| HS Code | 393135 |
| Product Type | Biodegradable water-soluble polyvinyl alcohol (PVA) resin |
| Appearance | White granular powder |
| Degree Of Hydrolysis | 77 mol% |
| Viscosity | 80 mPa·s (4% aqueous solution, 20°C) |
| Density | 1.10-1.20 g/cm³ |
| Melting Point | 165-175°C |
| Glass Transition Temperature | 45-55°C |
| Tensile Strength | 25-35 MPa |
| Elongation At Break | 300-500% |
| Water Solubility | Soluble in warm/hot water |
| Biodegradability | Biodegradable under aerobic conditions |
| Processing Compatibility | Suitable for extrusion, film casting, and injection molding |
As an accredited Nichigo G-Polymer AVE8077P factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Nichigo G-Polymer AVE8077P is packaged in 25 kg multi-wall paper bags with PE inner liner, shrink-wrapped on pallets. |
| Container Loading (20′ FCL) | Container Loading (20′ FCL) for Nichigo G-Polymer AVE8077P: palletized bags loaded into 20ft container, secured and evenly distributed. |
| Shipping | Nichigo G-Polymer AVE8077P is shipped as solid pellets in moisture-protective paper bags on pallets. It is non-hazardous under standard transport regulations. Keep dry, avoid direct sunlight, and store below recommended temperatures. Handle gently to prevent bag damage and ensure secure stacking during transport. |
| Storage | Store Nichigo G-Polymer AVE8077P in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Protect from moisture and humidity to prevent clumping or degradation. Keep separated from incompatible materials and out of reach of unauthorized personnel. Follow manufacturer’s shelf-life guidelines. |
| Shelf Life | Store in original sealed container in a cool, dry place. Shelf life is typically 12 months from date of manufacture. |
Cast-film trials on a five-layer coextrusion line with a 75 mm barrier extruder and 24:1 L/D screw have shown that Nichigo G-Polymer AVE8077P can be run as a discrete barrier core when the core layer thickness is held between 5 µm and 8 µm. The barrier layer mass fraction is maintained from 6% to 10% of total film grammage. Pellets are pre-dried at 70°C for 3 h to 4 h to reduce moisture content below 0.2%. Residual moisture above 0.3% causes bubble nucleation at the die lip. The barrier extruder temperature profile is set from hopper to die at 160°C, 175°C, 185°C, 195°C, and 200°C. Melt temperature is limited to 215°C to suppress thermal degradation of vinyl alcohol units. Maleated polyolefin tie layers are run at 3 µm to 5 µm per side. Polypropylene skins are run at 20 µm to 25 µm per side. Line speed is usually limited to 80 m/min to 150 m/min by draw resonance of the barrier layer. Oxygen transmission rate is measured according to ASTM D3985 at 23°C and 0% RH. A 6 µm core typically falls below 1.0 cm³/(m²·day·atm). At 75% RH external humidity, measured oxygen transmission increases by more than one order of magnitude unless the outer polyolefin layers provide sufficient water vapor resistance. Adhesion is tested by T-peel according to ASTM D1876. A minimum release value of 4 N/15 mm is commonly applied before the film is approved for lamination. Food-contact status rests on 21 CFR 177.1670 for the polyvinyl alcohol layer and on EU Regulation 10/2011 for the finished multi-material structure. Migration testing under EU 10/2011 is required on the final laminate. Amine-based slip additives in the skin layer should be avoided because they can migrate to the barrier core and cause local crosslinking and yellowing at the interface. Terminal structures include lid film for oxygen-sensitive dairy and processed-meat packages, stand-up pouches for dry flowable foods, and lamination webs for retortable medical device packaging. The dominant production fault is interfacial delamination at the tie layer. Published data for this specific configuration is limited; lot-specific melt flow index and moisture content should be verified against the supplier certificate of analysis.
Coextruded sheet for high-barrier cups and trays is produced on a tandem extrusion line with the AVE8077P core at 8% to 15% of total sheet thickness. Total sheet gauge is normally between 0.8 mm and 1.2 mm. The barrier core is checked by cross-sectional microscopy before forming. Core thickness is held at 80 µm to 150 µm. The forming window is narrow. Sheet surface temperature must reach 120°C to 140°C for uniform thinning of the polypropylene skins. The AVE8077P core must remain below 180°C at the plug contact point. Plug-assisted pressure forming is used with a plug temperature of 80°C. Plug speed is set at 150 mm/s to 250 mm/s. Draw ratio is capped at 3:1. Beyond that value the barrier core splits into discontinuous lenses. Oxygen transmission of formed cups is measured according to ASTM F1927 or ISO 15105-1 at 23°C and 50% RH. A continuous 100 µm barrier core typically yields values below 0.8 cm³/(m²·day·atm) after forming. Water vapor transmission is measured according to ASTM F1249 at 38°C and 90% RH. AVE8077P alone is not an adequate moisture barrier. The outer polyolefin layers carry most of the moisture resistance. Compliance for direct food contact in the EU is assessed under EU Regulation 10/2011. In the US, the relevant provisions are 21 CFR 177.1670 for the vinyl alcohol polymer and 21 CFR 177.1390 for the laminate when polyolefin skins are used. Terminal products include shelf-stable soup cups, dairy dessert trays, and modified-atmosphere packaging trays for fresh-cut produce. The dominant production defect is post-form core cracking at the cup corner. This is evaluated by vacuum dye-leak testing on formed cups. Retortable structures are further checked by oxygen transmission after a 6-hour retort at 121°C.
Extrusion coating of AVE8077P directly onto corona-treated solid bleached sulphate paperboard has been evaluated as a replacement for polyvinylidene chloride dispersion coatings on folding cartons. The polymer is melt-fed through a 120 mm 30:1 L/D single-screw extruder at 195°C to 210°C. It is coated through a slot die onto a paperboard web preheated to 60°C to 80°C. Coating weight is controlled between 10 g/m² and 20 g/m². Line speed is adjusted between 80 m/min and 150 m/min. Below 8 g/m², pinhole density increases sharply. Adhesion is improved by in-line corona at 2 kW/m to 4 kW/m. A water-based primer is applied at 0.5 g/m² to 1.0 g/m² dry coat weight before extrusion. Water resistance of the coated board is measured by Cobb 1800 water absorption according to ISO 535. A 12 g/m² AVE8077P coating typically shows higher water absorption than a PVdC-coated board unless a secondary heat-seal or top coat is applied. Oxygen transmission rate is measured according to ASTM D3985 at 23°C and 50% RH. Conditioning at 85% RH before testing raises the oxygen transmission rate significantly because adsorbed water plasticizes the vinyl alcohol layer. US food-contact status for coated paperboard is evaluated under 21 CFR 176.170 and 21 CFR 176.180. EU status requires compliance with EU Regulation 10/2011 and with EC 2023/2006 for good manufacturing practice. Terminal products are high-barrier folding cartons for cereal, dry beverage powders, chocolate-confectionery overwrap, and microwaveable paperboard trays. The most common failure mode is coating separation at crease lines. Crease-barrier integrity is checked by methylene blue penetration testing on folded board samples.
Blown monolayer film from AVE8077P is run on a 45 mm extruder with a 25:1 L/D barrier screw and a 250 mm die. Die gap is 0.8 mm. Melt temperature at the die is held between 190°C and 205°C. Above 210°C, gel specks appear at the die lip and bubble stability deteriorates. Blow-up ratio is set between 2:1 and 3:1. Frost-line height is kept at 1.5 to 2.0 die diameters by adjusting external air ring flow. Film thickness is monitored in the range 30 µm to 60 µm. Relative humidity during processing must remain below 60% RH. Higher humidity causes surface tack and blocking on the winder. Water dissolution time is tested in 25°C water under a standard vessel and agitation protocol. Complete dissolution of an unsealed 40 µm film is expected within 1 min to 3 min. Heat-seal strength is measured according to ASTM F88. Sealing pressure is 0.3 MPa. Dwell time is 0.5 s. Jaw temperature is 160°C to 180°C. A seal strength above 8 N/25 mm is commonly required for liquid detergent pods. AVE8077P is not a functional barrier for aggressive organic solvents. Solvent-based agrochemical formulations can cause swelling and seal failure. Regulatory compliance for detergent pods is based on manufacturer-specific safety assessments and packaging migration limits under EC 1907/2006. Finished-product producers must confirm packaging suitability for each detergent and solvent formulation. Published data for this specific configuration is limited; dissolution time and seal strength should be verified against the finished-film certificate of analysis. Terminal products include monodose liquid laundry detergent pouches, dishwasher detergent sachets, water-soluble agrochemical pre-weighed powder bags, and dye transfer inhibitor sheets.
Injection moulding evaluations of AVE8077P as a discrete barrier phase in multi-laminate preforms have been carried out on a co-injection system with a 180 t clamp force and two injection units. The barrier phase is metered at 5 wt% to 10 wt% of total preform weight. The AVE8077P injection cylinder is kept at 190°C to 210°C. The polypropylene substrate cylinder runs at 220°C to 240°C. Mold temperature is held at 15°C to 20°C. The polymer is injected as a continuous core within the preform wall and encapsulated by the polyolefin substrate. Target barrier layer thickness after injection blow moulding is 20 µm to 40 µm. Oxygen transmission rate of the finished bottle is measured according to ASTM D3985 at 23°C and 50% RH. Bottles with a complete AVE8077P layer typically show oxygen transmission below 0.05 cm³/(package·day·atm) for a 500 mL bottle, depending on surface area and wall thickness. The process window is limited by the crystallisation temperature of the barrier phase. If mold temperature exceeds 30°C, the barrier layer may crystallise prematurely and delaminate from the substrate. Adhesion is checked by microtome sectioning and drop-impact testing according to ASTM D2463 or ISO 7765-1. Food-contact statements for medical or pharmaceutical closures must be supported by specific migration testing under EU Regulation 10/2011 or FDA 21 CFR 177.1670 for the vinyl alcohol layer. Terminal components include oxygen-sensitive pharmaceutical vials, cosmetic ampoules for retinol formulations, and barrier closures for beverage concentrates. The dominant defect is incomplete encapsulation of the barrier phase at the gate. This is detected by infrared microscopy of the gate cross-section and by oxygen transmission audit testing on first-shot samples.
Textile warp-sizing trials have been conducted by dissolving AVE8077P in demineralized water at 80°C to 90°C. A sizing bath with 8% to 12% solids is prepared. The solution is held at 65°C to 85°C in the sizing box. High-tenacity polyester warp yarn is passed through the size bath. Squeeze rolls are operated at 1.5 bar to 2.5 bar nip pressure. Size pick-up on the yarn is controlled between 6% and 10% dry weight on yarn by adjusting solids and nip pressure. The yarn is dried over steam-heated cylinders at 110°C to 130°C and wound onto the loom beam. No plasticizer or added crosslinker is used in this configuration. Weaving efficiency is influenced by residual moisture content of the sized beam. Moisture content above 8% can cause yarn blocking on the beam. Desizing is carried out in hot-water washing at 80°C to 90°C with mechanical agitation. The polymer is water-soluble and does not require oxidative desizing agents. Desizing effluent is monitored for chemical oxygen demand according to ISO 6060. Typical COD loads reflect the total size applied to the fabric. Occupational and environmental exposure is assessed under REACH (EC 1907/2006). Residual size on finished fabric is checked by extraction weight loss or by a qualitative iodine-borate spot test. Terminal products are densely woven polyester and polyester-cotton blend fabrics for non-food industrial end uses, conveyor belts, outdoor upholstery, and coated fabric substrates. The main processing limit is that AVE8077P is not effective on greige cotton warp yarns with high natural wax content without additional surfactant washing. Wetting agents are required when cotton size pick-up target exceeds 4%.
Competitive Nichigo G-Polymer AVE8077P 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!
Nichigo G-Polymer AVE8077P is a pelletized butenediol vinyl alcohol copolymer within the G-Polymer series. The material is designed for melt processing on conventional plastics equipment without the water or external plasticizers required by traditional polyvinyl alcohol. Published datasheets for the G-Polymer series report a density of approximately 1.24 g/cm³, a glass transition temperature near 60 °C, and crystalline melting behavior in the 170–190 °C window; because grade-specific values may shift with comonomer content and molecular mass, the lot certificate for AVE8077P should be used for acceptance testing. Melt flow rate is typically measured under ISO 1133-1:2022 at 210 °C with a 2.16 kg load. The product is applied in extrusion, coextrusion, injection molding, and thermoforming where water solubility, compostability, and oxygen barrier at low relative humidity are functional requirements.
Traditional partially hydrolyzed polyvinyl alcohol cannot be processed as a pure melt because its crystalline melting point lies above the onset of thermal degradation. Processors therefore dissolve it in water for solution casting or add plasticizers such as glycerol to reduce the melting point. Plasticized PVOH exhibits plasticizer migration, humidity-dependent tack, and mechanical drift over time. AVE8077P avoids these effects by copolymerizing a diol-type comonomer into the chain; the comonomer interrupts the crystallite sequence enough to bring the melting point below 200 °C while retaining water solubility. In comparison with ethylene vinyl alcohol copolymer, EVOH is melt-processable and has good oxygen barrier at low humidity, but it is not water-soluble and is not designed to disintegrate in aqueous or composting environments. The difference is therefore not merely a flow adjustment: AVE8077P changes the end-of-life and dissolution profile relative to EVOH while changing the process route relative to conventional PVOH.
| Property or processing characteristic | AVE8077P | Conventional PVOH | EVOH |
|---|---|---|---|
| Direct melt processing without water or plasticizer | Yes | No | Yes |
| Water solubility at ambient temperature | Yes | Yes | No |
| Oxygen barrier at 0% RH | High | High | Very high |
| Oxygen barrier at 75% RH | Reduced | Reduced | Reduced |
| Plasticizer migration risk | None | Present | None |
| Aerobic biodegradation pathway | Compostable | Compostable | Limited |
Oxygen transmission through dry butenediol vinyl alcohol copolymer is controlled by the dense hydrogen-bonded amorphous network. Films tested at 23 °C and 0% relative humidity according to ASTM D3985-24 typically fall below 0.1 cm³·mm/(m²·day·atm). At 75% relative humidity, absorbed water acts as an internal plasticizer, and the oxygen transmission rate increases by orders of magnitude. This property cliff defines the application window: monolayer packaging is generally unsuitable for humid environments or high-water-activity products. Coextruded sheet places AVE8077P as a core layer between polyolefin skins that limit moisture ingress; tie resins are selected for melt-viscosity compatibility at the die. Published data for this specific grade in coextruded thermoformed trays is limited, but the moisture sensitivity mechanism is common to the G-Polymer series.
Drying is the first critical control point. The resin pellets should be dried to a moisture content below 0.20% before extrusion and below 0.10% before injection molding, as determined by ISO 15512:2019. A desiccant dryer with a dew point not higher than -30 °C and an inlet air temperature of 80 °C for 4 h is a normal starting condition. Drying above 90 °C should be avoided because pellet surface fusion and bridging in the hopper can occur.
Extrusion is performed on a single-screw extruder with L/D between 24:1 and 30:1. A screw with a compression ratio of 2.5:1 to 3.5:1 and no intensive mixing section is preferred; high-shear elements increase melt temperature and generate acetic acid from elimination reactions. Barrel temperatures are typically set from 180 °C in the feed zone to 210 °C in the metering zone, with the adapter and die held between 195 °C and 210 °C. Melt temperature above 230 °C should be avoided. At the die, a draw ratio below 5:1 reduces the risk of melt curtain instability. If edge gels form in cast film, the shutdown and purge procedure should remove dead spots in the adapter or screen changer.
Production-scale extrusion of butenediol vinyl alcohol copolymers is often limited by screw residence time rather than by drying alone. On a 60 mm single-screw extruder with an L/D of 30:1 operating at 80 kg/h, processing experience with the G-Polymer series indicates that an acetic acid odor and rising melt pressure can occur when the metering zone exceeds 210 °C for extended periods. The use of a single 20/40 mesh screen pack instead of a fine multi-screen stack reduces melt stagnation. At shutdown, the barrel is purged with a low-melt-flow polyethylene or polypropylene until the discharge is clear; leaving the resin in a hot barrel can degrade the polymer and release water and acetic acid, which corrode tool steel if not purged.
The shear viscosity of AVE8077P is shear-thinning and more temperature-sensitive than low-density polyethylene. Capillary rheometry according to ISO 11443:2021 can be used to generate viscosity curves at 180 °C, 200 °C, and 220 °C. The processing window between the melting point and degradation onset is narrower than for polyolefins; a flat temperature profile with no high-temperature zones is preferred. Because water generated during degradation is autocatalytic, localized overheating in a screw dead spot can accelerate further chain scission. Film and sheet lines therefore use low-compression-ratio screws and polished flow surfaces.
Blow molding of AVE8077P is possible on intermittent or continuous parison lines. The melt temperature at the die head is held between 185 °C and 205 °C, and the blow mold temperature is set at 10–30 °C to freeze the parison quickly and reduce blocking. Because the melt has low elongational viscosity at high moisture content, the parison must be protected from humid air; a curtain of dry air around the die head is sometimes used on production lines. Article thickness must be controlled above 0.4 mm when the container is intended for water-soluble use, because thin areas dissolve too quickly and can breach the wall before the intended release point. Published data for AVE8077P blow-molding trials is limited; start-up conditions are usually established on a small continuous-extrusion blow-molding machine with a 35 mm screw.
When AVE8077P is injection molded, the melt reservoir and injection unit should be kept below 210 °C and the inventory residence time below 20 min. A nozzle temperature of 190–210 °C, mold temperature of 30–50 °C, and injection speed of 20–60 mm/s are typical starting conditions for small water-soluble components. Hot-runner systems with long channels are generally incompatible because the increased residence time and dead volume promote hydrolysis and black specks. After molding, parts are packaged in aluminum-foil or metallized moisture-barrier pouches because absorption of ambient moisture above 60% relative humidity softens the surface and changes part dimensions. The polymer should not be combined with amine-based colorants or strongly alkaline fillers; these additives accelerate chain scission and cause unpredictable melt flow.
Moisture absorption before melt processing converts the resin surface into a low-viscosity lubricant and hydrolyzes the polymer during plastication. Wet resin may appear unchanged but typically causes surging, melt pressure fluctuation, bubbles in extrudate, and reduced tensile strength. The specification limit of 0.20% moisture for extrusion is therefore a process-control boundary rather than a recommendation. In injection molding, wet resin at 0.30% moisture can produce silver streaks and brittle weld lines. The material must be kept in sealed containers and dried immediately before processing; regrind should be limited to 20% by mass and re-dried under the same conditions. When monolayer film is processed at an ambient relative humidity above 60%, the extrudate can absorb water before winding, causing blocking and dimensional growth. In these circumstances, chilled-roll and web-path humidity control to below 40% RH is required, or the film is laminated immediately with moisture-barrier skins.
Thermoforming of coextruded sheet with an AVE8077P core follows standard plug-assist parameters for EVOH sheet. Sheet surface temperature should be 90–110 °C before forming, with the mold at 30–50 °C. The core layer must remain below the moisture level at which the material softens excessively; pre-drying of the sheet to below 0.20% moisture by vacuum or desiccant drying is necessary. If the sheet absorbs moisture during storage, thermoformed parts may show thinning variation and reduced oxygen barrier even when the outer skins are intact. Because the material is hygroscopic, sheet should be formed immediately after drying or stored in sealed barrier packaging until the thermoformer is loaded.
AVE8077P can also function as a water-soluble barrier layer in multilayer flexible packaging or as an interlayer in structures that are later repulped. In combination with polyolefins, the differences in melt viscosity at the die must be managed by adjusting layer temperatures or by using tie resins with melt flow rates between the two materials. The water solubility of AVE8077P makes the structure susceptible to delamination at exposed edges in wet conditions; edge trimming and sealing are therefore required in high-humidity distribution. Unlike typical ethylene-acrylic acid tie layers, AVE8077P does not require amine-free acid copolymers for adhesion because the hydroxyl groups provide polarity; however, adhesion to non-treated polyethylene is poor without corona or plasma treatment. Film-to-film lamination using AVE8077P as a water-dispersible adhesive layer is an emerging application, but quantitative peel strength data for this specific grade is limited.
Qualification of AVE8077P for food-contact, compostability, or industrial use must be confirmed against the current grade-specific compliance certificate. Aerobic biodegradability is commonly assessed under ISO 14855-1:2012 for controlled composting and under ISO 17556:2019 for soil burial; water-soluble polymers can also be evaluated for inherent biodegradability under OECD 301B. Oxygen transmission specimens are conditioned at 23 °C and 0% relative humidity before ASTM D3985-24 or ISO 15105-2 measurement. Density is measured by ISO 1183-1:2019, and tensile properties by ISO 527-2:2012 at 50 mm/min. For food-contact use in the United States, polyvinyl alcohol is the subject of FDA 21 CFR §177.1670, and in the European Union it can be evaluated under Commission Regulation (EU) No 10/2011; the final package must still be tested for overall migration and functional barrier performance. Because AVE8077P is hygroscopic and intended for water-soluble or compostable service, it is incompatible with prolonged contact with liquid water in load-bearing applications unless dissolution is the intended function.
| Property | Test method | Typical condition or target |
|---|---|---|
| Melt mass-flow rate | ISO 1133-1:2022 | 210 °C, 2.16 kg |
| Moisture content before extrusion | ISO 15512:2019 | <0.20% |
| Moisture content before injection molding | ISO 15512:2019 | <0.10% |
| Oxygen transmission | ASTM D3985-24 | 23 °C, 0% RH |
| Tensile properties | ISO 527-2:2012 | 50 mm/min |
| Aerobic biodegradation | ISO 14855-1:2012 | Controlled composting |
