| HS Code | 270625 |
| Product Name | Mowital B 30 HH |
| Chemical Family | Polyvinyl butyral (PVB) |
| Physical Form | White, free-flowing granular powder |
| Molecular Weight | Approximately 30,000 g/mol |
| Density | 1.10 g/cm³ |
| Hydroxyl Content | 18.0 - 20.0 wt% |
| Butyral Content | About 80 wt% |
| Acetyl Content | About 1 wt% |
| Glass Transition Temperature | 68 - 78 °C |
| Viscosity | About 30 mPa·s in 5% ethanol solution at 20 °C |
| Tensile Strength | Approximately 35 MPa |
| Elongation At Break | Approximately 110% |
| Solubility | Soluble in ethanol, methanol, and certain ketones |
As an accredited Mowital B 30 HH factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Mowital B 30 HH is supplied as granular polyvinyl butyral in 20 kg multi-ply paper bags with a polyethylene liner. |
| Container Loading (20′ FCL) | Mowital B 30 HH is packed in 25 kg bags on pallets, securely loaded into a 20′ FCL container. |
| Shipping | Mowital B 30 HH (polyvinyl butyral resin) is supplied as a free-flowing white powder in moisture-protective multi-layer paper bags or drums. It is not classified as dangerous goods for transport by road, rail, or sea. Protect from moisture, heat, and direct sunlight; store below 30°C in dry, ventilated conditions. |
| Storage | Store Mowital B 30 HH in its original, tightly closed container in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep protected from moisture and humidity to prevent caking or degradation. Avoid stacking heavy loads on bags. Under proper conditions, shelf life is typically several years. |
| Shelf Life | Shelf life is approximately 2 years when stored unopened in original containers in a cool, dry place. |
The two-component metal pretreatment primer commonly referred to as an etch primer or wash primer represents the most extensively documented downstream route for high-molecular-weight polyvinyl butyral such as Mowital B 30 HH. In a solvent-borne formulation split into Part A and Part B before line-side mixing, Part A comprises 6.0–8.5 wt% PVB resin dissolved in a solvent blend of xylene, n-butanol, and isopropanol at an approximate 3:1:1 weight ratio, together with 0.3–0.8 wt% of a zinc tetroxychromate or strontium chromate anticorrosive pigment, where directly authorised under REACH Annex XIV and local occupational exposure limits, or a chrome-free zinc phosphate substitute, plus a small quantity of talc or barite extender; Part B contains phosphoric acid in an alcohol-water carrier at 10–30 wt% concentration. The acid-to-resin ratio is adjusted to keep the final acid value of the ready-to-spray mixture within 8–14 mg KOH/g relative to non-volatile content, because excess free acid below a cured dry film thickness of 8 μm produces intercoat adhesion failure on hot-dip galvanized substrates, while insufficient acid yields poor wetting on aluminium oxide surfaces. After spray application at 15–25 μm wet film thickness, the primer is force-dried at 60–80 °C for 10–15 min or air-dried for 2–4 h to achieve a dry film thickness of 6–10 μm; the PVB matrix embeds phosphate reaction products at the metal interface and creates a tie layer for subsequent epoxy, polyurethane, or alkyd topcoats. Adhesion is commonly qualified by cross-cut testing in accordance with ISO 2409:2020 on grit-blasted steel panels, with acceptance at class 1 or better, and by pull-off testing according to ISO 4624:2016 where fracture must occur cohesively in the primer above 8 MPa rather than adhesively at the zinc-primer boundary. Salt spray resistance of a complete 120–160 μm topcoat system incorporating the wash primer is assessed under ISO 9227:2017 for 500–1000 h with scribe creep values below 2 mm for C3/C4 corrosivity environments specified in ISO 12944-5:2019. Operational boundaries include the need to avoid formulating with strong Lewis bases such as triethylamine or dimethyl ethanolamine at levels above 0.1 wt% of total formula because partial salification of phosphoric acid blocks adhesion development on cold-rolled steel; similarly, the two components must not be premixed more than 8 h before application due to viscosity drift caused by PVB acetal ring hydrolysis under prolonged acidic conditions.
Multilayer ceramic capacitor green tape production consumes high-molecular-weight PVB as the primary thermoplastic binder because of its narrow thermal decomposition profile between 180 °C and 220 °C and low residual carbon after air burnout at 350–450 °C. Mowital B 30 HH is dispersed in a non-aqueous slurry containing barium titanate powder with a surface area of 2.5–3.5 m²/g, a phthalate-free plasticizer such as dioctyl adipate or benzoflex at 2–5 wt% of ceramic solids, and a binary solvent system of ethanol and toluene in a 70:30 to 80:20 weight ratio. The binder level is typically 8–12 wt% of ceramic solids, because lower concentrations reduce green tape tensile strength below the 1.5–2.5 MPa needed for roll handling, while higher concentrations raise slurry viscosity above 3500 mPa·s at 25 °C and create drying defects. Slurry preparation uses a three-roll mill or high-shear dissolver with a tip speed of 8–12 m/s for 30–45 min, followed by vacuum deaeration at 50–100 mbar to remove microvoids that otherwise cause pinholes during tape casting on a doctor blade line with a gap setting of 150–300 μm. The cast tape is dried at 50–70 °C in a three-zone dryer to a residual solvent content below 1.5% by weight; excessive residual toluene above 2% leads to blocking when the tape is wound with an interleaving polyethylene terephthalate liner. Lamination is performed at 70–85 °C under 200–400 bar for 3–5 min, conditions that require a glass transition temperature of the plasticized PVB in the range of 45–55 °C to permit adequate layer fusion without component delamination. Burnout of the binder stack is programmed with a first ramp of 0.5–1.0 °C/min from 25 °C to 220 °C, followed by a second ramp of 1.5–2.5 °C/min to 450 °C under flowing air at 10–20 L/min, because rapid gas evolution above 220 °C blisters the laminated green body. The relevant process controls are not governed by a single ISO standard; instead, internal ceramic foundry specifications and raw-material certificates govern impurity levels, with sodium and potassium each limited to less than 10 ppm in the final binder vehicle to prevent dielectric loss after co-firing with nickel internal electrodes. Mowital B 30 HH grades with lower residual acetate show reduced ash mass after decomposition, but published data for this specific configuration is limited; therefore the relationship between acetate end-group concentration and final carbon residue should be confirmed on the target barium titanate lot using thermogravimetric analysis at 10 °C/min in air to 600 °C.
Solvent-borne gravure inks for surface-printed polyolefin films use a ternary binder system in which high-molecular-weight PVB is blended with 20–30 wt% nitrocellulose and 5–10 wt% ketonic or polyurethane resin based on total non-volatile content. Mowital B 30 HH elevates pigment wetting and adhesion to corona-treated low-density polyethylene at surface energies of 38–42 dyn/cm; at addition levels below 3 wt% of the liquid ink, scratch resistance as measured by a Sheen model 705 motorized scratch tester falls below 70% of the reference system, while addition above 9 wt% extends drying time and increases solvent retention above 10 mg/m² as measured by headspace gas chromatography. Ink makers pre-dissolve the PVB in ethyl acetate or a 90:10 ethyl acetate/isopropanol blend under high-shear mixing at 40–50 °C to a 25% solids mother solution before letdown into the millbase; direct dry addition into the pigment dispersion produces undissolved gel particles that block the 30–40 μm gravure cell depths and cause missing dots. The finished ink is specified at 18–25 s efflux time in a DIN 53211 4 mm flow cup and adjusted to 25–30 s at press viscosity using ethyl acetate; at this viscosity, the ink transfers cleanly from a laser-engraved ceramic anilox roll with 80–120 L/cm screen ruling in flexographic units. Lamination bond strength of printed polypropylene to a polyethylene sealant adhesive layer after polyurethane adhesive application is specified at 1.0–2.5 N/15 mm under ISO 11339:2022 after 24 h at 23 °C and 50% RH; PVB levels in the surface print must remain below 5% of total solids to avoid plasticizer migration into the adhesive and a drop in seal strength below 0.8 N/15 mm. For food packaging, the final ink formulation must comply with EU Regulation 10/2011 as amended by (EU) 2020/1245, with total migration below 10 mg/dm² under simulant D2 for oils and fatty foods, and with FDA 21 CFR 175.300 for the resinous binder fraction. No amine-based adhesion promoters should be introduced into the ink at levels higher than 0.2% because they catalyse PVB acetal hydrolysis and increase odour generation from free butyraldehyde during high-temperature lamination.
Aluminium foil lidding structures for PVC/PVDC blister cavities are coated with a heat-seal lacquer in which PVB serves as the primary film former and adhesion promoter to aluminium, with a typical dry coating weight of 6–10 g/m² applied by reverse-roll or gravure coating at 120–160 m/min. The lacquer is formulated from 18–26 wt% PVB, 3–6 wt% of an epoxidized soybean oil or acetyl tributyl citrate plasticizer, and a hydrocarbon-ester solvent blend, optionally with 2–4 wt% of a polyamide or ethylene-vinyl acetate wax to adjust hot-tack. After drying in a multi-zone oven at 60–90 °C, the coated foil is slit and heat-sealed to rigid PVC at 150–180 °C under 0.3–0.6 MPa for 0.5–1.5 s. Seal strength on a 25-mm wide specimen is evaluated according to ASTM F88/F88M-22 and must exceed 5 N/25 mm for child-resistant pharmaceutical packages, with failure occurring by cohesive tearing of the PVC rather than adhesive transfer from the coated foil. Mowital B 30 HH provides higher heat-seal onset than low-viscosity PVB grades; thermomechanical analysis at 10 °C/min with a 0.1 N penetration probe shows softening onset between 110 °C and 130 °C for plasticised films cast from resin solutions, placing the sealing window above the glass transition temperature but below the thermal degradation threshold of the PVC substrate. The lacquer must be formulated without free phenol or epoxy resin hardeners because leachables from the coating are tested under EU Regulation 10/2011 and USP <1664> for inhalable or oral pharmaceutical packaging; total extractables must remain below 50 mg per 10 dm² of foil in 95% ethanol at 40 °C for 10 days. A further operational limitation is the incompatibility of PVB with water-based polyvinyl acetate dispersions; attempts to blend more than 10 wt% of a PVAc dispersion into the lacquer cause phase separation and a reduction in hot-tack force below 2 N on uncoated PVC. The lacquer-coated foil is also subjected to accelerated aging at 40 °C and 75% RH for 6 months, after which seal strength must remain above 4 N/25 mm and no delamination is permitted under ISO 4624:2016 pull-off testing.
Conductive silver or silver-coated copper pastes for screen printing onto automotive rear-window heater grids and antenna lines use PVB as a temporary binder, as it depolymerizes at a controlled rate during firing while holding glass frit and metal particles in suspension. In a typical paste, Mowital B 30 HH is dissolved at 6–10 wt% in a solvent blend of diethylene glycol monobutyl ether and terpineol; silver flake with a tap density of 1.2–2.0 g/cm³ is dispersed to 70–80 wt% metal content, and a lead-free bismuth borosilicate glass frit at 2–5 wt% serves as the inorganic adhesion phase. The paste viscosity is controlled to 35–60 Pa·s at 25 °C and a shear rate of 10 s⁻¹ using a cone-and-plate rheometer, because this range allows screen printing through a 200–280 mesh stainless steel screen without mesh clogging or slumping after print. After printing onto 4–5 mm tempered soda-lime glass, the part is dried at 120–150 °C for 10–15 min to remove solvent, then fired in an air convection furnace at 600–680 °C for 2–4 min; the PVB binder depolymerizes between 180 °C and 220 °C, and residual carbon must be below 0.05 wt% of the fired line to avoid a yellow-brown discoloration. The printed heater line resistance is specified by automotive original equipment manufacturers at 0.2–0.8 Ω per 10 cm length after firing, and adhesion is tested by a tape peel method derived from ASTM D3359-23 with no conductor loss permitted. Operational limitations include the requirement to select a PVB grade with low alkali content; sodium or potassium above 15 ppm in the paste solids increase the dielectric loss of the glass substrate and can reduce rear-window antenna gain by 1–2 dB in the 5.8 GHz band. Published data for this specific configuration is limited, so paste formulators typically verify the coefficient of thermal expansion mismatch between the glass frit and soda-lime substrate by dilatometry to avoid cracks under thermal cycling from -40 °C to 90 °C.
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Mowital B 30 HH, a polyvinyl butyral resin supplied by Kuraray, is produced by controlled acetalisation of polyvinyl alcohol with n-butyraldehyde; the dried product retains a defined residual hydroxyl fraction and a small acetate fraction. Those functional groups determine solubility in alcohol/ester solvent blends, pigment wetting, adhesion to polar substrates, and reactivity with isocyanate or melamine crosslinkers. The product is supplied as a white, free-flowing powder and is positioned in the medium-to-high solution-viscosity segment of the Mowital B range. Routine raw-resin characterisation is performed against DIN 53240 for hydroxyl value, DIN 53015 or ISO 2555 for solution viscosity, ISO 3251 for non-volatile content, and ISO 11357-2:2020 for glass transition temperature. Storage should be maintained below 30 °C and below 60 % RH, with re-sealing of opened containers; if moisture uptake exceeds 0.5 wt%, drying is required before use in anhydrous solvent blends or moisture-sensitive crosslinking systems. The resin dissolves in ethanol, ethyl acetate and methyl ethyl ketone, whereas aliphatic hydrocarbons function only as non-solvent diluents within the tolerance of the selected solvent mixture.
| Parameter | Method | Unit | Batch-release function |
|---|---|---|---|
| Hydroxyl value | DIN 53240 | mg KOH/g | Crosslinking and adhesion response |
| Solution viscosity | DIN 53015 or ISO 2555 | mPa·s | Molecular-weight and lot-consistency indication |
| Non-volatile matter | ISO 3251 | % | Packaging and drying behaviour |
| Glass transition temperature | ISO 11357-2:2020 | °C | Film hardness, blocking and melt behaviour |
The HH designation is primarily a viscosity and molecular-weight distinction. A 10 wt% solution of Mowital B 30 HH in ethanol at 25 °C generates a higher equilibrium viscosity than Mowital B 30 H, and the time required to reach a clear solution in low-shear mixing is longer. Published batch-release limits for this specific viscosity test are not reproduced here because they vary by regional certificate of analysis; current supplier documentation should be used for lot acceptance. In solventborne formulation work, the practical consequence is that Mowital B 30 HH cannot always be substituted one-for-one into a B 30 H formulation. When direct replacement is made without adjustment, press or spray viscosity rises, transfer efficiency falls, and film build may become difficult to control. To return to the original application viscosity, 5–15 % additional active solvent is commonly required, or the non-solvent diluent fraction must be reduced. The higher chain-length fraction in Mowital B 30 HH also increases film tensile properties and elastic recovery, but can reduce blocking resistance and extend open time. Published comparative data across all plasticiser and solvent combinations is limited; production-scale trials on the intended line are recommended before conversion.
In flexographic and gravure ink concentrates, the resin is introduced as a binder for pigment wetting, adhesion to treated polyester and aluminium foil, and lamination bond. High-shear predispersion is typically performed in a closed dissolver with tip speeds between 15 and 25 m/s; the temperature is maintained below the boiling point of the lowest-boiling solvent. For ethanol-rich blends, dispersion should not exceed 30 °C unless bottom-cooled vessels are used. After pigment grinding on a bead mill or three-roll mill, the concentrate is let down to press viscosity. On a rotogravure press, the ink is commonly diluted to an efflux time of 18–25 s in a 4 mm DIN cup at 20 °C; the target value is adjusted for cylinder engraving, line speed, doctor blade angle and substrate surface energy. At line speeds above 150 m/min, a higher-viscosity resin can increase misting and spattering; retarder solvent addition of 3–5 wt% is one control measure, but it also modifies drying behaviour. Laminating inks based on Mowital B 30 HH are tested after 24 h conditioning at 23 °C and 50 % RH according to ASTM F88; heat-seal strength above 2.5 N/15 mm is commonly obtained on corona-treated polyethylene terephthalate to aluminium foil structures, but the result depends on coating weight, adhesion promoter and film treatment. The resin is also used as a primer component where the substrate requires a polar anchoring layer before extrusion lamination.
Mowital B 30 HH exhibits a clear phase boundary when aliphatic or aromatic diluents are added to oxygenated solvent solutions. At 25–35 wt% resin solids in an ethanol/ethyl acetate mixture, the solution is homogeneous and suitable as a stock concentrate. As the diluent fraction increases, viscosity first declines, then rises sharply when the resin approaches its solubility limit; cloud point and aggregate formation follow. The exact non-solvent tolerance depends on the ester/alcohol ratio and the lot-specific molecular-weight distribution. For flexographic inks, the press-ready resin content is often reduced to 2–5 wt%; the solvent blend is adjusted so that the resin remains solvated at the doctor roll and anilox metering surface. Phase separation caused by excessive diluent can be reversed by adding ethyl acetate or methyl ethyl ketone and re-mixing under high-shear. In two-component primers, water content above 0.5 wt% in the solvent blend can cause haze and reduce shelf stability; molecular sieves or dehydrated solvents are used for long pot-life batches. Published Hansen solubility parameters for PVB resins are available, but the specific cloud-point curve for Mowital B 30 HH should be generated for each solvent blend because supplier-listed values may not cover mixed diluent systems.
In thin-film wash primers for carbon steel and aluminium, Mowital B 30 HH is combined with phosphoric acid, zinc phosphate and optional phenolic or epoxy modifiers. The acid component etches the substrate and chemically locks the primer layer; the resin supplies adhesion and a flexible binder matrix. The system is normally supplied as a two-pack product because acidified PVB solutions have limited storage stability. After mixing, pot life at 20 °C is typically 6–8 h; viscosity rise and pigment settlement outside this window reduce application consistency. For spray application, a fluid nozzle of 1.2–1.4 mm and atomising pressure of 0.25–0.35 MPa are used to deposit a dry film thickness of 8–15 µm. Higher build increases the risk of acid entrapment and adhesion loss after overcoating. Compliance testing is commonly performed by ASTM B117 for salt spray resistance, ISO 2409 for cross-cut adhesion, and ISO 4624 for pull-off adhesion. On blast-cleaned steel, an approved topcoat system applied over the wash primer should control scribe creep below 2 mm after 250 h salt spray; direct pull-off values above 5 MPa are considered acceptable for many industrial specifications, but the exact acceptance limit belongs to the governing coating specification and should not be assumed. The resin should not be combined with amine-catalysed epoxy components without evaluating acid neutralisation; amine addition raises pH, destabilises the acid/resin complex and can cause gelling. Chromate-containing pigments are sometimes replaced by zinc phosphate or zinc borate; the final formulation must be revalidated because the inorganic phase influences the acid reaction rate and the wetting of steel surfaces.
Because the residual hydroxyl functionality of Mowital B 30 HH can react with melamine-formaldehyde and blocked isocyanate crosslinkers, the resin is also used in heat-curable primers and coatings where post-forming adhesion and stone-chip resistance are required. At stoving conditions of 140–160 °C for 20–30 min, the hydroxyl groups form a crosslinked network; acid catalyst levels above 0.5 wt% are seldom required and may accelerate hydrolysis of the acetal groups. In ceramic green tape casting, Mowital B 30 HH acts as a temporary binder for alumina or glass powders. The slurry is prepared with a solvent/plasticiser system and tape-cast on a carrier film; after drying, the green tape is fired according to a controlled burnout schedule. A heating ramp of 0.5–1.0 K/min in the region up to 450 °C is often used to avoid blistering and cracking of the unsintered layer. Compared with lower-viscosity PVB binders, the HH grade provides higher green strength but increases slurry viscosity; the ceramic solids loading may need to be reduced by 2–5 vol% to maintain the same casting viscosity. Published data for this specific ceramic configuration is limited; the optimal binder-to-plasticiser ratio and solvent blend should be determined experimentally using the actual powder surface area and particle-size distribution.
Mowital B 30 HH can be plasticised and converted into film or sheet when sufficient shear and temperature control are available. Plasticised PVB is processed on twin-screw extruders with moderate shear; melt temperatures should remain below 200 °C to limit thermal degradation of the acetal group. Higher-viscosity PVB grades generate higher torque and melt pressure than lower-viscosity grades at equal throughput. On a corotating twin-screw extruder with an L/D ratio of 40:1, plasticiser injection after the resin melting zone is common; the plasticiser ratio is determined by the desired glass transition temperature of the final film. The resin is predried to below 0.2 wt% moisture before extrusion because water causes surface defects and bubbles. At die temperatures of 170–190 °C, the melt is cast onto a chilled roll; edge instability and die-lip build-up are production bottlenecks that require periodic cleaning. Film properties are tested according to ISO 527-3 for tensile strength and elongation; tear strength is measured by ISO 6383-2. Published direct extrusion data for Mowital B 30 HH in safety-glass interlayer applications is limited; most PVB interlayer grades are specifically designed and may not correspond to raw resin B 30 HH.
For heat-seal coatings on aluminium foil, Mowital B 30 HH is applied from solution or dispersion and subsequently dried. The resin is combined with plasticiser and adhesion promoter; the dry coating is heat-activated at 120–160 °C and bonded to polyethylene, paperboard or polyvinyl chloride. Heat-seal strength is tested on a tensile tester after 24 h conditioning at 23 °C and 50 % RH according to ASTM F88. Coating weight is typically 3–8 g/m²; lower coating weights reduce seal strength while higher coating weights can increase blocking on rewind. Compared with ethylene vinyl acetate and acrylic heat-seal coatings, PVB provides adhesion to polar substrates and can be formulated with high pigment binding capacity, but its moisture sensitivity and plasticiser migration must be controlled. The final selection of Mowital B 30 HH over lower-viscosity grades depends on the coatability window of the coating line and the required hot-tack behaviour. On high-speed packaging lines exceeding 200 pouches/min, hot-tack force must be evaluated on the actual seal jaw design; laboratory heat-seal data does not transfer directly to vertical or horizontal form-fill-seal machines.
