| HS Code | 704854 |
| Product Name | Alkali-Resistant VeoVa-PVAc Copolymer |
| Chemical Family | Vinyl acetate and vinyl ester of versatile acid (VeoVa) copolymer |
| Appearance | Milky white liquid |
| Solid Content | 50-55% |
| Viscosity | 2000-5000 mPa·s at 25°C |
| Ph | 4.0-6.0 |
| Glass Transition Temperature | 5-15°C |
| Minimum Film Forming Temperature | 0-10°C |
| Average Particle Size | 0.2-1.0 μm |
| Density | 1.05-1.15 g/cm³ |
| Alkali Resistance | Excellent resistance to alkaline environments such as cementitious substrates |
| Water Resistance | Good water resistance after film formation |
| Film Flexibility | Flexible and tough film at low temperatures |
| Adhesion | Strong adhesion to mineral and porous surfaces |
| Storage Stability | Stable for 6 months when stored at 5-35°C |
As an accredited Alkali-Resistant VeoVa-PVAc Copolymer factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Alkali-Resistant VeoVa-PVAc Copolymer is packaged in 200 kg lined steel drums, ensuring stability, safe handling, and easy storage. |
| Container Loading (20′ FCL) | 20′ FCL container loading: packaged in 25 kg bags on pallets, shrink-wrapped, ventilated, moisture-proof, stable stacking for safe transport. |
| Shipping | Ship Alkali-Resistant VeoVa-PVAc Copolymer in sealed drums, IBC totes, or bulk tankers. Protect from freezing and excessive heat; ideal storage is 5–35°C. Ensure secure, upright loading to prevent container damage or leakage. Avoid contact with incompatible materials and keep dry during transit. |
| Storage | Store in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and incompatible materials. Keep containers tightly closed to prevent moisture ingress and contamination. Avoid freezing or excessive temperatures. Ensure proper labelling and secondary containment. Follow manufacturer’s shelf-life guidelines and use within recommended period to maintain product stability and performance. |
| Shelf Life | Store in original sealed container, below 25°C, away from moisture. Shelf life is typically 12 months from production date. |
In exterior masonry coatings formulated at pigment volume concentrations between 35% and 50%, the alkali-resistant VeoVa-PVAc copolymer is let down after pigment dispersion into an aqueous binder system whose solids content is controlled to 50–53% by ISO 3251, pH to 4.0–5.5 by ISO 976, and minimum film-forming temperature to 0–5°C by ISO 2115. Pigment and extender slurry is ground on a high-shear dissolver fitted with a 450 mm Cowles blade at tip speed 8–12 m/s; the copolymer is post-added below 35°C to prevent thermal coagulation, then thickened to Stormer viscosity 95–105 KU under ASTM D562. The dry film resists saponification during continuous condensation exposure on fresh render at surface pH 12.0–12.5, with adhesion retention after 2,000 h saturated calcium hydroxide immersion tested by ISO 2812-1:2017 and cross-cut classified by EN ISO 2409. Water vapour transmission measured by ISO 7783-2 remains above 150 g/m²·d at 200 µm dry film thickness for a formulation PVC of 45%. Addition below 12 wt% polymer solids on total formulation produces insufficient film coalescence over highly porous cementitious substrates, while addition above 18 wt% tends to depress scrub resistance measured by ISO 11998. Field data from airless spray lines show that a viscosity increase exceeding 15 KU during 8 h circulation at 40°C causes block-free recoating intervals to extend beyond 4 h, so slow-stir hold tanks operating at 10–15 rpm are specified.
C2 tile adhesive formulations governed by EN 12004:2007+A1:2012, Table 1, accept the alkali-resistant VeoVa-PVAc copolymer as redispersible polymer powder at 2.5–4.5 wt% dry polymer on total dry mix; the powder is dry-blended with white or grey Portland cement CEM I 42.5 R, silica sand, and cellulose ether for 10 min in a horizontal paddle blender before addition. Water demand is adjusted to 0.22–0.26 L/kg, and mixing is performed with a slow-speed drill mixer at 300–500 rpm for 60–90 s, followed by a 5 min rest and 15–30 s remix to allow cellulose ether hydration without over-shearing the polymer film precursors. The powder must be stored below 50% RH; if exposed to RH > 60%, pre-drying at 40°C for 4 h is required to prevent lump formation and uneven polymer distribution. The critical processing window is at 4.0–4.5 wt% polymer loading: initial tensile adhesion according to EN 12004:2007+A1:2012, Table 1, remains above 1.0 N/mm² for C2 classification, but increasing the dosage above 6.0 wt% introduces air entrapment that lowers wet density to below 1,750 kg/m³ and delays early-strength development by 8–12 h because coalesced polymer films block water transport to unhydrated cement grains. Batch-to-batch variation in high-alkali clinker above 0.80% sodium oxide equivalent is a known field failure mode: the resulting pore solution pH above 13.2 can destabilize non-VeoVa PVAc binders, but VeoVa hindered ester side chains reduce saponification rate by an order of magnitude under the same conditions. When thin-bed application is made with a 6×6 mm notched trowel on a substrate heated to 35°C, open time drops from 30 min to less than 20 min, and field-corrected water addition above 0.26 L/kg causes slump and a loss of notched-bed stability. The use of the copolymer below 2.5 wt% is insufficient for water-immersion adhesion because the polymer film remains discontinuous after 7 days standard water storage, while above 5.0 wt% the cost-to-performance ratio is unfavourable for C2 products where deformation class S1 is not required. These limits are specific to VeoVa-VAc chemistry and its interaction with cement hydration kinetics at early ages.
When the aqueous dispersion is substituted for styrene-acrylic in an ETICS basecoat at 3.0–5.0% polymer solids on cement, the wet mortar is applied over expanded polystyrene insulation board in a 3–5 mm bed using a stainless steel trowel, and a 160 g/m², 4×4 mm alkali-resistant glass fibre mesh is immediately embedded. The polymer-modified mortar is evaluated according to EAD 040083-00-0404 for bond strength to insulation board and for impact resistance; laboratory samples prepared with 4.0 wt% polymer solids on cement show no mesh popping when the wet density is kept between 1,650 kg/m³ and 1,850 kg/m³. A high-shear planetary mixer operating at 250–400 rpm for 90–120 s prevents lumping of redispersible powder, but mixing beyond 180 s entrains air and reduces fresh mortar density below the lower limit, leading to insufficient mesh embedment and reduced tensile adhesion after 14 days standard climate storage at 23°C and 50% RH. The alkali-resistant character is necessary because the basecoat remains in contact with alkaline cement hydration water for at least 48 h under plastic film curing; a non-resistant PVAc dispersion at identical loading would lose film integrity and produce adhesion values below 0.08 N/mm² to EPS. Water vapour permeability remains acceptable at 15–20 g/m²·d per mm thickness when measured by ISO 7783-2, which allows dried basecoat to transmit construction moisture without blistering beneath a silicone topcoat. Operational boundaries for this copolymer in ETICS basecoat are substrate temperature from 5°C to 30°C and relative humidity below 80%; film formation is retarded below 5°C, and skinning at the surface above 30°C causes roller pickup during mesh embedding.
Cementitious waterproofing slurries are proportioned at a polymer-to-cement ratio of 0.45–0.55 by mass in two-component systems, or at 5.0–8.0% redispersible polymer powder on dry mix for one-component products, and are applied in two coats at 1.5–2.0 kg/m² per coat with a stiff masonry brush or steel trowel. The mixed slurry is dispersed with a low-shear spiral paddle mixer at 500 rpm for 2 min, and pot life remains 45–60 min at 20°C; adding extra water beyond 0.32 L/kg initiates segregation of polymer and cement, visible as a sticky film on the surface while the underlying layer remains friable. The cured membrane is tested according to EN 14891:2017 for crack-bridging capacity under standard conditions, and for water impermeability with a 250 mm hydrostatic column as reported in published third-party data. The alkali resistance of VeoVa-PVAc permits continuous contact with lime-saturated water at pH 12.5–13.0 without detectable saponification after 56 days immersion; this is verified by comparing tensile adhesion retention before and after immersion using ISO 4624. When the counter-pressure exceeds 1.5 bar on negative-side concrete, published data for this specific configuration is limited, and a project-specific test under DIN 1048-5 is required because hydraulic water pressure at higher levels can bypass polymer films through pinholes and cold joints. Application below 5°C substrate temperature or above 85% RH during the first 24 h retards coalescence and produces a soft film that can be washed out by hydrostatic seepage before cement hydration reaches final set. This copolymer is not recommended for continuous immersion in acidic groundwater below pH 5.5 or for flexible membrane systems requiring elongation above 30% under ASTM D412, because its lower elongation capacity when compared with acrylate copolymers imposes a structural movement boundary.
Published data for self-leveling underlayment applications of this specific VeoVa-PVAc copolymer is limited to flow-property modification at 1.0–2.0 wt% dry polymer on total mix, with no performance advantage over standard VAc/ethylene binders verified under EN 13813.
Elastomeric wall coatings containing 25–35% PVC and 20–28 wt% VeoVa-PVAc polymer solids on total formulation are applied by high-pressure airless spray at 180–220 bar with a reversible tungsten carbide tip of 0.021–0.027 in bore, producing a wet film build of 200–400 µm per pass over primed concrete. The copolymer MFFT near 0°C allows coalescence down to 5°C substrate temperature without volatile coalescent exceeding 2.5 wt% on total liquid paint, which maintains compliance with Directive 2004/42/EC for subcategory A/a/VOC limits. Tensile elongation of films prepared at 250 µm dry thickness is measured by ASTM D412; typical values between 120% and 250% elongation at break are achievable only when the wet film is protected from rain and condensation for the first 24 h. Viscosity for spray application is stabilized between 110 KU and 120 KU by ASTM D562; lower viscosity yields orange peel and higher viscosity causes tailing at the spray fan edges, requiring tip pressure adjustment beyond 220 bar and increasing hose temperature above 45°C. On a spray line equipped with a 30:1 Graco King pump and 3/8 in by 15 m high-pressure hose, pressure drop under continuous circulation is 10–15 bar, and the hose must be flushed with water within 2 h of shutdown to prevent polymer deposition on the tungsten carbide seat. The dried film maintains adhesion to alkaline concrete surfaces above 1.0 N/mm² when tested by ISO 4624 after 14 days cure, but should not be applied over bituminous substrates because plasticizer migration displaces the coalesced film and causes peeling within 6 months.
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Alkali-resistant VeoVa-PVAc copolymer is an aqueous emulsion copolymer of vinyl acetate and a vinyl ester of a branched tertiary carboxylic acid, designated VeoVa9, VeoVa10, or VeoVa11 according to the carbon number of the versatic acid segment. The product is supplied as a milky white liquid dispersion stabilized by an anionic or nonionic surfactant system. Commercial model designations usually encode the VeoVa monomer type and its mass fraction on total monomer; a representative grade contains 20 wt% VeoVa10 and 80 wt% vinyl acetate. The primary structural difference from unmodified poly(vinyl acetate) is the sterically hindered tertiary carbon adjacent to the ester linkage. This branched architecture retards hydroxide-ion attack at the acetate carbonyl and limits the chain-breaking saponification that embrittles PVAc films on fresh mineral substrates.
Cementitious substrates release a pore solution with pH 12.5–13.5 during hydration because of calcium hydroxide saturation. Under these conditions, poly(vinyl acetate) homopolymer films undergo base-catalyzed ester hydrolysis; acetate side groups are converted to poly(vinyl alcohol) and sodium acetate, increasing film hydrophilicity, reducing tensile strength, and causing adhesion loss at the mortar-paint interface. The VeoVa-PVAc copolymer suppresses this pathway through steric shielding. The versatate ester contains a tertiary carbon directly attached to the ester oxygen; the branched alkyl cage imposes a higher activation barrier for nucleophilic attack by hydroxide ion. The steric effect also reduces equilibrium swelling of the film in alkaline water, thereby lowering the local concentration of hydroxide at the ester linkage. The hydrolysis follows pseudo-first-order kinetics when hydroxide concentration is maintained constant. Commercial technical literature reports that a VeoVa10/PVAc film containing 20–25 wt% VeoVa10 loses less than 2% of its original mass after 24 h immersion in 5% sodium hydroxide solution at 23 °C, whereas an unmodified PVAc control often exceeds 8% under the same ISO 2812-1 exposure. The residual ester protection is not absolute; prolonged immersion in 10% caustic at temperatures above 40 °C still hydrolyzes the polymer, so the product is rated for alkaline building substrates rather than chemical-process service.
Typical specification windows for commercial VeoVa-PVAc dispersions are controlled by monomer feed ratio, particle morphology, and stabilizer chemistry. The following table compiles representative ranges from multiple supplier technical data sheets; exact values must be confirmed against the certificate of analysis for the selected grade because stabilizer type and particle size distribution shift final film properties. VeoVa9/PVAc grades have higher MFFT and higher film hardness; VeoVa11/PVAc grades provide lower MFFT and improved flexibility. The selection among models depends on application temperature and crack-bridging requirement.
| Parameter | Unmodified PVAc homopolymer | VeoVa10/PVAc (20–25 wt% VeoVa10) | Test method |
|---|---|---|---|
| Non-volatile content | 50–55 wt% | 50–55 wt% | ISO 3251 |
| pH | 4.0–6.0 | 4.5–6.5 | ISO 976 |
| Brookfield viscosity at 25 °C | 500–3000 mPa·s | 500–3000 mPa·s | ISO 2555 |
| Minimum film-forming temperature | 5–18 °C | 0–8 °C | ISO 2115 |
| Mean particle size | 0.1–0.3 µm | 0.1–0.3 µm | ISO 22412 |
| Alkali resistance: mass loss after 24 h in 5% NaOH | 5–12% | 0.5–2.0% | ISO 2812-1 |
| Water absorption after 24 h | 20–35% | 8–15% | ISO 62 |
| Tensile strength | 8–15 MPa | 4–8 MPa | ISO 37 |
The product is used in cementitious primers, polymer-modified tile adhesives, flexible cementitious waterproofing slurries, and mineral facade paints. In cementitious two-component systems, the dispersion is introduced into the liquid phase at a polymer-cement ratio of 0.05–0.15 by mass; higher ratios increase flexibility but reduce compressive strength and extend setting time. For pigmented coatings, the binder is typically formulated at a pigment volume concentration of 25–40% to balance wet scrub resistance and alkali permeability. Addition of ammonia or 2-amino-2-methyl-1-propanol raises formulation pH to 8.5–9.5; direct addition of concentrated sodium hydroxide above pH 10 can coagulate the dispersion through surfactant desorption and should be avoided.
VeoVa10/PVAc copolymer dispersions typically exhibit a minimum film-forming temperature between 0 °C and 8 °C when the VeoVa10 fraction is 20–25 wt%. This MFFT is sufficiently low for interior application without coalescent, but exterior application at substrate temperatures below 10 °C requires 2–5 wt% of a high-boiling coalescent based on binder solids to maintain particle deformation and interdiffusion. The coalescent must have a Hansen solubility parameter compatible with both the hydrophobic versatate domains and the residual acetate domains; butyl carbitol and propylene glycol phenyl ether are used in practical formulations. Insufficient coalescence creates microcracks and increases alkali permeability, negating the steric barrier to saponification. The free-volume increase from coalescent is temporary; residual solvent leaves the film within 7–14 days under normal ventilation. Early wet scrub resistance may therefore be depressed until coalescent evaporation is complete. In production, pigment dispersion is typically carried out with a high-shear disperser fitted with a Cowles blade at tip speed 18–25 m/s, while letdown mixing uses a low-shear anchor or paddle at 50–100 rpm. High-shear circulation pumps and long transfer lines can generate shear-induced coagulation because the emulsion is stabilized by surfactant adsorption rather than covalent crosslinks; filtration through 100–150 µm mesh is standard after letdown.
Freeze-thaw stability per ASTM D2243 is generally three cycles without visible gel for properly formulated coatings, but the dispersion itself may sediment after repeated freezing. Thawing under low shear and rechecking viscosity is required before use.
VeoVa-PVAc copolymers are selected for alkaline adhesion and low water sensitivity, not for long-term high-gloss exterior durability. The residual vinyl acetate segments are more prone to photo-oxidative chain scission than pure acrylic or styrene-acrylic binders. Exterior topcoat formulations based on VeoVa-PVAc therefore require a PVC below 35% and the addition of hindered amine light stabilizers and triazine or benzotriazole UV absorbers. Accelerated weathering per ASTM D6695 or ASTM G154 should be used to validate gloss retention; published data for specific VeoVa-PVAc topcoat configurations are limited, so direct comparison with acrylic controls on the same substrate is necessary. For exterior masonry paints, wet scrub resistance is measured by ISO 11998, and water-vapour transmission rate by ISO 7783-2. These standards are relevant because alkali-resistant primers must also allow moisture vapour egress from the substrate to avoid blistering. The product is better positioned as an alkali-resistant primer or basecoat under a UV-durable topcoat, where its adhesion to concrete and compatibility with cementitious fillers provide the principal benefit.
Compared with styrene-acrylic dispersions, VeoVa-PVAc offers lower raw-material cost and better wetting of mineral fillers, as indicated by lower dispersant demand in high-speed mixing; however, exterior gloss retention and tensile strength are lower. Compared with unmodified PVAc, the VeoVa-containing copolymer reduces water uptake by roughly 50–60% and reduces alkali-induced mass loss by more than half in standard 5% NaOH tests under ISO 2812-1. Compared with pure acrylic binders at equivalent PVC, VeoVa-PVAc can provide stronger adhesion to damp cementitious surfaces but should not be used where long-term UV exposure is the governing requirement.
In two-component cementitious waterproofing slurries, the dispersion is combined with a powder mixture of ordinary Portland cement, silica sand, and superplasticizer. The polymer-cement ratio is adjusted to 0.10–0.15; at this level the cured membrane retains flexibility at 2 mm thickness and bridges static cracks up to 0.2 mm, but dynamic crack-bridging performance decreases when the ratio exceeds 0.20 because of excessive polymer-rich phase and reduced compressive strength. Film toughness at low thickness can be checked by measuring elongation at break per ISO 527-3 after curing 28 days at 23 °C and 50% relative humidity. Mixing employs a slow-speed paddle mixer at 300–500 rpm to avoid air entrainment; pot life under 23 °C and 50% relative humidity is typically 45–60 min.
For tile adhesive modification, the dispersion is evaluated against ISO 13007-1 classification requirements; a polymer-cement ratio of 0.05–0.10 typically improves tensile adhesion strength after water immersion and heat ageing. The latex must be added to the mixing water before cement to prevent high-shear coagulation in dry-mix equipment.
Storage stability is generally 6–12 months in sealed containers at 5–35 °C. The dispersion should not be formulated with cationic additives or multivalent salts above 10 mmol/L because charge destabilization leads to grit formation. Before use, the dispersion must be conditioned to 15–25 °C and gently stirred with a low-shear mixer to eliminate sedimentation without introducing air. Compatibility with cellulosic thickeners should be checked by measuring Stormer viscosity per ASTM D562 after 24 h; some hydrophobically modified alkali-swellable emulsions cause viscosity drift due to competitive surfactant adsorption.
