| HS Code | 623919 |
| Product Name | ELVANOL T-66 |
| Chemical Identity | Poly(vinyl alcohol) |
| Cas Number | 9002-89-5 |
| Appearance | White granular powder |
| Hydrolysis Mole | 99.0 - 100 |
| Viscosity 4 Solution At 20 C Mpa S | 28 - 34 |
| Ph 4 Solution | 5.0 - 7.0 |
| Ash Content | <= 1.0 |
| Volatile Matter | <= 5.0 |
| Specific Gravity | 1.26 - 1.30 |
| Bulk Density G Cm3 | 0.55 - 0.70 |
| Melting Point C | Approx. 230 |
| Solubility | Soluble in hot water; insoluble in most organic solvents |
As an accredited ELVANOL T-66 factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | ELVANOL T-66 polyvinyl alcohol resin is supplied in 25 kg multi-wall paper bags with a polyethylene liner for safe handling and storage. |
| Container Loading (20′ FCL) | ELVANOL T-66, 20′ FCL: packed in sealed bags on pallets, secured, ventilated container, avoiding moisture and contamination. |
| Shipping | ELVANOL T-66 is a water-soluble polyvinyl alcohol resin supplied as a free-flowing powder. It is non-hazardous for transport under standard regulations. Ship in sealed containers to prevent moisture pickup; store in a cool, dry area. Avoid exposure to humidity, and handle with standard dust control measures. |
| Storage | Store ELVANOL T-66 in a cool, dry, well-ventilated area away from moisture, direct sunlight, heat, and ignition sources. Keep containers tightly closed when not in use to prevent caking or contamination. Avoid generating dust; use appropriate ventilation and grounding. Maintain moderate temperatures and protect from physical damage. Follow all safety data sheet guidelines for incompatibilities and shelf life. |
| Shelf Life | Store in original container in a dry area; typical shelf life is 2 years from date of manufacture. |
Surface sizing of recycled linerboard and bleached fine paper with ELVANOL T-66 is performed at a size press or film-transfer metering unit using an aqueous solution between 4.0 wt% and 8.0 wt% PVOH solids. The grade is a fully hydrolysed polyvinyl alcohol with a Brookfield viscosity of 5.0–7.0 mPa·s as a 4% solution at 20 °C and a hydrolysis degree of 99.0–99.8 mol%, which permits circulation at machine speeds above 400 m/min without the transfer roll misting observed with higher-viscosity grades. Dissolution at 88 °C to 95 °C under turbine agitation for 30–45 min produces a clear size; undissolved gel particles retained on a 100 µm filter press indicate insufficient cook time or low steam supply. On high-ash recycled liner, a surface size pickup of 0.6–1.5 g/m² dry solids per side reduces air permeability and improves IGT print pick resistance when tested according to ISO 3783. Oil and grease holdout is commonly evaluated by TAPPI T 454; fully hydrolysed grades typically show improved resistance relative to semi-hydrolysed grades at equivalent pickup. Starch co-formulation is possible; a typical starch-to-PVOH dry ratio of 3:1 to 6:1 is used to reduce cost while retaining the polar barrier function. The cooked size is held at 65–75 °C in an insulated circulation tank; residence times beyond 4 h at pH above 8.0 can hydrolyse residual acetate groups and increase solution viscosity by more than 10%, although T-66 has low residual acetate. A 200-mesh screen in the return line protects the metering rod from gel particles. Foam produced by high-speed transfer rolls is controlled with a nonionic defoamer at 0.05–0.15 wt% on wet size; excessive defoamer deposits on the sheet and reduces ink receptivity. Borate-based insolubilisers must not be added directly to the holding tank because borate ions crosslink the fully hydrolysed PVOH chain and generate a discontinuous viscosity increase above pH 8.2; if wet-rub resistance is required, the borate solution should be metered into the size after the final screen and before the applicator. In food-contact paperboard, the use of PVOH must be checked against 21 CFR 176.170 and 21 CFR 176.180, depending on food type and contact conditions.
Jet cooking of ELVANOL T-66 for cotton and cotton-polyester warp sizing requires elevated temperature because the fully hydrolysed grade does not disperse adequately below 80 °C. A steam-injection jet cooker operating at 105 °C to 120 °C with a hold time of 15–25 min and a pressure of 0.15–0.25 MPa produces the clearest filament film; lower hold times leave gel particles that adhere to split rods and increase warp breaks on high-speed air-jet looms. Formulation solids for ring-spun cotton warps of Ne 20–40 are typically set at 8.0–11.0 wt% PVOH, with 0.5–1.5 wt% of a nonionic wax lubricant and 0.1–0.3 wt% of a silicone-free defoamer on liquid size weight. Size pickup on the warp yarn is controlled at 8–14% dry add-on, measured by oven-dry yarn mass before and after the size box. The film tensile strength and abrasion resistance are evaluated by ASTM D2256 single-strand yarn tensile testing and by a hairiness tester after sizing; fully hydrolysed grades increase yarn tensile retention but can reduce weaving efficiency if the size film is over-dried above 130 °C because thermal embrittlement raises breakage in the reed. Desizing requires a separate hot-water wash at 80 °C or above, since PVOH desizing cannot be accomplished with starch enzymes alone. Alkaline oxidative desizing with 0.5–1.0 mL/L hydrogen peroxide at pH 9.0–10.0 is used where residual size must be below 0.2 wt% on fabric before dyeing; residual PVOH above this threshold produces uneven reactive dye uptake. Polyol plasticizers such as glycerol at 3–5 phr may reduce film brittleness but also increase size sensitivity to high weaving room humidity above 70% RH. Published data specifically for T-66 in this formulation window is limited; mill qualification trials are required to set dryer temperature profiles.
Water-based laminating and tube-winding adhesives prepared with ELVANOL T-66 are normally compounded at 10.0–18.0 wt% PVOH solids and applied by roller or slot-die at a wet film add-on between 80 g/m² and 150 g/m². The viscosity of the adhesive at 20 °C remains manageable because the grade’s 4% solution viscosity is 5.0–7.0 mPa·s, but concentrated solutions develop a shear-thinning response that affects transfer roll film splitting. A plasticizer such as glycerol, sorbitol, or polyethylene glycol is added at 5–15 phr on dry PVOH to reduce blocking and improve cold flex; insufficient plasticizer below 5 phr in tube winding causes film embrittlement and poor ply adhesion on high-density carton board. Wet tack is assessed under production compression using a hydraulic platen press set to 0.2–0.5 MPa and a dwell time of 3–10 s; fully hydrolysed grades develop higher initial fibre tear on uncoated recycled board because water is released faster into the substrate. The trade-off is an open time of less than 60 s at 25 °C and 50% RH on absorbent kraft, which limits hand assembly operations. FDA-compliant packaging adhesive must be formulated within 21 CFR 175.105; if the adhesive is used on food contact board, 21 CFR 176.170 applies to the finished article. Borax or boric acid must not be mixed into the raw adhesive storage tank at concentrations above 0.1 wt%; borate-PVOH complexes raise torque sharply and can form cohesive gels in the transfer lines. Instead, a diluted borate solution is metered immediately before the nip when extended open time or thixotropy is required. Peel strength of laminated paperboard is evaluated by ASTM D1876 T-peel; values tend to be highly dependent on substrate porosity, adhesive penetration, and press solids rather than PVOH type alone.
In blade coating of paperboard and offset printing grades, ELVANOL T-66 functions as a co-binder and water-retention agent in colours containing ground calcium carbonate or kaolin at total solids of 62–68 wt%. The PVOH addition is normally kept between 0.3 parts and 1.0 parts per 100 parts dry pigment because the fully hydrolysed chain interacts with calcium ions and can increase high-shear viscosity beyond the range tolerated by short-dwell blade coaters. High-shear viscosity is measured with a capillary viscometer at 2,500 s⁻¹ and controlled at 40–70 mPa·s for blade runnability; the actual acceptable range depends on blade angle, coater speed, and base sheet roughness. Water retention is measured by a pressure filtration test such as TAPPI T 701 or by an Åbo Akademi gravimetric water-retention meter; PVOH increases water retention in the colour and reduces binder migration to the sheet surface during hot air drying. The dry coating is tested for brightness according to ISO 2470-1, surface strength according to ISO 3783 IGT picking, and stiffness according to ISO 2493. The limiting condition for T-66 is foam generation under high-speed Cowles dispersion; a silicone-free defoamer at 0.05–0.15 wt% on total wet colour is often required, but excess defoamer reduces coating gloss and creates fisheyes. If wet-rub resistance is required, the mill can add an insolubilizer such as ammonium zirconium carbonate or glyoxal at 0.5–1.5 parts per 100 parts dry PVOH only in the final mixing stage to avoid premature crosslinking; glyoxal is less effective below pH 5.0, while AZC reacts prematurely above pH 8.5.
| Parameter | Method | Relevance |
|---|---|---|
| Low-shear viscosity | ASTM D2196 | Circulation and screen passage |
| High-shear viscosity | ASTM D4287 | Blade runnability |
| Water retention | TAPPI T 701 | Binder migration control |
| pH | ISO 787-9 | Crosslinker reactivity |
| Brightness | ISO 2470-1 | Print quality |
| Surface strength | ISO 3783 | Picking resistance |
Solution-cast films from ELVANOL T-66 are produced at pilot scale from an aqueous dope of 8.0–12.0 wt% PVOH containing 10–30 phr glycerol or sorbitol on dry PVOH; the dope is degassed under vacuum, then cast on a chrome-plated steel belt or a PET carrier web and dried in multi-zone ovens from 60 °C to 90 °C. The fully hydrolysed backbone gives the dried film tensile strength and oxygen barrier at low humidity, but it also raises the dissolution temperature into the 60–80 °C range, making this grade unsuitable for cold-water detergent sachets where dissolution below 30 °C is required. For controlled-release or transfer-release applications in which water solubility is needed only above 65 °C, the cast film route is technically viable but requires a plasticizer level above 20 phr to avoid brittleness during slitting. Film tensile properties are measured according to ISO 527-3; elongation at break is strongly conditioned by relative humidity, and conditioning at 50% RH for 24 h is mandatory before comparison. Oxygen transmission is measured according to ASTM D3985 at 0% RH and 23 °C; at high relative humidity above 75% RH, the barrier performance drops because water plasticizes the film. In food contact film applications, compliance with 21 CFR 177.1670 must be verified for the specific additives used. Extrusion of T-66 without pre-compounded plasticizers is not an established production practice; published data for blown film extrusion of this specific grade is limited.
In suspension polymerization of vinyl chloride, the particle size distribution and plasticizer absorption of the PVC grain are governed by the type and combination of PVOH suspending agents. ELVANOL T-66, with a fully hydrolysed structure and low 4% solution viscosity, is considered for the high-hydrolysis fraction of a dual-PVOH package where the low-hydrolysis fraction supplies surface activity and the high-hydrolysis fraction controls grain porosity and bulk density. Total PVOH dosing in suspension PVC is typically between 0.05 wt% and 0.20 wt% based on vinyl chloride monomer; the ratio of high-hydrolysis to low-hydrolysis PVOH is adjusted from 20:80 to 50:50 depending on reactor size, impeller geometry, and target K-value. Fully hydrolysed PVOH grades produce a more rigid monomer-water interface and reduce coalescence during the early polymerization stage, which can increase the median particle size and narrow the distribution, but they also have a lower cloud point and can deposit on reactor walls if the condenser reflux is not controlled. Plasticizer absorption is measured according to ASTM D3367 or ISO 4608 on internal dry blends; cold plasticizer absorption data are used to infer grain porosity. Reactor fouling is monitored by visual inspection of the baffle and by pressure drop across the reflux condenser; substitution of a semi-hydrolysed grade with T-66 in an existing recipe without adjusting agitation speed can shift the particle size distribution and may require an increase in impeller tip speed. Published data specifically for ELVANOL T-66 in vinyl chloride suspension polymerization is limited; bench-scale reactor trials with a 10 L stirred autoclave are recommended before plant-scale substitution.
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ELVANOL T-66 is a fully hydrolyzed polyvinyl alcohol (PVOH) grade supplied as white to off-white granules. The resin carries CAS 9002-89-5 and is produced by alcoholysis of a vinyl acetate homopolymer, leaving residual acetate groups in the 1.2–2.0 mol% range. Current manufacturer specifications list a 4 wt% aqueous solution viscosity of 5.2–6.2 mPa·s at 20 °C, with hydrolysis degree 98.0–98.8 mol%, pH 5.0–7.0, volatile matter ≤5.0 wt%, and ash ≤0.5 wt%. The material is utilized in water-based adhesives, paper sizing, textile sizing, ceramic binders, and as a protective colloid in emulsion polymerization.
| Parameter | Test method | Value |
|---|---|---|
| 4% aqueous solution viscosity at 20 °C | JIS K6726 / Brookfield rotational viscometer | 5.2–6.2 mPa·s |
| Hydrolysis degree | JIS K6726 | 98.0–98.8 mol% |
| pH of 4% solution | JIS K6726 | 5.0–7.0 |
| Volatile matter | Loss on drying | ≤5.0 wt% |
| Ash | JIS K6726 | ≤0.5 wt% |
The primary differentiation of T-66 among fully hydrolyzed polyvinyl alcohol grades rests on the 5.2–6.2 mPa·s solution viscosity window. Compared with partially hydrolyzed grades in the 87–89 mol% range, T-66 forms films with lower cold-water solubility and higher tensile strength as measured by ASTM D882-18 on cast films, but requires dissolution temperatures of at least 85–90 °C. Compared with fully hydrolyzed grades at higher viscosity windows, the 5.2–6.2 mPa·s specification permits higher coating solids or cleaner adhesive transfer while retaining water resistance. The lower molecular weight associated with this viscosity reduces solution stringiness and improves leveling in metered film applications. In cold-water packaging film, partially hydrolyzed grades dissolve at 20–40 °C and are therefore preferred; T-66 is not suitable for that purpose because undissolved particles remain at temperatures below 85 °C.
In hot-melt-free paper lamination adhesives, T-66 is typically compounded at 15–20 wt% solids with plasticizers such as glycerol or sorbitol at 10–20 phr on resin. The lower viscosity allows pumping through slot die coaters with a dry coat weight of 0.5–3.0 g/m². Higher-viscosity fully hydrolyzed grades produce equivalent film strength but require solids reduction of 3–5 wt% to achieve the same coating viscosity, reducing line speed or requiring additional drying capacity. Batch-to-batch viscosity variation within ±0.3 mPa·s is typical; production lots outside the 5.2–6.2 mPa·s band are blended or downgraded.
Solution preparation of this grade is constrained by the solubility behavior of high-hydrolysis PVOH. Granules must be dispersed in cold water under agitation before heating; direct addition to water above 80 °C can cause surface gelation and lump formation. A high-shear disperser with a tip speed of 8–12 m/s is used for 5–10 min to wet out particles. The slurry is then heated to 90–95 °C and held for 30–45 min until the solution becomes clear. Viscosity checks are made after cooling to 20 °C; values outside 5.2–6.2 mPa·s at 4 wt% indicate dissolution error or water quality interference. At ambient relative humidity above 60%, the granules absorb moisture, alter feed accuracy, and can develop microbial contamination in storage hoppers. Pre-drying at 60–70 °C for 2–4 h is required for moisture-compromised material.
For waterborne paper adhesives, borax is introduced as a rheology modifier and tackifier after complete PVOH dissolution. A 5 wt% borax solution is metered into the PVOH solution at 0.5–2.0 phr based on dry resin. At these levels, wet tack and open time increase without irreversible gelation. Metering rate into a 500 L batch is typically 0.1–0.3 kg/min under an anchor agitator at 20–30 rpm. If borax is added as dry powder, localized gel particles form and filtration through 100 µm screens is required to remove fisheyes.
When borate ions are present, the 1,3-diol segments of T-66 form reversible didiol crosslinks. The resulting viscosity increase is strongly pH- and temperature-dependent. Between pH 8.0 and 9.0, the effect is controllable and shear-thinning; above pH 9.5, the complex can become highly stringy and may not recover after extended shear. At processing temperatures above 60 °C, crosslink density decreases and viscosity falls, while cooling below 30 °C produces gel-like behavior. Production-scale correction of an overcrosslinked batch involves heating to 70–80 °C and adding uncrosslinked PVOH solution in 5–10 wt% increments while measuring torque. The process boundary is narrower than for partially hydrolyzed grades because the high density of hydroxyl groups on T-66 increases the probability of intermolecular crosslinks at equivalent borate loading.
In vinyl acetate-acrylic emulsion polymerization, T-66 is used as protective colloid at 2–6 wt% on total monomer. The fully hydrolyzed grade yields lower water sensitivity in the dried polymer film than partially hydrolyzed PVOH, but the higher dissolution temperature must be accommodated in the colloid preparation stage. Particle size is typically controlled in the 0.5–2.0 µm range when measured by laser diffraction according to ISO 13320:2020. In comparison with low-viscosity grades, T-66 provides higher emulsion viscosity stability under storage at 40 °C for 28 days; published data for this specific configuration is limited.
In paper surface sizing, T-66 is applied at 1–5 wt% solids as part of a starch or styrene-acrylate size press formulation. The high hydrolysis degree reduces rewetting of the dried size film during subsequent printing operations. Measured size pickup of 0.5–2.0 g/m² per side is typical on a film press at 200–800 m/min. For textile warp sizing, the product is blended with starch or polyacrylic acid at 20–40 wt% of the total size solids; add-on levels of 4–10% on yarn weight are monitored by desizing with hot water followed by weight loss determination. Compared with higher-viscosity PVOH, T-66 penetrates less into tight yarns but forms a tougher surface film, reducing hairiness. Addition of 0.1–0.3 wt% of a nonionic surfactant reduces surface defects on low-energy substrates but can increase moisture sensitivity.
Unopened containers stored at 10–30 °C and relative humidity below 60% retain specification viscosity for at least 18 months. At higher humidity, caking and feed irregularities occur. The dry product forms combustible dust; conveying lines should be grounded and fitted with explosion venting. In food-contact applications, the formulated article must be evaluated under 21 CFR 176.170 for paper and paperboard, 21 CFR 176.180 for dry food contact, or 21 CFR 175.300 for resinous and polymeric coatings; the resin itself is not a direct food additive. The product should not be combined with strong oxidizing agents, concentrated mineral acids below pH 2, or high levels of zirconium salt crosslinkers without stability testing. Aldehyde donors such as glyoxal at 5–10 wt% can be used for controlled water resistance development, but excess addition causes embrittlement.
