| HS Code | 105565 |
| Productname | Covinax 324-00 |
| Polymertype | Vinyl acetate-ethylene copolymer dispersion |
| Appearance | White milky liquid |
| Solidscontent | 55% by weight |
| Viscosity | 6000 mPa·s at 25°C |
| Ph | 4.5 |
| Glasstransitiontemperature | 5°C |
| Minimumfilmformationtemperature | 1°C |
| Density | 1.1 g/cm³ |
| Shelflife | 12 months from date of production |
As an accredited Covinax 324-00 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Covinax 324-00 is supplied in 25 kg multi-wall paper bags with an inner polyethylene liner for protection. |
| Container Loading (20′ FCL) | Covinax 324-00 is loaded into a 20-foot FCL container, with drums palletized, secured, and braced for safe chemical transport. |
| Shipping | Covinax 324-00 is a synthetic ketone resin, typically in solid pastille form. It is not classified as dangerous goods under ADR, IMDG, or IATA. Ship in clean, dry multi-wall paper bags or fiber drums, protected from moisture and heat. Label as “Synthetic resin, non-hazardous cargo.” |
| Storage | Store Covinax 324-00 in tightly sealed original containers in a cool, dry, well-ventilated area. Keep away from direct sunlight, heat, sparks, open flames, strong oxidizers, and moisture. Maintain moderate, stable temperatures to prevent degradation or pressure buildup. Ensure secondary containment, clear labeling, and stock rotation. Always follow the manufacturer’s Safety Data Sheet and local regulations. |
| Shelf Life | Shelf life is 12 months from manufacture date when stored unopened in original container below 25°C. |
Before a paper face stock reaches the coating head, the working liquid is standardized to 1,500–2,500 mPa·s at 25 °C using a Brookfield RVT spindle 4 at 20 rpm. This viscosity window is selected to maintain a uniform film when the adhesive is transferred from an 80–100 line/cm gravure cylinder to 58 g/m² machine-finished paper without pump cavitation or reverse-flow starvation. Covinax 324-00 is employed as the principal binder without external tackification for paper label constructions where FDA 21 CFR 175.105 governs indirect food-contact adhesive components. A representative compounding ratio is 100 phr emulsion, 0.10–0.25 phr mineral-oil/silica defoamer, and sufficient alkali-swellable polyacrylate thickener to produce a Zahn #2 cup drain time of 30–45 s at 25 °C. The pH is adjusted to 7.0–7.5 with diluted ammonium hydroxide only when the selected rheology modifier requires neutralization. In production, the dispersion is deposited by reverse gravure at 40–50 µm wet film thickness and dried through a three-zone air flotation dryer with zone set points of 60 °C, 80 °C, and 95 °C. Residual moisture is held below 1.0 wt% by Karl Fischer titration, with preferable control below 0.5 wt% when line speed exceeds 120 m/min, because higher moisture at the dryer exit causes block temperature drift and liner curl after lamination. The dried adhesive mass is 20–25 g/m², and the web is cooled to 30 °C before lamination to a 55 µm differential-release glassine liner. The terminal products are flat-cut and guillotined cut-stack labels for bakery bags, beverage carrier wraps, and frozen food pouches where the adhesive layer remains separated from direct food contact. Edge bleed is controlled by the high cohesive strength of the dried film, and die-cutting is performed on rotary converters at speeds up to 100 labels/min without adhesive stringing when dry film weight is kept within the specified range.
On 30 µm corona-treated biaxially oriented polypropylene, dry adhesive mass is the primary lever controlling 180° peel on stainless steel under PSTC-101 after 24 h dwell. A reduction from 22 g/m² to 14 g/m² can shift the failure mode from cohesive near the adhesive-facestock interface to interfacial on low-surface-energy facestocks, and a clear no-label-look cosmetic label may fall below an 8 N/25 mm permanent label acceptance criterion if the film is not top-coated. For this segment, the formulation is diluted with deionized water to 45–48 wt% solids and coated by slot die at 100–150 m/min. Shear viscosity at 100 s⁻¹ is held at 150–250 mPa·s to prevent die-lip buildup and to maintain streak-free flow across a 1.3 m wide slot-die manifold. The liquid is filtered through 50 µm bag filters before the die, and pressure drop across the filter must not exceed 1.0 bar; higher differential pressure indicates microgel accumulation that can produce transfer voids. Label constructions for personal-care containers in the European Union are assessed under Regulation (EC) No 1223/2009 only for the finished cosmetic article, while the adhesive formulation is screened against REACH (EC) No 1907/2006 Annex XVII restrictions and RoHS Directive 2011/65/EU Annex II when the label is used on electrical or electronic cosmetic packaging. California Proposition 65 screening is applied to tackifiers and colorants but not to the base polymer when no listed substance is intentionally added. External tackifier addition should be limited to 5 phr or less because higher levels increase die-stringing and may lower static shear under PSTC-107 below 24 h on stainless steel. The terminal format is a roll-to-sheet clear pressure-sensitive label with a glassine liner die-cut at 0.5 mm cut depth, used on PET bottles and polyolefin tubes. The limiting operational window is low coat weight on untreated or low-dyne film; below 14 g/m², peel after 24 h becomes substrate-sensitive and should be revalidated on the specific packaging grade.
On a 1.6 m wide multi-roll transfer coating line running at 120–160 m/min, the adhesive is first cast onto a differential-release glassine liner and dried before lamination to clear polyester or polypropylene facestock. Metering is accomplished with a 120–140 line/cm gravure cylinder and a chrome doctor blade set at 0.15 mm blade gap; coat weight is controlled by gravure cell volume and line speed rather than by increasing blade pressure alone. The working compound is adjusted to 1,200–1,800 mPa·s at 25 °C and is supplied through a deaerating loop that maintains dissolved air below 4 vol%; otherwise, air entrainment at the gravure nip produces pin-window defects in the dried adhesive. A representative formulation for a transfer tape is 100 phr Covinax 324-00, 0.15–0.30 phr silicone-free defoamer, and sufficient associative thickener to raise low-shear viscosity without impairing high-shear flow at 10,000 s⁻¹. The transfer adhesive is dried to 0.3–0.7 wt% residual moisture before lamination to 23 µm polyester or 30 µm BOPP facestock. Roll quality is governed by unwind tension of 10–15 N/m and rewind taper tension from 15 N/m to 8 N/m across a 1.0 m diameter master roll. Terminal products include engineering transfer tapes for die-cut gaskets, foam spacers, and membrane switch spacers. The adhesive layer must pass PSTC-101 peel against stainless steel and PSTC-107 static shear at 1 kg/25 mm × 25 mm for at least 72 h at 23 °C; on low-energy films such as PVF and ultra-high-molecular-weight polyethylene, published data for this specific configuration is limited and converter-run peel values should be collected before final lot release.
Where labeling is applied to returnable glass bottles, the pressure-sensitive construction must survive 24 h immersion in water at 23 °C without paper facestock separation, yet detach under industrial caustic washing without adhesive or fiber residue. The aqueous-alkali stripping environment in bottle washers is typically 1.5–2.5 wt% sodium hydroxide at 75–85 °C for 30–60 s. Covinax 324-00 is compounded at 100 phr with a hydrophilically modified wax dispersion at 2–5 phr to reduce the wet plastic flow of the dried film. An external crosslinker is not used because crosslinking raises caustic detachment time beyond the commercial bottle-washer window. The adhesive is direct coated onto wet-strength label paper at 18–22 g/m² dry and dried through a conventional hot-air tunnel at a maximum web temperature of 75 °C. The backing liner is a 65 µm clay-coated glassine with a differential release value of 25–50 cN/25 mm under FINAT 10 test methodology; if release value exceeds 60 cN/25 mm, label dispensing jams on rotary Krones machinery. Food-contact compliance is limited to indirect food packaging under FDA 21 CFR 175.105; there is no direct beverage contact claim. Under the Packaging and Packaging Waste Directive 94/62/EC, the finished label must meet Article 11 heavy metal limits when the converter supplies EU beverage brands. Terminal products are wrap-around or spot labels for beer and beverage bottles. Batch release criteria include immersion peel retention under FINAT 9 and caustic detachment time measured by an in-house bottle-washer simulation; the critical functional requirement is clean separation without pressure-sensitive adhesive carryover into the washing solution.
Pressure-sensitive wine and spirit labels on cavitated BOPP facestock require the adhesive layer to remain optically clear after 24 h water immersion because whiteness from moisture penetration shows through the film. A compound of 100 phr Covinax 324-00 and 5–10 phr of a water-white hydrogenated rosin ester tackifier dispersion is coated at 16–20 g/m² dry onto 58 µm cavitated BOPP using a comma coater. The tackifier is added only after pH adjustment to 7.0–7.5; direct addition to acidic emulsion can shock-precipitate the rosin ester and produce fisheye defects visible in the dried adhesive. Drying from 70 °C to 90 °C across four zones is followed by lamination to a 62 µm white glassine liner. Optical inspection under an LED light panel at 5,500–6,500 K color temperature is used to detect gel particles above 50 µm, which are unacceptable for clear or light-colored dry goods labels. The finished label is tested for water whitening by total immersion in deionized water at 23 °C for 24 h; light transmittance reduction measured by ISO 13468-1 should not exceed 5 percentage points if no topcoat is used. Heavy metal limits under CONEG and EU Directive 94/62/EC Article 11 are applied to the entire construction, including paper, film, ink, and adhesive. Terminals are high-gloss beverage labels for still wines and distilled spirits. The adhesive is not intended for direct contact with dry ice or frozen storage below −20 °C; embrittlement of the dried acrylic film can occur when the label is applied at temperatures below −10 °C.
Exterior-grade graphic films for architectural window decoration and fleet marking are processed with Covinax 324-00 only when the dried adhesive film is protected by UV-stabilized overlaminate or when the facestock itself contains UV absorber. The emulsion is compounded with 0.3–0.6 phr of a dispersion-grade hindered amine light stabilizer and 0.5–1.0 phr of a 2-(2H-benzotriazol-2-yl)-p-cresol derivative UV absorber. These additives are introduced under low-speed cowles mixing to avoid shear-induced emulsion breakdown. The adhesive is cast onto a 50 µm polyester release liner at 25–30 g/m² dry and laminated to 70 µm plasticized white PVC or 75 µm cast vinyl. Drying is conducted at a maximum web temperature of 95 °C to prevent plasticizer migration from the facestock into the adhesive. Exposure testing is referenced to ISO 4892-2 method A with a xenon-arc lamp and 0.35 W/m² irradiance at 340 nm; the adhesive, covered by the facestock, is evaluated for discoloration and peel retention after 1,500 h. For electrical and electronic equipment graphic films, Directive 2011/65/EU Annex II hazardous substance restrictions apply to the entire component, including the adhesive. REACH (EC) No 1907/2006 Annex XVII entry 50 covers the restriction of specific phthalates if the plasticized vinyl facestock is included; the adhesive itself is not a plasticizer source. Terminal products are screen-printed or digitally printed graphic overlays with removable and permanent mounting options. The adhesive is not recommended for direct contact with rear-projection screens or clear polycarbonate glazing without prior compatibility testing because plasticizer migration and UV-induced acid formation from some polycarbonate grades can reduce tack.
| Application segment | Primary standard or regulation | Test parameter | Typical acceptance criterion or clause |
|---|---|---|---|
| Paper food label | FDA 21 CFR 175.105 | Indirect food-contact adhesive components | No direct food contact; dry food packaging use |
| Clear BOPP label | REACH (EC) No 1907/2006 Annex XVII | SVHC and restriction screening | No restricted substance above 0.1 wt% |
| Engineering transfer tape | PSTC-101 / PSTC-107 | 180° peel / static shear on stainless steel | Minimum peel as converter specification; shear ≥ 72 h |
| Returnable bottle label | EU Directive 94/62/EC Article 11 | Sum of Pb, Cd, Hg, Cr VI | ≤ 100 mg/kg |
| Cavitated BOPP label | ISO 13468-1 | 24 h water immersion light transmittance change | ≤ 5 percentage points |
| Outdoor graphic film | ISO 4892-2 | Xenon-arc exposure, 1,500 h | Peel retention reported by converter |
Competitive Covinax 324-00 prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Covinax 324-00 is an anionic, surfactant-stabilized vinyl acetate–ethylene copolymer dispersion supplied for waterborne pressure-sensitive adhesive compounding. The product is positioned for clear film labels, overlamination adhesives, and general paper and film tape constructions in which wet-out on untreated or lightly corona-treated polyolefin surfaces is required. Film formation proceeds by water and coalescing-agent evaporation from a two-phase dispersion, and the resulting dry adhesive is a continuous polymer film with a low glass transition temperature and residual hydrophilic functionality. Because the dispersion is water-compatible, it can be processed on standard aqueous coating equipment, including reverse roll, comma, and slot-die lines, without the explosion-proof drier and solvent recovery infrastructure required for ethyl acetate or toluene systems. The product is normally supplied in 1,000 L totes or bulk tanker service and is diluted on-site only with deionized water or a compatible water/alcohol blend.
Published technical data for vinyl acetate–ethylene PSA dispersions in this product class define the as-supplied limits that govern pumping, dilution, storage, and film build. The values below are class-typical ranges for Covinax 324-00; the manufacturer’s certificate of analysis is the controlling document for each batch, and published data for this specific configuration is limited where no certified product-specific value is available.
| Parameter | Typical value | Reference method |
|---|---|---|
| Nonvolatile content | 54–56% by mass | ISO 3251:2019 |
| pH | 4.0–5.0 | ISO 976:2021 |
| Brookfield viscosity at 25 °C | 1,500–3,500 mPa·s | ISO 2555:2018, spindle 3 at 20 rpm |
| Density | 1.04–1.07 g/cm³ (8.7–8.9 lb/gal) | ISO 2811-1:2016 |
| Glass transition temperature | −20 °C nominal, DSC midpoint | ASTM D3418-15 |
| Particle charge | anionic | — |
During polymer production, the nonvolatile content and particle size distribution are set by the monomer feed rate, surfactant ratio, and initiator profile in a semi-batch reactor. pH and viscosity are adjusted after residual monomer stripping. Because pH probes used in quality control can drift by 0.2–0.4 units if not cleaned, incoming pH values should be confirmed before acid or base additions. In production-scale storage, a slight viscosity increase after 7 days of recirculation is normal for VAE dispersions, but an increase above 20% of the as-supplied value indicates destabilization or microbial growth.
Because the dispersion is anionic under normal conditions, direct addition of cationic rheology modifiers, cationic surfactants, or aluminum sulfate produces bridging flocculation and visible grit in the wet film. pH adjustment should therefore be carried out with dilute ammonia or sodium bicarbonate under slow agitation, and the compounded pH should remain above 4.0 to prevent coagulation. In high-shear transfer from storage to the coating trough, diaphragm pumps are preferred over centrifugal pumps; the latter can exceed 10,000 s⁻¹ at the impeller tip and reduce apparent viscosity through shear thinning while entraining air. The product can be blended with acrylic emulsions, hydrocarbon tackifier dispersions, and plasticizer dispersions, but ester plasticizers with water solubility above 1.0 g/L may migrate to the release-liner interface and cause adhesive transfer or peel loss.
At the drying stage, the oven profile must remove water before complete film coalescence. A two-zone oven with zone temperatures of 80 °C and 120 °C is commonly evaluated for this class of emulsion, but web path length and air impingement velocity determine whether a given line can reach residual moisture below 0.5% by mass. Residual water above this level in roll stock can promote haze in clear film labels and reduce shear adhesion after 7 days. In slot-die coating, the high-shear viscosity at 10,000 s⁻¹ should be high enough to prevent ribbing; if ribbing appears, an associative thickener addition is preferred over an increase in solids because higher solids lowers drying capacity and increases film shrinkage. The wet coat weight is typically set to achieve a dry coat weight of 20–25 g/m² for film labels and 30–35 g/m² for industrial tapes.
Mechanical stability of the supplied dispersion can be assessed by ISO 2006:1985 after high-shear circulation. A stable lot shows no more than 0.05% coagulum on a 180 µm screen. Incoming QA should include screen residue because visible specks in clear film labels originate more often from shear-induced agglomeration in transfer pumps than from poor filtration. The minimum film-forming temperature of the base polymer is below room temperature, but the presence of hydrophobic tackifier dispersions can raise the effective film formation temperature; coalescing agents may still be required at 3–5 wt% of total solids to prevent mud-cracking in heavy coat weights. The choice of coalescing agent must be checked for its effect on 180° peel after 7 days, because slow-evaporating glycol ethers can plasticize the adhesive and reduce shear.
Pressure-sensitive adhesives based on Covinax 324-00 are evaluated on untreated high-density polyethylene and cast polypropylene using ASTM D3330/D3330M-04 for 180° peel and ASTM D6195 for loop tack. For this emulsion class, 180° peel on untreated HDPE after 24 h dwell at 23 °C typically falls between 0.8 N/25 mm and 1.8 N/25 mm at a dry coat weight of 20–25 g/m². The same formulation on untreated cast polypropylene often shows a 10–20% lower peel value. Loop tack is usually reported between 4 N/25 mm and 8 N/25 mm. These ranges are class-typical performance values, not product specifications; published data for Covinax 324-00 in this exact test configuration is limited.
If the finished adhesive is required to retain shear adhesion at elevated temperature, the response to crosslinker addition must be established because cohesive strength in VAE systems does not improve linearly with metal salt crosslinker concentration. With aluminum acetylacetonate, addition above 0.5 wt% of wet adhesive may shorten pot life to less than 8 h and produce gel particles on 25 µm slot-die filters. Below 0.2 wt%, the improvement in shear adhesion failure temperature may be less than 5 °C when measured by ASTM D4498-07 with a 1.0 kg static load. The usable processing window narrows as the base pH rises because the metal crosslinker hydrolyzes; therefore pH should be held at 4.5–5.0 before crosslinker injection. On production batch records, the most frequent failure is not low peel but filter plugging caused by localized pH spikes during crosslinker addition. These threshold values are starting points only; the exact addition level for Covinax 324-00 must be verified by a pot-life study under line conditions.
Hydrocarbon tackifier dispersions are typically added at 10–30 phr on dry polymer to raise peel, but peel strength passes through a maximum near 20–30 phr; above this level the adhesive loses cohesive strength and may leave residue on steel panels. Rosin ester tackifier dispersions provide higher tack but can reduce UV stability and increase yellowing in clear label films. Coating rheology is usually adjusted to 200–600 mPa·s at low shear for comma coating and 100–300 mPa·s for slot-die coating; the target depends on coat weight and web speed. These values are formulation targets, not product specifications. High-shear viscosity should be measured at 10,000 s⁻¹ by cone-and-plate rheometry according to ISO 2884-1:2006 because the product may be shear-thinning.
Compared with solventborne acrylic PSAs, the principal processing difference is that the coating fluid is a two-phase dispersion rather than a single-phase polymer solution. Solventborne acrylic lines using explosion-proof dryers and thermal oxidizers are not required for this emulsion; a direct thermal dryer with sufficient water evaporation capacity becomes the limiting equipment constraint. For a 1.2 m wide web running at 100 m/min, a waterborne adhesive at 55% solids requires an evaporation load roughly 2.5–4.0 times higher than a solventborne adhesive at 40% solids when the same dry coating weight is targeted. The oven capacity, not the coating station, often determines whether a plant can convert an existing solventborne line to Covinax 324-00 without reducing line speed.
Dry film properties differ from solventborne acrylics. Waterborne VAE films of this Tg class can exhibit higher tack on nonpolar surfaces immediately after coating, but they may show lower resistance to plasticizer migration and moisture whitening after 24 h water immersion. ASTM D870-02 water immersion testing is used to quantify blush and delamination; if a clear film application requires no haze after 24 h, an acrylic emulsion or solventborne acrylic may be required. The use of Covinax 324-00 reduces solvent exposure and VOC reporting burden in the coating room; as-supplied VOC is typically below 1,000 ppm for this product class, but the product’s safety data sheet remains the controlling document.
Among waterborne products, the main differentiation from Covinax 328-00 is the balance of tack and cohesion. Covinax 328-00 is formulated for higher effective cohesive strength in applications requiring static shear resistance; it can be blended with Covinax 324-00 in ratios from 20:80 to 50:50 to shift the failure mode from cohesive to adhesive without completely sacrificing low-energy peel. A blend study following ASTM D3654/D3654M-06 for shear adhesion and ASTM D3330/D3330M-04 for peel should be used to establish the ratio because the response of loop tack to blend ratio is often nonmonotonic. Compared with acrylic emulsion PSAs in the same solids range, the VAE backbone of Covinax 324-00 offers broader compatibility with hydrocarbon tackifier dispersions and lower formulation cost, but the dry film may require a metal salt or reactive crosslinker to match the high-temperature shear of a high-acid acrylic emulsion.
Storage outdoors or in direct sunlight is not recommended. The product should be kept at 5–35 °C and protected from freezing because freeze-thaw cycling can produce coagulum that plugs 100 µm filter socks. The expected shelf life for this class is commonly quoted as 6 months from the date of manufacture in unopened totes; after opening, the headspace should be blanketed with nitrogen or the material consumed within 30 days to prevent surface skinning. The product is not compatible with cationic starches, aluminum sulfate, or strong acids. For food-contact applications, the compounded final adhesive must be evaluated under 21 CFR 175.105 or 21 CFR 176.170 as appropriate, and the supplier’s current regulatory statement should be obtained for the neat dispersion.
