| HS Code | 688558 |
| Product Name | GOHSENOL EG-03P |
| Manufacturer | Mitsubishi Chemical Corporation |
| Chemical Family | Polyvinyl alcohol (PVA) |
| Appearance | White to pale yellow granular powder |
| Form | Powder |
| Viscosity 4 Percent Solution At 20c | 3.0 - 4.0 mPa·s |
| Degree Of Saponification | 86.5 - 89.0 mol% |
| Ph 4 Percent Solution | 5.0 - 7.0 |
| Ash Content | ≤ 0.5 wt% |
| Volatile Matter | ≤ 5.0 wt% |
| Solubility | Soluble in water; insoluble in most organic solvents |
As an accredited GOHSENOL EG-03P factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENOL EG-03P is a white granular polyvinyl alcohol, supplied in 25 kg multilayer paper bags for safe handling. |
| Container Loading (20′ FCL) | GOHSENOL EG-03P loaded as 20′ FCL, secured with proper dunnage, ensuring safe transport and moisture protection. |
| Shipping | GOHSENOL EG-03P (polyvinyl alcohol) ships as a non-hazardous, water-soluble polymer powder. Pack in sealed, moisture-proof bags or drums to prevent clumping. Avoid dust generation; store in cool, dry area. Standard dry cargo transport is acceptable, with protection from humidity and direct heat during transit. |
| Storage | Store GOHSENOL EG-03P in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep the container tightly sealed to prevent moisture absorption and contamination. Avoid generating dust, and separate from incompatible materials such as strong oxidizers. Ensure clear labeling and controlled access for proper inventory management. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored unopened in a cool, dry place. |
GOHSENOL EG-03P is a partially saponified polyvinyl alcohol with a degree of hydrolysis of 86.0–89.0 mol% and a 4% aqueous solution viscosity of 3.0–3.5 mPa·s at 20°C when measured according to JIS K6726. In vinyl acetate-ethylene and vinyl acetate-acrylic emulsion polymerisation, the grade is charged as a secondary protective colloid rather than as the sole stabiliser. Aqueous stock solutions at 15–20 wt% solids are prepared in insulated dissolution vessels with high-shear dispersers at 90–95°C for 45–60 min; the solution is then cooled to 30–40°C before monomer addition to avoid localised thermal grafting. In a jacketed stainless steel or glass-lined reactor equipped with dual pitched impellers operating at 60–100 rpm, the EG-03P addition window is 4–8 wt% based on total monomer. Below 2 wt%, steric stabilisation is insufficient and coagulum accumulates on 150 µm outlet screens. Above 12 wt%, latex viscosity measured with a Brookfield RVT spindle 3 at 20 rpm and 25°C can exceed 5000 mPa·s, causing shear instability in heat exchangers and filter blinding. The residual acetyl content of 11–14 mol% reduces crystallinity, maintains cold-water solubility, and increases interfacial activity at the vinyl acetate monomer droplet boundary. During polymerisation at 55–75°C with a persulfate-bisulfite redox initiation system, radical transfer to the PVA backbone generates grafted PVA chains that alter latex particle size distribution. Laser diffraction typically shows a D50 shift from 0.8 µm to 2.5 µm as EG-03P increases within the working window. Final latexes are used for nonwoven binders, laminating adhesives, and construction sealant compounding. Mechanical shear stability of the finished latex should be checked by ASTM D1076 and film tensile by ASTM D638-14; published data for this specific EG-03P configuration in commercial reactors is limited, so pilot-scale coagulum and heat-age tests are required before full substitution.
High-speed envelope and label converting lines use GOHSENOL EG-03P in remoistenable adhesive premixes because the low-viscosity profile permits dry application weights from 2 g/m² to 8 g/m² without roller skinning. A typical premix contains 18–25 wt% PVA solids, plasticiser at 10–30 phr on PVA, defoamer at 0.05–0.2 wt%, and a preservative for waterborne storage. Brookfield viscosity at 30°C is maintained at 500–1500 mPa·s using spindle 3 at 20 rpm; this range prevents fibre tear during kiss coating and avoids stringing at higher machine speeds. Hot-air tunnel drying is set at 80–110°C, but paper web surface temperature should remain below 45°C on 40 g/m² stock to minimise curl and blocking. Remoistenable tack is tested after applying 15 g/m² water and peeling according to ASTM D903. Blocking resistance is assessed at 40°C and 60% RH for 24 h. For food-contact converting, the dried adhesive film falls under FDA 21 CFR 175.105 for indirect contact; where the gummed paperboard itself contacts dry food, FDA 21 CFR 176.170 applies. End products include gummed envelopes, label stocks, and packaging converters where remoistenable adhesion must survive high-humidity storage without pre-gelling.
In a multi-cylinder slasher with 9–13 drying cans, GOHSENOL EG-03P is cooked at 90–95°C for 30 min in a jet cooker and then held in the size box at 80–85°C. The size formulation for a 65/35 polyester-cotton 20s Ne warp typically contains 6–12 wt% EG-03P, optionally blended with 3–8 wt% oxidized corn starch or acrylic size to reduce size cost. Slasher box viscosity is controlled at 40–120 mPa·s at 85°C using a rotating spindle viscometer with spindle 2 at 30 rpm; this window is low enough for intra-yarn penetration but high enough to avoid excessive shedding. Squeeze mangle pressure is set at 2.0–3.5 bar to give a size add-on of 8–14% dry weight. PVA film from this hydrolysis band typically exhibits dry film tensile of 40–60 MPa under ASTM D882; published data for EG-03P in sized-yarn tensile retention is limited, so mill trials using ASTM D2256 are required for each yarn style. Desizing is performed in an open-width washer at 85°C with 0.5–1.0 g/L non-ionic wetting agent; starch blends may additionally require amylase. An operational boundary is 85% RH in loom rooms, above which the PVA size film softens and shed stickiness increases. End products include dress shirting, workwear, and blended woven fabrics where low residual size and clean desizing are critical.
Spray-drying a vinyl acetate-ethylene dispersion stabilised with GOHSENOL EG-03P produces a redispersible polymer powder for cementitious dry-mix formulations. The feed dispersion contains 45–55 wt% solids, and EG-03P is present at 5–15 wt% of dispersion solids as protective colloid. A rotary atomiser operated at 12000–16000 rpm with inlet air at 130–170°C and outlet air at 65–85°C is typical; outlet temperatures above 85°C reduce redispersibility after wetting and can embrittle the powder. Anti-caking agent, usually kaolin or dolomite at 5–15 wt%, is metered into the cyclone discharge to maintain free flow. The resulting powder is blended into dry-mix tile adhesives at 1.5–4.5 wt%, and the cured mortar must meet EN 12004-2 shear adhesion thresholds of ≥0.5 N/mm² for C1 and ≥1.0 N/mm² for C2 after water immersion. Because EG-03P is a low-viscosity grade, its film strength contribution in mortar is lower than that of high-DP protective colloids; published data for this specific EG-03P configuration in commercial dry-mix formulations is limited, and each cement-sand blend requires revalidation of open time, wet adhesion, and powder redispersibility. End products include C1 and C2 tile adhesives, self-leveling underlayments, and repair mortars.
Ceramic green-body binders based on GOHSENOL EG-03P require separate burnout and slurry rheology validation because low-viscosity grades alter granule density and debinding exit temperature. For alumina or zirconia spray granulation, the aqueous binder is dosed at 1–3 wt% on dry ceramic solids in slips containing 45–55 vol% solids. Slurry viscosity is typically maintained at 80–150 mPa·s at 25°C using spindle 2 at 30 rpm. A spray dryer with inlet temperature 90–150°C and outlet temperature 55–75°C yields granules with D50 of 60–120 µm. Burnout is conducted at 1–2°C/min to 350–500°C with a 2 h hold; residual ash must remain below 0.5 wt% after 700°C ignition under JIS K6726. Higher ash levels degrade dielectric loss tangent in electronic substrates and multilayer ceramic capacitors. The lower solution viscosity of EG-03P supports higher spray-dried granule density than high-viscosity PVA grades, but it also reduces green body fracture strength unless binder dosage is increased or plasticiser is added. End products include pressed ceramic bodies, tape-cast substrates, and spray-dried press granules where binder migration and burnout residue directly affect kiln yield.
When the starch-to-PVA ratio in a puddle-type size press falls below 4:1, GOHSENOL EG-03P addition changes Cobb 60 water absorption and surface strength on board and liner stock. Size-press sizing uses 1–4 wt% EG-03P solution, commonly blended with octenyl succinate starch or hydroxyethyl starch at 8–12% total size solids. Size press temperature is held at 50–65°C, nip pressure at 40–60 kN/m, and dry pick-up at 0.5–2.0 g/m². Under ISO 535, Cobb 60 values typically decrease from 80 g/m² to 30 g/m² as EG-03P replaces starch below the 4:1 starch-to-PVA ratio; excessively low Cobb values can reduce aqueous adhesive penetration in downstream converting, so reel moisture and surface energy should be monitored. Food-contact board sizing falls under FDA 21 CFR 176.170 for paper and paperboard components. The low solution viscosity of EG-03P permits stable size-press operation at high machine speeds without rod-puddle frothing. End products include folding cartons, linerboard, and coated recycled board where surface strength, lint resistance, and regulated water absorption are specified by converters.
| Application zone | Standard or regulation | Test designation | Operational boundary |
|---|---|---|---|
| Emulsion polymerisation | JIS K6726 | 4% aqueous viscosity at 20°C | 3.0–3.5 mPa·s |
| Remoistenable adhesive | FDA 21 CFR 175.105 | Indirect food-contact migration | Dry food contact unless barrier formed |
| Textile warp sizing | ASTM D2256 | Yarn tensile retention | Loom room RH below 85% |
| Redispersible powder | EN 12004-2 | C1/C2 adhesion after water immersion | Spray dryer outlet below 85°C |
| Ceramic burnout | JIS K6726 | Ash after 700°C ignition | Ash below 0.5 wt% |
| Paper surface sizing | ISO 535 | Cobb 60 water absorption | 30–80 g/m² |
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GOHSENOL EG-03P is a low-viscosity, partially saponified polyvinyl alcohol resin supplied as a white powder under the GOHSENOL brand of Mitsubishi Chemical Corporation. Typical release specifications include a degree of hydrolysis of 86.5–89.0 mol% and a viscosity of 3.2–3.8 mPa·s measured on a 4% aqueous solution at 20°C according to JIS K6726. The low molecular weight and residual acetate content produce a cold-water-soluble film former that can be dissolved without a high-temperature cook stage, provided sufficient mechanical shear is available. Primary applications include emulsion polymerisation, paper surface sizing, textile warp sizing, remoistenable adhesives, and temporary binder systems. The grade differs from higher-viscosity partially hydrolysed grades by permitting higher solids in aqueous formulations at equivalent mixer torque, and differs from fully hydrolysed grades by redispersibility in cold water.
| Property | Test method | Value |
|---|---|---|
| Degree of hydrolysis | JIS K6726 | 86.5–89.0 mol% |
| Viscosity | JIS K6726 | 3.2–3.8 mPa·s (4% aqueous, 20°C) |
| pH | JIS K6726 | 5.0–7.0 (4% aqueous) |
| Ash as Na2O | JIS K6726 | ≤0.5 wt% |
| Volatile matter | JIS K6726 | ≤5.0 wt% |
Values are release specifications obtained from manufacturer technical documentation; individual certificates of analysis may report lower lot-specific values.
The hydrolysis range of 86.5–89.0 mol% leaves 11.0–13.5 mol% residual acetate groups distributed along the polymer backbone. These acetate groups interrupt the intermolecular hydrogen-bonded network that makes fully hydrolysed polyvinyl alcohol difficult to dissolve below 80°C. In laboratory make-down trials, powder is sieved into the vortex of a stirred vessel containing water at 20–25°C; the slurry is heated to 80–90°C only when full solution clarity is required. The pH of a 4% solution remains in the 5.0–7.0 range, which is sufficiently mild for most emulsion polymerisation initiator systems. No single published dissolution time applies across all equipment geometries, because dispersion efficiency is governed by impeller tip speed, powder addition rate, and make-down vessel baffle configuration rather than by hydrolysis degree alone.
In vinyl acetate and vinyl acetate-ethylene emulsion polymerisation, GOHSENOL EG-03P functions as the primary protective colloid. The aqueous phase is generally prepared as a 5–10 wt% stock solution and filtered through a 100 µm stainless-steel mesh before charging to remove undispersed gel particles. Production-scale reactors equipped with a three-stage pitched-blade turbine operating at tip speeds of 1.5–2.5 m/s are used to maintain monomer droplet dispersion while limiting shear-induced destabilisation of the protective colloid layer. Polymerisation temperatures are normally controlled at 65–80°C, with potassium persulfate or a redox initiator used for radical generation. At protective colloid concentrations of 3–5 wt% on total monomer, the grade contributes low aqueous phase viscosity, allowing high-solids emulsion polymerisation without exceeding jacket heat-transfer limits. Published studies on vinyl acetate emulsion polymerisation indicate that lower-molecular-weight partially hydrolysed polyvinyl alcohol grades generally produce larger average particle diameters than higher-viscosity grades at equal colloid concentration. Particle size targets and coagulum limits must therefore be revalidated when substituting EG-03P into a formulation originally developed for a higher-viscosity protective colloid. Batch-to-batch variation in coagulum is minimised when the aqueous phase is cooled below 30°C before initiator addition and when monomer is added gradually over the first 30–60 min of the reaction.
The molecular weight distribution of EG-03P, reflected in its low 4% solution viscosity, also affects grafting behaviour during vinyl acetate polymerisation. Partially hydrolysed grades form grafted PVOH-PVAc species that concentrate at the monomer-water interface. When the molecular weight is lower, the interfacial layer is less viscoelastic, which can reduce particle stability at low colloid coverage. Formulators therefore compensate by raising the protective colloid concentration within the 3–5 wt% range or by adding a secondary co-stabiliser such as hydroxyethyl cellulose or a nonylphenol-free nonionic surfactant. In jacketed reactors of 5,000 L or larger, the jacket temperature is ramped from 65°C to 80°C only after the inhibitor induction period ends and the heat release curve stabilises. Post-reaction stripping of residual vinyl acetate monomer is typically conducted at 50–60°C under reduced pressure to avoid damaging the protective colloid layer. Published data for specific coagulum thresholds in grade-for-grade substitution is limited; pilot-scale trials are required.
At the size press, EG-03P is used where a low-viscosity surface size is required without sacrificing film continuity. Typical size press operation at 40–60°C permits transfer of 4–8 wt% solids; the grade is frequently combined with oxidised starch or styrene-acrylate surface sizes to adjust water sensitivity and dry tensile strength. The residual acetate content provides a balance between film strength and repulping efficiency. Addition levels vary with base paper porosity and size press configuration; published data for a single universal addition level is limited. When run on flooded-nip size presses, the low solution viscosity reduces misting and allows faster return flow through the circulating system, but film splitting at high machine speeds may require a rheology modifier if the size solution drops below 25°C.
The production route for GOHSENOL EG-03P involves continuous alcoholysis of polyvinyl acetate in methanol, with saponification terminated before full acetate removal. The degree of hydrolysis is controlled by the methanol-to-methyl acetate ratio, catalyst concentration, and residence time in the belt saponifier, not by post-reaction blending. Residual sodium acetate is removed by washing and neutralisation, with release ash limited to ≤0.5 wt% as Na2O. This manufacturing path distinguishes EG-03P from fully hydrolysed grades that require longer saponification residence time and more aggressive washing. The low solution viscosity is primarily a function of chain-transfer-controlled molecular weight during vinyl acetate polymerisation, so a grade change to EG-03P can reduce protective colloid solution viscosity without changing the hydrolysis target. In continuous units where methyl acetate recovery capacity is limiting, selecting a lower-viscosity partially hydrolysed grade can increase throughput without raising the degree of hydrolysis setpoint or extending saponification residence time.
Within the partially hydrolysed GOHSENOL EG series, the numerical portion of the grade name corresponds to the nominal viscosity tier. GOHSENOL EG-03P therefore represents the low-viscosity member of the series, with a nominal viscosity of 3.2–3.8 mPa·s. Higher-viscosity grades in the same series retain a similar degree of hydrolysis but produce higher aqueous solution viscosity and higher dried film tensile strength. When a low-viscosity protective colloid is required to maintain reactor pumping and heat-transfer efficiency, EG-03P is selected over higher-numbered EG-series grades. Conversely, when a formulation requires greater wet-tack strength or higher solution viscosity, a higher-numbered partially hydrolysed grade is substituted. The degree of hydrolysis remains broadly constant across the series, so the operational difference is primarily molecular weight rather than hydrophilicity.
| Parameter | GOHSENOL EG-03P | Higher-viscosity partially hydrolysed PVA | Fully hydrolysed PVA |
|---|---|---|---|
| Degree of hydrolysis | 86.5–89.0 mol% | representative 86–89 mol% | representative 98–100 mol% |
| Viscosity, 4% aqueous at 20°C | 3.2–3.8 mPa·s | representative 20–40 mPa·s | representative 20–35 mPa·s |
| Cold-water solubility at 20°C | Dissolves with mechanical agitation | Disperses; higher viscosity but soluble with agitation | Not completely soluble below 80°C |
| Film redispersibility | High | Moderate | Low |
| Primary function in emulsion polymerisation | Low-viscosity protective colloid | Protective colloid and co-stabiliser with thickening effect | Not primary choice for low-temperature emulsion polymerisation |
The comparison rows are representative ranges for the corresponding polyvinyl alcohol categories; exact grade-specific values must be confirmed from the supplier certificate of analysis.
Remoistenable adhesive applications use EG-03P at 10–20 wt% aqueous solids, depending on paper stock and re-moistening equipment. The dried film develops re-wetting tack within seconds when passed over a water-remoistening roller at 20–30°C. Stock solutions for adhesive converting lines are stored at pH 5.5–6.5; if the pH drifts below 5.0, trace acetate hydrolysis can increase viscosity during prolonged storage. A biocide is required when the stock solution is held longer than 48 h at ambient temperature. Borate-based tackifiers must be avoided unless controlled gelation is desired, because borate ions form reversible didiol crosslinks with the 1,2-diol segments of polyvinyl alcohol.
GOHSENOL EG-03P should be stored in sealed, moisture-proof containers at or below 40°C and below 60% relative humidity. When the volatile matter exceeds 5.0 wt% as measured by JIS K6726, powder flow becomes cohesive and may bridge in loss-in-weight feeders. Pre-drying is required in humid production areas before open bag discharge. The powder is combustible as a dust; local exhaust ventilation and bonding/grounding of conveying equipment are required. During solution make-down, powder must be added to the water vortex slowly to prevent fisheye formation; a high-shear disperser is not mandatory but reduces batch time. Stock solutions above 10 wt% solids may require heating to 80–90°C to reach full clarity. Avoid contact with strong acids and oxidising agents in the dry state because acid-catalysed acetal formation can reduce solubility and shift solution viscosity.
For food-contact applications, the grade must be evaluated under the appropriate regulatory framework. Adhesive uses are commonly assessed under FDA 21 CFR 175.105, and paper and paperboard uses under FDA 21 CFR 176.170; specific migration limits and extraction conditions must be confirmed for the finished article. The product is supplied with a manufacturer certificate of analysis covering hydrolysis degree, viscosity, pH, ash, and volatile matter according to JIS K6726. REACH registration status, RoHS heavy-metal restrictions, and food-contact compliance for a particular packaging structure should be obtained from the supplier’s technical bulletin and safety data sheet. No conclusion is drawn from composition alone for regulatory conformity.
