| HS Code | 938459 |
| Product Name | Covinax 770-10 |
| Product Type | Polyvinyl acetate (PVAc) emulsion |
| Appearance | Milky white liquid |
| Solids Content Wt Percent | 55 ± 1 |
| Viscosity Cp | 2500 - 3500 (Brookfield, 25°C) |
| Ph | 4.5 - 5.5 |
| Specific Gravity | 1.08 - 1.10 |
| Particle Size Microns | 1 - 3 |
| Glass Transition Temperature C | 25 - 30 |
| Minimum Film Forming Temperature C | 10 |
| Film Appearance | Clear, transparent, and flexible |
| Storage Shelf Life | 12 months when stored at 10-30°C |
As an accredited Covinax 770-10 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | The chemical Covinax 770-10 is packaged in 200 kg net polyethylene-lined drums, 1000 kg IBC containers, and bulk tankers. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Covinax 770-10: secure drums/pails, label properly, ventilate, prevent shifting, ensure compatibility and safety. |
| Shipping | Covinax 770-10 is shipped as a liquid industrial chemical in sealed drums, totes, or bulk containers. Keep containers upright, dry, and away from heat or ignition sources. Ensure proper labeling and secure loads to prevent spills. Consult the Safety Data Sheet for specific regulatory classifications and transport requirements. |
| Storage | Store Covinax 770-10 in a cool, dry, well-ventilated area away from direct sunlight, heat sources, and open flames. Keep containers tightly sealed when not in use to prevent moisture absorption and contamination. Maintain temperatures within the manufacturer’s recommended range, and separate from incompatible materials such as strong oxidizers or acids. Ensure proper labeling and access to spill containment. |
| Shelf Life | Covinax 770-10 has a shelf life of 12 months from production date when stored unopened in a cool, dry place. |
In rotary label converting, an anionic surfactant-stabilized aqueous dispersion supplied as Covinax 770-10 is transferred from a closed tote to a servo-driven slot-die coating station fitted with a 0.45 mm shim and a recirculating low-shear gear pump. The starting formulation for roll-fed machine-glazed paper label stock contains 90.0 parts Covinax 770-10, 8.0 parts 50 wt% hydrogenated rosin ester tackifier dispersion, 0.5 parts acetylene diol wetting agent, 0.2 parts mineral-oil defoamer, and 0.3 parts hydrophobically modified ethoxylated urethane thickener; deionized water is added until Brookfield RVT viscosity at 20 °C, spindle 4, 20 rpm falls between 3,000 and 4,000 mPa·s. On a 3-zone air-float tunnel, wet deposition of 18–22 g/m² dry after 70/90/110 °C zone setpoints and a dew-point-controlled exhaust yields residual moisture below 0.3 wt%, after which the adhesive is laminated to a silicone-coated glassine liner and wound with interleave tension below 0.6 N/mm. Observed production failure is micro-foam in the recirculation loop when pump speed exceeds 1,200 rpm; vacuum deaeration at –0.8 bar for 20 min is applied before coating. Compliance for indirect food-contact paper labels is assessed under FDA 21 CFR 175.105 and EU Regulation 1935/2004, with migration documentation following EU 10/2011 where the label is part of a multi-layer laminate; peel and loop-tack data are generated according to FINAT FTM 1 and FINAT FTM 9, and the converter also records ISO 9001:2015 batch traceability. Terminal products include logistics barcode labels, wine label paper, prime shelf-edge labels, and freezer-grade paper labels when the raw stock is pre-treated and the adhesive coat weight is raised to 22–24 g/m².
Clear-on-clear polypropylene and polyester film labels require a wetting envelope below 30 mN/m on substrates whose untreated surface energy is commonly 30–32 dyn/cm; inline corona treatment is therefore set to a minimum 48 dyn/cm, and the adhesive is diluted with 2–5 parts of deionized water only after the wetting agent has been incorporated. A cleanroom label formulation uses 94.0 parts Covinax 770-10, 4.5 parts water-white hydrocarbon resin dispersion, 1.0 part synthetic amorphous silica rheology modifier, 0.3 parts polyether siloxane defoamer, and 0.2 parts benzisothiazolinone-based biocide; the final viscosity is held at 1,500–2,500 mPa·s for slot-die operation at 50–100 m/min, with slot gap 0.25 mm and die-to-web spacing 0.20 mm. The drying profile uses 80/95/115 °C in a 4-zone flotation oven, and the finished adhesive is married to a 23 μm PET release liner at 2–4 N/cm. Standards invoked for label food-contact compliance are 21 CFR 175.105, Regulation (EC) 1935/2004, and GB 9685-2016 for converters exporting to China; formulation change control is maintained under ISO 9001:2015. The observed defect transition occurs above 100 m/min when die-lip build-up, not substrate wetting, becomes dominant, and a monofilament wiper is run across the lip every 20 minutes to prevent ribbing lines. Published formulation-specific peel data for this exact clear-on-clear configuration is limited; converters therefore confirm initial adhesion on actual facestock by FINAT FTM 1 before full-width coating. Terminal products include clear prime labels, no-label-look PET labels, HDPE squeeze-tube labels, and over-laminating film for digitally printed packaging.
Carton window patching with biaxially oriented polyester film places a specific demand on high-shear rheology at 12,000–18,000 s⁻¹ under a profiled slot coater; shear-thinning behaviour is verified by cone-and-plate viscosity at 10,000 s⁻¹ rather than a low-shear Brookfield value. A window-patch adhesive formulation uses 85.0 parts Covinax 770-10, 12.0 parts dibenzoate ester plasticiser dispersion, 1.5 parts hydrophobically modified alkali-swellable thickener, 0.3 parts ammonium hydroxide to hold pH 6.8–7.2, and 1.2 parts propylene glycol as open-time extender. The adhesive is applied directly to bleached sulphate board at 120–180 m/min; the film is introduced at 0.8–1.2 N/cm nip, and the adhesive is dried with a combination of IR and air impingement at 60–80 °C board-surface temperature. Compliance for food-grade cartons is documented against FDA 21 CFR 175.105, EU Regulation 1935/2004 Article 3, and 21 CFR 176.170 where the board contacts aqueous or fatty foods. Terminal products include windowed bakery cartons, pasta boxes, gift cartons, and cosmetic window cartons.
On low-density polyethylene carrier film for temporary surface protection, the coating is applied by reverse roll at 35–65 g/m² wet, and the dryer setpoints are deliberately capped at 85 °C, because the polyethylene web begins necking at a tension above 120 N/m and a surface temperature above 45 °C. A starting formulation uses 95.0 parts Covinax 770-10, 3.0 parts water-dispersible aliphatic polyisocyanate crosslinker, 1.0 part triethylamine catalyst pre-diluted 1:10 with deionized water, and 1.0 part non-silicone defoamer; pot life at 23 °C is 4–6 h, and the formulation must be applied within that interval to avoid viscosity drift above 35%. The linerless film is dried through 5 zones with profile 50/65/75/80/85 °C, residual moisture measured by Karl Fischer oven at 0.2–0.4 wt%, and then wound with a lay-on roller set at 30–40 N/m; adhesion is evaluated after 24 h conditioning according to ASTM D3330/D3330M-04(2018) using 180° peel on stainless steel, and tensile properties of the polyethylene film are verified with ASTM D882-18. Compliance is documented under REACH Regulation (EC) No 1907/2006 Annex XVII and RoHS Directive 2011/65/EU recast (EU) 2015/863 for electronic-industry transit films. Terminal products include appliance panel protection film, automotive transit film, powder-coated door-frame masking, and temporary scratch-protection film for coil-coated aluminium.
On tissue-reinforced industrial splicing tapes, the adhesive layer must withstand a 90° peel-rate differential between slow tack and flying-splice unwind at up to 600 m/min without cohesive splitting; batch release includes a high-shear viscosity test at 10,000 s⁻¹ and a loop tack test according to FINAT FTM 9. The coating compound is formulated with 92.0 parts Covinax 770-10, 6.0 parts aliphatic hydrocarbon tackifier dispersion, 1.0 part pyrogenic silica post-added under sawtooth high-shear dispersion at 1,500 rpm for 15 minutes, and 0.2 parts mineral-oil defoamer. Transfer coating onto a silicone release paper is run at 45–80 g/m² wet with comma blade gap 0.30–0.50 mm, three-zone drying at 70/100/120 °C, and lamination to a 20 g/m² tissue-reinforced paper carrier at 1.5–2.5 N/cm. Because the adhesive is anionic, the release liner must have a tight silicone cure; incomplete silicone crosslinking causes liner transfer and has been observed as periodic adhesive build-up on the rewinder idlers. Standards include ASTM D3759/D3759M-05(2019) for carrier tensile, ASTM D3330/D3330M-04(2018) for peel, and ISO 13934-1 for nonwoven component tensile, with product documentation under ISO 9001:2015. Terminal products include single-sided industrial splicing tape, core-start tape, and tape for butt-splicing printed packaging films.
Paper-to-film lamination for book covers and tote bags requires a lower surface tack after drying than label stock, so the formulation shifts from tackifier-dominated to plasticiser-dominated composition: 82.0 parts Covinax 770-10, 15.0 parts benzoate ester plasticiser dispersion, 2.5 parts fumed silica matting agent, 0.3 parts non-ionic surfactant, and 0.2 parts defoamer. Block resistance is controlled by drying to residual moisture below 0.5 wt% and by keeping the dry adhesive coat weight at 8–12 g/m², because above 12 g/m² the addition of plasticiser causes measurable blocking at 40 °C and 70% RH after 24 h. The wet adhesive is applied by reverse gravure to a corona-treated polypropylene film at 80–120 m/min, passed through a 3-zone oven at 60/75/90 °C, and immediately nipped to printed paper stock at 1.0–2.0 N/cm. Compliance for interior packaging uses FDA 21 CFR 175.105 and EU Regulation 1935/2004; for toys and stationery grades, heavy-metal migration is limited by EN 71-3:2019+AC:2020 and RoHS Directive 2011/65/EU. Terminal products include laminated book covers, gift wrap, shopping bags, and folding carton outer wraps.
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In aqueous converting adhesives, the grade designation Covinax 770-10 is applied to a surfactant-stabilized vinyl acetate-ethylene (VAE) copolymer dispersion supplied at elevated solids for reduced water load in packaging and laminating operations. The ethylene comonomer is polymerised into the backbone rather than added as a migrant, so the dried film retains flexibility at low temperatures without dibutyl phthalate or benzoate external plasticizers. This compositional position separates the product from conventional poly(vinyl acetate) homopolymer dispersions and from solventborne polyurethane adhesives used in dry laminating.
The specification profile of Covinax 770-10 is obtained through the methods listed in the table below. The values are typical mid-range data from the manufacturer’s technical literature, not batch release limits. They should be confirmed against the current technical data sheet before production qualification.
| Property | Typical published value | Method |
|---|---|---|
| Solids content | 62.5% ± 1.0% by mass | ISO 3251 |
| Viscosity at 25 °C | 3,000–5,000 mPa·s; Brookfield RVT #4 at 20 rpm | ISO 2555 |
| pH at 25 °C | 4.5–5.5 | ISO 976 |
| Density | 1.06 g/cm³ | ISO 2811 |
| Glass transition temperature | -25 °C ± 5 °C, midpoint | ASTM D3418 |
| Minimum film formation temperature | ≤ 0 °C | ISO 2115 |
| Emulsion charge | Anionic | zeta potential, ISO 13099-1 |
Because the dispersion is anionic, zeta potential measurements under ISO 13099-1 provide a quality indicator for stabilizer integrity; a loss of anionic charge after addition of cationic wetting agents can produce coagulation in recirculation lines. The glass transition temperature of -25 °C ± 5 °C as determined by ASTM D3418 under nitrogen at 10 K/min heating rate places the material in the cold-flexible class without the use of external plasticizer.
On high-speed paper-to-film laminating lines, the usable process window is controlled by the interaction of anilox transfer shear, open time, and nip dwell pressure. A 2.4 m wide laminator fitted with a 180-line ceramic anilox roll and a 0.2 mm doctor blade gap can apply the compounded adhesive at 20–25 g/m² wet without excessive misting if the product is maintained at 20 °C to 30 °C. At temperatures below 15 °C, the viscosity rises above the coating head’s transfer window and the roll surface may show skip coating; at temperatures above 40 °C, edge skinning becomes significant because the dispersion is thermoplastic and water evaporates rapidly at the roll ends.
The supplied emulsion viscosity of 3,000–5,000 mPa·s at 25 °C reflects a pseudoplastic behaviour that collapses under anilox shear. This permits transfer through 120–180 cells per linear inch without the high-shear degradation observed with higher-molar-mass associative thickeners. However, shear rates above 50,000 s⁻¹ in closed-chamber doctor systems can generate local heating and destabilize the anionic surfactant stabilizer. Batch-to-batch viscosity variation of ±500 mPa·s is not unusual in totes; the first adjustment should be a 5 °C to 10 °C temperature trim, not water addition, because water addition lowers solids and extends the set time beyond the line’s compression dwell.
Open time on uncoated kraft at 23 °C and 50% RH is generally 8–15 s for a wet coat weight of 20–25 g/m². Under plant conditions with air movement above 0.5 m/s or at 35 °C, the interval shortens to 3–6 s; if the nip closes after skin formation, the bond fails at the interface rather than through fibre tear. Nip pressure between 0.3 and 0.7 MPa on a 380 mm diameter rubber-covered roll provides sufficient penetration into the fibre mat without squeezing the adhesive from the bond line. For corona-treated polyethylene with surface energy below 38 mN/m, in-line corona treatment is required to achieve wetting; without treatment, peel values obtained under ISO 11339 can fall below 1.0 N/15 mm, and the failure remains interfacial. Published data for exact peel values on all film grades is limited; production substrate qualification is required.
On recycled board, fibre tear is typically obtained when adhesive penetration depth reaches 15–30 µm. Insufficient penetration produces cohesive failure, while wet add-on above 35 g/m² causes warping and slows set. These thresholds define the practical operating envelope for the grade.
Case and carton sealing formulations based on Covinax 770-10 are normally diluted to 52%–55% solids or used as supplied depending on compression belt dwell and board porosity. On side-seam gluing stations running at 30–120 m/min, the wet tack is sufficient to fibre-fracture uncoated kraft after 2–5 s compression. Clay-coated board with a pore volume below 0.3 cm³/g retards water absorption and delays setting; in that condition, the high-solids form of the product without dilution maintains contact at the interface. The grade differs from homopolymer PVAc dispersions in that it retains flexibility at freezer temperatures and requires no external plasticizer to meet cold-chain impact resistance. Water resistance is moderate; continuous immersion resistance should not be claimed without adhesion testing under ASTM D1151 cyclic humidity exposure or the end-use simulation specified by the packaging brand owner. For indirect food contact, the finished adhesive formulation must be assessed under FDA 21 CFR 175.105 and, where applicable, EC 10/2011 migration limits; the raw emulsion alone does not carry food-contact approval.
When a formulator considers replacing a plasticized PVAc with Covinax 770-10 in cold-stable label adhesives, the decision turns on glass transition temperature, plasticizer migration kinetics, and wetting on low-energy facestocks. Plasticized poly(vinyl acetate) homopolymers exhibit a neat-polymer glass transition temperature near 35 °C; after modification with 10%–20% dibutyl phthalate or benzoate, the Tg is depressed but migration can occur under heat and pressure, producing embrittlement and bond yellowing. Covinax 770-10 avoids this failure mode because ethylene is incorporated directly into the polymer chain, reducing the Tg to approximately -25 °C without a mobile flexibilizer. For cold-stable label adhesives applied at 4 °C, the VAE film retains compliance while many plasticized PVAc films show increased storage modulus and loss of peel adhesion. The VAE grade also wets corona-treated polyethylene and oriented polypropylene more readily than a PVAc homopolymer because the wet adhesive has a lower surface energy. Acrylic emulsions for clear film labels frequently exceed VAE in weatherability and resistance to plasticizer migration from PVC facestocks, so the selection rule is application-specific.
| Parameter | Covinax 770-10 VAE | Plasticized PVAc homopolymer | Acrylic emulsion PSA |
|---|---|---|---|
| Neat-polymer glass transition | -25 °C ± 5 °C | 35 °C without plasticizer; 5 °C–15 °C after modification | -40 °C to -20 °C |
| External plasticizer requirement | None | Required for cold flexibility | None for many grades |
| Adhesion to corona-treated PE | Medium to high | Low to medium | High |
| Water whitening resistance | Moderate | Moderate | Good |
| Cost position per dry kilogram | Mid-range | Lower | Higher |
| Typical service temperature | -10 °C to 60 °C | 0 °C to 50 °C without formulation | -30 °C to 80 °C |
The comparative data in the table are generalized from emulsion polymer literature and supplier technical bulletins; direct side-by-side qualification on the intended facestock and liner is required because surface energy and silicone release chemistry dominate peel performance.
Storage of the dispersion in 316L stainless steel or high-density polyethylene totes at 5 °C to 30 °C is required. Freeze-thaw exposure below 0 °C produces irreversible coagulum; the material cannot be re-dispersed by normal plant agitation. The anionic stabilizer is sensitive to multivalent cations, so dilution water with calcium ion above 100 mg/L should be avoided. pH adjustment with ammonia or amine-based additives above 7.0 may thicken the product and change its mechanical stability under high-shear pumps. The product is compatible with borax at low addition levels, but borax response depends on polymer acid content and must be measured by a viscosity build curve at 0.1% increments. High-shear progressive cavity pumps with stator clearance below 0.5 mm can generate local heating; a 10-minute recirculation test at 25 °C and 300 min⁻¹ is a practical check before line startup.
Rheology adjustments for high-speed transfer often use alkali-swellable emulsions or associative thickeners. In formulations based on Covinax 770-10, the addition of an alkali-swellable thickener in increments of 0.1% dry solids on formulation mass requires a pH above 6.5 for full swelling; above 8.5, the same thickener can reduce shear stability. The resulting viscosity drift during the first 24 h is typically 10%–15% upward at 25 °C and should be anticipated in quality control release before the adhesive is shipped to the converting line. If the pH is maintained between 4.5 and 5.5, the product can be thickened with fumed silica, but this route increases high-shear viscosity and may require a longer open time. Plant viscosity measurements should use a Brookfield RVT spindle #4 at 20 rpm after a 60-minute temperature equilibration; record temperature because a 1 °C change shifts viscosity by approximately 5% in this solids range.
Batch release testing should include solids by ISO 3251, pH by ISO 976, viscosity by ISO 2555, and a mechanical stability test using a high-speed disperser at 3,000 rpm for 10 minutes. Coagulum collected on a 100 µm sieve should be below 0.1% of total batch mass. If coagulum exceeds this limit, the batch is not suitable for use with closed-chamber anilox equipment because screen clogging and transfer defects will occur.
