| HS Code | 942926 |
| Product Name | Vinavil 2155LB |
| Chemical Family | Vinyl acetate homopolymer |
| Physical Form | Aqueous dispersion |
| Appearance | White liquid |
| Solids Content | 55% ± 1 |
| Viscosity | 1800–2500 mPa·s at 20°C |
| Ph | 4.5–5.5 |
| Density | Approximately 1.06 g/cm³ at 20°C |
| Minimum Film Forming Temperature | Approximately 10°C |
| Residual Monomer Content | Less than 0.1% |
As an accredited Vinavil 2155LB factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Vinavil 2155LB is supplied as a liquid in 200 kg net plastic-lined steel drums, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL loading: palletized, shrink-wrapped bags of Vinavil 2155LB, evenly stacked, secured, dry and ventilated container. |
| Shipping | Vinavil 2155LB is an aqueous vinyl acetate-ethylene copolymer dispersion. Ship in sealed containers, protected from freezing and extreme heat. Not classified as dangerous goods under ADR/IMDG, but prevent spills. Keep upright, ventilated, and avoid contact with eyes and skin. Include proper documentation and handling instructions. |
| Storage | Store Vinavil 2155LB in its original, tightly closed container in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and incompatible materials. Maintain temperatures between 5°C and 30°C; do not allow to freeze. Keep out of reach of unauthorized personnel and ensure proper labeling and spill containment measures are in place. |
| Shelf Life | Shelf life is typically 12 months from production when stored in sealed original containers at 5–35°C. |
In flat-panel wood lamination, Vinavil 2155LB is metered as a single-component assembly adhesive after the dispersion has been conditioned to 15–25°C and filtered through a 150 µm nylon mesh to remove dried skins. A starting formulation for edge-glued softwood panels comprises 100 parts by weight dispersion, 5–12 parts by weight finely divided calcium carbonate filler, and 0.2–0.5 parts by weight defoamer; the filler is incorporated in a planetary mixer with wall scraper at 30 rpm for 15 min until the lump count on a Hegman gauge drops below 50 µm. Spread rate is controlled at 120–180 g/m² single-face using a rubber-roller coater with a stainless-steel doctor roll, while wood moisture content is maintained at 8–12% to prevent steam blisters during pressing. The cold press applies 0.3–0.7 N/mm² for 20–60 min at ambient temperature, after which panels are conditioned for at least 24 h before sanding or cross-cutting. Tensile shear strength on beech is evaluated according to DIN EN 205 and classified under EN 204 D2 for interior furniture joints and door cores. Because the homopolymer matrix lacks structural water resistance, third-party wet-use classification to EN 204 D3 requires addition of an aliphatic polyisocyanate hardener at 3–8% on dispersion mass immediately before application; pot life at 20°C is typically 45–60 min. Production lines that delay pressing beyond the open assembly time of 5–15 min at 60% RH produce low-fibre-tear bonds and should be revalidated when relative humidity exceeds 70%. Published comparative data for Vinavil 2155LB with specific polyisocyanate hardener grades is limited, so production validation should include a design-of-experiments covering hardener dosage, beech substrate lot, and press residence time. Application below 5°C or onto substrates with moisture content above 12% falls outside the operational window and produces starved bonds or surface skid under load.
On multi-ply spiral tube winders operating at 40–100 m/min, Vinavil 2155LB is transferred from bulk to the applicator through a positive-displacement gear pump with back-pressure held at 2–4 bar; the dispersion is applied to paperboard plies through an engraved roll and smoothed by a doctor blade before the forming belt consolidates the outer ply. The as-received viscosity of 5,000–10,000 mPa·s at 20°C is reduced to a coating viscosity of 2,500–3,500 mPa·s by adding 0–8 parts water per 100 parts dispersion; dilution beyond 10 parts water causes skip zones on high-gloss clay-coated paperboard because the wet adhesive film collapses under the forming belt before fibre entanglement occurs. Adhesive consumption is held between 15–25 g/m² dry solids, and finished cores are tested for flat crush resistance under ISO 11093-4; ply adhesion is accepted only when manual separation yields fibre tear from the board surface. For indirect food-contact uses such as film cores and paper canisters, the adhesive must satisfy FDA 21 CFR 175.105 and, where a functional barrier is absent, the framework requirements of Regulation (EC) No 1935/2004. Terminal products include spiral-wound cores for flexible packaging, composite canisters for dry powders, and corner posts for protective packaging. Processing incompatibilities include high-shear pumping loops without back-pressure control, which generate foam and reduce wet tack, and contact with zinc stearate release agents on paperboard, which lowers ply bond retention. Batch-to-batch variation in clay-coated board surface energy requires daily verification of wet-out using dyne pens in the range 36–42 mN/m.
For air-laid nonwoven webs used in mattress ticking and furniture dust covers, Vinavil 2155LB is applied as a foamed binder at 8–15% binder solids on fibre mass. Foam generation uses a rotor-stator foamer operating at 1,500–2,000 rpm with a foam density target of 150–250 g/L; the foam collapses under a vacuum slot to distribute the polymer at fibre intersections before through-air drying. Dryer temperature is set at 130–150°C for 10–30 s, because higher temperatures form a surface skin that blocks moisture escape and drives unbound polymer to the web surface, a defect visible as surface streaks under raking light. Tensile strength is measured according to EDANA/INDA WSP 100.1; wet tensile retention requires the addition of a glyoxal-based crosslinker at 0.5–1.0% on dispersion solids, which reduces pot life to 4–8 h at 20°C. The resulting nonwoven is used for dry interior applications; it is not acceptable for reusable hygiene articles or automotive headliners exposed to temperatures above 80°C or sustained alkaline moisture. On production-scale lines, binder add-on is verified by ashing at 525°C or by near-infrared reflectance calibrated against the wet-pickup gravimetric method.
| Downstream line | Critical control parameter | Reported operating window | Reference method |
|---|---|---|---|
| Wood edge gluing | Beech moisture content | 8–12% | DIN EN 205 |
| Paper tube winding | Coating viscosity after dilution | 2,500–3,500 mPa·s | Brookfield RVT, spindle 5, 20 rpm, 20°C |
| Air-laid nonwoven | Through-air dryer temperature | 130–150°C | EDANA/INDA WSP 100.1 |
| Gypsum joint compound | Active polymer addition | 2–5% | ASTM C474/C474M |
| Coated abrasive make coat | Festoon dryer temperature | 90–120°C | ISO 6344-1 |
In ready-mixed gypsum jointing compounds, Vinavil 2155LB is introduced as a latex modifier at 2–5% active polymer solids on total compound mass to improve trowel slip, edge feathering, and paper-liner adhesion. The dispersion is added after the thickening system has been hydrated in a horizontal ploughshare mixer with jacketed trough at 25–35°C; addition directly onto dry gypsum powder causes local coagulation and lumping that cannot be fully redispersed. Joint compounds formulated with this additive are tested for bond to paper-faced gypsum board under ASTM C474/C474M and, for the European market, factory production control is documented against EN 13963. The low water resistance of the polymer limits use to interior drywall finishing; the compound will soften and lose cohesive strength under sustained moisture or exterior weathering. Production batches that exceed 5% active polymer display longer drying times and increased shrinkage cracking when applied over butt joints without adequate drying between coats.
On coated abrasive lines, Vinavil 2155LB is compounded into the make coat that anchors electrostatically deposited aluminium oxide grit to flexible paper backing. The make coat is applied by reverse-roll coater at 50–80 g/m² wet, followed by electrostatic deposition of P320–P800 grit according to ISO 6344-1, and then a size coat at 60–100 g/m² wet. Festoon drying is carried out at 90–120°C with recirculated air; too rapid initial drying causes the surface to skin over and prevents water release from the make coat, leading to grit shedding during flex testing. Finished sheets are tested for grain anchorage and flex resistance, but published comparative data for Vinavil 2155LB in this specific configuration is limited; therefore, a pilot trial on a narrow-web coater is recommended before full-scale conversion. The products are dry-use wood sanding sheets and rolls, not waterproof or high-pressure grinding belts. Addition of hydrophobic wax emulsions above 2% on dispersion solids improves water resistance but reduces wet make-coat tack and can shift electrostatic deposition efficiency.
On perfect-binding lines producing softcover brochures, Vinavil 2155LB is applied by a cold-emulsion nozzle after the spine is roughened to a depth of 0.5–1.5 mm. Wet film weight is 200–400 g/m²; cover crimping pressure is 0.1–0.3 N/mm²; stacking after 20–40 s ambient drying prevents blocking. Page-pull and cold-open flexibility are tested by production protocol under a tensile tester at 100 mm/min crosshead speed, and accelerated ageing is assessed according to ISO 5630-3. The acidic pH of the homopolymer dispersion limits its use in archival library binding where a neutral or alkaline papermaking process is specified; for commercial short-life softcover products this limitation is acceptable. When the adhesive is run on lines originally configured for hot-melt, residual heat at the clamping station above 40°C can produce premature film skinning and must be removed by air knives before contact with the adhesive film.
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Vinavil 2155LB is an aqueous vinyl acetate-ethylene copolymer dispersion supplied by Vinavil S.p.A. It is delivered as an anionic-surfactant-stabilised liquid with a nominal solids content of 55.0 ± 1.0 % by mass when tested according to ISO 3251. The Brookfield RVT viscosity at 25 °C is published in the range 2,500–4,500 mPa·s, measured at 20 rpm with spindle 4. The dispersion pH is 4.0–6.0 under ISO 976, density is approximately 1.07 g/cm³ under ISO 2811, and the minimum film-forming temperature is ≤ 0 °C under ISO 2115. The ethylene comonomer provides internal plasticization; consequently, the product can be formulated without external dibutyl phthalate, triacetin, or benzoate plasticizers. The anionic surfactant stabilisation produces shear-thinning behaviour. Under high-shear roll-coater conditions, apparent viscosity decreases to facilitate transfer and wet-out, while low-shear viscosity remains sufficient to control penetration into paper, board, and wood. Manufacturer-recommended storage is 6 months at 5–30 °C in sealed containers. Freeze-thaw cycling is not recommended because ice formation can induce irreversible coagulation and filter-blocking grit.
Standard polyvinyl acetate homopolymer dispersions with glass transition temperatures near 28–33 °C often require external plasticizers to reduce film formation temperature. Those plasticizers can migrate over time, embrittle the bond line, and lower adhesion to coated paperboard and dense hardwood. Vinavil 2155LB belongs to the internally plasticized VAE class, where ethylene units lower the minimum film-forming temperature to ≤ 0 °C without requiring migrant plasticizers. In wood adhesive compounds, this difference supports shorter open times, improved fibre-tearing bonds on beech and oak, and lower extractables after film formation. Under EN 204:2016, unmodified VAE wood adhesives of this class are generally classified as D2 for interior use with limited water exposure. D3 wet-strength requires a hardener—commonly an isocyanate, aluminium chloride, or chromium-free crosslinker system—added at 2–5 wt% based on dispersion solids. Without such hardeners, 24 h water immersion at 23 °C typically reduces shear strength below the 2 N/mm² threshold associated with D3 classification. This limitation is operationally significant when a converter replaces a two-pack PVAc with the same cleanup procedures: uncured 2155LB is water-washable, but activated mixes have limited pot life.
On nozzle and roller production lines, the dispersion is commonly compounded with 10–30 wt% calcium carbonate, 2–5 wt% polyvinyl alcohol solution, and 0.1–0.3 wt% defoamer to adjust rheology and wet tack. A single-sided coating weight of 120–180 g/m² on a nip-roller coater running at 15–30 m/min provides sufficient wet tack for hardwoods; cold pressing at 0.5–1.0 N/mm² for 4–12 min at 20 °C is typical for panel formats up to 600 mm × 600 mm. Higher filler loadings above 30 wt% reduce wet tack and shorten open time below 5 min at 23 °C and 50 % RH. When ambient relative humidity falls below 40 %, water loss accelerates and open time can drop to 3–4 min, causing skip bonds on large lay-up tables. Mixing is conventionally performed in stainless-steel dissolvers with Cowles blades at 100–300 rpm for filler addition and 50–100 rpm after hardener addition to limit air entrainment.
Hardwood assemblies, particularly beech and maple, present a dual constraint: higher filler loading reduces cost but also reduces wetting of dense machined surfaces, while longer press times raise manufacturing cost. Vinavil 2155LB’s ethylene content moderates surface tension and improves wet-out compared with homopolymer PVAc of equivalent solids, but the effect is not unlimited. In a typical D3 formulation at 25 wt% calcium carbonate, 3 wt% polyvinyl alcohol, and 3 wt% isocyanate hardener, Brookfield viscosity at 20 rpm rises to 10,000–20,000 mPa·s. Open time at 23 °C and 50 % RH is 8–10 min; at 35 °C or 30 % RH, open time falls below 4 min. Press loading must therefore be sequenced so that adhesive is applied to no more than 8–10 boards per operator before clamping. Published shear values for VAE/D3 compounds of this class after 7 days conditioning generally fall in the range 8–12 N/mm² dry and 2–4 N/mm² after 24 h cold water immersion when tested according to EN 205. An unmodified D2 formulation retains 6–8 N/mm² dry but falls below 1 N/mm² after immersion. The hardener window is narrow: below 2 wt% isocyanate, D3 wet-strength often does not reach the required 2 N/mm²; above 5 wt%, the adhesive becomes brittle and bond-line shrinkage increases. For open-pored woods, a first priming coat diluted with 5–10 % water improves anchorage without reducing final bond strength.
For interior furniture parts exposed to fluctuating humidity, bond lines formulated from 2155LB without D3 hardener are suitable for service class D2, which covers interior locations with occasional short-term water exposure from condensation. Cyclic humidity exposure between 30 % RH and 85 % RH at 23 °C has less severe effects than liquid water immersion, but it can reveal formulation deficiencies such as hardener migration or polyvinyl alcohol phase separation. For high-humidity interior joinery, the use of a D3 hardener at 3–5 wt% is specified; below 3 wt%, the polymer network density is insufficient to resist plasticization by absorbed water. This is a threshold risk because water plasticization lowers the glass transition temperature and permits creep under load. The addition of hydrophobic fumed silica at 0.5–1.5 wt% can improve slump resistance without eliminating the need for crosslinking.
In packaging lamination, Vinavil 2155LB is used in aqueous adhesives for paper-to-paper, paper-to-board, and paper-to-PET film constructions. Typical formulation includes 5–15 wt% plasticizer-free VAE plus 5–10 wt% polyvinyl alcohol, with viscosity adjusted to 600–1,200 mPa·s for air-knife and roller coaters. In flat-bed lamination at 80–120 m/min, a dry coat weight of 6–12 g/m² is typical for paper-to-paper bonding. Because the polymer is soft and contains no phthalate plasticizers, migration into dry foodstuffs is minimized. Indirect food-contact suitability is generally established under FDA 21 CFR 175.105 and Commission Regulation (EU) 10/2011, provided the final adhesive is applied as a non-detectable or functionally separated layer. Converters must verify overall migration below 10 mg/dm² in the final laminate. High-speed case-converting lines require rapid wet grab; on pre-printed clay-coated board, open time can be 2–3 min shorter than on uncoated kraft because the coating absorbs water differentially.
The dispersion is anionically stabilised. Coagulation is induced by cationic additives, polyvalent salts at concentrations above 0.5–1.0 wt%, and acidic coagulants. The pH must not be reduced below 3.0 during compounding. Blending with polyvinyl alcohol solutions above 15 wt% can raise viscosity unpredictably depending on the PVA hydrolysis degree and molecular weight. Hardener addition should follow filler and PVA dispersion, with continuous low-shear mixing at 100–300 rpm to avoid local pH inhomogeneity. Vinavil 2155LB is incompatible with amine-based catalysts that destabilise the anionic surfactant. Process vessels should be stainless steel, glass-lined, or high-density polyethylene; unlined carbon steel can promote discolouration and pH drift. Cold-warehouse application below 5 °C can cause practical film-formation defects even though the MFFT is ≤ 0 °C. When substrate and air temperatures fall below 5 °C, water evaporation slows and the wet film may remain water-thinned, freeze, or be washed away. In unheated storage bays, the adhesive should be pre-conditioned to 15–20 °C before roller application. Dried films exposed to freezing conditions within 24 h of lamination may show crazing. These limits are operational boundaries rather than product failures.
The choice of polyvinyl alcohol protective colloid influences both open time and water resistance. Fully hydrolysed PVA grades at 98–99 mol% hydrolysis increase high-shear viscosity and improve initial green strength but can increase water sensitivity. Partially hydrolysed PVA grades at 87–89 mol% hydrolysis provide better stabilisation in acidic conditions but may reduce D3 wet strength when used above 5 wt% on dispersion solids. For Vinavil 2155LB, formulators often select an 88 mol% PVA at 2–3 wt% as a rheology modifier and a fully hydrolysed grade at 1–2 wt% for rapid tack. This combination reduces settling without shifting pH outside the stable window. Actual ratios depend on the filler grade and hardener system; published data for this specific binary PVA combination with 2155LB is limited, and pilot-scale viscosity sweeps are recommended.
Calcium carbonate grade affects the rheology and setting behaviour of the compounded adhesive. Ground calcium carbonate with a median particle size of 2–5 µm produces lower low-shear viscosity than precipitated grades with median particle size below 1 µm. However, the finer precipitated grades provide better anti-settling and smoother bond lines. When 2155LB is compounded above 50 wt% total solids with filler, the high-shear viscosity in a slot-die coater can exceed 8,000 mPa·s; this makes roller coating less uniform unless the line speed is reduced below 20 m/min. The threshold is operationally important for furniture side-panel lamination. Formulators should measure viscosity at a shear rate representative of the coater, not only at Brookfield low shear.
| Property | Value | Test method |
|---|---|---|
| Solids content | 55.0 ± 1.0 % | ISO 3251 |
| Brookfield viscosity | 2,500–4,500 mPa·s | ISO 2555, 25 °C, 20 rpm, spindle 4 |
| pH | 4.0–6.0 | ISO 976 |
| Density | 1.07 g/cm³ | ISO 2811 |
| MFFT | ≤ 0 °C | ISO 2115 |
| Storage | 6 months at 5–30 °C | Manufacturer’s technical data sheet |
Incoming quality control should include a visual check for coarse grit, a pH measurement, and a Brookfield viscosity reading after 24 h temperature equilibration at 25 °C. Viscosity drift greater than ± 10 % from the certificate of analysis may indicate shear damage during transport or incipient freeze-thaw damage. Batches that have been exposed to temperatures below 2 °C during transit should be quarantined and evaluated with a 100 µm filter-screen test before use. The dispersion is not designed for pumping through long runs of small-bore unheated hose; low-flow positive-displacement pumps with a minimum internal clearance of 2 mm and stainless-steel rotors are preferred to avoid mechanical shear degradation.
For wood adhesive applications, classification is tested under EN 204:2016 and bond strength under EN 205. For packaging converters, indirect food-contact status is generally supported by FDA 21 CFR 175.105 for adhesives used in packaging with a functional barrier, and Commission Regulation (EU) 10/2011 for plastic materials and articles intended to come into contact with food. Overall migration must be below 10 mg/dm² in the final laminate for EU compliance. REACH registration under EC 1907/2006 requires the downstream user to confirm that no substance of very high concern is present above 0.1 wt% in the article. These statements do not replace a specific compliance declaration from the dispersion manufacturer; converting trials must include migration testing on the final construction because substrate, coat weight, and cure conditions affect the result.
| Application | Standard | Relevant requirement |
|---|---|---|
| Non-structural wood adhesive classification | EN 204:2016 | D2 without hardener; D3 with hardener |
| Wood bond tensile shear | EN 205 | D3 wet strength ≥ 2 N/mm² after 24 h immersion |
| Indirect food-contact adhesive | FDA 21 CFR 175.105 | Functional barrier or non-detectable transfer |
| Plastic food-contact materials | Commission Regulation (EU) 10/2011 | Overall migration ≤ 10 mg/dm² |
| Chemical regulation | EC 1907/2006 | No SVHC above 0.1 wt% in article |
Morphologically, the ethylene segments in VAE reduce hydrogen bonding between acetate groups and thereby lower the minimum film-forming temperature. They also introduce short-chain branching that influences shear storage modulus and set speed. In contrast, a polyvinyl acetate homopolymer of similar solids content has a higher tensile modulus but forms a brittle film at 10–15 °C unless an external plasticizer is present. The VAE architecture of 2155LB allows a lower film formation temperature while retaining a measurable shear storage modulus, which is relevant for creep resistance in D3 formulations. The absence of phthalate or benzoate plasticizers reduces long-term migration and contributes to lower odour, but it also means that formulators cannot adjust film softness simply by adding a low-molecular-weight plasticizer without perturbing the polymer network. This is a key operational difference: process adjustments are made through hardener selection, filler content, and PVA rheology modifier levels rather than plasticizer addition.
In edge-banding and profile-wrapping operations, the dispersion is occasionally used as a primer or as a component of a two-part system with a polyisocyanate hardener. Application by slot die or spray requires a lower working viscosity of 800–1,500 mPa·s; dilution with up to 5 wt% water is possible before shear stability decreases. Reactive mixes must be applied within their pot life, typically 4–8 h at 20 °C, and spray nozzles require flushing with water before the pot-life endpoint. Because the polymer is not thermosetting by itself, edge-band lines running above 60 °C can show thermoplastic softening unless the formulation includes a crosslinker. Published data for high-frequency edge-banding with 2155LB as the sole binder are limited; most production lines use it as a primer layer at 5–10 g/m² dry coat weight under a higher-viscosity PVAc or hot-melt main adhesive.
