| HS Code | 818123 |
| Product Name | Mowital B 16 H |
| Chemical Name | Polyvinyl butyral |
| Manufacturer | Kuraray Co., Ltd. |
| Cas Number | 63148-65-2 |
| Physical Form | White free-flowing powder |
| Color | White |
| Bulk Density | 0.5 g/cm³ |
| True Density | 1.1 g/cm³ |
| Glass Transition Temperature | 70 °C |
| Viscosity 10 Percent In Ethanol | 16 mPa·s |
| Hydroxyl Content | 18 wt% |
| Butyral Content | 80 wt% |
| Water Content | < 2 wt% |
| Solubility | Soluble in ethanol, methanol, isopropanol, and dichloromethane; insoluble in aliphatic hydrocarbons |
As an accredited Mowital B 16 H factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Mowital B 16 H is supplied as a free-flowing powder in 20 kg multi-layer paper bags, protected from moisture. |
| Container Loading (20′ FCL) | 20′ FCL: packed bags on pallets, secured for transit. Keep dry, ventilated, and protected from moisture and heat. |
| Shipping | Mowital B 16 H (polyvinyl butyral) is shipped as a non-hazardous, moisture-sensitive powder/granule. It is packed in sealed multi-layer bags or drums, protected from humidity and heat. Standard dry cargo transport is suitable; keep away from ignition sources and store in a cool, ventilated area. |
| Storage | Store Mowital B 16 H in its original, tightly closed container in a cool, dry, well-ventilated area. Protect from moisture, direct sunlight, and heat sources. Keep away from ignition sources and incompatible materials. Maintain moderate temperatures to prevent caking or degradation. Ensure containers are sealed when not in use to preserve product quality. |
| Shelf Life | Mowital B 16 H has a shelf life of at least 2 years when stored unopened, dry, and cool. |
On a steel pretreatment line, a two-component PVB-phosphoric acid wash primer containing Mowital B 16 H is prepared by dispersing the resin in anhydrous isopropanol–butanol at 7–10 wt% resin solids, then adding 85% phosphoric acid at a resin-to-acid weight ratio of 4:1 to 6:1, with methyl ethyl ketone introduced only after complete solvation. Compliance is governed by SSPC-Paint 27 for pre-construction primers and, where topcoated metal is placed in corrosive environments, ISO 12944-5:2019 Annex A; adhesion is verified after 24 h cure at 23±2 °C according to ISO 2409:2020 or ASTM D3359-17. The production process uses conventional air spray with 0.3–0.5 mm nozzle or air-assisted airless equipment with 0.28–0.33 mm nozzle, applying a wet-film thickness of 20–30 µm to yield a dry film of 5–10 µm; flash-off distance is limited to avoid acid condensation on the wet edge. Finished products are pretreated cold-rolled steel, galvanized steel, and aluminum substrates used under epoxy, polyurethane, and alkyd topcoats in industrial equipment, transportation, and architectural metal fabrication. The operational boundary is a closed-vessel pot life of 8–12 h and a minimum application temperature of 15 °C; at relative humidity above 70%, butanol-rich thinner adjustment is required to control blushing and prevent loss of the PVB-phosphate adhesion complex.
Multilayer ceramic capacitor tape casting uses Mowital B 16 H as the primary thermoplastic binder to control green sheet tensile strength, lamination integrity, and blanking edge quality before binder burnout. The standard dispersion is prepared in a planetary ball mill at 40–60 rpm with yttria-stabilized zirconia media of 2–3 mm diameter; the ceramic powder is first milled for 4–6 h in toluene–ethanol 60:40 w/w with menhaden fish oil or phosphate ester dispersant, then Mowital B 16 H is introduced at 3–8 parts by weight per 100 parts of barium titanate and milled for an additional 12–18 h. Plasticizer systems such as butyl benzyl phthalate or dioctyl phthalate are incorporated at 20–40 wt% relative to PVB solids to reduce glass transition and improve flexibility. Tape casting proceeds on a continuous doctor-blade line with a gap of 100–250 µm, a web speed of 0.4–1.5 m/min, and three-zone drying at 60 °C, 85 °C, and 110 °C; residual solvent is held below 2 wt% before blanking and screen-printing with nickel internal electrodes. Binder burnout in finished MLCCs is evaluated under the AEC-Q200 Rev E thermal stress schedule and the manufacturer’s TGA criterion, because residual carbon above 0.05 wt% shifts dissipation factor and may reduce insulation resistance; the burnout profile is staged at 230–260 °C under air for 2–4 h before sintering, but high molecular weight imposes a narrower ventilation window to avoid carbonization. Finished product types include X5R/X7R multilayer ceramic capacitors qualified under IEC 60384-22:2019, LTCC substrates, multilayer piezoelectric actuators, and alumina substrates for thick-film sensors.
For laminated safety glass interlayer sheet, Mowital B 16 H is dry-blended with a phthalate or non-phthalate plasticizer at 25–35 phr before extrusion; the resin is first conditioned to a moisture content below 0.4 wt% in a dehumidified hopper because residual water above 0.5 wt% forms bubble defects at the die lip. The compounded melt is processed on a co-rotating or counter-rotating twin-screw extruder with a length-to-diameter ratio of 30:1 to 42:1 and a slot die, using barrel temperatures of 170–210 °C and a melt temperature not exceeding 210 °C to avoid PVB degradation; the extruded web is embossed with a controlled surface roughness of 20–40 µm Rz and wound with interleaf. Compliance for automotive glazing is governed by ECE R43, ANSI Z26.1, and ISO 12543-2:2021; architectural laminated glass must satisfy EN 14449 and the relevant safety glazing classifications. Terminal finished products are automotive windshields, panoramic roofs, side laminates, and architectural safety glass in facades and balustrades. Edge stability is the main production constraint: long-term moisture ingress above 0.45 wt% under exposed edges can raise open-circuit haze and lower laminate adhesion, so extruded sheet is stored at 10–25 °C and 20–40% RH before lamination in a cleanroom autoclave at 120–140 °C and 1.0–1.5 MPa.
In alcohol-based gravure and flexographic printing inks for packaging, Mowital B 16 H functions as a co-binder with nitrocellulose and polyurethane to raise pigment affinity and film toughness on low-energy substrates. The standard addition is 3–6 wt% of the wet ink at 40–45% total solids, corresponding to roughly 12–20 wt% of the binder fraction; higher molecular weight increases solution viscosity and improves redissolution in successive print stations but requires a slower solvent blend of ethyl acetate and isopropanol with no more than 20 wt% n-propyl acetate to avoid viscosity collapse. Milling is conducted in a high-speed disperser at 15–20 m/s tip speed for 20–40 min followed by a bead mill with 0.6–0.8 mm zirconia media; letdown is adjusted to 20–24 s Zahn cup #2 at 25 °C for gravure cylinder coating. Regulatory compliance for printed food packaging is evaluated under EU Regulation 10/2011 for plastic materials and articles, and under FDA 21 CFR 175.300 for resinous and polymeric coatings used as food contact surfaces, subject to extraction limits in the respective food simulants. Terminal product types include surface-printed BOPP and PET films for snack and confectionery packaging, shrink sleeve labels, and lidding films. The operational boundary is poor compatibility with high-water formulations: aqueous phase above 10 wt% of solvent causes precipitation of the lower-solubility PVB grade and should be avoided unless a ketone coupling solvent is added.
A phenolic-PVB film adhesive formulated with Mowital B 16 H is applied as the matrix for aerospace honeycomb sandwich bonding; the adhesive film is manufactured by casting a methyl ethyl ketone solution containing 15–25 wt% PVB on release paper, followed by a 50–70 °C forced-air B-stage to remove residual solvent and achieve a controlled flow of 20–40%. During panel curing, the film adhesive is placed between aluminum or aramid honeycomb core and aluminum or composite face sheets, then processed in a vacuum bag or autoclave at 120–150 °C and 0.2–0.6 MPa for 60–120 min; the phenolic resin crosslinks while PVB contributes peel strength and film-forming control. Flammability compliance is evaluated under FAR 25.853(a) / 14 CFR Part 25, and peel strength is measured according to ASTM D1781 for climbing drum peel of sandwich core; production panels may also require traceability under AS9100 quality management. Terminal finished components are aircraft interior partitions, galley panels, ducting, and cargo bay liners. The main batch-to-batch risk is moisture pickup in the cast film during storage: if the adhesive film is not resealed with desiccant after use, absorbed water above 0.5 wt% can reduce phenolic-PVB interfacial adhesion and generate outgassing during cure; amine-based additives must also be avoided because they prematurely advance phenolic resin condensation at room temperature.
Heat-seal lacquers for pharmaceutical blister lidding often use Mowital B 16 H as a polar adhesion promoter in vinyl resin and acrylic systems because it maintains hot-tack and seal strength through extended dwell at sealing temperatures. The formulation incorporates Mowital B 16 H at 5–12 wt% of dry coating solids, dissolved in methyl ethyl ketone–toluene 60:40 w/w at 25–35% solids; this balances seal onset at 130–150 °C against blocking resistance on the coated roll. The coating is applied to pre-primed 20–25 µm aluminum foil by reverse gravure at 80–120 m/min and dried in a three-zone oven between 80 °C and 150 °C to a coating weight of 5–8 g/m²; the coated foil is then slit and converted into lidding stock. Compliance for pharmaceutical packaging is evaluated under EU Regulation 10/2011 for plastic materials in contact with medicinal product packaging, FDA 21 CFR 177.1200 for closures with sealing gaskets, and European Pharmacopoeia 3.2.1 for extractable tests where applicable. Terminal products are peelable lidding foil for tablet and capsule blister packs, diagnostic reagent lids, and dairy portion cup lids. The main incompatibility is with nitrocellulose-based primers in high-acid systems: residual acid can catalyze PVB acetal ring opening under prolonged storage at 40 °C and reduce bond strength.
Competitive Mowital B 16 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!
Kuraray’s Mowital B 16 H is a thermoplastic polyvinyl butyral resin supplied as a white granular powder. The polymer is produced by acetalization of polyvinyl alcohol with n-butyraldehyde, yielding a chain containing vinyl butyral, residual vinyl alcohol, and residual vinyl acetate segments. The residual alcohol concentration is the principal specification variable that distinguishes this grade from lower-hydroxyl PVB resins. Manufacturer data list a residual polyvinyl alcohol content of 18.0–21.0 wt% and a residual polyvinyl acetate content of 1.0–4.0 wt% when tested according to ASTM D1396. A 10% solution in ethanol at 20 °C exhibits a dynamic viscosity of 15–25 mPa·s by DIN 53015. Non-volatile matter is specified at ≥ 97.5% per ISO 3251, ash content at ≤ 0.1% per ISO 3451-1, density at 1.10 g/cm³ per ISO 1183-1, and glass transition temperature at approximately 63 °C by ISO 11357-2.
The grade dissolves in oxygenated solvents such as ethanol, isopropanol, n-butanol, diacetone alcohol, methyl ethyl ketone, and cyclohexanone. It is not water-soluble and shows limited tolerance for aliphatic hydrocarbon dilution. Mixed solvent systems are common because the hydroxyl content raises the polar contribution to solubility behavior. In a coil-coating primer, a solvent blend may contain methyl ethyl ketone, toluene, and n-butanol; the aromatic component reduces cost and viscosity, while the alcohol maintains dissolution of the PVB. Production-scale mixing uses a high-speed dissolver or a planetary mixer. The resin is added slowly to the solvent under agitation rather than by reverse addition, because reverse addition can form gel lumps at the liquid surface. After solids incorporation, mixing continues until a homogeneous solution is obtained; the temperature is not normally raised above 50 °C because solvent loss and color development may occur.
Solution rheology on a coating line is temperature-sensitive. Ethanol-based ink vehicles containing B 16 H show a viscosity increase when ambient temperature drops below 20 °C; solvent addition rather than further resin is used to maintain press viscosity. Filtration through a 10–25 µm bag filter is normally applied to remove undispersed gel particles before spray, roller, or printing application. In high-solids solution processing, batch-to-batch viscosity drift is controlled by monitoring solvent loss and by Karl Fischer titration according to ISO 760 when water contamination is suspected. The viscosity specification itself refers to a single-point method under DIN 53015, but production conversion often requires additional cone-plate or rotational rheometry because the final formulated ion is non-Newtonian at high pigment loading.
The residual hydroxyl groups in Mowital B 16 H react with phenolic resins, melamine-formaldehyde resins, and isocyanate crosslinkers. In stoving finishes, hydroxyl-melamine condensation proceeds at 120–160 °C to increase solvent resistance and hardness; the required acid catalyst level depends on catalyst type, film thickness, and bake schedule. Isocyanate-crosslinked wash primers can cure at ambient temperature, but moisture in solvent or pigment can consume isocyanate. Because of the hydroxyl content, the powder is hygroscopic; stored powder exposed to relative humidity above 60% can absorb sufficient moisture to shift solution viscosity and reduce the effective isocyanate stoichiometry in two-component coatings. Additives with strong amine character should be screened before use in two-component isocyanate systems because amines accelerate isocyanate consumption at the expense of pot life. Amine-cured epoxy systems can also be sensitive; a pre-trial is required to confirm gel time and intercoat adhesion.
Mowital B 16 H is used as the film-forming binder in solvent-borne wash primers and etch primers for steel, galvanized steel, and aluminium. In these systems, the PVB carries anticorrosive pigments such as zinc chromate-zinc phosphate combinations and is crosslinked with a phenolic or epoxy component to build intercoat adhesion. The polar hydroxyl units interact with steel oxides and hydroxyl-rich pretreatment layers, which is why the 18.0–21.0 wt% hydroxyl range is relevant. Adhesion is tested on production lines according to ISO 2409 cross-cut classification or ASTM D3359; chemical resistance is commonly screened by ASTM D4752 double-rub testing. On a coil-coating line, the primer is applied by reverse roller or spray and dried to a thin film of 5–8 µm before topcoat application. Insufficient crosslinking of the primer appears as whitening and delamination after ISO 9227 neutral salt-spray exposure. Replacement of a lower-hydroxyl PVB grade with B 16 H in the same formulation increases demand for crosslinker; if the crosslinker amount is not raised accordingly, free hydroxyl groups remain and reduce water resistance.
In flexographic and gravure printing inks, B 16 H functions as the primary film-forming resin for lamination inks on corona-treated polyethylene terephthalate and polypropylene. The resin is dissolved in ethanol/ethyl acetate blends, and the solution is pigmented in a bead mill or three-roll mill. During high-speed transfer at 80–200 m/min, solvent evaporation from the anilox or engraved cylinder progressively increases the vehicle viscosity; printers compensate with solvent addition rather than further resin. The molecular-weight distribution of the grade affects solvent release and ink transfer. Compared with nitrocellulose-based inks, PVB-based vehicles show higher flexural toughness and better heat resistance during lamination, but they require stronger solvent power to maintain printability at low temperatures. Laboratory drawdowns on treated film are evaluated for lamination bond strength according to ASTM F88 or equivalent peel test; the measured values are formulation-dependent. Published data for the specific bond strength of B 16 H in laminated structures is limited; qualification is therefore conducted on the converter’s own film and adhesive combination.
Selection among Mowital B 14 S, B 16 H, and B 20 H is driven by the balance between solution viscosity, hydroxyl concentration, and compatibility with non-polar co-resins.
| Property | Mowital B 14 S | Mowital B 16 H | Mowital B 20 H |
|---|---|---|---|
| Residual polyvinyl alcohol (wt%) | 14–18 | 18–21 | 18–21 |
| Dynamic viscosity of 10% ethanol solution at 20 °C (mPa·s) | 10–15 | 15–25 | 20–30 |
| Main formulation consequence | Lower hydroxyl content reduces hydrogen-bonding adhesion and moisture sensitivity. | Higher hydroxyl content increases adhesion to polar surfaces and crosslinking reactivity; mid-range solution viscosity suits spray and printing dilution. | Same hydroxyl range at higher molecular weight; higher viscosity requires more solvent, but film toughness may increase. |
B 14 S has a lower hydroxyl specification and is selected when improved solubility in less polar solvents and reduced water uptake are more important than maximum adhesion to metal or treated film. B 20 H shares the same hydroxyl specification as B 16 H but has a higher solution viscosity; it is selected where higher molecular weight contributes to toughness and extended open time, at the expense of higher solvent demand. B 16 H occupies the intermediate position: it delivers the same hydroxyl availability for crosslinking as B 20 H while retaining a lower solution viscosity for spray and high-speed printing operations. Replacement of B 14 S with B 16 H therefore requires a reformulation of the crosslinker level and solvent blend, not a simple drop-in substitution.
B 16 H is also employed as a thermoplastic binder in ceramic green-tape casting for multilayer ceramic capacitors and low-temperature co-fired ceramic substrates. The resin is dissolved in a solvent blend with plasticizer and dispersant, then mixed with barium titanate, alumina, or glass-ceramic powders in a ball mill or high-shear mixer. Tape casting uses a doctor blade gap of 100–250 µm; after solvent evaporation, the green tape contains PVB binder at levels typically between 5 and 12 wt% of the inorganic solids. The binder must maintain flexibility during punching and screen printing while burning out cleanly during the sintering ramp. The ash specification of ≤ 0.1% by ISO 3451-1 is relevant because residual inorganic matter can lodge at grain boundaries and reduce the dielectric performance of the fired ceramic. Thermal debinding profiles use a slow ramp between 250 °C and 450 °C to allow oxidative decomposition of the PVB without delamination or carbon residue. Slurry rheology is controlled by measuring apparent viscosity at 25 °C; values fluctuate with binder concentration, solvent loss, and adsorption on the powder surface. Because higher molecular weight and hydroxyl content increase green strength but also increase the risk of carbon residue, B 16 H is preferred over lower-hydroxyl PVB where green tape handling strength and clean burnout are both required.
Powder handling requires moisture control. The grade is hygroscopic and absorbs water vapor above 60% relative humidity; pre-drying at 50–60 °C for 4–6 h is used when the resin has been stored in opened sacks or humid climates before moisture-sensitive coating or adhesive compounding. In solution preparation, water contamination can cause turbidity and increase viscosity irregularity; ester and ketone solvents should be checked for water content by ISO 760 if performance defects occur. The powder is combustible as an organic dust; processing equipment should be grounded and operated with dust extraction designed for solvent-laden atmospheres. Published data for explosion severity of this specific grade is limited, but dust explosion testing under ISO 6184-1 or equivalent is applied to the finished powder handling system.
The base resin is a synthetic thermoplastic polymer with no intentionally added plasticizer or solvent; the regulatory status of the product is governed by regional chemical inventories and the specific end-use regulation. Mowital grades are listed under the applicable chemical inventories for industrial use, including EU REACH registration, and may be checked against RoHS Directive 2011/65/EU requirements for restricted substances. Food-contact use is not automatically conferred by the base resin composition; formulations intended for food packaging adhesives or coatings must be evaluated according to the appropriate framework, such as FDA 21 CFR 175.105 for adhesives or 21 CFR 177.1670 where applicable, with migration testing under EU Regulation 10/2011 for plastics intended for contact with food. The residual polyvinyl acetate and polyvinyl alcohol units are not the main regulatory limiting factors; the final coating’s compliance depends on solvents, crosslinkers, pigments, and reaction by-products. For applications requiring low extractable content, additional purification or solvent selection may be necessary. Published data for specific overall migration of Mowital B 16 H in food-contact articles is limited; end-users must obtain compliance data from the formulation supplier or conduct testing on the finished article.
