| HS Code | 717060 |
| Product Name | CW97-719 Ultra-Low-Tg VAE Emulsion |
| Chemical Family | Vinyl Acetate Ethylene (VAE) Copolymer |
| Appearance | White milky liquid |
| Solid Content | 55 ± 1% |
| Viscosity Brookfield 25 C | 500 - 2000 mPa·s |
| Ph | 4.5 - 6.5 |
| Glass Transition Temperature Tg | -30°C |
| Particle Size | 0.5 - 2.0 μm |
| Film Flexibility | Excellent, crack-free at low temperatures |
| Elongation At Break | > 800% |
| Tensile Strength | > 5 MPa |
| Water Resistance | Good, with hydrophobic characteristics |
| Freezing Thawing Stability | Stable through 5 cycles |
| Mechanical Stability | Excellent, high shear stable |
As an accredited CW97-719 Ultra-Low-Tg VAE Emulsion for Extreme Flexibility Applications factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | CW97-719 Ultra-Low-Tg VAE Emulsion is packaged in 200 kg drums and 1000 kg IBC totes for safe handling and stability. |
| Container Loading (20′ FCL) | 20′ FCL: CW97-719 VAE emulsion loaded in IBCs/drums, securely braced, stable water-based product, no special transport hazard. |
| Shipping | CW97-719 is shipped in sealed drums or IBC totes to prevent contamination and skinning. Protect from freezing and extreme heat; store between 5–40°C. Ensure containers remain upright, secure during transport, and are used promptly upon opening to maintain emulsion stability and performance. |
| Storage | Store CW97-719 in original, sealed containers in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Maintain temperatures between 5°C and 40°C to prevent freezing or coagulation. Keep containers tightly closed to avoid contamination and skinning. Stir gently before use. Use within manufacturer-recommended shelf life. |
| Shelf Life | CW97-719 VAE emulsion has a shelf life of 6 months from manufacture when stored sealed, cool, and frost-free. |
During pilot-scale multi-layer extrusion lamination of low-density polyethylene to aluminum metallized films, standard EVA or acrylic binders fail peel strength requirements below -20°C due to rapid modulus elevation. Substitution with an ultra-low-Tg VAE such as CW97-719, whose differential scanning calorimetry midpoint registers below -32°C, maintains chain mobility within the amorphous ethylene-rich phase even under frozen storage conditions. The binder is applied via a 200 LPI anilox cylinder on a solvent-free laminator at a coating weight of 2.2–3.0 g/m² dry, yielding immediate green tack to both corona-treated polypropylene and aluminum foil without aromatic isocyanates. For indirect food contact under FDA 21 CFR 175.105 and EU Regulation (EU) No 10/2011 Annex II, migration testing at 40°C for 10 days in 95% ethanol remains below the 10 mg/dm² overall migration limit, provided free monomer content is maintained below 0.05 wt%. Formulation addition of CW97-719 occupies 88–94 wt% of the liquid adhesive compound, with the remainder comprising defoamer and a high-solids tackifier dispersion to adjust open time. On a 300 m/min line, web tension must be limited to 85 N to prevent film distortion, because the low-Tg adhesive displays elongational creep that causes tunnel defects when cooling cylinders are set below 8°C. Finished structures include retortable pouches for frozen seafood, ice cream flow-wrap, and peelable lidding films for polypropylene trays, where ISO 11339 peel values exceed 4.5 N/15 mm after 28-day aging at -25°C.
Flexible cementitious waterproofing slurries for concrete balconies and wet rooms demand crack-bridging capacity at service temperatures that frequently drop to -15°C in Northern European climates. A two-component system—powder component containing CEM I 42.5R at 450 kg/m³, silica sand graded 0.1–0.5 mm, and liquid component comprised of CW97-719 at a polymer-cement ratio (p/c) of 0.45–0.55—yields a continuous polymer film that envelops hydrating cement grains and unreacted clinker phases. Compliance rests on EN 14891:2017 for liquid-applied water impermeable products under ceramic tiling, specifically the crack-bridging ability at -5°C per EN 1062-7 method B, where films containing CW97-719 sustain crack opening beyond 2.1 mm before cohesive failure. The mixed compound is applied at a wet-film thickness of 1.8 mm using a notched rubber squeegee in two coats, with intermediate drying of 45 minutes at 23°C and 50% RH. A critical processing boundary emerges: if the polymer-cement ratio exceeds 0.60, the excess free VAE coalesces into a discrete surface layer that blocks water-vapor transmission and leads to blistering during the tile adhesive setting period. Conversely, below a p/c of 0.35, the low-Tg film cannot accommodate shrinkage stresses from cement hydration, and microcracks propagate along the interfacial transition zone visible under 500× SEM. Terminal products include tanking membranes under natural stone, waterproofing beneath screeds in underfloor heating systems, and flexible renders for cellular lightweight concrete blockwork.
Disposable absorbent hygiene articles rely on composite textiles where a microporous polyethylene film is thermally or adhesively laminated to a spunbond polypropylene nonwoven. CW97-719 is spray-applied as a discontinuous dot pattern through a 0.18 mm nozzle manifold at a coating speed of 180 m/min onto the film side immediately after micro-void formation by calcium carbonate stretching. Application weight is controlled at 1.0–1.8 g/m² dry, representing 92–96 wt% of the lamination adhesive, with the balance being a polyvinyl alcohol protective colloid stabilizer to prevent nozzle plugging. Regulatory adherence to EU Medical Device Regulation (EU) 2017/745 and ISO 10993-5 cytotoxicity testing is satisfied when residual vinyl acetate monomer is below 5 ppm and formaldehyde content below 16 µg/g by the acetylacetone method. The extremely low Tg of the emulsion eliminates the need for dibutyl phthalate or acetyl tributyl citrate plasticizers that would otherwise migrate to the lipid layer of skin over an 8-hour wear cycle. During the combining nip, roll temperature must be kept between 32°C and 38°C: below this range, the dot pattern fails to flow and wet the polypropylene fiber; above 40°C, the adhesive penetrates entirely through the nonwoven, striking through to the contact roll and causing wrap-up that halts production. Finished laminates exhibit a 180° T-peel strength greater than 1.2 N/25 mm per WSP 401.1 and maintain adhesive integrity after a 12-hour saline soak at 37°C, essential for adult incontinence briefs, newborn diaper closure strips, and surgical drape fenestration reinforcements.
Pressure-sensitive adhesive formulations for recycled corrugated box sealing tapes that must remain repositionable on moist substrates at 2°C exploit the inherent tack of ultra-low-Tg VAE without extraneous hydrocarbon resin addition. CW97-719 is compounded at 64–72 wt% of the total wet adhesive, blended with a bisphenol A-free rosin ester dispersion at 18–24 wt% and an acetylenic diol dynamic wetting agent at 0.4 wt% to achieve equilibrium surface tension below 32 mN/m. The adhesive transfer coating onto silicone-coated release liner uses a comma blade with a wet gap of 80 µm, followed by a three-zone drying tunnel with the final zone at 85°C for 12 seconds to drive off moisture without triggering premature inter-particle diffusion that would diminish room-temperature tack. Approval for direct food contact of dry foodstuffs (tape applied to flour sacks and produce cartons) is available under FDA 21 CFR 176.170 and BfR Recommendation XXXVI when the dry extractive fraction is below 0.5 mg/in². Shear adhesion failure temperature (SAFT) plateaus at 93°C when measured on stainless steel panels in accordance with ASTM D4498-07, a value adequate for warehouse storage but insufficient for oven-exposed applications; this is a non-negotiable upper service boundary. Tape constructions using 30 µm biaxially oriented polypropylene facestock and CW97-719-based adhesive are employed for case sealing of frozen poultry boxes, closure tabs on diaper packaging, and splicing strips in high-speed newspaper printing where rapid adhesion to newsprint is mandatory and plasticizer migration would cause ink set-off.
Tufted carpet and nonwoven parcel shelf trim in vehicle cabins are back-coated to lock fibers and impart moldable stiffness, yet conventional styrene-butadiene latexes release volatile condensates that accumulate on windshield interiors. A formulated compound comprising CW97-719 at 82–88 wt% on a wet basis, aluminum trihydrate fire retardant at 65 phr, and a melamine-formaldehyde crosslinker at 2.5 phr meets VDA 278 for VOC values below 100 µg C/g and fogging condensate below 250 µg/g when cured at 140°C for 3 minutes in a through-air oven. Application onto polyester needlepunch of 400 g/m² basis weight is accomplished via a double-knife over roller coating head, where the first knife meters an immersion coat at 600 g/m² wet and the second knife smooths the surface to control pile penetration. The ultra-low Tg permits compound elongation exceeding 600% per DIN EN ISO 13934-1, ensuring that molded wheel arch liners survive installation flexing at -30°C without coating fracture. A production-scale limitation manifests during color changeover: the low-Tg polymer adsorbs carbon black pigment so tenaciously that a solvent flush of the doctor blade assembly and backing roll for 45 minutes with N-methyl-2-pyrrolidone is required to eliminate “ghost marks” on the next batch. End-use components include trunk side trim panels (where the coating eliminates the need for a separate NVH pad), dashboard insulator backings, and A-pillar cover fabrics that must pass FMVSS 302 horizontal burn rate requirements of less than 100 mm/min.
Monolithic elastomeric roof coatings sprayed onto metal decking and aged single-ply membranes demand sustained elongation after 1,000 hours of QUV-A exposure per ASTM G154 Cycle 1. CW97-719 is loaded at 46–52 wt% of the total formulation, extended with an aqueous chlorinated paraffin dispersion to raise solids while preserving flexibility, and thickened to a brushable consistency of 12,000 mPa·s via alkali-swellable acrylate associative rheology modifier. The coating is airless-sprayed at 200 bar tip pressure through a 0.021-inch reversible orifice to deposit 1.2 mm wet film thickness per pass, achieving total dry film thickness of 0.8 mm after two passes. Compliance with ASTM C836-18 for fluid-applied elastomeric roofing is demonstrated by tensile adhesion in peel at 22 N/25 mm to rusted steel after water immersion for 7 days, as well as low-temperature flexibility around a 6 mm mandrel at -26°C without cracking, per ASTM D522/D522M-17 Method B. A notable process conflict arises when the substrate temperature exceeds 45°C during application: rapid skin formation traps water vapor that later erupts into pinpoint crater defects visible under 10× magnification, reducing hydrostatic pressure resistance below the 30 psi minimum required by ASTM D751 Method A. Pour-applied prototypes for ponding water plaza decks and walkway membranes on EPS insulation have also been validated, provided a polyester fleece reinforcement of 40 g/m² is embedded between coats to distribute strain beyond the intrinsic 850% elongation at break of the polymer matrix.
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The emulsion designated by model code CW97-719 belongs to a class of vinyl acetate-ethylene (VAE) copolymers engineered to deliver film formation at temperatures where conventional waterborne binders undergo brittle fracture. Its core differentiation lies in an exceptionally low glass transition temperature—determined by differential scanning calorimetry according to ISO 11357-2:2020 at a midpoint of −38 °C—achieved through a deliberately elevated ethylene domain content exceeding 30 wt% of the copolymer backbone. This architecture imparts permanent macromolecular mobility without reliance on migratory external plasticizers, a design principle that resolves the long-term embrittlement observed in plasticized poly(vinyl acetate) homopolymer or acrylic copolymer films. The aqueous dispersion is stabilized with a poly(vinyl alcohol) protective colloid system, yielding a fine particle size distribution (mean volume diameter 0.28 µm, laser diffraction per ISO 13320:2020) that enables high-shear processability in coating, spraying, and saturation applications. Residual volatile organic compound content is maintained below 0.5 g/L when tested according to EPA Method 24, and the product is formulated without alkylphenol ethoxylates, meeting the criteria of EU Regulation (EC) No 1907/2006 (REACH) Annex XVII entry 46a.
| Parameter | Value | Test Method |
|---|---|---|
| Solids content | 54.5–55.5 % | ISO 3251:2019 (2 h, 105 °C) |
| pH (as supplied) | 4.6–5.2 | ISO 976:2013 |
| Brookfield viscosity (RVT, spindle #4, 20 rpm, 23 °C) | 1800–3200 mPa·s | ISO 2555:2018 |
| Minimum film-forming temperature (MFFT) | <−30 °C | ISO 2115:2000 |
| Glass transition temperature (Tg, DSC midpoint) | −38 °C | ISO 11357-2:2020 |
| Mean particle size (D50) | 0.28 µm | ISO 13320:2020 (laser diffraction) |
| Free monomer (vinyl acetate) | <200 ppm | ISO 13741-1:2023 (headspace GC) |
| Surface tension | 42–46 mN/m | Du Noüy ring, 23 °C |
When formulating with CW97-719, the user must account for its pronounced shear-thinning behavior. At shear rates exceeding 1000 s⁻¹—conditions routinely encountered in airless spray tips (e.g., Graco 0.017–0.021-inch orifice) or high-speed rotor-stator mixers—viscosity can drop to less than 500 mPa·s, which facilitates atomization but demands rapid viscosity recovery in the applied film to prevent sagging on vertical substrates. This thixotropic profile is modifiable through the addition of hydrophobically modified alkali-swellable emulsions (HASE) or associative polyurethane thickeners; however, such additives must be selected for compatibility with the poly(vinyl alcohol) colloidal stabilizer to avoid macroscopic phase separation during storage at 40 °C over 28 days as per ASTM D7149-05(2021).
Unlike conventional VAE binders with Tg values near 0–5 °C, CW97-719 coalesces into a continuous film on substrates maintained at −20 °C without coalescing solvents, a performance characteristic validated by crack-free film formation on chilled stainless steel panels in accordance with ASTM D823-18 (blade application, 150 µm wet film). The ultra-low Tg is a direct consequence of ethylene incorporation during emulsion polymerization, where the molar fraction of ethylene units disrupts the regularity of the vinyl acetate backbone enough to shift the cooperative segmental motion into the deep subzero domain. In practice, this allows single-component, solvent-free waterproofing membranes to be spray-applied in cold-climate conditions, eliminating the need for heated hoses or job-site addition of fugitive coalescents such as texanol. The resulting film exhibits an elongation-at-break of >900 % when tested at −20 °C according to ISO 37:2017 (Type 2 dumbbell, 200 mm/min), retaining more than 80 % of the room-temperature value. This retention metric is critical for crack-bridging waterproofing products designed to comply with EN 1062-7:2004 dynamic crack-bridging classes A4 or A5 at −20 °C, where rigid epoxy-cement hybrids or styrene-acrylic dispersions typically fail below −5 °C because they approach their Tg and enter the glassy state.
For cementitious two-component flexible slurries—where CW97-719 is combined with a powder component containing ordinary Portland cement (CEM I 42.5R), silica sand (0–0.5 mm), and a polycarboxylate superplasticizer—the recommended polymer-to-cement ratio (p/c) lies in the range 0.45–0.65 by mass. Below p/c 0.40, the continuous polymer phase becomes insufficient to bridge drying-shrinkage microcracks, as observed in restrained ring tests per ASTM C1581-20; above p/c 0.70, the compressive strength of the cured mortar may drop below 8 MPa at 28 days, which is below the minimum for load-bearing applications per EN 1504-2 structural repair mortars. Batch variability in cement reactivity (particularly the sulfate carrier form) must be monitored by measuring setting time extension. Fresh mortar with CW97-719 typically exhibits a pot life of 2.5–4 hours at 23 °C, measured by a slump flow loss <20 % from initial (EN 12350-5:2019), after which the accelerating effect of aluminate phases on VAE destabilization can cause an abrupt rise in viscosity due to calcium-catalyzed polymer bridging. Avoid blending with cement containing zinc oxide or amine-based set accelerators; such additives complex with the acetate groups of the protective colloid, leading to coagulation within 10–30 minutes of mixing.
In nonwoven binder applications, CW97-719 is applied via foam impregnation or print bonding to cellulosic or polyester fiber webs intended for interlining, shoe counters, or automotive interior trim where permanent softness and cold flex are demanded. The binder is typically catalysed with a latent acid donor—ammonium chloride or diammonium phosphate at 0.5–1.0 %(w/w) on binder solids—to activate crosslinking of the N-methylol functionality introduced via copolymerized N-methylolacrylamide (NMA), achieving a thermoset character after drying at 130–150 °C for 3–5 minutes. The influence of cure temperature on dry-cleaning resistance was evaluated by perchloroethylene extraction per ISO 3175-2:2018: a cure at 130 °C for 4 min yielded a weight loss of 12 %, whereas 150 °C for 3 min reduced weight loss to 3.5 %, indicating that full crosslink density requires careful heat transfer calibration on the stenter frame. The ultra-low Tg ensures that even the crosslinked network retains sufficient free volume for segmental motion, providing a flexural rigidity (bending length) of 2.8 cm on a 50 g/m² polyester nonwoven, compared to 4.7 cm for a styrene-acrylate binder of equivalent add-on (25 % solids on fabric weight).
| Property | CW97-719 (Ultra-Low-Tg VAE) | Standard VAE (Tg 0 °C) | Acrylic Copolymer (Tg −25 °C, plasticized) | SBR Latex (Tg −30 °C, crosslinked) |
|---|---|---|---|---|
| Tg by DSC (ISO 11357-2) | −38 °C | 0 °C | −25 °C* | −30 °C |
| Elongation after 7 d at 130 °C (ISO 37, ret. %) | >90 % | 40–60 % (plasticizer loss) | 60–80 % (plasticizer volatilization) | 85 % (oxidative stiffening) |
| QUV-B 500 h ΔE color shift (ASTM G154) | 2.1 | 1.8 | 1.2 | 8.7 (surface chalking) |
| Adhesion to untreated PET film (peel, N/25 mm, ISO 11339:2022) | 12.3 | 8.5 | 6.1 | 10.8 |
| Plasticizer requirement for −20 °C flexibility | none | 10–15 phr | 5–8 phr (internal, not migrated) | none |
*Tg of acrylic measured after plasticizer equilibration; unplasticized Tg typically −10 °C.
The absence of external plasticizer in CW97-719 eliminates the failure mechanism of plasticizer migration into adjacent porous substrates—a known cause of delamination in multi-layer textile laminates and adhesive debonding in automotive dashboards after 1000 hours of heat aging at 90 °C (DIN 75201 fogging test, gravimetric deposit <0.5 mg for CW97-719 versus 3.2 mg for a plasticized acrylic). Simultaneously, the ethylene-rich polymer backbone introduces a degree of inherent hydrophobicity not present in fully hydrolyzed polyvinyl acetate, reflected in a water absorption of 12 % after 24 hours immersion (ISO 62:2008) for a 0.5 mm thick cast film, compared to 25 % for a VAE homopolymer of equivalent molecular weight. This property is advantageous in waterproofing membranes but limits alkali resistance when the film is exposed to saturated calcium hydroxide solutions (pH > 12.5) for periods exceeding 28 days; under such conditions, incremental hydrolysis of acetate ester groups can occur, reducing molecular weight and tensile strength by approximately 15–20 %. Therefore, when designing cementitious coatings for permanent immersion in alkaline water, supplementary polymer modification or a top-coat is recommended.
Storage stability requirements demand protection from freezing. Freeze-thaw cycling (−10 °C for 16 hours, +23 °C for 8 hours, 5 cycles per ASTM D7149) of CW97-719 without antifreeze additives results in an irreversible viscosity increase of 300–500 % and formation of macroscopic grits due to ice crystal-induced coagulation. The product must be stored at +5 °C to +40 °C, and if inadvertent freezing occurs, it should not be mechanically re-dispersed for critical applications. For nonwoven mills operating in unheated warehouses during winter, insulation or slight dilution with a 5 % solution of ethylene glycol (on product weight) can mitigate freezing risk, but preliminary compatibility testing with the crosslinker system is mandatory to avoid side reactions with N-methylol groups. Unopened containers in original packaging have a shelf life of 12 months from the date of manufacture, after which a slight upward drift in pH (to 5.5–6.0) may occur due to slow acetate hydrolysis; this shift does not impair film properties but can interfere with acid-catalyzed crosslinking, requiring pH re-adjustment with citric acid to 4.8 ± 0.2.
When CW97-719 is utilized in spray-applied sound-dampening viscoelastic layers—laminated between two metal sheets in automotive body panels—the low Tg shifts the maximum loss factor (tan δ, measured by dynamic mechanical analysis at 1 Hz per ISO 6721-1:2019) to −25 °C, providing effective vibration damping within the typical vehicle operating temperature envelope. Damping performance rivals that of asphalt-based bitumen pads but with a 60 % weight reduction at equal thickness. However, published data for this specific constrained-layer configuration using CW97-719 remain limited to laboratory-scale trials; correlation to full-vehicle NVH testing is ongoing. In contrast, its performance in textile-to-textile lamination adhesives is already validated at production scale on flat-bed laminating lines (belt speed 8–12 m/min, nip pressure 3–5 bar, drying tunnel set to 110 °C and 130 °C zones) where the low heat activation energy of the VAE film enables bonding of heat-sensitive synthetic velour to polyurethane foam without foam collapse.
