| HS Code | 988668 |
| Product Name | Mowital B 60 T |
| Chemical Type | Polyvinyl Butyral (PVB) |
| Cas Number | 63148-65-2 |
| Appearance | White granular powder |
| Density | 1.1 g/cm³ |
| Bulk Density | 0.8 g/cm³ |
| Glass Transition Temperature | 70 °C |
| Viscosity 10 In Ethanol 20 C | 60 mPa·s |
| Hydroxyl Content | 21 % |
| Butyral Content | 72 % |
| Molecular Weight Mw | 60000 g/mol |
| Solubility | Soluble in alcohols, esters, ketones, and glycol ethers; insoluble in water and aliphatic hydrocarbons |
As an accredited Mowital B 60 T factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Mowital B 60 T is supplied as a free-flowing powder in 25 kg multi-layer paper bags, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | Mowital B 60 T loaded as 20′ FCL, palletized bags secured, container closed and sealed for safe transport. |
| Shipping | Mowital B 60 T is a polyvinyl butyral resin supplied as free-flowing granules. Ship in sealed, moisture-proof bags or drums to prevent clumping. Avoid dust generation and ignition sources; material can form combustible dust. Store dry, cool, and away from oxidizers. Standard non-hazardous freight applies, but protect from humidity and mechanical damage. |
| Storage | Store Mowital B 60 T in its original, unopened packaging in a cool, dry place away from direct sunlight, heat sources, and moisture. Keep containers tightly sealed to prevent water absorption and clumping. Avoid exposure to high humidity. Under these conditions, the material can typically be stored for an extended period without degradation. |
| Shelf Life | Shelf life of Mowital B 60 T is at least two years if stored unopened, cool and dry. |
On cold-rolled steel and aluminum conversion-coated substrates, a 5–8 µm wash primer film based on Mowital B 60 T is deposited as a corrosion-inhibiting tie layer between the substrate and a high-build epoxy or polyurethane topcoat. The resin is pre-dissolved at 25–30 wt% in an ethanol/2-butanol 70/30 blend using a Cowles dissolver at 500–1000 rpm; batch temperature is held below 30°C. Phosphoric acid is added slowly after the resin is fully dissolved because rapid acid addition causes localized PVB precipitation and seed-formation on the vessel wall. A chromate-free starting variant uses 7.5 wt% Mowital B 60 T, 2.0 wt% phosphoric acid 85%, 9.0 wt% zinc phosphate, 1.5 wt% talc, and 80.0 wt% solvent blend. The older chromate reference substitutes zinc tetroxychromate at 6.0–8.0 wt%; chromate-containing wash primers face REACH authorisation and downstream user restrictions, so many production lines have shifted to chromate-free alternatives.
| Component | Chromate-containing primer | Chromate-free primer |
|---|---|---|
| Mowital B 60 T | 7.5 wt% | 7.5 wt% |
| Phosphoric acid 85% | 1.8 wt% | 2.0 wt% |
| Zinc tetroxychromate | 6.5 wt% | 0 wt% |
| Zinc phosphate | 0 wt% | 9.0 wt% |
| Talc | 1.5 wt% | 1.5 wt% |
| Ethanol/2-butanol 70/30 | 82.7 wt% | 80.0 wt% |
The primer is sprayed with HVLP equipment using a 1.2–1.4 mm nozzle and 0.15–0.25 MPa atomizing pressure. Dry film thickness above 10 µm causes brittle interlayer fracture under topcoat stress. Flash-off is 10–15 min at 23°C and 50% RH. The topcoat must be applied within 24 h because phosphoric acid reactivity decays after longer ambient exposure. Adhesion is evaluated per ASTM D3359-17 method B; a 5B rating is expected on grit-swept hot-dip galvanized steel. Cross-cut adhesion per ISO 2409:2013 should fall at rating 0–1. Neutral salt spray performance per ISO 9227:2017 NSS is typically specified at 500–1000 h, depending on the topcoat chemistry. The terminal products are architectural cladding panels, railway car body components, and aluminium curtain-wall profiles.
Surface-printed snack packaging requires adhesion to 20–40 µm BOPP or cast PP films treated to 38–42 mN/m surface energy. Mowital B 60 T is compounded into high-speed flexo inks as a co-binder at 8–12 wt% of the liquid ink. A typical letdown comprises 8.0–12.0 wt% PVB, 6.0–9.0 wt% nitrocellulose, 3.0–5.0 wt% polyurethane, 1.0–2.0 wt% dibutyl phthalate, 0.5–1.0 wt% polyethylene wax, 15–20 wt% pigment dispersion, and ethyl acetate/isopropanol 70/30 as diluent. The pigment predispersion is milled in a horizontal bead mill with 0.8–1.2 mm yttria-stabilized zirconia media at 60–70% chamber fill. Ink viscosity at 25°C is controlled to 40–70 mPa·s using ISO 2431:2020 outflow cup #3, equivalent to 18–25 s. Printing uses a ceramic anilox roll at 400–600 lpi and a chambered doctor blade at 150–250 m/min. Web drying is set at 50–70°C with air velocity 15–25 m/s. PVB raises adhesion on treated polyolefin but reduces water resistance; nitrocellulose content above 9 wt% rebalances water resistance but increases reel blocking. Adhesion is checked with ASTM F2252-13(2018) tape peel; ink removal below 90% on BOPP is treated as a batch failure. The PVB/NC ratio is maintained between 0.8:1 and 1.5:1. Ratio excursions outside this window produce either poor film adhesion or unacceptable blocking after 24 h stack storage at 40°C. The grade is not recommended as the sole binder in water-based inks because Mowital B 60 T is water-insoluble. Terminal products are snack wrappers, bread bags, and pressure-sensitive label face stock.
For low-temperature co-fired ceramic and multilayer ceramic capacitor tape, Mowital B 60 T functions as a temporary organic binder in solvent-based tape casting. The slurry is formulated in a two-stage ball milling sequence. The first stage disperses 100 phr ceramic powder, 0.5–1.5 phr fish oil or phosphate ester dispersant, and an ethanol/toluene 60/40 solvent blend with 3 mm zirconia media for 12–24 h. The second stage adds 6–10 phr Mowital B 60 T, 2–4 phr benzyl butyl phthalate plasticizer, and additional solvent; milling continues for 4–6 h. The slurry is de-aired under vacuum at residual pressure 10–20 kPa and cast through a doctor blade gap of 100–500 µm onto silicone-coated PET carrier film. Drying at 25–60°C yields green tape with residual solvent below 0.2 wt%. Lamination of printed layers is carried out at 60–75°C and 15–25 MPa for 10–20 min. Burnout requires a two-stage ramp: 0.5°C/min to 250°C with 2 h hold, followed by 1.0°C/min to 450°C with 2 h hold in flowing air. Ramp rates above 2°C/min generate carbon residues and delamination at the ceramic-binder interface. Published data for this specific Mowital B 60 T configuration is limited; the 6–10 phr PVB binder range is common for PVB tape casting on production lines. Benzyl butyl phthalate triggers REACH Candidate List communication duties under Article 33 when the finished green tape contains more than 0.1 wt% of that plasticizer. Terminal products are MLCC dielectric layers, LTCC substrates, and alumina sensor substrates.
Heat-seal lacquers for PVC, PVDC, and PET lidding use 15–25 wt% Mowital B 60 T dissolved in ethyl acetate/ethanol 80/20. The lacquer is compounded with 5–8 wt% dioctyl adipate or dibutyl sebacate as plasticizer, 0.5–1.0 wt% fumed silica as anti-block, and 0.2–0.5 wt% erucamide slip additive. Gravure coating on 20–25 µm aluminium foil deposits 4–8 g/m² dry film. The coated foil is dried in an air flotation dryer with peak web temperature 120–180°C and residence time 5–15 s. Seal initiation occurs at 140–150°C; production sealing runs at 160–190°C with 0.5–1.5 s dwell and 0.4–0.6 MPa jaw pressure. Below 140°C, cohesive failure of the lacquer leaves visible residue on the tray rim. Above 190°C, foil deformation and plasticizer volatilization reduce seal strength and may generate pinholes. Seal strength measured by ASTM F88/F88M-21 is typically specified at 8–15 N/15 mm for lidding to PVC/PVDC blister. Food-contact compliance is evaluated under EU Regulation (EU) No 10/2011 using EN 1186-1:2002 total migration; FDA 21 CFR 175.300 is applied in some North American converter specifications. Blocking stability is tested after 24 h at 40°C under 1 kPa stack pressure. Reel blocking is the main production bottleneck when storage exceeds 30°C because plasticizer migration softens the coated foil backside. Terminal products are dairy cup lidding, pharmaceutical blister lidding, and condiment portion packs.
Crosslinked PVB adhesives bond glass to metal frames and steel panels to wood cores. The adhesive base consists of 18–25 wt% Mowital B 60 T, 8–12 wt% phenolic resol, 0.5–1.0 wt% gamma-glycidoxypropyltrimethoxysilane, and ethanol/methyl ethyl ketone 60/40. The mixture is roll-coated onto degreased, abraded aluminum at 30–50 µm wet film thickness. After open time of 5–10 min at 23°C, the parts are assembled and cured at 150–180°C for 10–20 min under 0.2–0.5 MPa. Lap shear per ASTM D1002-10(2019) on chromic-acid anodized aluminium typically falls in 12–20 MPa after 160°C cure. ISO 4587:2003 specimens show cohesive failure within the PVB phase rather than interfacial detachment. Amine-based catalysts and ketimine curatives cause premature gelation in the pot and are excluded from the formulation. Pot life at 25°C in a closed container is 8–12 h. The adhesive has a sustained-load service boundary of -20°C to 80°C; above 80°C the thermoplastic PVB phase creeps under shear. Terminal products are structural glazing spacers, laminated metal-panel edge bonding, and loudspeaker voice-coil bonding.
Optical glass and precision sheet glass are protected during grinding, polishing, and transport by a removable PVB mask prepared from 10–15 wt% Mowital B 60 T, 2–4 wt% dibutyl sebacate, and ethanol. Dip coating or air-assisted spray applies 5–15 µm dry film. The film is water-insoluble but dissolves rapidly in ethanol or isopropanol after processing. Peel initiation at the edge is deliberate; peel strength below 2 N/25 mm prevents surface damage, while values below 0.3 N/25 mm are rejected because the mask detaches during handling. The coating protects optical surfaces against 50% RH humidity and mild acid fumes in grinding workshops. Long-term storage beyond 6 months under UV exposure causes yellowing and peel-strength increase. The grade is selected because it does not leave siloxane residue, unlike silicone release masks. Terminal products are optical lens grinding, touch-panel glass handling, and decorative glass sandblasting.
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Mowital B 60 T, a solvent-soluble polyvinyl butyral resin supplied by Kuraray, is an acetal resin formed from polyvinyl alcohol and n-butyraldehyde. The product is a non-ionic, non-plasticized white powder with CAS registry number 63148-65-2. The molecular structure contains polyvinyl butyral segments, residual hydroxyl groups from incomplete acetalization, and a small proportion of residual acetate groups. The residual hydroxyl functionality controls adhesion to polar substrates, solvation in hydrogen-bonding solvents, and reactivity with crosslinkers such as phenolic resoles and isocyanates. The residual acetate content influences compatibility with plasticizers and certain coating additives.
The manufacturer’s published specification lists residual polyvinyl alcohol at 20–23 wt% and residual polyvinyl acetate at 2–4 wt% as determined by DIN 53401. A 10 wt% solution in 95 vol% ethanol exhibits a viscosity of 70–110 mPa·s at 20 °C according to DIN 53015. The glass transition temperature is approximately 69 °C by differential scanning calorimetry. The acid number is below 1 mg KOH/g by DIN 53402. Typical density is 1.10 g/cm³ at 25 °C by ISO 1183.
Solubility is limited to polar and partially polar solvent systems. The resin dissolves in ethanol, isopropanol, methyl ethyl ketone, ethyl acetate, and selected glycol ethers. It is insoluble in water and aliphatic hydrocarbons. Mixed solvent systems containing aliphatic hydrocarbons must be checked by cloud-point titration because resin precipitation occurs when the solvent blend moves outside the compatible solubility-parameter window. Because the hydroxyl groups are hygroscopic, powder stored above 60 % relative humidity should be pre-dried at 60–70 °C for 2–4 h before dissolution. Drying above 80 °C can cause particle sintering and should be avoided.
In the solvent-soluble PVB series, Mowital B 60 T occupies a high-molecular-weight position. The principal differentiator is solution viscosity at equal resin concentration. The 10 wt% ethanol solution viscosity of 70–110 mPa·s requires lower solids loadings than lower-viscosity grades when a fixed application viscosity is required. Lower-molecular-weight PVB resins such as Mowital B 30 T or Mowital B 45 M are selected when higher binder solids at low viscosity are necessary; their films exhibit lower cohesive strength and lower resistance to cold flow. The choice is therefore a formulation trade-off between viscosity and film mechanical integrity.
After solvent evaporation, the longer chain length of B 60 T produces a denser entanglement network. The result is higher tensile strength, reduced cold flow under pressure, and improved block resistance in stacked printed or coated articles. The corresponding limitation is slower solvent release. In thick films, retained high-boiling solvent can reduce hardness development and create residual odor. In heat-sealable coatings, retained solvent can also shift heat-seal onset temperature.
| Parameter | Published range or typical value | Test basis |
|---|---|---|
| Residual polyvinyl alcohol | 20–23 wt% | DIN 53401 |
| Residual polyvinyl acetate | 2–4 wt% | DIN 53401 |
| Viscosity, 10 wt% in ethanol, 20 °C | 70–110 mPa·s | DIN 53015 |
| Glass transition temperature | approx. 69 °C | DSC |
| Acid number | max 1 mg KOH/g | DIN 53402 |
Heat-sealable overprint varnishes and lamination inks use Mowital B 60 T as a binder to provide adhesion to corona-treated polyolefin films and to contribute peelable heat-seal response. The resin is predissolved at 25–35 wt% solids in a solvent blend of ethanol, ethyl acetate, and propyl acetate. Dissolution is performed in high-shear dissolvers with a sawtooth impeller at tip speed 8–12 m/s. The powder is added slowly to the solvent vortex, and batch temperature is maintained below 40 °C to limit solvent loss and viscosity drift.
The resulting polymer solution is shear-thinning. Low-shear rotational viscosity is not identical to high-shear press viscosity; control is therefore based on both rotational viscosity and efflux cup time. On a rotational viscometer, spindle 3 at 60 rpm is used to monitor batch consistency, with typical finished varnish viscosity in the range 100–400 mPa·s at 25 °C. Actual values depend on pigment loading, solvent balance, and press speed.
Adhesion to polyolefin films requires corona discharge treatment maintained at 38–42 mN/m. Adhesion is measured by peel strength after lamination or by tape-pull test. Compared with nitrocellulose-based binders, PVB gives lower yellowing and better flexibility in heat-sealable coatings, but the high-viscosity grade requires careful retarder adjustment because the resin releases solvent more slowly. In gravure applications, high-boiling retarders such as propylene glycol monomethyl ether acetate are used only at low levels to avoid heat-seal onset suppression.
In metal pretreatment, Mowital B 60 T functions as the film-forming binder in two-component wash primers. A typical wash primer formulation contains the resin, a phenolic resole or polyisocyanate hardener, phosphoric acid, and a corrosion-inhibitive pigment. The residual hydroxyl groups of the PVB react with the hardener after solvent evaporation to form a crosslinked film. Dry film thickness is maintained at 8–12 µm; heavier films develop internal stress and show cross-cut adhesion loss under ISO 2409. The PVB layer acts as an adhesion bridge between the metal substrate and the subsequent topcoat while also contributing to the corrosion-inhibitive system.
Application viscosity for air-atomized wash primers is typically adjusted to 18–22 s in a DIN 4 cup at 20 °C. Phosphoric acid content is controlled in the region of 0.5–1.5 wt% of total formulation to activate the metal surface without causing excessive acid-catalyzed hydrolysis of the acetal linkage. Substrate preparation determines performance. On zinc-phosphated steel, a wash primer based on B 60 T at 10 µm dry film thickness has been shown in industrial qualification testing to withstand 168 h of neutral salt spray per ASTM B117 with less than 2 mm creep from the scribe. On untreated steel, published data for this specific configuration is limited; the value is highly dependent on surface condition, acid concentration, and topcoat compatibility.
Mowital B 60 T is not intended for melt compounding above 180 °C. Prolonged residence time at temperatures above 180 °C causes acetal ring opening, discoloration, and molecular-weight degradation. When the resin is used in extrusion laminating or hot-melt compounding, barrel temperature profiles should be limited and residence time minimized. The acetal linkage is also subject to hydrolysis in strong aqueous acid or alkali at elevated temperatures. The resin is therefore not specified for continuous immersion in aggressive chemical service without crosslinking and topcoating.
Regulatory classification is based on the manufacturer’s safety data sheet. The product is not classified as hazardous under CLP Regulation (EC) No 1272/2008. For indirect food-contact uses, the resin may be evaluated under FDA 21 CFR 175.105 for adhesives and 21 CFR 175.300 for resinous and polymeric coatings; suitability is end-application specific and depends on migration testing under the intended conditions of use.
