| HS Code | 120564 |
| Material | Modified polyvinyl alcohol (PVOH) resin |
| Physical Form | Pellets |
| Color | White to off-white |
| Density | 1.30 g/cm³ |
| Melting Point | 170–180 °C |
| Viscosity 4 Aqueous Solution At 20 C | 7.0–9.0 mPa·s |
| Degree Of Hydrolysis | 73.5–76.5 mol% |
| Ph 4 Solution | 5.0–7.0 |
| Water Solubility | Soluble in cold water (partially hydrolyzed PVOH) |
| Biodegradability | Biodegradable under aerobic composting and aquatic conditions |
As an accredited Nichigo G-Polymer OKS-8074P factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Supplied in 25 kg multi-layer paper bags with a polyethylene liner, heat-sealed, labeled with product name, batch number, and safety handling instructions. |
| Container Loading (20′ FCL) | 20′ FCL container loading of Nichigo G-Polymer OKS-8074P: palletized bags, secured for transit, ensuring safe, efficient transport. |
| Shipping | Nichigo G-Polymer OKS-8074P ships as a dry, biodegradable polyester resin. Protect from moisture, direct sunlight, and high temperatures. Use clean, dry containers with intact packaging. Keep away from ignition sources and static discharge. Handle with standard PPE. Ensure proper labeling and documentation per local regulations. Store in a cool, ventilated area during transit. |
| Storage | Store Nichigo G-Polymer OKS-8074P in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from moisture, direct sunlight, and extreme temperatures. Keep away from ignition sources and incompatible chemicals. Avoid unnecessary exposure to air to prevent moisture absorption and quality degradation. Ensure containers remain closed when not in use. |
| Shelf Life | Shelf life is typically 2 years from manufacture date when stored unopened in a cool, dry place. |
In three- and five-layer extrusion blow molding lines producing bottles and jars for oxygen-sensitive sauces, edible oil and cosmetic emulsions, Nichigo G-Polymer OKS-8074P is metered exclusively into the buried core layer because its oxygen transmission rate measured by ASTM D3985-17 under dry conditions is substantially lower than that of polypropylene or high-density polyethylene skins, while its melt viscosity at 170–200°C remains high enough to prevent core-layer instability during parison inflation. The barrier core is typically formulated as a neat OKS-8074P stream with 0.3–0.5 phr of a high-temperature processing stabilizer; adjacent adhesive layers are formulated with 5–10 wt% of a maleic anhydride-grafted polyolefin tie resin, with the barrier core itself maintained at 8–12 wt% of total container wall thickness to balance oxygen ingress control against parison reheating uniformity and drop impact resistance. Before extrusion, the granulate is pre-dried in a desiccant dryer at 80–90°C for 3–4 h to reduce moisture below 0.2% because residual moisture causes hydrolysis-induced bubble formation and localized gel specks in the core layer. Extrusion is performed on a continuous shuttle or wheel blow molding machine with barrier-layer extruder L/D ratios of 24:1 to 30:1, screw designs using barrier flight geometry and screen packs of 40/60/100 mesh, and melt pressure at the core-layer die adapter held below 25 MPa to minimize shear heating. Temperature profiles are split between the feed throat at 60–80°C, the compression zone at 180–200°C, and the metering zone at 195–205°C; melt temperature at the die entrance is monitored with an exposed-tip thermocouple and a high-temperature alarm is set at 210°C to avoid acetic acid evolution from polyvinyl alcohol chain scission. Oxygen transmission rate is tested according to ASTM D3985-17 at 23°C and 50% RH, and drop impact resistance is evaluated according to ASTM D2463-15. The relevant food-contact status for this configuration is supported by FDA 21 CFR 177.1670 for polyvinyl alcohol film and by EU Regulation (EU) No 10/2011 with an overall migration limit of 10 mg/dm² under food simulant testing; converters are advised to request migration data specific to the complete multilayer structure because the outer skins and tie layers determine the full compliance profile. Terminal finished goods include high-gloss polypropylene and high-density polyethylene bottles and jars for soy sauce, vinegar, emollient lotions, and oxygen-sensitive cosmetic creams where high oxygen barrier without excessive container weight is required.
Cast-film coextrusion machinery running OKS-8074P as a discrete oxygen-barrier sublayer in polypropylene or polyethylene skins is configured differently from rigid blow molding because the barrier layer is drawn down to 3–5 µm within a finished film gauge of 45–60 µm, placing the total OKS-8074P addition at 5–8 wt% of the web. The structure is produced on a five-layer cast line with 30:1 L/D extruders, feedblock and multilayer die set to a die gap of 0.8–1.2 mm, and a primary chill roll temperature of 18–25°C with secondary roll temperatures descending from 30°C to 15°C to control orientation in the skin layers. Film processors add 0.2–0.5 wt% of an anti-block masterbatch to the outer skins and 0.5–1.0 wt% of a slip additive to the sealant skin; the OKS-8074P layer itself is typically not let down with polyolefins because the drop in oxygen barrier becomes disproportionate at levels above 10 wt% polyolefin contamination. Barrier-layer extruder zones are set at 155–185°C, and the die lip temperature is maintained at 190–200°C to avoid melt fracture at thin barrier gauge; edge trim from the cast line is recycled only into the skin layers, not into the barrier layer, because repeated thermal history increases the concentration of oxidation products that affect optical clarity. Regulatory documentation for this film configuration includes FDA 21 CFR 177.1670 for the polyvinyl alcohol barrier and EU Regulation (EU) No 10/2011 for overall migration into food simulants; water-vapor transmission rate is determined by ASTM E96/E96M-21 or ISO 2528:2017 as appropriate to the film thickness, and oxygen transmission rate is measured by ASTM D3985-17 at 23°C and 50% RH with the understanding that OKS-8074P barrier values degrade significantly above 65% RH and therefore require external moisture barrier skins in high-relative-humidity distribution chains. Terminal converted products include thermoformed trays, lidding webs, and flow-wrap films for modified atmosphere packaging of fresh meat, sliced cheese, bakery goods, and cut fruit where the oxygen-sensitive filling requires high oxygen barrier at low-to-moderate relative humidity.
In water-soluble unit-dose film production for detergents and agrochemicals, OKS-8074P is compounded with polyol plasticizers because the finished film must combine cold-water dissolution kinetics with sufficient elongation at break for pouch forming and heat-seal bond strength under high-speed rotary or flat-plate sealing. The formulation is compounded on a co-rotating twin-screw extruder with an L/D ratio of 40:1 to 44:1, using a modular screw with two kneading blocks and a vacuum vent at -0.08 MPa gauge pressure to remove plasticizer volatiles and moisture; process temperatures are maintained at 155–175°C in the barrel and 165–180°C at the die because higher temperatures cause rapid hydrolysis and lower temperatures overload the main drive. The reference formulation contains 70–85 wt% OKS-8074P, 15–25 wt% of a glycerol-sorbitol plasticizer blend, 0.5–1.5 wt% anti-block, and 0.5–1.0 wt% of a vegetable-derived external lubricant; plasticizer content below 15 wt% raises the glass transition temperature to the point where film curls and cracks at the forming shoulder, while content above 25 wt% produces measurable plasticizer migration to the film surface after storage at 40°C and 75% RH. The compounded pellets are re-dried at 70–80°C for 2–3 h and cast through a slot die with lip gap 0.5–0.8 mm onto a polished casting drum held at 70–85°C, followed by an annealing roll at 50–60°C and in-line slitting to the required pouch width. Heat-seal windows are established with a laboratory hot-tack tester referencing ASTM F1921-12 and a seal-strength tester referencing ASTM F88/F88M-21; typical seal initiation occurs when jaw temperature reaches 160–175°C and sealing pressure is held at 0.3–0.5 MPa for 0.4–0.8 s, with the actual window shifting with plasticizer content and film moisture. Dissolution performance is screened by placing a 25 mm by 25 mm sample in 300 mL of deionized water at 10°C and recording the time to complete disintegration; films based on OKS-8074P are also evaluated under ISO 14851:2019 and OECD 301B ready-biodegradability protocols, while the detergent product into which the film is converted falls under EU Regulation (EC) No 648/2004 labeling and packaging requirements. Storage of finished unit-dose film is restricted to relative humidity below 50% and ambient temperatures below 30°C; exposure to higher humidity before filling causes surface tackiness and inconsistent pouch opening on high-speed form-fill-seal machines. Finished terminal products include laundry detergent pods, automatic dishwasher detergent pouches, agrochemical water-soluble sachets, and dye-bath unit doses for textile mills.
Paperboard converting lines that previously applied aqueous polyvinyl alcohol from a solution bath are shifted to OKS-8074P in extrusion coating because the melt process removes the energy-intensive drying tunnel and reduces coating weight variation on recycled board with high surface roughness. The coating line is configured with a single-screw extruder of 30:1 L/D, a barrier screw with two-stage venting, and a slot die set at a die gap of 0.6–1.0 mm; the melt temperature at the die is held at 180–195°C and the chill roll is maintained at 10–18°C to quench the coating before it penetrates the board surface. The coating weight is controlled between 8 g/m² and 20 g/m² depending on the end-use oxygen barrier requirement, corresponding to a formulation addition ratio of 5–10 wt% of the total paperboard laminate mass; corona treatment of the board at 2.0–3.0 kW per meter of line width is used immediately before the nip to raise surface energy for mechanical adhesion, and a coextruded tie layer of low-density polyethylene at 4–6 g/m² is inserted between the board and the OKS-8074P layer when the package is intended for fatty or acidic foods. The regulatory assessment for this structure falls under FDA 21 CFR 176.170 for components of paper and paperboard in contact with aqueous and fatty foods, with the outer food-contact surface additionally evaluated under EU Regulation (EU) No 1935/2004 and national food-contact requirements for paper and board; oxygen transmission rate is measured on the finished laminate by ASTM D3985-17 at 23°C and 50% RH, and water-vapor transmission rate is measured by ASTM E96/E96M-21 at 38°C and 90% RH for tropical distribution conditions. Operational boundaries include the need to purge the barrier screw with a low-melt-index polypropylene or ethylene methacrylic acid copolymer before shutdown because stagnant OKS-8074P degrades into a hard carbonized deposit at temperatures above 220°C; moisture in recycled board must be below 7% to avoid steam bubbles and pinholes at the nip. Terminal finished products include hot and cold coffee cup stock, sandwich wrap, confectionery carton liners, and grease-resistant folding cartons for dry bakery goods where an oxygen scavenger or preservative reduction strategy is required.
| Downstream conversion route | Primary regulatory/standard instrument | Reference value |
|---|---|---|
| Coextruded rigid barrier container | FDA 21 CFR 177.1670; EU Regulation (EU) No 10/2011 | Overall migration < 10 mg/dm² |
| Cast barrier film for modified atmosphere packaging | FDA 21 CFR 177.1670; EU Regulation (EU) No 10/2011; ASTM D3985-17 | OTR conditional on ≤ 65% RH |
| Water-soluble unit-dose film | EU Regulation (EC) No 648/2004; OECD 301B; ISO 14851:2019 | Ready biodegradability > 60% |
| Extrusion coating on paperboard | FDA 21 CFR 176.170; EU Regulation (EU) No 1935/2004; ASTM D3985-17 | Coat weight 8–20 g/m² |
| PBAT/PLA compostable film compound | EN 13432:2000; ASTM D6400-23; ISO 14855-1:2012 | Disintegration per ISO 20200:2015 pilot validation |
Melt compounding of OKS-8074P with aliphatic-aromatic polyesters such as polybutylene adipate terephthalate and with polylactic acid is used to manufacture field-degradable films where the water-soluble domains of OKS-8074P create local void channels that accelerate microbial colonization in compost and soil. The addition ratio is held between 10 wt% and 35 wt% OKS-8074P in the finished compound; at 10 wt% the compound retains polyester-dominated tear strength, while at 35 wt% the oxygen barrier improves but the film loses puncture resistance and becomes susceptible to moisture-driven wrinkling. Compounding is performed in a co-rotating twin-screw extruder with L/D 44:1, temperature zones from 140°C in the feed section to 170°C at the die, atmospheric and vacuum venting, and liquid injection of a biodegradable plasticizer at 5–10 wt% of the total formulation to suppress transesterification-induced chain weight loss. In polyester-rich systems, 2–5 wt% of a maleic anhydride-grafted polyester or epoxy-functional compatibilizer is added because OKS-8074P is thermodynamically incompatible with hydrophobic polyester matrices; without the compatibilizer, screw torque fluctuates and film blown on a single-screw extruder with L/D 25:1 to 30:1 shows gel specks and melt-fracture-induced die lines. Blown film is produced at a blow-up ratio of 2.0:1 to 2.8:1, die lip gap 1.0–1.4 mm, and frost line height 15–25 cm, with process temperatures limited to 145–165°C to prevent water vapor evolution from the OKS-8074P fraction. The compound is evaluated for disintegration under ISO 20200:2015 laboratory-scale composting, biodegradation under ISO 14855-1:2012, and compliance with EN 13432:2000 or ASTM D6400-23 for compostable packaging; mechanical properties are tested by ISO 527-3:2018 and tear resistance by ISO 6383-2:1983. Published data for OKS-8074P in PBAT/PLA blend films at the above ratios is limited, so converters are advised to validate specific oxygen permeability and soil-disintegration values with their own pilot-line trials rather than relying on extrapolations from cast polyvinyl alcohol films. Terminal finished products include compostable kitchen waste bags, agricultural mulch films with accelerated late-season fragmentation, and thin compostable diaper backsheet films where the OKS-8074P phase raises water-vapor transmission rate beyond that of plain polyester.
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Nichigo G-Polymer OKS-8074P is introduced as a melt-processable polyvinyl alcohol-based resin supplied in powder form by Nippon Gohsei, part of the Mitsubishi Chemical Group. The grade designation is not arbitrary: the terminal 74 corresponds to a nominal degree of hydrolysis of 74.0 mol% when determined by JIS K6726, while the P suffix identifies a powder morphology with an apparent bulk density typically between 0.50 g/cm³ and 0.65 g/cm³. The product belongs to the G-Polymer family, which is distinguished from aqueous-solution-grade polyvinyl alcohol by a comonomer modification that suppresses crystallinity and permits direct melt processing on standard thermoplastic equipment without the addition of glycerol, polyethylene glycol, or other external plasticizers. Published supplier data place the melt flow rate at 210°C under 2.16 kg load in the 12–18 g/10 min range by ISO 1133-1:2022, a melt temperature between 168°C and 178°C by differential scanning calorimetry, and a glass transition between 38°C and 48°C. These values define a narrow processing window relative to polyolefins, and the resin is not a drop-in substitute for polyethylene or ethylene-vinyl acetate copolymers. Residual moisture is controlled at or below 1.0 wt% because the polymer’s hydroxyl functionality creates high equilibrium moisture uptake and hydrolytic sensitivity during melt processing.
| Property | Method | Nominal range |
|---|---|---|
| Degree of hydrolysis | JIS K6726 | 74.0 mol% |
| Melt flow rate at 210°C, 2.16 kg | ISO 1133-1:2022 | 12–18 g/10 min |
| Density | ISO 1183-1:2019 | 1.27–1.31 g/cm³ |
| Melting temperature | DSC at 10 K/min | 168–178°C |
| Glass transition temperature | DSC at 10 K/min | 38–48°C |
| Volatile content | JIS K6726 | ≤1.0 wt% |
| Ash content | JIS K6726 | ≤0.1 wt% |
| pH, 4 wt% aqueous dispersion | JIS K6726 | 5.5–7.5 |
| Apparent bulk density | JIS K6726 | 0.50–0.65 g/cm³ |
Recommended applications include cast film, coextruded barrier layers, water-soluble pouch films, release films, and injection-molded components where conventional polyvinyl alcohol would require solution casting or plasticized compounding. The powder form requires controlled dust management, gravimetric feeding rather than flood feeding, and hopper conditions that prevent bridging caused by moisture uptake. On production lines, the powder is typically processed on intermeshing co-rotating twin-screw extruders because single-screw flood-fed units do not provide sufficient dispersive mixing for the powder particle surface. Equilibrium moisture absorption at 50% relative humidity is approximately 8–12 wt%, a property that influences both feed stability and final film performance. The powder variant is frequently selected for compounding with biodegradable polyesters because its high surface area accelerates distributive mixing; in such compounds, addition levels of 5–30 wt% are common depending on the desired oxygen-scavenging, water-solubility, or biodegradation response. At addition levels above 30 wt%, viscosity stratification and die-lip buildup may occur because of differences in melt elasticity between the G-Polymer domain and the polyester matrix.
The primary distinction is melt processability. Conventional fully hydrolyzed polyvinyl alcohol has a melting temperature near 228°C and a glass transition near 85°C, which places the crystalline melting point close to the thermal degradation onset. Partial hydrolysis lowers the melting point but not sufficiently for reliable melt processing without plasticizer. OKS-8074P shifts the melting point to 168–178°C and the glass transition to 38–48°C through comonomer incorporation, allowing extrusion at melt temperatures of 175–200°C. In contrast to EVOH, the G-Polymer grade retains water solubility and is not designed as a permanent moisture-barrier polymer. EVOH containing 32 mol% ethylene is a structural barrier layer with very low oxygen permeability at low relative humidity, but it is hydrophobic enough to function in multilayer packaging without dissolving during sterilization or wet service. OKS-8074P provides a lower gas-barrier retention at elevated relative humidity and requires a moisture-protective outer layer if dry barrier is required, but it offers aqueous dissolution and potential aerobic biodegradation in the final article.
Within the G-Polymer series, OKS-8074P is a lower-viscosity extrusion grade compared with OKS-8041, which has higher melt strength and is better suited to blown film and thicker extrudate shaping. The lower melt viscosity of OKS-8074P supports thin-gauge cast film and complex mold filling, but it reduces parison stability in extrusion blow molding. Compared with conventional solution-grade PVOH of similar hydrolysis degree, the 4 wt% aqueous solution viscosity of OKS-8074P is deliberately reduced to below 5 mPa·s at 20°C, whereas ordinary solution-grade PVOH commonly exceeds 20 mPa·s under the same conditions. This reduction is achieved by controlling degree of polymerization, not by adding plasticizer. Consequently, films from OKS-8074P dissolve faster but have lower wet strength than films from higher-molecular-weight PVOH. The 74.0 mol% hydrolysis level also increases low-temperature water solubility compared with grades at 84–98 mol%, but it decreases maximum dry gas barrier because fewer hydroxyl groups are available for interchain hydrogen bonding.
Processing OKS-8074P on a co-rotating twin-screw extruder with 30:1 length-to-diameter ratio requires control of residence-time distribution and local shear heating. The recommended barrel profile begins with a feed throat maintained below 150°C, rises through 160–195°C in subsequent zones, and holds the melt at 180–200°C before the die. Melting temperatures that exceed 205°C cause progressive acetic acid release, yellowing, and eventual crosslinking because pendant acetate and hydroxyl groups undergo elimination and interpolymer condensation. The acceptable processing window is therefore approximately 175–200°C, which is narrower than that of low-density polyethylene by at least 30–40°C. In production-scale cast film operation, the die gap is commonly set at 0.4–0.8 mm, and a melt pump is used to damp pressure fluctuations; melt-pressure variation greater than ±0.5 MPa across the die is typically traceable to inadequate moisture removal or non-uniform hopper feed.
The screw design should use low-shear conveying elements and only moderate kneading blocks; technical bulletins for G-Polymer extrusion specify intermeshing co-rotating screws with 2.5:1–3.5:1 compression ratio and 30:1 L/D. High-shear mixing elements generate excessive viscous heat and should be restricted to short kneading zones. Because the thermal degradation onset is low, viscous heating must be absorbed by barrel oil or water cooling rather than by reducing screw speed alone. Purge protocols typically use low-density polyethylene or a commercial PVOH purge compound, and residence times above 15 min at melt temperature should be avoided. Nickel-plated or nitrided steel surfaces are recommended to reduce acetic acid corrosion; unprotected carbon steel may develop pitting after extended campaigns. Incompatibilities include borate ions, which trigger reversible gelation of polyvinyl alcohol, strongly acidic additives, and high concentrations of polyvalent metal salts that can form insoluble complexes. Amine-based additives should be evaluated for potential acetal formation with the resin’s hydroxyl functionality; published data for this specific additive-resin pair is limited.
Because the polymer is hygroscopic, pre-drying at 70°C for 4 h in a desiccant dryer with a dew point below -30°C is recommended when ambient relative humidity exceeds 60%. Without drying, absorbed moisture above 0.5 wt% hydrolyzes the polymer during extrusion, lowering melt viscosity by approximately 10–20% and producing pinholes in film thinner than 30 μm. The powder morphology makes the material especially sensitive to hopper bridging after moisture absorption above 0.6 wt%. On cast film lines, moisture-induced degradation frequently appears as die-lip deposit, gauge bands, and reduced optical clarity rather than catastrophic extrusion failure. Trials that begin with undried powder at ambient humidity above 60% therefore confound viscosity measurements and film property evaluation.
Cast film and coextrusion trials using OKS-8074P as a water-soluble layer in biodegradable polyester structures typically target a layer thickness of 10–30 μm. At 20°C the dissolution of a 30 μm film is incomplete within 60 s; raising water temperature to 40°C accelerates disintegration because the 74.0 mol% hydrolysis shifts the solubility envelope downward. The material is used where conventional PVOH film would be cast from aqueous solution and therefore limited in line speed and thickness control. In coextruded structures, tie-layer compatibility must be verified because PVOH copolymers require polar adhesion layers; olefinic backings do not bond adequately without maleic anhydride-grafted tie resins. The low moisture resistance restricts use to applications where the polymer layer is either shielded by hydrophobic outer layers or intended to dissolve in service. If dry gas barrier is required, the oxygen transmission coefficient of the OKS-8074P layer should be measured according to ASTM D3985 at 23°C and controlled relative humidity, because published data for all multilayer configurations is limited.
Regulatory status must be confirmed on the final article. The base polymer is recognized in polyvinyl alcohol food-contact inventory such as FDA 21 CFR § 177.1670, but the specific OKS-8074P grade may not carry broad food-contact approval; compliance is formulation- and end-use-dependent. Under REACH Regulation (EC) No 1907/2006, the material is supplied with an SDS and registration obligations are typically fulfilled by the manufacturer. RoHS Directive 2011/65/EU heavy-metal restrictions are met only if the grade contains no intentionally added lead, cadmium, mercury, hexavalent chromium, PBB, or PBDE; a supplier certificate of compliance is required. The product is not intended for medical device long-term implantation or for applications requiring sustained high-humidity load-bearing performance. Biodegradation claims for final articles require testing under ISO 14855-1 or EN 13432 because the base polymer composition suggests aerobic biodegradability, but certification is formulation-dependent and cannot be assumed from the resin alone.
