CW40-937 High-Solids VAE Emulsion for High-Performance Applications

Why Does High Machine Speed Laminating on Polyethylene-Coated Kraft Require VAE with Elevated Solids?

In food-contact laminated paper constructions—aqueous emulsion-to-printing press inline speeds exceeding 120 m/min—CW40-937 is compounded into a pressure-acrylic-reinforced formulation at 85–92 wt% of the liquid adhesive, with the remaining fraction comprising a polyurethane associative thickener (0.15–0.35 wt% solid on total) and a silicone-based defoamer dispersion activated at 0.12 wt%. The driving requirement is instantaneous green tack on corona-treated LDPE at 38–42 mN/m surface energy, where the evolved water content of a 65% solids VAE compared to a 55% solids conventional type reduces the latent evaporation load per linear metre by approximately 18%, directly measurable as a 10–15 m/min line speed gain on a Köenig & Bauer Rotajet gravure-to-laminating bridge with a 1.4 m web width. Compliance track follows the indirect additive migration model under EU 10/2011 Annex I and FDA 21 CFR 175.105, with specific migration limits for vinyl acetate monomer established at 0.02 mg/kg simulant per CEN/TS 13130-3 using 3% w/v acetic acid for 10 days at 40 °C, and the overall migration limit confirmed below 10 mg/dm². Viscosity must be maintained within a narrow depression: the formulated adhesive set to 1,000–1,400 mPa·s Brookfield LV #4/60 rpm at 20 °C is shear-thinned through a chambered doctor blade onto an anilox roll engraved at 45 L/cm, depositing 3.5–5.0 g/m² dry coat weight. Dwell time inside the lamination nip heated to between 45–55 °C is approximately 0.6 s; CW40-937-borne instantaneous tack arises from a room-temperature Young's modulus of 2.8 MPa coupled with an ethylene content of approximately 14–16 wt%, which shifts the peak loss modulus temperature to approximately −12 °C, avoiding brittle peel at freezer temperatures. Typical peel strength on PE/board laminates after 24 h conditioning per ASTM D903 averages 2.8 N/25 mm with paper tear as the dominant failure mode, while boil-in-bag retort resistance at 98 °C for 30 min is achievable with an additional 0.5 wt% zinc ammonium carbonate insolubilizer added immediately before application. End-article formats range from microwavable popcorn bags with a highly pigmented white overprint to spiral-wound composite cans transporting dry infant formula powders.

Comparative peel strength and heat resistance data for CW40-937-based laminating adhesive on three commodity barrier substrates, tested after **72 h** ambient cure at **23 °C**, **50% RH**, coat weight **4.2 g/m²** dry
Substrate type	Peel strength ASTM D903 (N/25 mm)	Shear adhesion failure temperature, SAFT, 0.5 kg static load (°C)	Relevant migration standard
Corona-treated LDPE 40 μ / kraft 80 g/m²	2.6–3.1	69–73	FDA 21 CFR 175.105, EU 10/2011
Aluminium foil 9 μ / paperboard 350 g/m²	3.8–4.4	82–86	BfR XIV, GB 9685-2016
Metallized PET 12 μ / SBS board	2.0–2.5 (ink delamination zone)	65–70	FDA 21 CFR 175.105, Swiss Ordinance 817.023.21

Comparative peel strength and heat resistance data for CW40-937-based laminating adhesive on three commodity barrier substrates, tested after 72 h ambient cure at 23 °C, 50% RH, coat weight 4.2 g/m² dry

Substrate type

Peel strength ASTM D903 (N/25 mm)

Shear adhesion failure temperature, SAFT, 0.5 kg static load (°C)

Relevant migration standard

Corona-treated LDPE 40 μ / kraft 80 g/m²

2.6–3.1

69–73

FDA 21 CFR 175.105, EU 10/2011

Aluminium foil 9 μ / paperboard 350 g/m²

3.8–4.4

82–86

BfR XIV, GB 9685-2016

Metallized PET 12 μ / SBS board

2.0–2.5 (ink delamination zone)

65–70

FDA 21 CFR 175.105, Swiss Ordinance 817.023.21

Modification of cementitious capillary waterproofing slurries for positive-side hydrostatic pressure resistance up to 1.5 bar per EN 12390-8 involves dispersing CW40-937 as the polymer modifier at a polymer-to-cement weight ratio of 0.12–0.18, replacing the conventional acrylic redispersible powder with an aqueous emulsion added to the second component of a two-part system. This substitution shifts the capillary pore size distribution evaluated via mercury intrusion porosimetry from a median pore diameter of approximately 95 nm in acrylic-modified systems to approximately 42 nm when the VAE emulsion forms an interpenetrated network, effectively suppressing water ingress under hydrostatic head for 28 days accelerated carbonation and wet-dry cycling. On-site mixing requires a low-shear helical paddle mixer operating at 300–400 rpm to prevent air entrapment at the liquid-limestone interface without breaking the emulsion’s steric stabilization; foam density exceeding 2.5% by volume in the slurry causes pinholing visible in transmitted light microscopy on 2 mm dried film sections. A common incompatibility arises when the cement component contains polycarboxylate ether superplasticizers at dosages above 0.8 wt% of binder, where the sulfate sensitivity of VAE particles leads to a rapid gelation visible as a 50% slump loss within 5 min of mixing, mandating the use of a naphthalene sulfonate-type dispersant instead. The formulation conforms to EN 14891:2017 for liquid-applied water impermeable products and the cationic dye extension test under GB/T 23445-2009, with chloride permeation after 90 days brackish water immersion per AASHTO T 259 held below 0.15% by mass of cementitious material. Factory quality assurance relies on a rotational viscometer at 20 rpm immediately after blending and again at 30 min to record the thixotropic recovery index, which must not exceed 2.8 to ensure trowel flow across vertical concrete surfaces without sagging beyond 2 mm on a 3 mm thick wet film. The cured membrane, typically applied in two cross-direction passes at 1.2 kg/m² total dry weight, is integrated into below-grade tanking on poured concrete basement walls of structures exceeding 20 m height and into seamless protection of elevator pits subjected to seasonal groundwater fluctuation.

High Solids Elastomeric Facade Coatings and the Role of Coalescent-Free Film Formation at 5 °C

In water-based elastomeric wall coatings designed to bridge static cracks up to 0.75 mm at −10 °C per ASTM D6083, CW40-937 serves as the sole binder at 38–44 dry wt% on total formulation, eliminating the need for ester alcohol coalescents that contribute to post-application VOC emission test failures under ISO 16000-9 chamber analysis with a 28-day endpoint. The high-solids nature of the emulsion (65 ±1% non-volatile) permits a PVC range of 28–35% with titanium dioxide rutile R-706 at 12 wt% and calcined kaolin at 8–10 wt%, where the dry hiding power measured by contrast ratio over a black-and-white Leneta chart exceeds 0.93 at a wet film thickness of 200 µm. Coating rheology is built on a two-thickener balanced network: a non-ionic hydrophobically modified ethoxylated urethane associative thickener introduced at 0.45 wt% active ingredient forms a transient network with the VAE particle surface, while a bentonite clay suspension at 0.2 wt% contributes high-yield stress to prevent pigment sedimentation during 14-day accelerated storage at 50 °C. Production-scale dispersion proceeds in a high-speed disk disperser with a tip speed of 18–22 m/s, grinding the pigment premix to a Hegman gauge reading below 20 µm before let-down into the VAE emulsion with gentle sweep agitation at 60–80 rpm to minimize shear-induced coagulation; the critical shear rate for destabilization has been identified at approximately 5,000 s⁻¹ using a rotational rheometer with a cone-plate geometry. Once mixed, the paint passes through a 250 μm vibrating screen before filling, with a final Stormer viscosity fixed at 90–105 KU. Low-temperature film integrity is the most frequent field failure: below 4 °C, CW40-937 films without coalescent exhibit a minimum film formation temperature of approximately 1 °C, but dew on substrate surfaces raising interfacial moisture to 92% RH causes micro-crazing in the wet film under scanning electron microscopy examination. For this reason, application specifications restrict field use to surface temperatures above 6 °C and relative humidity below 80%. The dry film fulfills eluted heavy metal requirements per EN 71-3 for child care facilities and passes the wet scrub resistance classification at Class 1 under ISO 11998 after 28 days drying, with film weight loss below 5 g/m² after 200 cycles. Finished product types include high-build textured coatings trowel-applied at 1.2–1.8 kg/m² with synthetic marble aggregate of 0.8–1.5 mm and smooth roller-grade topcoats for residential high-rise exterior insulation and finish systems.

Absorbent hygiene core integrity applications involve CW40-937 applied via intermittent spray between cellulose fluff defibrated to a Kamas mill screen opening of 8 mm and the spunbond nonwoven carrier sheet, where the adhesive add-on weight is maintained between 1.5–3.0 g/m² dry mass with a coefficient of variation below 8% across the 600 mm web width. The diluted emulsion, typically reduced to 30–35% solids with deionized water and adjusted to a viscosity of 120–180 mPa·s (Brookfield #2/50 rpm), is pumped through a ITW Dynatec or Nordson hot-melt-style slot-coating system converted for cold application, with the slot gap set at 0.1 mm and positive displacement metering at 6–12 mL/min per station. Wash-off resistance is the critical performance gate: an uncured laminate submerged in synthetic urine solution (ISO 9073-8 Similant C) for 30 min at 37 °C must retain 70% of its initial wet tensile strength in the machine direction, a threshold achieved by the interplay between the VAE’s vinyl acetate segments contributing hydrogen bonding to cellulose and the ethylene sequences providing rubbery compliance at body temperature. Crosslinking is rarely employed to avoid skin sensitization risk per OECD TG 442B local lymph node assay; the skin irritation score on reconstructed human epidermis (OECD TG 439) remains below 0.5. Manufacturing line shutdowns are regularly triggered by adhesive mist build-up on the forming belt at 8 h intervals, demanding an automated water-based cleaning cycle and re-tensioning of the polyolefin wire to a target deflection of 2.5 mm under 1 kg load. End-product formats are adult incontinence pull-ups with a 3D-engineered core and ultra-thin sanitary pads with absorbent capacity exceeding 45 mL of 0.9% saline, tested under EDANA NWSP 350.5.

When Tufted Carpet Dimensional Stability Demands a Calcium Carbonate-Filled Precoat Without Styrene-Butadiene Odor

Tufted broadloom carpet for EU Class 33 commercial wear environments integrates CW40-937 into the precoat compound at a wet binder-to-filler ratio of 100:220 dry, where the emulsion’s high solids permit a water reduced content below 12% of the total wet weight, substantially lowering the thermal load on the tenter frame. The formulation is expanded to 180–250 phr of ground limestone (D50 ≤ 5 μm) with a polyacrylate sodium dispersant at 0.25 phr active, and a chemical blowing agent of azodicarbonamide type initiated at 195–205 °C in the tunnel dryer’s second zone to achieve a closed-cell foam density of 0.35–0.45 g/cm³. Mechanical frothing via a Hansa Mixer at 2,800 rpm using counter-rotating pins incorporates 25–35% air by volume before the compound is delivered to a traversing knife-over-roll coater maintaining a 1.8 mm gap over the secondary backing of polypropylene woven tape. Curing proceeds through a five-zone hot air oven with a residence time of 5–7 min, where temperature ramping from 120 °C to 190 °C is profiled to avoid skin-over before complete foam expansion—a known defect resulting in a tuft lock stabilization loss below 85% retention after 6 months of chair castor rolling testing per ISO 10361:2015. Odor panels per VDA 270 variant B3 return a score of ≤2.5, markedly lower than carboxylated SBR alternatives, attributable to the absence of residual styrene monomer detectable via headspace GC-MS at retention time 8.2 min. Compliance verification includes REACH Annex XVII restricted substances confirmation and EUROPEAN Commission Decision 2014/312/EU on EU Ecolabel for textile floor coverings, with total volatile organic compound emissions below 0.25 mg/m³ after 28 days in an ISO 16000-6 test chamber. The filled precoat is qualified for broadloom carpet up to 4 m width as well as modular carpet tiles that feature a fiberglass stabilisation layer hot-melt bonded to the compound; tile flatness deviation per ASTM D7336 remains under 0.5 mm diagonally. During production, the major process conflict is the interaction between residual calcium ion leached from the limestone filler and the aluminium-based coagulation mechanism of process water treatment, necessitating chelating agent addition at 0.08 wt% to maintain froth density within ±0.04 g/cm³ of target.

The CW40-937 high-solids vinyl acetate-ethylene (VAE) copolymer emulsion is engineered for end-uses where elevated non-volatile content, <69 0% by mass per ISO 3251:2019, must converge with low minimum film-forming temperature and cohesive strength exceeding that of conventional 55% solids dispersions. Unlike standard VAE grades that sacrifice film integrity when formulated above 60% solids due to surfactant migration and micro-cracking, CW40-937 employs a bimodal particle size distribution and a proprietary protective colloid system to maintain a continuous, flexible polymer network at ambient cure down to 2°C. The emulsion is supplied at a Brookfield viscosity of 2 500–5 500 mPa·s (ISO 2555, spindle 4, 20 rpm, 23°C) and a pH of 4.5–5.5, and it is free of alkylphenol ethoxylates (APEO) to satisfy the EC 1907/2006 (REACH) Annex XVII restriction. In production-scale trials on twin-screw compounding extruders with L/D 44 and side-feeding of inorganic fillers, the high-solids profile permitted a 12–18% reduction in drying energy demand compared with 55% solids VAE emulsions, while maintaining equivalent wet-out on corona-treated polyethylene terephthalate (PET) films at line speeds up to 180 m/min.

What Defines the Physical Profile of CW40-937?

Typical properties determined on representative production batches; values are not specification limits.
Property	Method	Value
Solids content	ISO 3251 (2 h, 105°C)	68.0–70.0 %
Viscosity (Brookfield RVT, spindle 4, 20 rpm, 23°C)	ISO 2555	2 500–5 500 mPa·s
pH	ISO 976	4.5–5.5
Minimum film-forming temperature (MFFT)	ISO 2115	<0 °C
Density at 23°C	ISO 2811-2	~1.08 g/cm³
Particle size (d₅₀)	Laser diffraction (Malvern Mastersizer)	0.4–0.8 µm
Residual vinyl acetate monomer	Headspace GC per ISO 13741-1	<500 ppm

The high-solids construct shifts the water-load burden onto the formulator without raising the glass transition temperature (T_g) of the VAE backbone, which remains near −15°C. This allows coalescent-free film formation, critical for compliance with the EU Decopaint Directive 2004/42/EC Phase II VOC limits. Films cast from undiluted emulsion and dried for 7 days at 23°C/50% RH develop a tensile strength of 3.5–4.8 MPa and elongation at break of 600–800% when tested to ASTM D638-14 Type IV specimens at 50 mm/min. The balance of cohesion and elongation is retained after 4-week water immersion at 23°C, with weight uptake typically below 12% and no visible blushing, a performance edge over polyvinyl alcohol-stabilised VAE grades that re-emulsify under prolonged moisture exposure.

Where Does CW40-937 Outperform Standard Ethylene-Vinyl Acetate Dispersions?

In high-speed pressure-sensitive adhesive (PSA) coating on siliconised release liners, the emulsion’s high-solids character directly enables lower coating weight variability on knife-over-roll systems operated at 120–160 m/min. Trials on a 1 200 mm-wide pilot coater with forced-air drying at 90°C showed that a 68% solids CW40-937 compound, thickened with 0.3 parts per hundred of an associative polyurethane thickener, deposited 22–24 g/m² dry coat weight with a coefficient of variation under 2.5%, while a 55% solids reference VAE required 32 g/m² wet to achieve equivalent dry add-on and exhibited 6% variation due to viscosity fluctuations. The resulting PSA, transfer-coated to biaxially oriented polypropylene (BOPP) film, displayed 180° peel adhesion on stainless steel of 12–14 N/25 mm (ASTM D3330/D3330M-04 Method A) and loop tack of 10–12 N/25 mm (FINAT FTM 9). Critically, the adhesive maintained shear resistance of >72 h at 1 kg/25 mm on polished steel at 23°C, a metric where many high-solids VAE grades fail prematurely because the dense particle packing limits interdiffusion and entanglement development. CW40-937’s bimodal architecture mitigates this limitation by preserving sufficient void space for chain mobility during the early coalescence phase.

Modifying cementitious waterproofing slurries with CW40-937 at polymer-to-cement ratios (p/c) of 0.05 to 0.12 (solids on cement) reduces the water-to-cement ratio needed for workability while boosting adhesion to damp concrete substrates. In tests following EN 14891:2017, a two-component slurry incorporating p/c 0.10 achieved a bond strength after water contact of 1.1 MPa versus 0.6 MPa for an unmodified control, with the failure mode shifting from adhesive to cohesive within the cementitious layer. The emulsion must be post-added to the mixed mortar to avoid premature de-protection of the colloid by divalent cations; addition during the initial wet-out phase can induce micro-flocculation visible as granularity in the cured surface. Field data from balcony waterproofing installations in Central Europe confirmed that the p/c 0.08 formulation, applied by notched trowel at 2.5 kg/m², exhibited no through-cracking after 1 500 thermal cycles between −10°C and +50°C on a concrete slab with 0.3 mm static crack width.

Film Formation Below 0°C Without Coalescents

The MFFT of <0°C eliminates the need for high-boiling coalescing aids in exterior architectural coatings and enables application down to 2°C substrate temperature without film cracking, a requirement of EN 1062-1:2004 for exterior masonry coatings. When CW40-937 is formulated into a clear wood varnish at 45% pigment volume concentration (PVC) with a matting agent, film integrity assessed by ASTM D7306-07 (Standard Practice for Testing Low Temperature Film-Formation of Latex Paints by Visual Observation) showed continuous film at 2°C without coalescent, whereas a 55% solids VAE grade of comparable backbone composition required 2.5 wt% texanol (on total binder) to reach equivalent performance, adding 38 g/L VOC to the wet formulation. The intrinsic coalescence capability derives from the low-viscosity, mid-size particle fraction that can flow into capillary radii at the interstitial sites of the larger particles under the capillary pressure generated during the primary drying stage.

When Automotive Interior Laminates Demand Fast Set and Low Odor

Thermoforming of polyolefin foam-backed interior trims with CW40-937-based adhesives benefits from the reduced water load and the emulsion’s compatibility with blocked isocyanate crosslinkers. A water-based spray adhesive formulated with 100 parts CW40-937, 3 parts of a water-dispersible isophorone diisocyanate trimer (IPDI) prepolymer, and 0.5 parts of a polyether-modified siloxane substrate wetting agent was applied at 60 g/m² dry weight to a low-surface-energy TPO skin. After heat activation at 80°C for 45 s and lamination to a polyurethane foam core under 0.3 bar platen pressure, 180° peel strength exceeded 8 N/25 mm on a tensile tester at 300 mm/min. Odour evaluation according to VDA 270 (variant C3, 80°C) scored 2.0, and fogging per DIN 75201 Method B at 100°C/16 h yielded a photometric condensate index of <0.5 mg, meeting requirements of German OEM specifications. Published data for this specific closed-mold lamination arrangement with CW40-937 is limited outside of single-manufacturer application bulletins; however, the low residual monomer profile supports the odour findings.

Compatibility with Fillers and Rheology Modifiers

Viscosity response of CW40-937 (68% solids) with selected thickeners and filler loadings at 23°C.
Additive	Loading (parts per 100 parts emulsion)	Brookfield viscosity (mPa·s, spindle 6, 20 rpm)	Stability after 24 h
None (neat emulsion)	—	3 800	Homogeneous
HEUR associative thickener (Acrysol RM-8W)	0.3	12 500	Homogeneous
Alkali-swellable emulsion (ASE, Acrysol TT-615)	0.5 (pre-neutralised to pH 8.5)	18 000	Slight syneresis
Calcium carbonate (D₅₀ 5 µm)	150	22 000	Sediment-free
Kaolin (D₅₀ 2 µm)	80	14 700	Sediment-free

ASE-thickened systems require careful pH adjustment to avoid hydrolysis of the VAE polymer’s acetate groups; sustained pH above 9.0 leads to measurable loss of tensile strength after hot storage at 50°C for 14 days. The high-solids nature of CW40-937 also places constraints on filler pre-dispersion: when adding dry calcium carbonate directly into the emulsion under high-shear dissolver at 1 200 rpm, batch temperatures must not exceed 35°C, else skin formation in the vessel headspace and irreversible grit generation occur. In continuous static mixer lines processing 500 kg/h, inline viscosity monitoring at 300 s⁻¹ indicated optimal dispersion below 4 500 mPa·s shear viscosity without a secondary defoamer, whereas addition rates above 180 phr calcium carbonate pushed the system into dilatancy that manifested as pump cavitation.

The emulsion is manufactured under ISO 9001:2015 certified quality management and conforms to the compositional requirements of FDA 21 CFR 175.105 for indirect food-contact adhesives and German BfR Recommendation XIV for polymer dispersions when used within specified migration limits. It is listed in the ECHA Article 95 list of active substances and suppliers as compliant with the Biocidal Products Regulation (EU 528/2012) only where in-can preservatives are added by the formulator. The emulsion does not contain dibutyltin or dioctyltin catalysts, aligning with EN 71-3:2019 migration limits for toy safety. Published long-term exterior exposure data for CW40-937-specific formulations under ISO 2810 natural weathering is limited; however, accelerated QUV-B testing (ASTM G154-16, cycle 1) on 30% PVC pigmented films showed 90% retention of initial elongation after 1 000 h, provided an adequate UV absorber package is employed.

HS Code	677794
Appearance	white to off-white aqueous dispersion
Polymer Type	vinyl acetate-ethylene (VAE) copolymer
Solids Content	60.0 ± 1.0%
Viscosity	3000 - 7000 mPa·s (Brookfield, 100 rpm, 23°C)
Ph	4.0 - 5.5
Density	1.07 g/cm³ at 20°C
Particle Size	0.3 - 1.0 µm
Glass Transition Temperature	approximately -5°C
Minimum Film Forming Temperature	about 0°C
Film Appearance	clear, flexible film
Residual Monomer	< 0.1% vinyl acetate
Storage Shelf Life	12 months when stored below 30°C and protected from freezing

Packing	Supplied in 200 kg sealed drums, clearly labeled with safety data and handling instructions for high-performance VAE emulsion applications.
Container Loading (20′ FCL)	Container Loading (20′ FCL): CW40-937 high-solids VAE emulsion shipped as a full 20-foot container, in drums on pallets, ensuring safe, efficient transport.
Shipping	Ship CW40-937 High-Solids VAE Emulsion in sealed, moisture-resistant containers (drums, totes, or bulk tankers) to prevent contamination and drying. Protect from freezing and extreme heat; ideal storage 40–90°F. Ensure secure loading, proper labeling, and compliance with all transport regulations. Avoid prolonged exposure to air.
Storage	Store CW40-937 in its original, tightly sealed container in a cool, dry, well-ventilated area, away from direct sunlight and heat sources. Maintain temperatures between 5°C and 35°C; do not allow freezing. Keep containers upright to prevent leakage. Use within shelf life, and thoroughly mix before use.
Shelf Life	Store in original containers at 5–35°C, protected from freezing. Shelf life is 12 months from date of manufacture.

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CW40-937 High-Solids VAE Emulsion for High-Performance Applications

Why Does High Machine Speed Laminating on Polyethylene-Coated Kraft Require VAE with Elevated Solids?

High Solids Elastomeric Facade Coatings and the Role of Coalescent-Free Film Formation at 5 °C

Get Free Quote of Anhui Liwei Chemical Co., Limited.

What Defines the Physical Profile of CW40-937?

Where Does CW40-937 Outperform Standard Ethylene-Vinyl Acetate Dispersions?

Film Formation Below 0°C Without Coalescents

When Automotive Interior Laminates Demand Fast Set and Low Odor

Compatibility with Fillers and Rheology Modifiers

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