| HS Code | 825505 |
| Product Name | GOHSENOL KL-05 |
| Chemical Family | Polyvinyl Alcohol (PVA) |
| Appearance | White granular powder |
| Degree Of Hydrolysis | 87 - 89 mol% |
| Viscosity 4 Aqueous Solution 20 C | 4.5 - 5.5 mPa·s |
| Ph 4 Aqueous Solution | 5.0 - 7.0 |
| Volatile Content | ≤ 5.0 wt% |
| Ash Content | ≤ 0.5 wt% |
| Average Degree Of Polymerization | ≈ 500 |
| Melting Point | ≈ 200°C |
| Water Solubility | Soluble in water |
As an accredited GOHSENOL KL-05 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | GOHSENOL KL-05 is supplied in 20 kg polyethylene-lined paper bags as a free-flowing polyvinyl alcohol powder. |
| Container Loading (20′ FCL) | GOHSENOL KL-05 packed in 25kg bags on pallets, loaded into a 20' FCL: about 10 metric tons, secured. |
| Shipping | GOHSENOL KL-05 is shipped as a non-hazardous chemical, typically in multi-layer paper or PE-lined bags. Keep pallets dry and protected from moisture, heat, and mechanical damage. Avoid direct sunlight; store in a cool, ventilated area. No special dangerous-goods declaration is required, but standard safe handling applies. |
| Storage | Store GOHSENOL KL-05 in a cool, dry, well-ventilated area away from heat, sparks, and open flames. Keep the container tightly closed to prevent moisture absorption and contamination. Avoid dust generation and contact with strong oxidizers. Protect from direct sunlight and extreme humidity. Use appropriate personal protective equipment when handling. Follow local regulations for waste disposal and ensure proper labeling and segregation. |
| Shelf Life | Shelf life is typically 2 years from manufacture date when stored unopened in a cool, dry place. |
GOHSENOL KL-05 is typically specified in semi-batch vinyl acetate emulsion polymerisation as a low-viscosity primary protective colloid. The grade carries a 4% aqueous solution viscosity of 4.8–5.8 mPa·s at 20 °C and a degree of hydrolysis of 78.5–81.5 mol%, placing it in the partially saponified PVOH band where graft copolymerisation with vinyl acetate proceeds without the thickened aqueous phase that high-molecular-weight fully hydrolysed protectives produce at high solids. In 12–20 m³ jacketed stainless-steel reactors fitted with reflux condensers and two-flight agitators, KL-05 is pre-dissolved at 20–25 °C at 5–10 wt% in demineralised water and charged into the aqueous phase before monomer feed starts. Polymerisation is initiated after a nitrogen purge with a persulfate/metabisulfite or persulfate/erythorbate redox couple at 65–80 °C, with vinyl acetate fed over 3–5 h under a free-monomer ceiling maintained below 1.0 wt% by feed profiling. The protective colloid grafts through chain transfer at the acetate side group, and the resulting PVOH-poly(vinyl acetate) graft copolymer stabilises latex particles with volume-median diameters in the 0.5–2.0 µm range. Process viscosity is monitored by ASTM D2196-20 at 20 rpm, solids by ISO 3251:2019, residual vinyl acetate monomer by ISO 13741-1, and coagulum by filtration through 100 µm screens. Batch-to-batch variation in grafting degree can shift low-shear viscosity by ±15–25% at constant solids; the correction is usually made by adjusting the redox initiation slope rather than by increasing PVOH loading.
Addition ratios for PVAc homopolymer dispersions lie between 1.2–4.5 wt% of total vinyl acetate monomer feed. The 1.2–2.0 wt% band is selected for high-solids wood adhesive bases at 55–65% solids, where excess PVOH increases water sensitivity in the dried film. The 2.5–4.5 wt% band is used for packaging and paper-laminating adhesives that must resist mechanical shear in transfer pumps and high-speed roller coaters. Terminal products include D3 and D4 non-structural wood adhesives tested to EN 204/EN 205, paper tube winding adhesives, and binder lattices for nonwoven wipes. In D3/D4 grades, water resistance is supplied by post-polymerisation addition of glyoxal or aluminium chloride at 0.3–1.0 wt% of formulation; residual PVOH in the dried film remains water-sensitive unless crosslinked.
On high-speed envelope gumming lines running 300–600 m/min, short-dwell offset gravure heads apply remoistenable adhesive at 45–60 °C and dry the film in three-zone air-impingement tunnels with web surface temperatures of 70–100 °C. GOHSENOL KL-05 is pre-dissolved at 20–30 wt% in warm water and compounded with oxidised tapioca dextrin at a PVOH fraction of 15–40 wt% of total adhesive solids. Higher PVOH fractions increase remoistening tack and rewetting speed, but reduce blocking resistance under high-humidity storage; the low-viscosity profile of KL-05 permits dry coat weights of 5–12 g/m² without application-bath viscosity exceeding 500–1,500 mPa·s at 50 °C. Process control includes viscosity measurement by ASTM D2196-20, solids by ISO 3251:2019, and on-line beta-gauge coat-weight monitoring. Indirect food-contact compliance is assessed under FDA 21 CFR 175.105, and substrate water absorptiveness is tested to ISO 535:2014. Terminal product types include self-seal envelopes, remoistenable paper tapes, laminating labels, and tamper-evident seal strips. A documented failure mode on dry-wheel coater heads is skimming of PVOH at the doctor blade when adhesive temperature falls below 45 °C; the formed gel particles transfer as visible ridges and delay rewetting on the final converting line.
Size press formulations for cast-coated and film-coated printing grades use GOHSENOL KL-05 as a co-binder with oxidised or enzyme-converted starch. The polymer is dissolved separately at 20–25 °C at 8–12 wt% solids and dosed into cooked starch at 50–60 °C, yielding a size solution with a PVOH fraction of 0.5–2.5 dry parts per 100 dry parts of total size solids. On metering film presses running at 800–1,500 m/min, the low-viscosity PVOH component reduces rod-pressure fluctuation and permits a pickup window of 1.0–3.5 g/m² per side. The dried size film increases IGT pick resistance and reduces linting on offset blankets; surface strength is assessed with ISO 3783 or mill-specific IGT methods. Water absorptiveness is tested to ISO 535:2014, surface roughness to ISO 8791-2:2013, and specular gloss of printed sheets to ISO 8254-1:2009. For paperboard intended for food contact, the finished sheet is assessed under FDA 21 CFR 176.170 and 21 CFR 176.180. Terminal products include inkjet receiving papers, release liner base, folding carton board, and high-speed inkjet transactional papers. Mill-scale replacement of a starch fraction with KL-05 at the size press reduces sheeter dusting, but if the PVOH solution is colder than 45 °C when blended with cooked starch, retrogradation can produce clear lumps that block the metering rod and streak the sheet.
| Designation | Parameter | Application context |
| FDA 21 CFR 176.170 | Indirect food-contact paper and paperboard components | Folding carton and food packaging sizes |
| FDA 21 CFR 176.180 | Dry food paperboard components | Bakery and cereal board |
| ISO 535:2014 | Cobb water absorptiveness | Size holdout on coated and film-pressed paper |
| ISO 8791-2:2013 | Parker Print-surf roughness | Printing smoothness of sized surfaces |
| TAPPI T441 | Water absorptiveness of sized paperboard | Packaging board quality release |
For a size mix containing 20–40 wt% GOHSENOL KL-05 on total dry solids, slasher trials on polyester/cotton warps record lower add-on than starch-only formulations at equivalent size-box viscosity. A typical formulation consists of 50–70 wt% thin-boiling starch, 20–40 wt% KL-05, 5–10 wt% acrylic size, and 2–5 wt% wax lubricant, prepared at 8–14% total solids. Cooking is carried out at 85–95 °C in jet cookers; the PVOH is pre-dissolved at 20–25 °C and added after starch gelatinisation, with size-box temperature maintained at 75–85 °C. Squeeze-roll pressure of 0.25–0.45 MPa on a double-squeeze slasher controls add-on; the low-DP KL-05 fraction lowers size-liquor viscosity to 40–80 mPa·s at 85 °C, improving penetration into compact plied yarns without the surface film flaking observed with high-viscosity PVOH. Desizing uses hot-water washing or amylase at 70–85 °C; residual PVOH is checked by iodine spot testing. Compliance is assessed under REACH and OEKO-TEX Standard 100 where skin-contact limits apply; finished fabric abrasion is evaluated by ISO 12947-2:2016. Terminal products include polyester/cotton shirting, workwear, bed linen, and pocketing fabric. At storage humidity above 60%, PVOH bags require pre-drying before weighing because surface moisture promotes lumping during dissolution.
Spray-dried ceramic granules are prepared with GOHSENOL KL-05 as a temporary organic binder at 0.5–2.0 wt% of dry ceramic powder. The polymer is dissolved in the aqueous slip at 20–25 °C before ball milling or high-shear mixing, and the slip is spray-dried at 120–180 °C outlet temperature to produce free-flowing granules with residual moisture of 3–6%. The low-viscosity profile of KL-05 permits binder addition without raising slip viscosity above 1,000 mPa·s at 20 °C as measured by ASTM D2196-20. Uniaxial pressing is conducted at 150–350 MPa; green compacts are debound at 400–600 °C with a ramp of 0.5–1.0 °C/min under air, and burnout is monitored by thermogravimetric analysis according to ISO 11358-1:2014. The binder ash content, specified at ≤0.5% as Na₂O, matters because sodium residues depress sintering activity in alumina and titanate dielectrics. Finished tile properties are evaluated by ISO 10545-3:2018 for water absorption and ISO 10545-4:2019 for modulus of rupture. Terminal products include technical ceramics, electrical insulators, ceramic floor tiles, and pressed refractories. A production failure mode is binder migration to granule surfaces during slow drying, which forms hard outer shells and lowers green strength at the compact centre; this is managed by increasing spray-dryer outlet temperature and maintaining slurry solids above 55 wt%.
In suspension PVC autoclave formulations, GOHSENOL KL-05 is screened as a low-DP partially saponified secondary dispersant alongside a high-DP primary PVOH. Published data for KL-05 in this specific configuration is limited; however, the product hydrolysis range of 78.5–81.5 mol% and low aqueous viscosity place it in the class of secondary suspending agents that reduce interfacial tension without forming an excessively thick film at the vinyl chloride monomer/water interface. Typical screening spans a primary PVOH loading of 0.05–0.15 phm and a secondary PVOH loading of 0.01–0.05 phm in 50–90 m³ stainless-steel autoclaves at 50–70 °C, with a water-to-VCM ratio near 1.2:1 and agitation controlled by impeller tip speed. The secondary dispersant influences particle size distribution, plasticiser absorption, and bulk density. Resin quality is measured as K-value using ISO 1628-2:2020, apparent bulk density using ASTM D1895-17, and plasticiser absorption using ASTM D3367. Terminal products include suspension PVC resins for pipe, fittings, profiles, and cable sheathing. Process boundaries include avoidance of iron contamination, because iron residues accelerate PVOH degradation and shift hydrolysis during storage. Addition of secondary dispersant above the accepted window can reduce resin porosity and create glassy particles that survive gelation in downstream extrusion.
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GOHSENOL KL-05 is a partially hydrolysed polyvinyl alcohol resin in the GOHSENOL K-series, supplied as a granular solid and defined by the interaction between its degree of saponification and its low aqueous solution viscosity. The grade designation is not arbitrary: the numeric suffix 05 correlates with a nominal 4 wt% aqueous solution viscosity of approximately 5 mPa·s at 20°C, while the K-series designation locates the product among partially hydrolysed PVOH grades rather than fully hydrolysed N-series grades. The binding specification for any production lot is the certificate of analysis prepared under JIS K6726:1994, not the trade designation. In industrial use, the material functions as a high-purity water-soluble polymer. The residual acetyl groups along the polyvinyl alcohol backbone reduce the degree of crystallinity, lower the temperature required for hydration, and shift film-surface polarity relative to fully hydrolysed grades. These structural properties make the grade relevant to aqueous emulsion polymerisation, remoistenable adhesives, paper-coating vehicles, and water-based dispersion processes in which low solution viscosity at high solids is a controlling constraint.
The degree of saponification is the first specification boundary. Fully hydrolysed polyvinyl alcohol grades with a saponification degree of 98 mol% or more develop interchain hydrogen bonding dense enough to require dissolution temperatures above 80°C. KL-05 is widely specified in the partially hydrolysed band, commonly reported as 78–82 mol%. The residual acetate units break the stereoregular hydrogen-bonded network, allowing granules to hydrate at 20–25°C without prolonged high-temperature cooking. Viscosity is determined on a 4 wt% aqueous solution at 20°C; the commercial datasheet band is typically 4.5–5.5 mPa·s, measured with a Brookfield LV viscometer. The certificate of analysis reports lot-specific values, and the 4 wt% solution viscosity is the parameter used for incoming inspection because it detects both molecular weight shifts and drying-induced insolubles. Solution pH is typically controlled within 5.0–7.0. The product specification also limits ash content at or below 0.1 mass% and volatile content at or below 5.0 mass%.
These limits are relevant to electronic-grade or optical-coating applications where residual sodium acetate and water content can alter haze, adhesive peel, or solution ageing. The test procedures are drawn from JIS K6726:1994, but the supplier’s certificate of analysis remains the formal control document under ISO 9001 purchasing systems. The grade is also evaluated for degree of hydrolysis retention under accelerated storage. When a specification sheet gives a single viscosity value rather than a range, the value should be interpreted as a midpoint, not a tolerance. Published data for this specific configuration is limited when a converter requires a single-value viscosity for an in-process control chart; the certificate of analysis governs lot acceptance.
In aqueous make-down, the low-viscosity specification of KL-05 allows cold-water predispersion, but complete dissolution still requires controlled heating and mechanical shear. A production-scale make-down vessel is typically a jacketed stainless steel tank fitted with a Cowles-type high-shear disperser and a temperature probe. The granules are added through a screened funnel into the vortex while agitation is maintained at 300–500 rpm. The slurry is heated to 85°C and held for 30–60 min. Undissolved gel particles are removed through a 100-mesh stainless steel filter before transfer to the storage tank. At relative humidity above 60%, the resin absorbs atmospheric moisture. Predrying at 60–80°C for 2 h is applied before gravimetric batching to limit moisture-induced weighing error; this is a critical boundary because a 1 mass% moisture shift changes the active polymer concentration by the same amount and can push a high-solids coating outside its specified viscosity window.
The product is incompatible with high-valence metal salts at low pH, which can precipitate the polymer. Solution storage in unlined carbon steel is avoided because dissolved iron discolors the solution and reduces compatibility with optical brighteners. If the solution is held for more than 48 h at 35°C, a biocide approved for polyvinyl alcohol systems is required to prevent microbial growth in non-sterile production environments. For cleanroom use, the solution is filtered through a 5 µm absolute-rated cartridge and checked for turbidity below 5 NTU before release. These controls are not optional when the formulated product is used in optoelectronics or pharmaceutical transfer films.
The choice of KL-05 in emulsion polymerisation is a balance between colloidal stability, final latex viscosity, and grafted polymer fraction. In a 1,000 L batch reactor with a 45° pitched-blade turbine operating at 120 rpm, a typical addition of 3.0 wt% KL-05 based on total monomer mass provides steric stabilisation of vinyl acetate droplets and particles without raising the final latex viscosity beyond the transfer range of diaphragm pumps. The residual acetate groups participate in radical transfer to the polymer backbone during vinyl acetate polymerisation. This lowers the frequency of irreversible grafting onto the colloid compared with fully hydrolysed grades; the practical consequence is lower Brookfield viscosity drift after 14-day storage at 40°C. The low aqueous viscosity of KL-05 also allows higher colloid loadings before the pre-emulsion becomes too thick for the reactor’s circulating loop.
The grade is not appropriate when maximum water resistance of the dried film is required. The hydroxyl-rich colloid surface absorbs water unless a crosslinker or a higher-hydrolysis co-colloid is specified. In polymerisation reactors with severe mechanical shear, such as rotor-stator pre-emulsifiers operated above 3,000 rpm, KL-05 maintains droplet stability but may require an additional anionic surfactant to control particle size below 300 nm. Published data for this specific configuration is limited, and reactor-scale validation is required because the particle size distribution is affected by initiator feed rate, agitation power input, and the presence of acetate buffer.
Remoistenable adhesive coatings require a polymer that dries to a non-blocking film yet rehydrates rapidly when wetted. An 8 wt% aqueous solution of KL-05 can be applied through a 250-line gravure cylinder at 150 m/min; the low solution viscosity permits clean cell evacuation, and the partially hydrolysed chain architecture allows rewetting within 3–5 s when a water droplet is applied at 25°C. The dry coat weight is typically 3–5 g/m². Under these conditions, the product forms a continuous film but does not reach the tensile strength of a higher-viscosity partially hydrolysed grade.
Coating lines that use air-knife or roll-coating equipment benefit from the viscosity ceiling of KL-05: at 8 wt%, the solution viscosity remains low enough to avoid film splitting at speeds above 120 m/min. The low ash content keeps dried-film haze low under a 20° gloss measurement geometry, a feature that is relevant when printed graphics are applied over the adhesive layer. The operational boundary is set by film strength and moisture resistance, not by dissolution. If the coated paper is exposed to relative humidity above 70% before converting, blocking can occur; an anti-blocking agent or a harder co-resin is required. For remoistenable label stock, the rewetting time is measured with a 10 µL water droplet on a standard A4 paper substrate under 23°C and 50% relative humidity.
On a production paper-coating line, KL-05 is typically evaluated at 2–6 wt% in a coating colour containing precipitated calcium carbonate and kaolin. The low aqueous viscosity reduces thickening in high-solids blade-coating formulations. A blade coater running at 1,000 m/min requires a low-shear viscosity below 300 mPa·s at 25°C to maintain coater runnability. KL-05 at 4 wt% solution viscosity of 4.5–5.5 mPa·s allows the formulator to add more pigment before the coating colour reaches the blade-coater high-shear viscosity limit. The binding strength of the dried coating is lower than that of a fully hydrolysed or higher-viscosity grade; therefore latex binders are used as the primary binder and KL-05 functions as a water retention and rheology additive. In continuous warp sizing, a cook kettle at 95°C is used to prepare a 6 wt% solution; the low-molecular-weight grade penetrates the yarn bundle and improves abrasion resistance without excessive warp stiffness. The size film loses tensile strength under high-humidity weaving sheds; humidification above 70% relative humidity can cause loom droppings. Published data for this specific configuration is limited.
Comparisons with other GOHSENOL grades are made on the basis of 4 wt% viscosity and degree of saponification rather than film colour or granule size. Fully hydrolysed N-series grades with solution viscosities in the 25–30 mPa·s range and saponification above 98 mol% provide higher tensile strength and water resistance. They require hot-water dissolution above 80°C and can raise mix viscosity beyond the limit of air-knife coaters. The cost of using KL-05 is therefore a reduction in wet strength and water resistance, not a reduction in solubility. Higher-viscosity partially hydrolysed K-series grades retain cold-water solubility but generate more viscous solutions at equal solids. Their films are tougher, but their transfer and levelling on high-speed roll coaters are more difficult.
KL-05 occupies the low-viscosity end of the partially hydrolysed range. The selection rule is straightforward: where aqueous solubility after drying is the primary specification, KL-05 is specified; where a permanent moisture barrier or high film tensile strength is required, the formulator selects a fully hydrolysed grade or adds a compatible crosslinker. The product should not be combined with amine-based additives that raise solution pH above 9.0; under high-pH ageing, ester residual groups can hydrolyse, shifting the effective degree of saponification and changing rewetting time. For food-contact applications, compliance with regional positive lists, including 21 CFR sections relevant to the specific food type and use condition, must be confirmed on the final formulated article; the neat resin datasheet is not a sufficient regulatory clearance.
