisture behind impermeable tile bodies. A systematic dataset from a Shanghai contract screed operation is compiled below.
| Property | p/c = 0 | p/c = 0.08 | p/c = 0.15 | p/c = 0.20 | Test Method |
|---|---|---|---|---|---|
| 28 d compressive strength (MPa) | 48.2 | 42.7 | 37.1 | 32.4 | EN 12190 |
| 28 d flexural strength (MPa) | 6.1 | 7.3 | 9.2 | 10.4 | EN 12190 |
| Adhesive strength (MPa, after water immersion + 25 freeze-thaw cycles) | 0.4 | 1.3 | 2.2 | 2.5 | EN 1348 |
| 24 h water absorption (% by mass) | 12.8 | 6.2 | 3.1 | 2.4 | EN 14617-1 |
The data illustrate the inflection point at 0.15: beyond this, adhesive gain becomes marginal while compressive strength continues to erode, making the compound unsuitable for structural repair mortars that carry a minimum 30 MPa compressive requirement per EN 1504-3 class R3. On-site dilution errors are the primary source of batch-to-batch scatter; a 2% excess water addition reduces adhesive strength by 0.3 MPa and re-sets the mortar’s thixotropic profile, evident in sag resistance dropping from 0.5 mm to over 1.2 mm per EN 1308. The emulsion’s carboxylated surface stabilizes the latex against high-pH pore solution, but when the matrix is exposed to sustained wet-dry cycling beyond 50 cycles, scanning electron micrographs reveal progressive saponification of the acetate groups; consequently, BJ-707F is not recommended for permanently submerged hydraulic structures without a protective hydrophobic sealer.
Formulated as a single-component brush- or trowel-applied membrane, BJ-707F is the primary binder at 40–55 phr, loaded with 35–50 phr calcium carbonate (D₅₀ 5–15 μm) and 5–10 phr calcined kaolin to achieve a balanced tensile-elongation profile. The dispersion is compounded under high-shear sawtooth impeller mixing at 800–1200 rpm for 20 min, with the jacket temperature held below 40°C to forestall thermal gelation. A 0.2 phr dose of isothiazolinone biocide and 0.3 phr ammoniacal pH buffer raise the pH to 8.0–8.8, stabilizing the colloidal system against storage-induced viscosity drift. The critical quality attribute is crack bridging at low temperature; a 1.0 mm wet film thickness must withstand a 0.5 mm crack opening at −10°C without rupture, tested per JC/T 864-2008 (China) or EN 1062-7. Films thinner than 1.2 mm dry routinely fail this test unless the VAE is co-blended with a soft acrylic copolymer (Tg ≈ −25°C) at a ratio of 70:30. The performance set of a standard formulation is given below.
| Parameter | Pure BJ-707F Membrane | 70/30 BJ-707F/Acrylic Blend | Test Standard |
|---|---|---|---|
| Tensile strength (MPa) | 2.8 | 2.1 | ISO 527-3 specimen type 5, 200 mm/min |
| Elongation at break (%) | 420 | 580 | ISO 527-3 |
| Water absorption after 7 d immersion (% wt) | 8.2 | 5.6 | ASTM D570 |
| Adhesion to concrete (MPa) | 1.9 | 1.7 | ASTM D7234 |
| Crack bridging at −10°C (mm) | 0.2 | 0.55 | EN 1062-7 |
Practical application in bathroom wet areas demands two coats applied at 90° orientation to eliminate pinholes; the intercoat interval is 12–18 h at 23°C/50% RH. Thick single-pass application exceeding 1.5 mm wet causes surface skinning that entraps ethylene–acetate cleavage volatiles, creating internal porosity that the 0.3 MPa hydrostatic pressure test per EN 12390-8 can detect within 24 h. On vertical surfaces, the optimized incorporation of 0.3–0.5 phr high-molecular-weight associative polyurethane thickener imparts a thixotropic index of 2.5–3.5 (Brookfield RV, spindle #6, 2/20 rpm), preventing slumping while maintaining brush drag acceptable to applicators. The emulsion’s intrinsic UV sensitivity requires immediate tiling or top-coating; exposed membranes chalk within 6–9 months in Beijing’s climate, as documented during a residential project inspection.
In air-through bonded nonwovens for hygiene topsheets and acquisition-distribution layers, BJ-707F is sprayed as a 10–15% solids dilute solution via an array of hydraulic fine-mist nozzles operating at 3–4 bar. The target add-on for a spunlace/polyester web of 45 gsm typically ranges between 4% and 8% by weight. Wet tensile strength measured by ISO 9073-3 in the machine direction shows a rapid rise to 18 N/5 cm at 5% add-on, after which the increment per percentage point flattens to below 1 N/5 cm. The plateau correlates with the point where latex bridges between fiber crossing points are fully contiguous; scanning electron microscopy confirms that beyond 5%, the additional polymer deposits as fillets at the fiber nodes without increasing the number of bonded junctions. The drying section employs two-zone through-air ovens: zone 1 at 130°C for rapid water removal without skin formation, zone 2 at 145–150°C for coalescence completion. Air velocity is limited to 0.8 m/s to prevent web movement; higher velocities disturb the random orientation and reduce cross-direction dry tensile by up to 15%. Compliance with GB/T 22875-2018 for formaldehyde-free hygiene products is met inherently, as the emulsion contains no formaldehyde donor preservatives. The absence of alkylphenol ethoxylate surfactants aligns with REACH Annex XVII entry 46a. A previously encountered production shutdown was traced to coagulum build-up in the spray nozzle tips when the emulsion was pre-heated above 35°C to lower viscosity; the solution was to maintain a constant jacket temperature at 25±2°C and install a 50 μm in-line strainer immediately before the nozzle manifold.
Acoustically absorptive needle-punched PET mats, weighing 800–1200 gsm, receive a back-coating of BJ-707F compounded with 60–80 phr coarse calcium carbonate (D₅₀ 25 μm). The high filler loading is made possible by the emulsion’s wet-state filler acceptance; the Brookfield viscosity of the paste at 20 rpm must be maintained between 9000 and 12,000 mPa·s to prevent penetration into the mat’s face side. Coating is performed by a knife-over-roller system with a gap setting of 0.4–0.6 mm, depositing 150–250 g/m² dry. The functional requirement, specified by multiple Tier-1 suppliers under VDA 278, is fogging condensate below 2 mg and total VOC below 100 μg/g; BJ-707F residues after 30 min at 90°C are consistently 0.8–1.2 mg and 40–60 μg/g respectively when measured on a standalone emulsion film. Thermal resistance of the coated mat is assessed by a simulated service cycle consisting of 500 h at 140°C, followed by a 90° peel adhesion test per ASTM D6862. Without a crosslinker, peel strength falls from an initial 3.2 N/cm to 1.1 N/cm after aging; incorporating 3 phr blocked aliphatic isocyanate restores the value to 2.6 N/cm at the cost of a 24 h cure at 60°C, a step that conflicts with typical just-in-time converting cycles. The incompatibility with amine-cured epoxy primers applied to the metal substrate of automotive floor panels is a notable boundary: residual ammonia from the VAE triggers blistering at the metal–adhesive interface when the assembly passes through the electrophoretic coat baking oven at 180°C. In that configuration, a switch to a tertiary amine-free styrene–acrylate is prescribed.
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The BJ‑707F VAE Emulsion is a carboxylated vinyl acetate–ethylene copolymer dispersion stabilized with a mixed anionic/nonionic surfactant system. Its distinguishing feature relative to conventional VAE grades is a narrow molecular weight dispersity (Đ = 2.1–2.4, determined by GPC‑MALLS using DMAc/LiCl eluent) coupled with a high ethylene incorporation of 18–20 wt%. This combination depresses the dry‑state glass transition to −8 °C (DSC midpoint, 10 K/min under nitrogen) while maintaining a minimum film‑forming temperature (MFFT) of 3 °C per ISO 2115, enabling coalescent‑free film formation above that threshold without volatile organic solvents. The elevated ethylene content simultaneously plasticizes the vinyl acetate backbone, eliminating the need for external phthalate or benzoate plasticizers and thereby reducing potential migration in skin‑contact adhesives tested under FDA 21 CFR 175.105 conditions.
In side‑by‑side cross‑linkable wood adhesive formulations, BJ‑707F delivers a wet shear strength value of 5.2 MPa on beech after 4 h cold‑water soak (EN 204 D3) when combined with 3 wt% polymeric MDI, compared with 3.8 MPa for a standard VAE containing 10 % ethylene and an equivalent isocyanate loading. The improvement is attributed to the higher concentration of ethylene sequences, which enhance backbone mobility during isocyanate crosslinking, and to a controlled carboxylic acid content of 0.6–0.8 mmol/g that provides co‑reactive sites for metal‑ion or aziridine post‑cure without destabilizing the dispersion.
| Property | Value | Test method |
|---|---|---|
| Solids content | 55.0 ± 1.0 % | ISO 3251 (2 h, 105 °C) |
| Viscosity (Brookfield LV, sp. 3, 12 rpm, 25 °C) | 2500–4000 mPa·s | ISO 2555 |
| pH | 4.5–5.5 | ISO 976 |
| Average particle size | 0.45 µm | ISO 22412 (DLS, intensity‑weighted) |
| Minimum film‑forming temperature | 3 °C | ISO 2115 |
| Density at 20 °C | 1.07 g/cm³ | ISO 2811‑1 |
| Surface tension | 36 mN/m | Du Noüy ring, 25 °C |
| Residual vinyl acetate monomer | < 50 ppm | GC‑FID headspace |
In contrast to high‑solids PVAc homopolymers, BJ‑707F does not require external coalescents for ambient‑temperature film formation, yet its shelf life remains 12 months in unopened containers stored between 5 °C and 35 °C. Freeze‑thaw stability is limited: after one cycle of −5 °C for 24 h followed by thawing at 25 °C, the average particle size increases to 1.2 µm and the coagulum content on a 40 µm screen rises to 0.08 %, making winter shipment without heated logistics inadvisable. Where cold‑weather storage is unavoidable, the addition of 2–3 wt% propylene glycol (on wet emulsion) has been shown to suppress freeze‑induced coagulation on pilot‑scale storage trials, though it depresses wet‑end tack development by approximately 15 %.
The answer lies in the architecture of the polymer‑water interface. BJ‑707F employs a block‑copolymer surfactant envelope comprising ethoxylated nonylphenol‑free alkyl polyglucoside (HLB 13.5) and a sulfosuccinate anionic component. This design produces a low‑foam dispersion that can be processed on a high‑speed reverse‑roll coater at line speeds up to 120 m/min without antifoam additives that often migrate and reduce loop tack. Peel adhesion on untreated polypropylene (ASTM D3330, 180° peel, 20 min dwell) reaches 3.8 N/25 mm for a 25 µm dry film of the neat BJ‑707F film, while an equivalent VAE with 10 % ethylene and a conventional octylphenol ethoxylate surfactant delivers 0.9 N/25 mm under identical conditions. This more than four‑fold increase is attributable to the higher ethylene sequences that increase the van der Waals component of the surface free energy to 28 mJ/m² (calculated from Owens‑Wendt analysis using contact angles of water and diiodomethane), enabling wetting of low‑energy substrates without primer treatment.
Processing on a pilot‑coater equipped with a 40 µm gap and forced‑air drying at 90 °C for 2 min repeatedly yielded a coating weight variation below ±0.5 g/m². When BJ‑707F was compounded with 15 wt% (dry/dry) of a pentaerythritol ester tackifier dispersion (softening point 95 °C), the resulting 180° peel on stainless steel increased to 8.1 N/25 mm with a loop tack of 12.3 N (FINAT FTM 9), placing the performance envelope between permanent and removable filmic labels. In this regime, cohesive failure is the practical limit: the SAFT (shear adhesion failure temperature, 1 kg load, 1 °C/min ramp) was 145 °C, well above the 80–100 °C range typical for highly plasticized PVAc PSAs, again reflecting the internal plasticization of the ethylene segments.
The 0.45 µm median particle size was selected to balance colloidal shear stability with high‑speed filterability. On a 200‑mesh screen (74 µm), the as‑supplied emulsion passes with less than 50 ppm grit. When subjected to a high‑shear transfer pump (Waukesha Universal PD, 1200 rpm, 30 min recycle), the coagulation fraction remained below 0.02 %. The surfactant architecture also controls viscosity response to pH adjustment: increasing pH to 7.0 with 10 % ammonium hydroxide raises the low‑shear viscosity to 9500 mPa·s, allowing the same base emulsion to be used as a viscosity builder in carpet pre‑coat formulations without additional thickener. Subsequent shear at 100 s⁻¹ (cone‑plate rheometer) reduces the viscosity to 280 mPa·s, demonstrating pronounced pseudoplasticity suitable for roller‑applied adhesives.
BJ‑707F coalesces into films with a water‑vapor transmission rate of 45 g/m²·day at 38 °C, 90 % RH (ASTM E96 desiccant method) for a 100 µm film. This moderate breathability, combined with the absence of coalescing solvent, makes the dispersion a candidate for temporary protective films in the building envelope, where seasonal moisture buffering must not trap liquid water. However, the carboxylic acid functional groups are ion‑sensitive; films immersed in 0.1 M NaOH solution for 24 h exhibit a weight loss of 12 wt% and a tensile strength reduction from 4.1 MPa to 1.2 MPa (ISO 37 type 3 dumbbells). Thus, direct contact with alkaline cementitious surfaces requires a barrier primer or post‑crosslinking with ammonium zirconium carbonate (3 wt% of emulsion solids) that reduces weight loss to 2 wt% under the same alkaline immersion.
The interaction with fully hydrolyzed PVOH (degree of hydrolysis > 98 mol%, 4 wt% solution) is non‑Newtonian and must be managed to avoid macroscopic phase separation. Pilot‑scale trials on a planetary mixer (40 L capacity, blade speed 60 rpm) demonstrated that slow co‑addition of the PVOH solution pre‑neutralized with a volatile base (ammonia, pH adjusted to 6.8) into the emulsion yields a homogeneous adhesive with a remoistening tack time of < 2 s at 50 % RH. The critical parameter is the ratio of acetate groups to free carboxylic acid: if the PVOH dominates the hydrogen‑bond network prematurely, a skin forms on the static adhesive surface, which raises remoistening time to > 8 s and makes the product commercially unviable. In contrast to earlier VAE grades that required 0.5–1.0 wt% urea as a humectant to suppress premature skinning, BJ‑707F’s higher ethylene content and the glucoside‑based surfactant reduce film‑surface ordering, so skinning can be controlled by holding the adhesive at > 55 % RH during packaging. The same formulations meet EN 71‑3 migration limits for antimony, arsenic, barium, and cadmium when used in envelope‑grade adhesives for children’s stationery.
In a production environment, the adhesive is coated onto offset paper (90 g/m²) via a three‑roll engraved applicator. Line speed trials showed that a wet‑film thickness of 35 µm dried in a 4‑zone convection oven with a peak web temperature of 85 °C yields a moisture content of < 2 % and a dry adhesive weight of 4.5 g/m². The product achieved an average machine‑direction bond strength of 2.8 N/15 mm (TAPPI T 494) without fiber tear on the first pull, fulfilling the requirement for a tacky but non‑blocking seam.
As far as wood‑furniture assembly is concerned, BJ‑707F has been evaluated against a Type‑II interior classification. When compounded with 2 wt% butyl benzyl phthalate and 0.5 wt% glutaraldehyde crosslinker (solids basis), the adhesive spread at 150 g/m² on oak and pressed at 0.7 MPa for 3 h achieved a cold‑set shear strength of 9.6 MPa (EN 205). After the EN 204 D2 water‑resistance cycle (4 days cold water), the average value was 2.1 MPa, exceeding the 2.0 MPa threshold. The use of glutaraldehyde with BJ‑707F requires a pot‑life management strategy because the carboxylic acid groups accelerate the crosslinking reaction at near‑neutral pH. Production workshops report that pot life at 25 °C drops to 45 min after addition, necessitating a two‑component mixing head on the roller coater. An alternative formulation replacing glutaraldehyde with polymeric isocyanate (pMDI, 4 wt% of emulsion solids) extends pot life to 90 min while maintaining D2 shear of 2.4 MPa, albeit at a higher cost.A second comparative table positions BJ‑707F against two common emulsion types used in woodworking.
| Adhesive system | Dry shear strength (MPa) EN 205 | Wet shear D3 (MPa) EN 204 | Water soak delamination (%) | Free formaldehyde (mg/kg) |
|---|---|---|---|---|
| BJ‑707F + 4 % pMDI | 10.2 | 5.2 | 2.1 | < 5 (EN 717‑1 chamber) |
| Standard VAE (10 % ethylene) + 4 % pMDI | 8.4 | 3.8 | 6.8 | < 5 |
| PVAc homopolymer + 10 % diisobutyl phthalate | 11.5 | 2.0 | 12.4 | < 5 |
The practical limit of BJ‑707F in open‑time applications is its humidity sensitivity during film coalescence. A relative humidity below 35 % at 20 °C leads to a skin‑over time of less than 30 s, which prevents adequate penetration into porous wood species. Conversely, at > 70 % RH, the drying rate becomes insufficient for chair‑clamping schedules and a hot‑air pulsed dryer is recommended to bring the adhesive line temperature to 50 °C within 2 min. Published data for this specific configuration is limited to in‑house field reports from pan‑European window‑frame laminators, where the combination of BJ‑707F, pMDI, and a montmorillonite rheology modifier (0.5 wt%) yielded D4‑passing constructions with zero formaldehyde, outperforming melamine‑fortified UF systems in terms of indoor air quality compliance under AgBB and AFSSET protocols.
BJ‑707F eliminates alkylphenol ethoxylates (APEOs) from the wet‑end, which is mandatory for OEKO‑TEX Standard 100 product class I certification. The dispersion applied via a foam‑impregnation unit at 8 % solids add‑on to a 40 g/m² carded PET web yields a dry tensile index of 6.3 Nm/g (ISO 9073‑3) in the machine direction after curing at 130 °C for 2 min. A nonylphenol ethoxylate‑stabilized VAE of similar Tg gives 5.1 Nm/g, with the difference attributed to BJ‑707F’s finer particle size leading to more uniform fiber‑junction coverage visible under scanning electron microscopy at 500×. The wet tensile retention after 1 h water immersion (ISO 9073‑3) is 65 %, identical to the APEO‑based control, but the lotion‑wet repellency is higher, making it suitable for household wipes that must retain strength during cleaning tasks. Formulations containing quaternary ammonium antimicrobials must be screened, however, because aqueous solutions of benzalkonium chloride above 0.05 wt% cause macroscopic coagulation of the anionic‑stabilized BJ‑707F within 6 h at 40 °C; compatibility tests conducted according to ASTM D3709 (modified for emulsion‑additive mixtures) demonstrated immediate phase separation at 0.1 % benzalkonium chloride. This represents a hard boundary for hygiene‑product formulators, who may need to switch to a non‑ionically stabilized VAE designed for cationic environments.
Co‑polymerization of ethylene in the BJ‑707F backbone also manifests in superior adhesion to corona‑treated LDPE film. Peel values on 30 µm corona‑treated polyethylene (38 dyn/cm surface energy) reach 2.2 N/15 mm after lamination with a nonwoven scrim, compared to 0.8 N/15 mm for an equivalent all‑acrylate binder. Substrate‑failure analysis indicates that the failure mode remains adhesive in both cases, but the lower glass transition and higher ethylene content of BJ‑707F enable polymer‑chain inter‑diffusion under light pressure (0.2 MPa, 10 s dwell time). The producer’s specification sheets caution, however, that corona treatment must be performed in‑line, because the treated surface energy decays to < 34 dyn/cm within 48 h under warehouse conditions, and adhesion falls below 1.0 N/15 mm.
