| HS Code | 127605 |
| Product | Mowital B 60 H |
| Chemical Type | Polyvinyl butyral (PVB) |
| Physical Form | White to off-white free-flowing granules |
| Density | 1.1 g/cm³ |
| Viscosity | 60 mPa·s (5% solution in ethanol at 20 °C) |
| Hydroxyl Content | 27-30 wt% |
| Acetal Content | 70-75 wt% |
| Acetate Content | 1-2 wt% |
| Glass Transition Temperature | 60-65 °C |
| Tensile Strength | 40-50 MPa |
| Elongation At Break | 80-120% |
| Water Absorption | 0.5-1 wt% |
| Solubility | Soluble in alcohols, glycol ethers, esters, ketones and chlorinated hydrocarbons; insoluble in water and aliphatic hydrocarbons |
| Refractive Index | 1.485-1.495 |
As an accredited Mowital B 60 H factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Mowital B 60 H is supplied as free-flowing granules in 25 kg bags, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | Load 20′ FCL with palletized Mowital B 60 H bags, secure lashing, protect from moisture, and ensure safe, stable transport. |
| Shipping | Mowital B 60 H, a polyvinyl butyral powder, is shipped in sealed multi-layer bags or fiber drums to prevent moisture uptake. Transport in dry, covered containers, protected from direct heat and ignition sources. It is not classified as dangerous goods under standard regulations, but dust clouds may form explosive mixtures; ensure proper ventilation and secure labeling. |
| Storage | Store Mowital B 60 H in its original, tightly closed container in a cool, dry, well-ventilated area away from heat, direct sunlight, and ignition sources. Protect from moisture and humidity to prevent caking or degradation. Avoid generating dust. Keep separate from incompatible materials and oxidizers. Follow local regulations; use within manufacturer’s recommended shelf life. |
| Shelf Life | Shelf life is 2 years from production date when stored in original, unopened packaging under cool, dry conditions. |
In solvent-based flexographic and gravure lamination inks for flexible food packaging, Mowital B 60 H operates as a high-molecular-weight polyvinyl butyral binder with a 10% solution viscosity in ethanol of 50–70 mPa·s at 20°C, placing it in the high-viscosity segment of the Mowital B range and directing its use toward high-solids lamination inks rather than low-viscosity wide-web flexographic inks. The resin addition typically falls between 4 wt% and 12 wt% of total wet ink, with the upper portion reserved for gravure lamination inks printed on retort or pasteurised pouches where retained adhesion after sterilisation is the controlling variable. In production, the binder is dissolved at 25–35% solids in an ethyl acetate/ethanol solvent blend, usually 70:30 to 85:15, then charged to a bead mill containing 0.8–1.2 mm zirconia grinding media. The dispersion stage is operated at 40–50°C jacket temperature to avoid ethanol loss, and letdown viscosity is adjusted to 18–25 s in a DIN 4 cup at 25°C. On-press, flexographic units with anilox rolls in the 800–1200 lpi range deliver dry film weights between 1.5 g/m² and 2.5 g/m², while gravure cylinders in the 60–80 l/cm range deposit 2.0–3.5 g/m². The terminal constructions are PET or BOPP reverse-printed laminates to PE or CPP, where T-peel values after 24 h conditioning must exceed 2.5 N/15 mm on polyester film; printed snack food laminates, confectionery wrappers, and stand-up pouches are the principal finished product categories. Food-contact compliance is anchored to EU 10/2011 with an overall migration limit of 10 mg/dm², FDA 21 CFR 175.300 for resinous and polymeric coatings used on food-contact films, and Swiss Ordinance 817.023.21 where ink components must be listed in the positive list. Batch-to-batch variance in PVB hydroxyl content, typically 18–21 wt%, shifts solvent-release behaviour and lamination bond development, so press-side checks of retained solvent by headspace gas chromatography at 180°C for 15 min are used to keep retained solvent below 5 mg/m².
The failure mode most commonly observed on coil coating lines is not film delamination but alkaline blister formation after 500 h neutral salt spray when the PVB wash primer is applied below 6 µm dry film thickness or when the acid catalyst dose drifts below 0.3 wt% of the A-component. Mowital B 60 H is incorporated in two-component etch primers at 5–8 wt% of total liquid primer, with PVB solids representing 10–15% of the non-volatile portion after phosphoric acid and anticorrosive pigment addition. The production sequence begins with high-shear dissolving of the PVB resin in isopropanol at 20–25% solids; this is followed by addition of zinc phosphate or zinc aluminium phosphate at 4–6 wt% and phenolic resole at 1–3 wt% of total formula. The B-component is phosphoric acid diluted to 10–20% in isopropanol, metered into the mix at the point of application to give a pot life between 6 h and 10 h. Reverse roller coaters apply 6–10 µm dry film over hot-dip galvanized steel or aluminium coil, and the line runs at 40–80 m/min through a three-zone oven with peak metal temperatures of 180–220°C for 80–120 s. Adhesion after cure is tested by ASTM D3359 cross-hatch with classification 5B, and accelerated corrosion is evaluated by ISO 9227 neutral salt spray for 500 h with scribe creep below 2 mm. Compliance references include REACH for solvent-borne import into EU markets and RoHS 2011/65/EU for electromechanical enclosure applications. The terminal products are coil-coated architectural cladding, appliance housings, and metal office furniture. Operational boundaries are narrow: relative humidity above 60% during application causes acid-catalysed hydrolysis of the PVB backbone at the air interface, producing surface tack and intercoat adhesion loss, while amine-containing topcoat hardeners must be avoided because they neutralise the phosphoric acid catalyst before film formation completes.
Ceramic tape casting lines running Mowital B 60 H encounter the central demand of maintaining green strength after solvent release while ensuring complete binder removal before ceramic densification. Slip formulations for multilayer ceramic capacitor (MLCC) tape casting use the resin at 8–15 parts by weight per 100 parts of ceramic powder, typically barium titanate or low-temperature co-fired ceramic glass-ceramic compositions. The binder is dissolved at 15–20 wt% in an ethanol/toluene or ethanol/MEK solvent system; plasticiser-to-binder ratio is maintained between 0.25 and 0.45 using a polyalkylene glycol or citrate ester plasticiser to depress the glass transition of the dried tape without sacrificing tensile strength. Slip solids are held between 55 wt% and 65 wt%, and Brookfield viscosity is adjusted to 1500–3000 mPa·s at 25°C before deaeration in a vacuum vessel at 50–100 mbar for 30–60 min. Tape casting is performed at 0.5–2.0 m/min through a doctor blade gap of 0.2–2.0 mm, producing green tape thicknesses from 5 µm to 200 µm; drying zones are operated in a gradient from 40°C to 80°C to avoid skinning. Green density after drying should exceed 50% of theoretical density, measured by mercury porosimetry before screen printing of nickel or silver-palladium electrodes. Lamination of registered sheets is carried out at 50–70°C and 20–40 MPa for 10–20 min. Binder burnout becomes the critical process conflict: the PVB backbone degrades in air from 250°C to 450°C, but heating rates above 2°C/min in the 250–350°C window produce exothermic degradation that cracks the green body; residual carbon after burnout must remain below 0.05 wt%, measured by LECO combustion analysis. Compliance is anchored to RoHS 2011/65/EU for restricted substances in finished capacitors, IEC 60384-1 for generic capacitor performance, and REACH for EU market access. Terminal products include MLCCs for consumer electronics, automotive powertrain control units, and RF modules; LTCC substrates for wireless communication modules are a secondary finished form.
Unlike acrylic or polyester heat-seal resins, Mowital B 60 H provides a peelable or destruct-seal response on aluminium foil lidding without requiring a secondary primer, because the PVB hydroxyl groups form hydrogen bonds with oxidised aluminium and the residual acetate content between 1 wt% and 4 wt% moderates seal initiation temperature. The resin is incorporated at 10–25 wt% of the wet lacquer, with the lower portion used for peelable dairy lids and the upper portion for pharmaceutical blister lidding where tamper evidence requires cohesive failure within the lacquer layer. Lacquers are applied by direct gravure or reverse roller to aluminium foil between 20 µm and 30 µm thickness at dry coat weights of 1.5–3.0 g/m². Oven drying is staged from 120°C to 160°C with a dwell time of 10–15 s, followed by immediate rewind at controlled tension to avoid blocking. Heat sealing to PVC, PVdC, or PP blister sheet is conducted at 160–200°C, pressure 0.3–0.6 MPa, and dwell time 0.5–1.5 s; seal strength measured after 24 h conditioning exceeds 5 N/15 mm for pharmaceutical lidding and 8–15 N/15 mm for destruct seals on peelable dairy foil lids. Compliance coverage includes EU 10/2011 for plastic food contact layers, FDA 21 CFR 175.300 for resinous coatings on food-contact metal, and USP <661.1> for pharmaceutical packaging plastic materials, with extractables testing performed according to ISO 10993-18 where the application enters medical device packaging. The main production bottleneck is retained ethanol in the sealant layer: above 2 wt% residual solvent, seal strength collapses because solvent volatilisation during sealing creates microvoids at the foil interface. Terminal products are pharmaceutical tablet blister lidding, unit-dose packaging, and heat-sealed dairy foil lids.
Metal-to-metal bonding with phenolic-polyvinyl butyral adhesives begins with a resole phenolic resin as the thermosetting backbone and Mowital B 60 H as the flexible co-binder at 20–35 wt% of total resin solids; the phenolic fraction is maintained between 65 wt% and 80 wt% of resin solids to balance shear strength and peel compliance. Published industrial data for this specific high-temperature cure configuration is limited, but solvent-borne formulations with 60:40 MEK/ethanol reduce viscosity to 500–1500 mPa·s at 25°C for roller or brush application at dry film thicknesses of 20–40 µm. The bonding process for steel-to-steel or aluminium-to-steel assemblies involves air drying for 30–60 min to flash solvents, then pressing at 150–180°C and 0.5–1.0 MPa for 20–40 min. Lap shear strength measured by ISO 4587 typically exceeds 15 MPa on degreased cold-rolled steel, while ASTM D1002 is used for aluminium adherends. Compliance is governed by REACH for MEK content and by RoHS 2011/65/EU where bonded assemblies enter electronic enclosures. The compatibility boundary is critical: PVB-phenolic adhesives must not be combined with amine-based accelerators, because the amine reacts with formaldehyde species released from the resole and causes premature crosslinking in the wet film. Terminal products include automotive brake shoe bonding, clutch facing attachment, and metal sandwich vibration damping laminates.
Acid-curing wood sealers formulated with Mowital B 60 H typically use the resin at 5–15 wt% of total resin solids, replacing a portion of nitrocellulose to reduce yellowing and improve adhesion to closed-grain hardwood species such as beech and maple. The coating is applied by spray or curtain coater at wet film weights between 80 g/m² and 150 g/m², dried at 20–25°C for 30–45 min, and sanded with 240–320 grit paper before a topcoat of acid-curing urea-formaldehyde or polyurethane lacquer is applied. p-Toluenesulfonic acid catalyst is added at 0.5–1.5 wt% of total formula immediately before application; pot life is 8–12 h. The principal formulation conflict is solvent balance: Mowital B 60 H tolerates ethanol/butyl acetate blends, but water content above 0.3 wt% in the solvent phase causes phase separation because the PVB hydroxyl groups compete with the acid catalyst for water. Compliance for finished wood products in toy and children’s furniture segments is tested under DIN EN 71-3 for migration of heavy metals, while ASTM D3359 cross-hatch adhesion on sanded beech is expected to reach class 4B or 5B after 24 h of cure. The terminal products are wooden toys, furniture sealers, and interior millwork basecoats. Operational limits include a lower addition bound of 5 wt% resin solids, below which sanding generates white powder and film toughness drops, and an upper bound of 15 wt%, above which viscosity rise forces the use of slow solvents that extend dry-to-stack time beyond 4 h and create blocking in stacked furniture components.
Competitive Mowital B 60 H prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
Polyvinyl butyral as a class is defined by CAS RN 63148-65-2. Mowital B 60 H is a thermoplastic acetal resin produced from polyvinyl alcohol and butyraldehyde, supplied by Kuraray Europe GmbH under that trade designation. The B 60 H model designation places the product in the medium-high molecular weight tier of the Mowital range: the B prefix identifies the butyral backbone, and the numeric code tracks nominal viscosimetric molar mass. The resin is a statistical terpolymer containing butyral, residual vinyl alcohol, and residual vinyl acetate units; that sequence distribution controls solubility in polar solvents, plasticizer uptake, adhesion to oxide and glass substrates, and melt flow. For Mowital B 60 H, the published datasheet lists a solution viscosity in 10 wt% anhydrous ethanol at 20 °C of 150–250 mPa·s using DIN 53015. Residual polyvinyl alcohol content is typically 18–21 wt%, while residual polyvinyl acetate content is controlled below 3 wt%. The glass transition temperature, taken as the midpoint of the DSC curve per ISO 11357-2, is 68–70 °C. Non-volatile content, determined by ISO 3251, is specified above 97.5%, and ash content by ISO 3451-1 is normally below 0.05%. The product is supplied as a white, free-flowing powder or granular solid with bulk density in the range of 0.4–0.6 g/cm³; that physical form affects dust-controlled feeding into gravimetric dosing units and high-shear mixers. Fine dust fractions must be managed under local ATEX provisions because the material can form combustible dust clouds under defined concentration and ignition conditions.
The principal difference between Mowital B 60 H and adjacent Mowital H grades is molar mass and the resulting solution viscosity, not the residual hydroxyl specification. All standard H grades share similar polyvinyl alcohol content, so adhesion chemistry remains broadly constant across the series. Mowital B 30 H provides low solution viscosity and permits higher coating solids at a given application viscosity; Mowital B 45 H occupies an intermediate position; Mowital B 75 H provides higher cohesive film strength but demands more solvent to reach a processable viscosity. Mowital B 60 H is therefore selected where green strength, film toughness, and solvent demand must be balanced against powder wetting and dispersion stability. The following table gives typical solution viscosity ranges for adjacent grades; values are typical ranges from manufacturer literature and do not constitute specification limits. Lot-specific certificate-of-analysis data prevails for incoming acceptance.
| Grade | 10% solution viscosity, mPa·s | Relative molar mass | Processing consequence |
|---|---|---|---|
| Mowital B 30 H | 40–60 | Low | Higher solids at target viscosity; lower green strength |
| Mowital B 45 H | 80–120 | Intermediate | General-purpose binder balance |
| Mowital B 60 H | 150–250 | Medium-high | Higher green strength and solvent demand in tape casting |
| Mowital B 75 H | 300–450 | High | Maximum cohesive film strength; limited high-solids processing |
Differences from lower-acetalization PVB grades are more pronounced. Mowital B 60 H contains sufficient residual hydroxyl groups to form hydrogen bonds with silanol and metal oxide surfaces; this makes it suitable for ceramic green tape and glass adhesion applications where purely hydrophobic binder resins fail. However, the same hydroxyl functionality increases equilibrium moisture uptake. Pre-drying to below 0.3 wt% residual water by Karl Fischer titration per ISO 15512 is required before dissolution in anhydrous ketone or ester solvent blends. Water above that level raises apparent solution viscosity and can cause turbidity or gel streaks when the wet coating enters a forced-air drying oven above 70 °C.
Ceramic tape casting lines using Mowital B 60 H typically operate at binder loadings between 8 wt% and 15 wt% of dry ceramic powder, depending on tape thickness and powder surface area. The slurry is often prepared in a planetary mixer followed by a three-roll mill or high-shear dissolver; final viscosity is frequently measured at 25 °C with a cone-plate rheometer according to ISO 3219. Because B 60 H has higher molar mass than B 30 H, it raises green tape tensile strength after solvent evaporation, but it also increases slurry viscosity at constant binder loading. Published data for this specific tape-casting configuration is limited; therefore, the optimum solids fraction must be validated on the production line rather than imported from generic PVB literature. De-binding in air begins near 220 °C and is substantially complete below 450 °C when the furnace ramp rate is controlled at 2 °C/min and oxygen partial pressure is maintained above 10 kPa. Residual carbon after burnout is strongly influenced by atmosphere ventilation rate and powder packing; laminated tape is typically pressed at 70 °C and 15 MPa for 10 min, just above the glass transition of B 60 H, to promote interlayer fusion without premature binder migration.
Incoming raw-material control for Mowital B 60 H begins with identity verification by infrared spectroscopy against a certified reference spectrum. Quantitative release testing includes non-volatile content by ISO 3251, ash content by ISO 3451-1, and solution viscosity in anhydrous ethanol by DIN 53015. Viscosity is the most sensitive lot-level indicator of molar-mass drift; a viscosity excursion beyond the 150–250 mPa·s range can signal an off-specification polymerization batch, residual water contamination, or partial oxidation. Residual polyvinyl alcohol content is usually reported on the certificate of analysis according to the manufacturer’s internal method; no single ISO procedure covers this compositional assay. The specified range of 18–21 wt% should be confirmed because lower hydroxyl content reduces adhesion to glass and oxide substrates, while higher hydroxyl content raises water sensitivity and can increase the equilibrium moisture uptake of stored powder. Residual acetate below 3 wt% is important for thermal stability; higher acetate levels may promote deacetylation and discoloration during melt compounding above 200 °C. Glass transition temperature by ISO 11357-2 should remain between 68 °C and 70 °C; a shift below 65 °C suggests plasticizer contamination or excessive residual solvent, while a shift above 72 °C may indicate a different acetalization level or crosslinked gel fraction. Melt flow index is less commonly used for PVB because the polymer is shear-sensitive and hygroscopic; when measured, the sample must be dried to below 0.1% moisture before charging to the instrument barrel to prevent bubble formation and false high-flow results.
When Mowital B 60 H is incorporated into acid-catalyzed wash primers containing phosphoric acid and phenolic or melamine crosslinkers, the residual hydroxyl groups participate in acid-promoted curing but also create a narrow processing window. Pot-life of a typical two-component primer is controlled by solution acidity and solids; formulations with pH below 2.5 can exhibit viscosity rise within 24 h as the resin begins to react with the phenolic component. Storage at 5 °C extends pot-life by reducing reaction rate, but condensation resistance after film formation must still be verified by cyclic humidity testing according to ISO 6270-2 or ASTM D4585. Adhesion loss on cold-rolled steel is assessed by cross-cut and pull-off methods; a dry film thickness of 20–25 µm applied over an alkaline-cleaned substrate and cured at 80 °C for 20 min is a typical validation condition. Mowital B 60 H provides higher cohesive film strength than B 30 H in this application, but it may reduce primer shelf-life when the same acid level is used; reformulation should reduce acid content or increase solvent dilution rather than switch to a higher-molecular-weight PVB without adjusting catalyst loading. For amine-free systems, the resin is generally stable; combination with strong amine additives must be avoided because amine neutralization of the acid catalyst suppresses cure and can form insoluble PVB-amine adducts that deposit on spray nozzles.
For gravure and flexographic ink vehicles, the replacement of ethyl cellulose with Mowital B 60 H changes both viscosity-solids behavior and resolubility after drying. The higher molar mass of B 60 H raises solution viscosity at equal solids, so ink formulators typically reduce resin content by 10–20% relative to B 30 H while maintaining the same print viscosity. That reduction lowers vehicle demand but increases the risk of film splitting in high-speed gravure if surface tension is not adjusted. Resolubility of dried ink from the printing plate is governed by residual hydroxyl content; B 60 H remains soluble in ethanol and ethyl acetate blends, but drying temperatures above 70 °C can produce partially insoluble gel if the ink contains acidic pigments or residual catalyst. Solvent-release testing is performed by gravimetric analysis under controlled airflow at 60 °C; retained solvent below 5 wt% after 10 min is typically required for multicolor overprint adhesion. Published data for this specific ink configuration is limited; pilot press validation is required to confirm printability, resolubility, and solvent retention with the specific pigment grind and cylinder engraving geometry.
