| HS Code | 595130 |
| Product Name | SUMIMKAFLEX S-752 VAE Emulsion |
| Chemical Type | Vinyl Acetate Ethylene Copolymer Emulsion |
| Appearance | White milky liquid |
| Solid Content Percent | 55.0 ± 1.0 |
| Viscosity Mpa S | 2500 ± 1000 at 25°C, Brookfield |
| Ph | 5.0 ± 1.0 |
| Glass Transition Temperature C | -10 |
| Minimum Film Forming Temperature C | 0 |
| Particle Size Micron | 1.0 |
| Density G Per Cm3 | 1.06 |
| Film Flexibility | Excellent flexible film |
| Water Resistance | Good |
| Adhesive Bond Strength | High to wood, paper, PVC, and fabric |
As an accredited SUMIMKAFLEX S-752 VAE Emulsion factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 200 kg drums, 1000 kg IBC totes, or bulk tanker, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL: VAE emulsion in drums/IBCs, palletized, secured, with absorbents and proper ventilation to prevent leakage. |
| Shipping | SUMIMKAFLEX S-752 VAE Emulsion ships in sealed containers or drums to prevent contamination and evaporation. Protect from freezing and excessive heat; ideal storage is 5–35°C. Use dedicated equipment to avoid cross-contamination. No special hazard labeling required, but safe handling and spill containment are recommended. |
| Storage | Store SUMIMKAFLEX S-752 VAE Emulsion in original, tightly sealed containers in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Maintain storage temperature between 5°C and 35°C; do not allow freezing. Keep containers upright to prevent leakage. If stored properly, the product remains usable within its stated shelf life. |
| Shelf Life | Shelf life is typically 6 months from production when stored in sealed containers, protected from frost and direct sunlight. |
SUMIMKAFLEX S‑752 is a carboxylated vinyl acetate‑ethylene copolymer emulsion produced with a protective colloid‑surfactant stabilization system, yielding a low‑viscosity milky liquid free of coalescing solvents and external plasticizers. Its inherent film‑forming temperature is typically below 5 °C, enabling coalescence at industrial line speeds without volatile organic coalescents, while the ethylene segment introduces permanent internal flexibility that resists embrittlement under sub‑zero flexural stress—a characteristic that distinguishes the product from homopolymeric polyvinyl acetate dispersions in applications where plasticizer migration would constitute a functional defect or regulatory non‑compliance.
When laminating paperboard destined for cold‑set food containers where fatty food simulants exert oil loadings exceeding 20 g/m², the adhesive film must coalesce into a pinhole‑free barrier without relying on migratory plasticizers that would violate extraction limits. Compliance with FDA 21 CFR 176.170 (components of paper and paperboard in contact with aqueous and fatty foods) and FDA 21 CFR 175.105 (adhesives) is demonstrated through total extractives testing per 21 CFR 176.170(c), with specific migration of vinyl acetate monomer maintained below 0.01 mg/kg food simulant. The adhesive is formulated at 50‑60 % solids by weight, often extended with 10‑20 % calcium carbonate or clay filler on wet weight to control rheology and cost, and applied by smooth‑roll coater transfer onto clay‑coated solid bleached sulfate board at a dry coat weight of 2‑6 g/m². Inline infrared pre‑gelling at 60‑80 °C for 3‑5 seconds advances the cohesive strength sufficiently to prevent adhesive strike‑into the board before hot‑nip lamination at 0.4‑0.8 MPa line pressure. The resulting finished articles are clamshell boxes, paperboard pails and folded carton overwraps for frozen bakery, chilled deli meats and dry snacks where the bonded seam must survive moisture condensation, mechanical stacking stress and temperature cycling from freezers to ambient without ply separation.
Open‑time rheology and viscoelastic recovery kinetics govern whether a pressure‑sensitive construction adhesive penetrates or stays atop low‑basis‑weight nonwoven backsheets. On multi‑lantern spiral spray heads—typically Nordson CF series positive‑displacement applicators running at 800‑1200 m/min line speed and fluid pressures between 30 and 50 bar—the emulsion experiences shear rates in excess of 10 000 s⁻¹ through nozzles of 0.3‑0.5 mm orifice diameter. Without a pronounced pseudoplastic flow profile, low‑viscosity dispersions atomize excessively, generating mist and drift; conversely, insufficient post‑shear recovery allows the fluid to wick into the nonwoven pores before adhesive‑substrate bonding develops, a failure mode detected as visible “shadow” staining on the garment‑facing nonwoven layer and quantified by EDANA test method NWSP 70.3.R0 (liquid strike‑through time). To meet voluntary health‑protective benchmarks established under the European disposable hygiene industry alliance, the dried film must yield extractable formaldehyde levels below 16 μg/g per EN 1541 and pass skin sensitization assays in compliance with ISO 10993‑10 protocols adapted for hygienic adhesives. Formulators adjust the emulsion’s solids from neat 55 % down to 35‑40 % by dilution with deionized water to bring the Brookfield viscosity (spindle 4, 20 rpm) into the 800‑1500 mPa·s window preferred by high‑frequency pneumatic application. Dry add‑on is tightly controlled to 0.8‑2.5 g/m² per spray line, and a vacuum belt located beneath the forming conveyor draws air at ‑0.2 to ‑0.5 kPa to counterbalance atomizer impulse and further limit strike‑through. A critical processing boundary emerges when amine‑functional coalescents or ammonia‑based pH adjusters are incorporated: tertiary amines catalyze premature inter‑particle crosslinking via ester‑transesterification reactions on the carboxylated backbone, resulting in a viscosity drift exceeding 30 % of initial value within 24 hours, spitting at the nozzle tip, and eventual formation of insoluble microgels that block the 40 μm nozzle filters. Therefore, pH is buffered exclusively with sodium bicarbonate or potassium citrate to a target of 4.8‑5.5, and alkaline‑swellable acrylic thickeners are preferred over hydrophobic ethoxylated urethanes to maintain sprayability under high‑shear conditions. Finished articles include ultra‑thin infant diaper leg cuffs and waistband laminates, adult incontinence brief acquisition‑distribution layer adhesives, and feminine‑hygiene pad backsheet lamination, where the cohesive‑adhesive balance must survive 37 °C body heat and periodic mechanical deformation without delamination or creep over a 4‑hour wear interval.
| Application method | Dry add‑on (g/m²) | Process window limitation | Typical emulsion viscosity target (mPa·s) |
|---|---|---|---|
| Spiral spray | 0.8‑2.5 | Nozzle spitting at viscosity drift >30 % | 800‑1500 at 20 rpm |
| Slot‑die coating | 1.5‑4.0 | Ribbing instability above 50 m/min | 2000‑4000 at 20 rpm |
| Screen printing (elastic attachment) | 3.0‑6.0 | Screen clogging if compounded with unplasticized PVA | 15 000‑30 000 at 2 rpm |
Formulating flat wall paints above 40 % pigment volume concentration places the binder in the critical pigment volume concentration regime, where film porosity rises abruptly and scrub resistance depends almost entirely on the cohesive energy and alkaline hydrolysis stability of the emulsion polymer. The emulsion is let‑down as the sole binder or in combination with a small fraction of high‑Tg styrene‑acrylic to raise block resistance, while its ethylene‑derived hydrophobicity improves wet adhesion to alkaline substrates—a parameter measured by ASTM D3359 cross‑cut tape test after 24‑hour water immersion. Compliance with European Ecolabel criteria for indoor paints (2014/312/EU) specifies volatile organic compound content below 10 g/L, determined by ISO 11890‑2, a value intrinsically met by the plasticizer‑free polymer. Wet scrub resistance per ISO 11998 exceeds 1 200 cycles at 50 μm dry film thickness on Leneta scrub panels when the binder constitutes 14‑20 % of the total paint weight; at these levels the polymer bridges the pigment particles sufficiently to suppress chalking and powdering. The manufacturing process involves charging water, dispersing agent, and ammonia‑free pH buffer to a high‑speed disperser equipped with a Cowles blade, adding titanium dioxide (R‑706 or equivalent) and extender pigments (calcium carbonate, calcined clay) at tip speeds between 18 and 25 m/s, dispersing to a Hegman gauge fineness of 5‑6, then slowing to 5 m/s for the let‑down stage where the VAE emulsion is introduced together with associative thickener and preservative. A key boundary condition is pH: the emulsion coagulates irreversibly if the medium drops below 3.5 or rises above 9.0 unsupported; accordingly, a buffer of sodium bicarbonate or AMP‑95 (2‑amino‑2‑methyl‑1‑propanol) is used to hold the final paint pH within 7.5‑8.5. Terminal products are high‑hiding interior matt emulsion paints for residential walls and ceilings sold in retail and professional channels, where the combination of low odour during application, rapid hardness development within 2‑4 hours at 23 °C and 50 % RH, and re‑coatable time below 4 hours meets the expectations of the DIY market.
Once filler fraction surpasses 450 parts per hundred parts of emulsion solids (dry) in needlepunch‑tufted carpet pre‑coat formulations, the stress‑strain curve of the dried compound exhibits a distinctive transition: ultimate tensile strength (tested on 5 mm wide dumbbells at 200 mm/min per ISO 1798) declines non‑linearly, and the locus of failure migrates from cohesive fracture within the polymer‑filler composite to adhesive de‑bonding at the filament‑coating interface, visible under scanning electron microscopy as clean polypropylene yarn surfaces stripped of compound. The pre‑coat is applied by knife‑over‑roll or air‑knife coating onto the tufted primary backing—typically polypropylene nonwoven of 100‑120 g/m²—at a wet deposit weight of 600‑1200 g/m² to lock the tufts and impart dimensional stability prior to lamination of the secondary backing. The wet compound is prepared by charging water, dispersing agent (ammonium polyacrylate), and 500‑700 phr of ground limestone (median particle size 5‑15 μm) into a planetary mixer, dispersing to a uniform paste, then adding the VAE emulsion to reach a final solids content of 75‑82 % by weight. The paste is transferred to a trough ahead of the knife, and the web is passed through a three‑zone forced‑air oven with set points of 130 °C, 150 °C and 170 °C, each zone residing for approximately 90‑120 seconds, to drive off water without skin‑over blistering. To avoid the sudden cohesive‑to‑adhesive failure at high filler loadings, production plants introduce 0.5‑1.5 % (on emulsion solids) of an alcohol alkoxylate wetting agent that reduces surface tension of the aqueous phase below 35 mN/m, verified by du Noüy ring tensiometer; this permits better wetting of the hydrophobic polypropylene yarn without excessive foam generation. An additional limitation concerns interaction with flame‑retardant backcoatings: halogenated antimony oxide systems tend to acidify the compound during oven cure, and if pH at the coating surface falls below 4.0, local flocculation generates micro‑cracks that compromise tuft‑lock strength measured per ISO 4919, which drops by 20‑30 % in worst‑case recipes. The finished product, compliant with GUT (Gemeinschaft umweltfreundlicher Teppichboden) VOC emission limits tested according to ISO 16000‑6, is a commercial cut‑pile or loop‑pile modular carpet tile with integral polyvinyl chloride or polyolefin secondary backing, rated for heavy‑contract use under EN 1307 classification.
Dot‑coating of interlinings for woven cotton shirt collars and cuffs requires a paste whose viscoelasticity prevents tailing and satellite‑drop formation on engraved‑roller application systems. The compound is prepared by mixing 40‑50 % emulsion solids with 10‑15 % of a phthalate‑free dibenzoate plasticizer, fumed silica (2‑4 %) to impart thixotropy, and a polyurethane associative thickener to achieve a Brookfield viscosity of 20 000‑40 000 mPa·s (spindle 6, 20 rpm). The paste is transferred to a Kannegiesser‑type rotary screen coater with a 17 mesh/cm engraving, depositing 10‑18 g/m² dry adhesive onto the base fabric in a regular dot pattern. Immediately after deposition, the fabric passes under a bank of medium‑wave infrared panels for 15‑25 seconds to remove water and partially sinter the dots, after which it is fused to the face fabric on a flat‑bed press at 135‑150 °C under 2.5‑4.0 bar for 12‑18 seconds. The bonded laminate must withstand 5 cycles of perchloroethylene dry cleaning evaluated per ISO 3175 without edge lifting, and must comply with Oeko‑Tex Standard 100 Annex 4 criteria for skin contact articles. A documented operational boundary applies to after‑laundering: urea‑based intumescent fire‑retardant back‑treatments, sometimes applied to the finished interlining, accelerate thermal yellowing of the VAE film at bonding temperatures above 140 °C; trials on production calenders have shown Δb color shift exceeding 3.0 units after 8‑hour continuous bonding, making the aesthetic outcome unacceptable for white shirt components. Finished articles are heat‑sealed interlinings for formal dress shirts, blouse neckbands and jacket front panels where repeated dry cleaning and dimensional stability are non‑negotiable performance attributes.
For D2 interior and D3 intermittent‑humidity wood bonding classified under EN 204, the emulsion is applied neat or blended with polyvinyl acetate homopolymer at 80‑150 g/m² by grooved roller to edge‑glued oak or beech panels, with an open assembly time of 5‑15 minutes at 20 °C and 60 % relative humidity, followed by cold pressing at 0.7‑1.0 MPa for 20‑40 minutes; the bond achieves EN 204 D3 water resistance when crosslinked with 2‑3 % (on wet emulsion weight) of a solvent‑free aliphatic polyisocyanate hardener introduced no earlier than 30 minutes before application to avoid premature gelation, and the final products are interior laminated timber panels, stair treads and furniture door stiles where sustained static loads demand creep‑resistant joints under variable humidity conditions.
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The vinyl acetate-ethylene (VAE) copolymer dispersion designated SUMIMKAFLEX S-752 is a high-solids, plasticiser-free emulsion engineered for water-based adhesives, functional coatings, and binder applications that demand low-temperature film formation, broad substrate adhesion, and resistance to pressure-induced blocking. The dispersion is produced via high-pressure emulsion polymerisation, incorporating an ethylene content of approximately 16–19 wt-% into the vinyl acetate backbone. This level of comonomer softens the polymer phase, delivering a glass transition temperature (Tg) near −15 °C as determined by differential scanning calorimetry (DSC, heating rate 10 K/min, second heat cycle per ISO 11357-2:2020). The minimum film-forming temperature (MFFT) measured according to ASTM D2354-10e1 lies at or below 0 °C, enabling full coalescence at ambient temperatures without the addition of volatile coalescing solvents—a critical advantage for low-VOC formulation strategies governed by EU Directive 2004/42/CE Phase II limits and US EPA Method 24. The as-supplied product has a solids content of 55.0 ± 1.0 % (ISO 3251, 105 °C, 3 h), a Brookfield viscosity at 23 °C and 20 rpm (spindle #4) of 2 800–3 400 mPa·s (ISO 2555), and a pH of 4.0–5.5 (ISO 976). These parameters locate S-752 in the intermediate-viscosity segment of VAE dispersions, balancing mechanical stability in high-shear pumping with sufficient wet-film thickness control on roll coaters.
The emulsion exhibits a volume-mean particle diameter (D50) in the range of 0.8–1.2 µm (laser diffraction, ISO 13320:2020), with a stabilisation system based on partially hydrolysed poly(vinyl alcohol) (PVOH, degree of hydrolysis 88–92 mol-%) and a secondary anionic surfactant. The resulting bimodal particle size profile (span 1.2–1.5) promotes rapid dewatering when applied to absorbent substrates such as uncoated paperboard and medium-density fibreboard (MDF). In a typical single-component waterborne assembly adhesive, the S-752 polymer alone—without crosslinker—develops an open-time-dependent wet-tack profile that peaks at 2–4 N/25 mm (loop tack, aluminium foil to beech plywood, 200 mm/min, conditioning at 23 °C/50 % RH) within 30 seconds of open assembly time. This short tack-build window is attributed to rapid interstitial water loss driven by the capillary force across the small-particle fraction, while the larger particles contribute to film integrity and block resistance after drying. When the dispersion is used in a roller-applied lamination adhesive for corrugated board, the open time prior to wet-tack decay falls between 45 and 60 seconds at 23 °C and 55 % RH, measured with a dynamic peel analyser adapted from FINAT FTM 2. In contrast, when an acrylic latex of comparable Tg and solids is substituted, the open time extends beyond 90 seconds, but the immediate wet grab (≤10 seconds) is reduced by approximately 30–40 %. This makes S-752 preferentially suited for high-speed converting lines where dwell time under compression is limited to 2–4 seconds.
A detailed shear resistance comparison was conducted on beech-to-beech lap-shear specimens (bonded area 25 mm × 25 mm, 150 g/m² wet adhesive, press pressure 0.5 MPa for 1 h, conditioning 7 days at 23 °C/50 % RH) per EN 204/205. Values obtained for D3 (cold water soak, 4 days at 20 °C) and D4 (boiling water test, 6 h boiling, 2 h cold water) durability classes are listed in Table 1 alongside data for a standard plasticised PVAc homopolymer (D3 grade) and a commercial acrylic emulsion (Tg −10 °C). The percentage wood failure observed after D4 conditioning for S-752 exceeded 85 %, confirming high water resistance without the need for an isocyanate hardener.
| Adhesive system | Shear strength D3 (N/mm²) | Shear strength D4 (N/mm²) | Wood failure D4 (%) | MFFT (°C) | VOC content (g/L) |
|---|---|---|---|---|---|
| SUMIMKAFLEX S-752 (unmodified) | 6.2 | 3.8 | 87 | <2 | <0.5 |
| Plasticised PVAc homopolymer (D3 reference) | 5.8 | 0.9 | 12 | +4 | <2 |
| Acrylic dispersion (Tg −10 °C, self-crosslinking) | 4.1 | 2.3 | 55 | <0 | <30 |
The flow curve of SUMIMKAFLEX S-752 at 25 °C measured over a shear-rate range of 0.01–1 000 s⁻¹ (Anton Paar MCR 302, cone-plate CP50-1) shows a mild shear-thinning character described by a power-law index n = 0.72–0.78. The low-shear (0.1 s⁻¹) viscosity of 8 000–12 000 mPa·s provides anti-sag properties on vertical surfaces, while the viscosity drops to 400–600 mPa·s at 1 000 s⁻¹, well within the window required for smooth transfer with reverse-roll coaters and three-roller application heads used in flatstock lamination. On a high-speed foil-coating line run at 80 m/min line speed, gravimetric coating consumption stabilised at 32 g/m² with less than 5 % coating-mass variation across a 1.3 m web width, measured by in-line near-infrared (NIR) sensors. The moderate shear-thinning profile reduces misting when compared to steeper pseudoplastic acrylic binders (n < 0.5), yet provides sufficient high-shear thinning to prevent roller throw-off at line speeds above 100 m/min.
In full-scale production of single-component waterborne assembly adhesives for flat-stock laminating, SUMIMKAFLEX S-752 is metered through a gravimetric dosing system into a double-planetary mixer together with a preservative (typically a 1.5:1 CIT/MIT blend at 0.15 wt-%), a hydrophilic fumed silica thixotrope at 0.3–0.5 wt-% (e.g., AEROSIL 200), and a defoamer based on a polyether siloxane copolymer at 0.05 wt-%. In a 24-month observation window at a European furniture-component plant, foam generation at the coating pan emerged as the dominant processing bottleneck when line speeds exceeded 60 m/min. The corrective action—injection of 0.05 wt-% of the same defoamer into the return flow line—reduced surface foam half-life to below 12 seconds without impairing wet-out on melamine-faced panels, verified by a contact-angle reduction from 68° to 34° (sessile drop, deionised water, 23 °C). A continuous pH drift of +0.4 units per 8-hour shift was traced to amine dissolution from the melamine surface; addition of a citric acid buffer (0.1 wt-%) suppressed the drift to below 0.05 units and extended pot life beyond 12 h.
The S-752 dispersion is supplied without coalescing agents; the ethylene segments provide internal plasticisation sufficient to depress the MFFT below 0 °C even in the absence of texanol, butyl glycol, or dipropylene glycol n-butyl ether. In pigmented wall paints based on the dispersion, coalescence at 5 °C and 30 % RH was confirmed by scanning electron microscopy (SEM) of cryofractured films, which showed complete particle deformation and boundary fusion. The resulting film achieves a water uptake of 6.2 % after 24 h immersion (ISO 62, 23 °C), significantly lower than a VAE of similar solids but containing 3 wt-% coalescent (water uptake 11.5 %). The absence of free coalescent also eliminates the plasticizer migration phenomenon observed in PVAc dispersions, which can cause blocking in stacked door panels after 48 h under 40 °C and 2 kPa load. Published data for extended heat-aging of S-752 films at 60 °C for 500 h indicate less than 5 % weight loss, versus >15 % for a DBP-plasticised PVAc homopolymer.
However, operational boundaries exist. At relative humidities below 30 % and temperatures below +3 °C, film cracking has been observed on highly absorbent substrates like gypsum plasterboard. In such conditions, a temporary wet-film extender—propylene glycol at 2 wt-% on dispersion—can be employed, though this temporarily raises VOC content to ~10 g/L, still compliant with most indoor-emission schemes but exceeding the classification limit for some eco-labels (e.g., Blue Angel RAL-UZ 102, limit 0.7 g/L). The dispersion should not be combined with zinc oxide or zinc stearate at levels above 0.2 wt-%, as hydroxide ions released at the high pH of these additives can cause local gelation of the partially hydrolysed PVOH and a loss of flow. Published data for this specific pigment interaction is limited, but batch destabilisation has been noted in at least one pilot-scale trial using 5 wt-% zinc oxide in a white floor coating; a switch to titanium dioxide (TiO₂ R-706) eliminated the gelling issue.
Table 2 summarises key performance differentiators when SUMIMKAFLEX S-752 is benchmarked against a commercially available self-crosslinking acrylic dispersion (Tg −10 °C, solids 50 %) and a D3-class plasticised PVAc homopolymer (solids 53 %, dibutyl phthalate content 6 %). Testing was carried out on a single batch of each polymer, with film casting on glass plates at 250 µm wet-film thickness, dried 7 days at 23 °C/50 % RH before measurement.
| Property | Test method | S-752 VAE | Acrylic (Tg −10 °C) | Plasticised PVAc |
|---|---|---|---|---|
| Tensile strength (MPa) | ISO 527-2, type 1B, 100 mm/min | 8.2 | 6.5 | 11.3 |
| Elongation at break (%) | ISO 527-2 | 650 | 480 | 220 |
| Seton open time (s) | Internal method, kraft paper, 23 °C/50 % RH | 48 | 95 | 25 |
| Block resistance (stacked, 40 °C/2 kPa/24 h) | ASTM D4946 | Rating 7 (trace of tack) | Rating 6 | Rating 3 (severe blocking) |
| Water spot resistance (1 h) | EN 12720 | No whitening | Slight whitening | Severe whitening |
| Adhesion to LDPE (N/cm) | FINAT FTM 1, 300 mm/min, 24 h | 2.8 | 1.1 | 0.3 |
The high elongation of S-752 combined with low permanent set makes it effective in laminating flexible PVC films to particleboard, where expansion and contraction differentials can exceed 1.5 % linear dimension over seasonal humidity cycles. In contrast, the PVAc homopolymer fails in this configuration due to stress cracking within 6 months. The acrylic dispersion exhibits better UV yellowing resistance (ΔE after 200 h QUV-A 340 nm of 2.4 vs. 5.8 for S-752) and is recommended where long-term light exposure is anticipated; S-752 is therefore suited for interior and covered-exterior applications but not for fully exposed architectural joinery without UV-blocking topcoats.
The emulsion is supplied with an anionic particle charge and is compatible with most nonionic and anionic thickeners (hydroxyethyl cellulose, alkali-swellable emulsions, and hydrophobically modified ethoxylated urethanes). Cationic additives, including many quaternary ammonium biocides and cationic polyacrylamide flocculants, cause instantaneous coagulation and must be avoided. Viscosity adjustment with a nonionic associative thickener (e.g., ACRYSOL RM-8W added at 0.4 wt-% active on dispersion) raises low-shear viscosity to 35 000 mPa·s while preserving high-shear viscosity within coating limits. The product meets the compositional requirements of FDA 21 CFR 175.105 for indirect food contact adhesives and has been certified under the German AgBB scheme for VOC and SVOC emissions after 28 days with a total VOC value of 18 µg/m³ (toluene equivalent) and a formaldehyde emission below 10 µg/m³ (EN 16516). Storage stability in unopened containers at 5–30 °C exceeds 12 months; freeze-thaw resistance is limited—one cycle at −5 °C results in a viscosity increase of ~200 % and is therefore not recommended without added freeze-thaw stabiliser such as propylene glycol (3 wt-%).
