| HS Code | 850364 |
| Product Name | GOHSENOL EG-30P |
| Manufacturer | Mitsubishi Chemical Group (Nippon Gohsei) |
| Chemical Family | Partially hydrolyzed polyvinyl alcohol (PVA) |
| Cas Number | 9002-89-5 |
| Appearance | White to slightly yellow powder |
| Form | Powder |
| Viscosity 4 Percent Solution 20c | 28.0 - 34.0 mPa·s |
| Degree Of Hydrolysis | 86.5 - 89.5 mol% |
| Ph 4 Percent Solution | 5.0 - 7.0 |
| Ash Content | ≤ 0.5 wt% |
| Volatile Content | ≤ 5.0 wt% |
| Bulk Density | 0.4 - 0.6 g/cm³ |
| Solubility | Soluble in hot water; practically insoluble in organic solvents |
As an accredited GOHSENOL EG-30P factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENOL EG-30P is supplied as a white powder in 20 kg multilayer paper bags with polyethylene lining. |
| Container Loading (20′ FCL) | GOHSENOL EG-30P is loaded into a 20-foot full container, palletized in bags, properly secured, ensuring safe, stable transport. |
| Shipping | GOHSENOL EG-30P (polyvinyl alcohol powder) ships as a non-hazardous industrial chemical in sealed multi-layer bags or drums. Protect from moisture, humidity, and direct sunlight during transport. Store in a cool, dry area. Avoid excessive stacking. Standard handling with dust control is required. Shelf life typically one year under proper conditions. |
| Storage | Store GOHSENOL EG-30P in its original, tightly sealed container in a cool, dry, well-ventilated area. Protect from moisture, humidity, and direct sunlight, as the powder can absorb water and clump. Keep away from heat, sparks, and open flames. Avoid stacking near corrosive chemicals. Under proper conditions, shelf life is typically stable for two years from manufacture. |
| Shelf Life | Shelf life is typically 2 years when stored in a cool, dry place in original sealed packaging. |
GOHSENOL EG-30P is a partially saponified polyvinyl alcohol with a saponification degree of 86.5–89.0 mol%, a 4% aqueous solution viscosity of 28.0–32.0 mPa·s at 20 °C, and a maximum ash content of 0.5 wt% as Na2O. The following application scenarios are limited to industrial segments in which this viscosity and hydrolysis band is used in established aqueous processing.
| Application segment | Primary standard/regulation | Relevant test method or condition | Typical PVOH formulation perimeter |
|---|---|---|---|
| VAE latex for wood laminating adhesives | EN 204 | D3/D4 durability class | 2.5–5.0 wt% on vinyl acetate monomer |
| Food-contact paper and board | FDA 21 CFR 176.170 | Component of paper/paperboard | 0.5–2.0 dry parts per 100 dry fiber |
| Remoistenable adhesives | FDA 21 CFR 175.105 | Adhesives with functional barrier | 50–85 wt% of dry polymer solids |
| Textile warp sizing | OEKO-TEX Standard 100 | Annex 4 residual limits | 30–50 wt% of dry size solids |
| Ceramic green binder | REACH registration | Industrial use exposure scenario | 1.0–3.0 wt% on dry ceramic powder |
In semi-batch vinyl acetate-ethylene polymerisation, GOHSENOL EG-30P is pre-dissolved in demineralised water at 20–25 °C to a 10 wt% stock solution and charged into a jacketed stainless pressure reactor equipped with a turbine agitator. The protective colloid loading is 2.5–5.0 wt% based on total vinyl acetate monomer for VAE dispersions with final solids of 55–65 wt%, and 0.5–1.5 wt% for acrylic pressure-sensitive lattices where lower aqueous viscosity is required. The hydrolysis band of 86.5–89.0 mol% supplies sufficient hydroxyl groups for grafting and steric stabilisation at polymerisation temperatures of 70–85 °C, while the residual acetate groups reduce film water sensitivity compared with fully hydrolysed grades.
Polymerisation is operated under an ethylene partial pressure of 2.0–6.0 MPa in a reactor with a height-to-diameter ratio of 1.2–1.8 and a turbine agitator tip speed of 3.0–5.0 m/s. Potassium persulfate and sodium metabisulfite are metered over 180–240 min as separate feeds to avoid local redox depletion. The PVOH feed stream is filtered through a 100 µm cartridge before reactor charging; filter pressure rise above 0.2 MPa indicates undissolved gel specks and requires batch downgrade. Latex final viscosity at 25 °C is controlled by the PVOH-to-monomer ratio, with a shift from 3.0 wt% to 5.0 wt% lifting high-shear viscosity and narrowing particle size distribution. Coagulum is measured on a 150 µm screen; values above 0.2 wt% of wet reactor mass usually correlate with insufficient protective colloid or initiator feed imbalance.
Regulatory compliance for food-contact latex adhesives is evaluated under FDA 21 CFR 175.105; for paper and paperboard coatings under FDA 21 CFR 176.170. In EU food-contact use, the finished article must respect the overall migration limit of 10 mg/dm² under EU Commission Regulation (EU) 10/2011. The powder is subject to REACH registration; downstream users must confirm the specific application within the registration dossier. Terminal products from this segment include D3/D4 wood adhesives under EN 204, paper-to-board laminating adhesives, nonwoven binders, and architectural topcoat binders.
On a metered film-transfer size press running bleached kraft linerboard at 800–1,200 m/min, the binding system is prepared as a co-cooked starch-PVOH solution. GOHSENOL EG-30P is added at 0.5–2.0 dry parts per 100 dry parts of fibre, with a starch-to-PVOH solids ratio between 85:15 and 70:30. The size press bath is held at 55–65 °C, and total size solids are 6.0–12.0 wt%. The PVOH fraction raises surface strength without the brittleness associated with high-dose oxidised starch because the film former distributes across the fibre surface at a wet pick-up of 2.0–4.0 g/m².
In pigment coating, EG-30P is metered as a 10 wt% pre-solution into the coating colour at 0.5–1.5 dry parts per 100 dry parts pigment. The colour is applied on a blade coater at 10–18 g/m² dry coat weight and dried by infrared and air-float dryers at a web surface temperature of 100–120 °C. Water absorption is controlled by ISO 535, surface roughness by ISO 8791-2. The finished products are coated folding boxboard, white-top linerboard, and inkjet receptive fine paper. Cationic wet-end additives should be separated from PVOH at pH below 4.5 because electrostatic precipitation can form deposits on rolls.
For high-twist polyester/cotton spun yarns with twist multipliers above 4.5, the slashing formulation includes total size bath solids at 8.0–12.0 wt%, of which GOHSENOL EG-30P replaces 30–50 wt% of starch solids. The size box on a multi-cylinder slasher is held at 80–90 °C because the co-cooked starch must fully gelatinise; the PVOH stock solution is added after the starch cook to minimise thermal shear on the partially hydrolysed grade. Squeeze roll pressure is adjusted to a dry size pick-up of 8–14 wt% on yarn. Film durability is assessed by the number of warp stops per 100,000 picks on air-jet looms; a size film deficiency is typically detected as increased shed dusting and warp breakage above 3 stops per 100,000 picks.
The woven substrates are twill workwear, automotive seat fabric, and high-density poplin shirting. Desizing after weaving is performed in a washing range at 60–70 °C with non-ionic detergent; the resulting effluent has a high COD-to-BOD ratio because PVOH is water-soluble and biologically slow to degrade. Activated sludge treatment requires a hydraulic retention time sufficient for COD reduction to local discharge limits under EU Urban Waste Water Treatment Directive 91/271/EEC or equivalent national permits. Finished textile chemical residues are checked against OEKO-TEX Standard 100 Annex 4 limits.
Compounding of remoistenable envelope adhesives with GOHSENOL EG-30P is conducted in jacketed stainless mixing vessels at 65–75 °C, using a rotor-stator high-shear mixer for uniform powder wetting. The dry adhesive film contains PVOH at 50–85 wt% of polymer solids, with glycerol or sorbitol humectant at 2.0–5.0 wt% and surfactant at 0.2–0.5 wt%. The finished aqueous adhesive is coated onto envelope flaps at 5–10 g/m² wet film thickness with a roll coater, then dried in a forced-air tunnel at 80–110 °C to a moisture content of 3–6 wt% in the dry gum.
Carton side-seam and paper tube adhesives use lower PVOH fractions of 5–12 wt% of liquid compound in starch or dextrin matrices. The resulting terminal products are remoistenable envelopes, paper labels, paper cores, and carton side-seam seals. Adhesives for dry food packaging are evaluated under FDA 21 CFR 175.105; paper-to-paper bonds under EN 204 D2 durability class may be specified where water resistance is limited. Borax or boric acid addition above 0.3 wt% causes an uncontrolled viscosity increase and gelation with partially saponified PVOH; therefore buffered alkaline formulations require pre-dilution and slow addition under high-shear agitation.
Green bodies pressed from spray-dried alumina granulate containing GOHSENOL EG-30P are evaluated by three-point flexural strength after compaction at 120–180 MPa. The binder is introduced as a 10 wt% aqueous solution into the ceramic slurry at 1.0–3.0 wt% PVOH on dry ceramic powder. Spray drying is operated in a co-current centrifugal atomiser with inlet air at 180–220 °C and outlet air at 70–95 °C; granules are then consolidated on a hydraulic uniaxial press. The debinding profile uses a heating rate of 1–2 K/min to 400–600 °C, followed by a hold at peak temperature to oxidise residual carbon. Green strength measurement follows ASTM C1161-13; if the green body flexural strength is below 0.8 MPa, binder migration during drying or insufficient PVOH concentration is the usual cause.
Because EG-30P carries a maximum ash content of 0.5 wt% as Na2O, the grade is used in oxide ceramics where alkali contamination affects dielectric loss and sintering stability. Production is conducted under ISO 14644-1 cleanroom controls for electronic ceramic powders where particulate contamination is constrained; REACH registration covers the raw material. Terminal products include alumina substrates, piezoceramic elements, and zirconia oxygen sensor bodies. Published data for this specific grade in multilayer capacitor debinding is limited; process qualification at the specified heating ramp is required before high-volume production.
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GOHSENOL EG-30P is a partially hydrolysed polyvinyl alcohol grade supplied by Mitsubishi Chemical Corporation as white to pale-yellow free-flowing granules or powder. The material is identified under CAS 9002-89-5 and is handled as a synthetic water-soluble polymer for aqueous protective-colloid, binder, and surface-treatment operations. When a 4% aqueous solution is prepared at 20°C and tested in accordance with JIS K6726, the nominal viscosity is 27.0–33.0 mPa·s and the degree of hydrolysis is 86.5–89.0 mol%. Aqueous pH at 4% solids is typically 5.0–7.0. Lot-release controls include volatile matter not exceeding 5.0% and ash content not exceeding 0.5% calculated as Na2O. These values are nominal supplier release ranges for the base polymer, not performance specifications of the finished formulation.
| Parameter | Value | Test method |
|---|---|---|
| Degree of hydrolysis | 86.5–89.0 mol% | JIS K6726 |
| Viscosity, 4% aqueous, 20°C | 27.0–33.0 mPa·s | JIS K6726 |
| pH, 4% aqueous | 5.0–7.0 | JIS K6726 |
| Volatile matter | ≤5.0% | JIS K6726 |
| Ash, as Na2O | ≤0.5% | JIS K6726 |
Production-scale preparation is performed by dispersing GOHSENOL EG-30P in ambient water under high-shear agitation, then heating the slurry to 80–90°C for 30–60 min. Direct powder addition to water above 70°C initiates rapid surface gelation and produces translucent fisheye defects that require downstream filtration through 80–100 mesh screens. Rotor-stator mixers, venturi eductors, and side-entry dispersers are preferred over low-shear propeller agitation because powder wetting, lump formation, and air entrainment control final solution clarity. At relative humidity above 60%, the powder absorbs sufficient moisture to affect gravimetric feeding accuracy; pre-drying at 60–80°C for 2–4 h is required before use in continuous dosing systems. Aqueous solutions above 10 wt% are too viscous for routine 0.45 µm membrane filtration and are screened instead through 80–100 mesh in-line strainers before addition to coating or polymerisation vessels.
Compared with other commercial polyvinyl alcohol grades of similar nominal viscosity, GOHSENOL EG-30P is characterised by a controlled hydrolysis window of 86.5–89.0 mol% and controlled ash ≤0.5% as Na2O. Supplier substitution at equal 4% viscosity is not automatically equivalent; degree of hydrolysis, residual methanol, ash, and pH must be rechecked because different saponification and washing processes alter the distribution of acetyl groups and ionic impurities. Rheology alone does not define protective-colloid behaviour in emulsion polymerisation.
In vinyl acetate, acrylic, and vinyl chloride copolymer emulsion polymerisation, GOHSENOL EG-30P functions primarily as a protective colloid rather than as a conventional low-molecular-weight surfactant. The residual acetate groups within the 86.5–89.0 mol% hydrolysis window increase interfacial activity relative to fully hydrolysed grades, while the 27.0–33.0 mPa·s viscosity places the grade between EG-20P and EG-40P in molecular-weight contribution. In batch reactors, the colloid is pre-dissolved at 4–8 wt% in the aqueous phase and charged before monomer addition. Polymerisation temperatures are typically held at 60–80°C for persulfate-initiated vinyl acetate systems, with jacket or reflux cooling controlling the exotherm. The use of EG-30P instead of EG-20P raises the initial aqueous-phase viscosity and increases final latex viscosity at equal colloid loading. Agitator torque at monomer feed start can increase in proportion to the ratio of solution viscosities; mixer motor nameplate capacity and variable-frequency-drive overload settings should be checked before the grade change.
Substitution of EG-30P into an existing EG-20P formulation without reducing colloid solids frequently reduces filterability and raises back-pressure on bag filters. Production-scale batch records indicate that in-line screens of 100 µm can blind when undissolved polymer or reactor-wall coagulum enters the transfer line. Reactor fouling is more pronounced when monomer is starve-fed and local monomer concentration remains low; the higher molecular-weight fraction of EG-30P forms a thicker adsorbed layer on latex particles, improving shear stability but increasing clean-up requirement if the reactor is not rinsed with ambient water immediately after discharge. The viscosity range of 27.0–33.0 mPa·s requires a 5–10% reduction in colloid solids for lots at the upper limit when maintaining the same emulsion viscosity as lots at the lower limit. Lot acceptance should therefore include rotational viscosity at 4% solids, not solely dry-powder moisture or visual appearance.
| Grade | Viscosity, 4% aqueous, 20°C, JIS K6726 | Degree of hydrolysis, JIS K6726 |
|---|---|---|
| EG-20P | 20.0–23.0 mPa·s | 86.5–89.0 mol% |
| EG-30P | 27.0–33.0 mPa·s | 86.5–89.0 mol% |
| EG-40P | 40.0–46.0 mPa·s | 86.5–89.0 mol% |
Among these grades, EG-30P is selected when latex shear stability and carrier viscosity must be higher than EG-20P, but when EG-40P would reduce pumpable solids or increase aqueous make-up volume. Fully hydrolysed GOHSENOL grades with hydrolysis above 98 mol% require hot-water dissolution above 80°C, produce more crystalline films, and give lower water sensitivity; however, they are weaker emulsifying colloids in vinyl acetate polymerisation. The transition between EG-20P, EG-30P, and EG-40P is not linear, so reformulation requires revalidation of emulsion viscosity, coagulum, grit, and freeze-thaw stability because final rheological response depends on particle-size distribution and grafted-PVA formation.
In paper surface sizing and pigment coating, GOHSENOL EG-30P functions as a film-forming binder and oil-and-grease barrier promoter. At equal dry coat weight of 2–4 g/m², a 4% EG-30P size-press solution applied at 50–60°C penetrates more uniformly than a fully hydrolysed grade because the lower crystallinity and partial hydrolysis reduce hot-water demand. However, residual acetate groups make the film more water-sensitive. Cobb60 water absorption measured in accordance with ISO 535:2023 increases relative to fully hydrolysed grades at the same film weight. The substitution is therefore accepted for temporary sizing, label base papers, and paperboard where ink receptivity, surface strength, and runnability are weighted more heavily than water resistance, but is limited for wet-end applications requiring high wet strength or extended water contact.
In pigmented coating formulation, EG-30P is first dissolved at 8–12 wt% and introduced as a post-added binder or co-binder. Shear stability under blade coater conditions at 800–1200 m/min depends on coat weight, pigment particle-size distribution, blade geometry, and backing-roll hardness; published data for this specific configuration is limited, so pilot trials using the intended coating head and drying profile are required. The ash content ≤0.5% as Na2O is low enough for most coated paper and ceramic green-tape applications, but sodium-sensitive electronic-ceramic suspensions may require lot-specific ash certificates.
Textile slashing of spun polyester-cotton yarns commonly uses 6–10 wt% aqueous EG-30P in a size box maintained at 60–70°C. Squeeze-roll pressures, drying-cylinder profiles, and yarn moisture targets are machine-specific; no universal parameters apply. EG-30P is later removed by enzymatic or oxidative desizing, and the selection of desizing conditions is affected by the degree of hydrolysis because higher acetate content increases cold-water removal but lowers film toughness. High-temperature calendering should be validated for roll contamination because partially hydrolysed film may soften and transfer under heat and pressure.
Ceramic tape casting uses aqueous EG-30P binder at 3–6 wt% in slurry solids; lot ash content and viscosity control thickness uniformity. Substitution from EG-20P to EG-30P increases slurry viscosity and may require adjustment of solvent-water ratio and defoaming. Tape-casting lines using slot-die coaters at 0.5–2.0 m/min require vacuum degassing of the slurry before coating; residual dissolved air forms pinholes that reduce green density. Published data for specific alumina or barium titanate tape formulations with EG-30P is limited, so green-body density and binder burnout must be revalidated under the target firing schedule.
Water-soluble film and mould-release coating formulations containing EG-30P are plasticised with glycerol or low-molecular-weight polyethylene glycol at 10–20 phr. Cast film dried at 60–80°C retains a nominal equilibrium moisture of 3–5 wt% at 50% RH; lower humidity induces embrittlement, while higher humidity causes blocking. Slitting and packaging of EG-30P-based cast film are therefore specified at 40–60% RH and 15–25°C. Dissolution-rate performance in cold-water detergent pouches is formulation-dependent; published data for this specific configuration is limited, so a 1 L stirred cell at 200 rpm is recommended as a screening tool before commercialisation.
Regulatory status is application-specific. In indirect food-contact adhesives and paper coatings, GOHSENOL EG-30P may be assessed under FDA 21 CFR 175.105, 176.170, and 176.180, provided the finished article meets the applicable extractive limitations for the intended food type and use condition. For EU food-contact articles, overall migration testing under Regulation (EU) 10/2011 or national legislation must be completed; polyvinyl alcohol is not universally listed for all plastic food-contact layers, and functional-barrier justification may be required. The polymer benefits from the REACH polymer exemption under Article 2(9), subject to the registration status of its constituent monomers. RoHS heavy-metal compliance must not be assumed from a standard PVA lot certificate unless X-ray fluorescence or ICP-MS screening for lead, cadmium, mercury, and hexavalent chromium is specifically ordered.
Storage containers should remain closed when not in use and be protected from moisture, direct sunlight, and open flames. PVA dust can form explosive mixtures in air; transfer systems should be grounded and equipped with dust collectors. Avoid contact with borates, strong acids, strong oxidising agents, and multivalent metal salts that can produce gelation or precipitation. Lot acceptance should include rotational viscosity at 4% solids, pH, and visual solution clarity after 30 min at 85°C; any lot outside 27.0–33.0 mPa·s should be segregated pending reformulation because downstream metering and film thickness are directly affected.
