| HS Code | 192040 |
| Product Name | Mowital SB 70 HH |
| Chemical Family | Polyvinyl butyral (PVB) |
| Physical Form | White free-flowing powder |
| Viscosity 5 In Ethanol At 20 C | Approx. 70 mPa·s |
| Hydroxyl Content | Approx. 22.5% |
| Butyral Content | Approx. 76% |
| Acetyl Content | Approx. 1.5% |
| Density At 25 C | Approx. 1.08 g/cm³ |
| Glass Transition Temperature | Approx. 65–70°C |
| Solubility | Soluble in alcohols, ketones, esters, and glycol ethers; insoluble in water |
As an accredited Mowital SB 70 HH factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | Mowital SB 70 HH is supplied in 25 kg paper bags with polyethylene liners, palletized and shrink-wrapped for safe transport and storage. |
| Container Loading (20′ FCL) | Mowital SB 70 HH loaded in 20′ FCL: palletized bags, moisture-protected, secured, ventilated, labeled, with complete safety documentation. |
| Shipping | Mowital SB 70 HH, a polyvinyl butyral resin, ships as powder in multi-layer paper or polyethylene bags. Keep packaging sealed and protected from moisture during transit. Avoid generating dust; ground containers to prevent static. It is not a regulated hazardous material for transport, but standard industrial safety measures apply. |
| Storage | Store Mowital SB 70 HH in its original, tightly sealed container in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Protect from moisture and humidity, which can cause caking or degradation. Keep containers upright and avoid damage. Under these conditions, shelf life is typically maintained for several years. |
| Shelf Life | Shelf life is approximately 2 years when stored in original, unopened containers in a cool, dry place. |
In high-solids flexographic surface ink systems formulated for corona-treated low-density polyethylene film, dissolution of Mowital SB 70 HH at 8–10 wt% in an 80:20 ethanol:ethyl acetate solvent blend produces a shear-thinning vehicle whose flow time remains within 28–35 s when measured through a 4 mm cup according to ISO 2431:2019 at 23 °C. Pigment dispersion is carried out on a three-roll mill or a high-speed dissolver at 18–25 m/s tip speed with a binder-to-pigment ratio of 1:0.8 to 1:1.2, using surface-treated titanium dioxide or phthalocyanine blue; dispersion stability is checked on a Hegman gauge after 24 h storage, with the ground paste maintained below 5 µm fineness. The resulting ink is applied at 200–400 m/min on a central impression flexographic press equipped with anilox rollers of 400–800 L/cm and chambered doctor blades, with dry film weight controlled to 1.2–1.8 g/m². Adhesion after 48 h at 23 °C and 50% RH is evaluated by ISO 2409:2013 cross-cut on LDPE surface energy 38–42 mN/m; the panel achieves class 0 or 1, provided residual solvent is below 150 mg/m² as measured by headspace GC. Solvent resistance is checked with 50 double rubs of 70% ethanol/30% deionized water under 500 g load following ASTM D5402-19; film removal beyond 10% area is considered nonconforming. Compliance for food-contact packaging ink is converter-specific, but the finished print is typically certified against EU Regulation 10/2011 overall migration <10 mg/dm² and the Swiss Ordinance SR 817.023.21 for printing inks, while the resin falls under REACH Regulation (EC) No 1907/2006. Pre-drying of the PVB powder is unnecessary below 60% RH; if warehouse humidity exceeds 60% RH, the powder is dried at 50–60 °C for 2–4 h in a dehumidified hopper to prevent solvent cloudiness and anilox plugging. End products include snack-food bag surface print, bread bag print, and polyethylene carrier bag print where lamination is not required.
Part A of a two-component wash primer is manufactured by dissolving 6–9 wt% Mowital SB 70 HH in an 85:10:5 isopropanol:n-butanol:water solvent blend, followed by dispersion of 7–10 wt% zinc phosphate or zinc tetroxychromate and 1.5–2.5 wt% orthophosphoric acid 85%; the high hydroxyl functionality of the PVB grade binds the acid-containing pigment paste and buffers the etching activity on steel or galvanized substrates, producing a pigment paste fineness below 15 µm on a Hegman gauge and a spray viscosity of 18–25 s in ISO 2431:2019 4 mm cup. The primer is sprayed at 6–10 µm dry film thickness using airless spray equipment with fluid pressure 4–6 MPa and a 0.23–0.33 mm tip; pot life of the catalyzed mixture is 8 h at 23 °C when stored in a sealed pressure pot. Curing proceeds at ambient temperature and 50% RH for 7 days before salt spray evaluation. Neutral salt spray according to ISO 9227:2017 for 1,000 h on grit-blasted steel with 75–100 µm profile produces scribe creep of ≤2 mm and an ASTM D1654-08 procedure A rating of 7 or higher, provided the wash primer is overcoated within 24 h with an epoxy or polyurethane intermediate coat. The formulation is not suited to closed-loop pot circulation systems because acid-catalyzed PVB acetal cleavage gradually raises free butyraldehyde and reduces film cohesion after 12 h; published data for this specific grade under continuous circulation is limited. Do not dilute with ketones or esters above 5 wt% because the resin precipitates and solvent balance is lost; amine-based additives are excluded because neutralization of phosphoric acid shortens pot life to under 2 h. The end use is confined to pretreated structural steel components, galvanized ducting, and aluminium profiles where a thin conversion-adhesion layer is required before high-build protective coating systems.
Tape casting of X7R barium titanate dielectric layers for multilayer ceramic capacitors uses Mowital SB 70 HH at 10–14 parts by weight per 100 parts BaTiO₃ powder with a median particle size of 0.5–1.0 µm. The slurry is prepared in a planetary mixer at 15–25 rpm for 12–18 h with 4–6 parts dioctyl phthalate or benzyl butyl phthalate plasticizer, 1–2 parts phosphate ester dispersant, and a 60:40 methyl ethyl ketone:ethanol solvent system adjusted to 30–35 vol% solids. Viscosity at 10 s⁻¹ shear rate is maintained at 3,000–8,000 mPa·s; exceeding 8,000 mPa·s on a 75 mm planetary mixer at 15 rpm has been observed to entrap air and generate pinholes in the green tape, so solvent is added in 0.5 wt% increments to restore the target rheology. Casting is performed on a reusable polyester carrier with a doctor blade gap of 25–150 µm and speed 0.5–2.5 m/min through a three-zone dryer set at 25/40/60 °C; residual solvent after drying is held below 1.5 wt% by thermogravimetric analysis. The high molecular weight of the grade raises green tensile strength to a range of 6–10 MPa when measured at 23 °C and 50% RH on 50 µm unsupported film following ISO 527-3:2018, which permits automated blanking without edge cracking. Binder burnout during co-firing is performed with a ramp rate of 0.5–1.0 °C/min to 450 °C and a 2 h hold; the resulting ash residue is specified at <0.05 wt% because residual alkali metal oxides degrade capacitor insulation resistance. Lamination of stacked layers is performed at 70–85 °C and 10–20 MPa for 10–20 min; pressure above 25 MPa can force low-viscosity plasticizer migration and create layer thickness nonuniformity. Fired density is checked by the Archimedes method following ASTM C373-88; production-scale capacitor lots require a fired density of ≥5.85 g/cm³ and absence of internal delamination detectable by scanning acoustic microscopy at 25 MHz.
After corona treatment of the aluminium foil web to 42–46 mN/m, a heat-seal lacquer formulated with Mowital SB 70 HH and a melamine-formaldehyde crosslinker is applied at 8–12 g/m² wet coat weight on a 9-station gravure coating line running at 150 m/min. Oven zones are set to 80/100/120 °C with a final web temperature of 105–115 °C; the PVB binder provides metal-leafing resistance and retards pigment settlement, with pigment settlement after 72 h remaining below 2 mm supernatant in a 100 mL graduated cylinder when 0.2–0.5 wt% fumed silica anti-settling agent is incorporated. Seal activation on 25 µm foil against 250–300 µm rigid PVC blister sheet is performed at 170 °C for 1 s under 4 bar jaw pressure; heat-seal strength is measured according to ASTM F88/F88M-15 and falls within 6–9 N/15 mm for a pull speed of 300 mm/min. The structure is intended for pharmaceutical blister lidding and food-grade portion cups; compliance for the final lacquered foil is determined under FDA 21 CFR 175.300 for resinous and polymeric coatings and EU Regulation 10/2011 overall migration <10 mg/dm², provided the crosslinker and slip additives are selected from positive lists. The operational boundary for this grade is the limited compatibility with high-ketone gravure cylinder cleaning solvents; continuous exposure of the dried lacquer to acetone during wash-up produces swelling and adhesive failure on foil, so cylinder cleaning is performed with ethyl acetate or a 90:10 ethanol:ethyl acetate blend. End products include lidding foil for cold-form blister packs, portion cup lids, and tamper-evident seal membranes.
Addition of 5–10 wt% Mowital SB 70 HH based on total binder solids to a nitrocellulose/alkyd wood lacquer shifts the cold-check failure point from −5 °C to −20 °C in ASTM D1211-97(2016) cycling between −20 °C and 50 °C at 90% RH. The PVB is introduced as a pre-dissolved 15 wt% solution in an 80:20 ethyl acetate:isopropanol blend and mixed under low-shear agitation at 300–500 rpm to avoid nitrocellulose fiber formation. Spray application on laminated MDF or solid oak is performed with HVLP equipment at 2.0–3.0 bar atomizing pressure, with a wet-film thickness of 25–35 µm per coat and intermediate sanding with P320 abrasive. The high hydroxyl content of the PVB grade improves adhesion to sealed wood surfaces; cross-cut testing following ISO 2409:2013 on a two-coat system after 7 days at 23 °C and 50% RH gives class 0–1, while unlacquered controls may reach class 3 on the same substrate. Force drying at 50 °C for 30 min reduces blocking tendency and improves stackability in furniture production; however, at addition levels above 15 wt% the lacquer viscosity rises beyond 120 s in ISO 2431:2019 6 mm cup and solvent demand increases. The grade is not suitable for waterborne nitrocellulose dispersions; phase separation occurs when the co-solvent content falls below 20 wt%. End products include furniture clear coats, musical instrument lacquers, and industrial wood finishing where cyclic temperature resistance is specified.
For chopped E-glass strand mat bound with a powdered PVB size, Mowital SB 70 HH is applied at 3–6 wt% of mat weight as a dry binder after chopping and before mat formation; the binder is deposited through electrostatic spray heads onto wet fiber strands and then thermally fused at 110–130 °C in a through-air oven with dwell time 30–60 s. The high molecular weight of this grade increases mat tensile strength to 0.9–1.4 N/cm for a 450 g/m² mat when tested by ISO 3342:2011 after conditioning at 23 °C and 50% RH, while limiting fiber fly during chopper-gun use. In sheet molding compound compounding, the PVB-bound glass mat is compatible with unsaturated polyester and vinyl ester resins, but styrene solubility tests show partial dissolution of the sizing after 24 h immersion at 23 °C; published data for this specific binder configuration is limited, so qualified laminators confirm fiber wet-out and interlaminar shear strength before production. The binder content must not exceed 6 wt% because excess PVB contributes to degradation gas evolution and char during fire-retardant panel combustion tests to EN 45545-2; laminated panels requiring HL2 compliance generally specify lower smoke density and heat release rates, so the PVB size is restricted to non-structural interior panels unless verified by cone calorimetry according to ISO 5660-1:2015. End products include glass mat for translucent roofing panels, composite core mat, and preform production for RTM lightweighting.
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Mowital SB 70 HH is a polyvinyl butyral resin manufactured by Kuraray Europe GmbH and supplied as free-flowing white granules. The polymer is produced through acid-catalyzed acetalization of polyvinyl alcohol with n-butyraldehyde; the molecular structure retains controlled quantities of hydroxyl groups and acetate groups. Lot-typical specification ranges are 76–80 wt% polyvinyl butyral, 18–21 wt% residual polyvinyl alcohol, and 1–3 wt% residual polyvinyl acetate. The viscosity of a 10 wt% solution in ethanol at 20 °C is 60–80 mPa·s, determined with a Brookfield rotational viscometer at 20 rpm and reported according to DIN 53015. Non-volatile content by ISO 3251 at 105 °C for 1 h is not less than 97.5 wt%. Ash content by ISO 3451-1 is not more than 0.05 wt%. Acid number by ISO 2114 is not more than 0.1 mg KOH/g. Glass transition temperature by ISO 11357-2 DSC at 10 K/min is 68–72 °C. Density by ISO 1183-1 is 1.08–1.12 g/cm³. The resin is soluble in ethanol, methanol, methyl ethyl ketone, ethyl acetate, and butyl acetate; it is insoluble in water and aliphatic hydrocarbons. Storage above 35 °C or at relative humidity above 60% can cause caking and moisture uptake.
The HH suffix indicates that the resin possesses a higher residual polyvinyl alcohol fraction than standard H grades in the SB series. This raises the density of available hydroxyl groups for hydrogen bonding with metal oxides and for condensation reactions with melamine, phenolic, epoxy, and isocyanate crosslinkers. Based on the 18–21 wt% polyvinyl alcohol content, the theoretical hydroxyl concentration is 4.0–4.7 mmol OH/g; this is an upper limit because acetal rings and intramolecular hydrogen bonds reduce accessibility. In a baked wash primer cured at 150–180 °C for 15–20 min, the system can resist 100 methyl ethyl ketone double rubs on iron phosphate-treated steel, but published data for the exact crosslink density of SB 70 HH in this specific configuration is limited. The same hydroxyl fraction creates moisture sensitivity; films cast at relative humidity above 60% may show blushing and reduced adhesion unless 2–5 wt% diacetone alcohol on resin solids is added to the solvent blend. Primary amine-functional silanes at loads above 0.5 wt% on resin solids can accelerate viscosity build in one-pack systems; such formulations require moisture-controlled storage and periodic viscosity measurement.
Mowital SB 70 HH is used as a binder in etch primers and wash primers for steel and aluminum. In a production-scale dissolver with tip speed of 8–12 m/s, the granules are pre-wetted in a solvent mixture of methyl ethyl ketone, isopropanol, and toluene at 7–9 wt% resin solids; batch temperature is held below 40 °C to prevent solvent loss. Phosphoric acid at 0.5–1.0 wt% of total batch is added only after complete dissolution, and the primer is filtered through a 30 μm bag filter. On degreased cold-rolled steel, ISO 2409 cross-cut adhesion after 24 h at 23 °C is class 0–1; pull-off adhesion by ISO 4624 can exceed 5 MPa at 20–25 μm dry film thickness. The acidified primer has a storage stability of 6–12 months; acid number and viscosity should be rechecked after prolonged storage because phosphoric acid can slowly hydrolyze residual acetate groups.
Flexographic and gravure ink applications use Mowital SB 70 HH as a co-binder for corona-treated polyethylene terephthalate and oriented polypropylene. A letdown binder is prepared with 20–25 wt% PVB resin, 50–55 wt% ethanol, 20–25 wt% ethyl acetate, and 2–3 wt% of a polymeric plasticizer; final ink viscosity is adjusted to 18–25 s on a DIN 53211 flow cup at 23 °C. The resin is compatible with nitrocellulose and polyurethane co-binders within the alcohol/ester solvent window. On a water-cooled three-roll mill operated at 20–30 °C roll temperature, pigment concentrates based on SB 70 HH show lower shear heat than higher-viscosity PVB grades; at pigment loading below 30 wt%, the paste remains pourable. Above 30 wt%, tack increases and requires water cooling to maintain roll temperature below 35 °C. Lamination bond strength on corona-treated polyethylene terephthalate following a standard polyurethane adhesive lamination step is not determined by the ink binder alone; published data for the specific SB 70 HH grade in this full laminate construction is limited.
In two-component high-solids coatings, the polyol character of SB 70 HH is combined with aliphatic polyisocyanates at an NCO:OH ratio of 1.1:1 to 1.3:1. The pot life at 23 °C in butyl acetate is 3–6 h, defined by doubling of mixed viscosity; at 40 °C the interval shortens to 60–90 min. Cure at 80 °C for 30 min or at 23 °C for 7 days produces a crosslinked network with greater solvent resistance than thermoplastic PVB films. The high hydroxyl content consumes more isocyanate than low-hydroxyl PVB grades; formulators must calculate isocyanate demand from the 4.0–4.7 mmol OH/g theoretical hydroxyl concentration and correct for resin moisture. Films cured below 10 °C exhibit incomplete reaction and reduced hardness; forced air circulation at 80 °C is recommended for metal substrates. Viscosity during the first 2 h does not indicate full pot life because the molecular weight builds before gelation; production lines should monitor at 60 min intervals.
In ceramic tape casting, Mowital SB 70 HH functions as a high-green-strength binder for alumina and barium titanate layers. A slurry containing 55–60 wt% ceramic powder, 10–14 wt% PVB resin, 2–4 wt% dibutyl phthalate, and the balance an ethanol/toluene azeotrope is mixed in a planetary mixer under vacuum. Deaeration is performed at 50–100 mbar for 20–30 min to prevent pinholes. Tape is cast at 0.10–0.25 mm wet thickness and dried at 60 °C; residual solvent below 0.5 wt% is required before punching or stacking, determined by thermogravimetric analysis at 150 °C to constant mass. Binder burnout before sintering is performed by heating from 250 °C to 450 °C at 1–2 K/min; published data for the specific carbon residue of SB 70 HH in this configuration is limited, and kiln atmosphere affects ash removal.
The solution viscosity of Mowital SB 70 HH in ethanol does not increase linearly with concentration. At 10 wt%, the viscosity is 60–80 mPa·s; at 15 wt%, rotational viscosity is typically 250–400 mPa·s; at 20 wt%, viscosity may exceed 1200 mPa·s at 20 °C. This imposes a practical upper solids limit of 18–22 wt% for gravure coating at 30–40 m/min web speed. For slot-die coating, 18–20 wt% solids can be processed at 35 °C if the solvent blend contains 10–15 wt% methoxypropanol to slow drying and reduce ribbing. The chosen solvent blend should maintain a Hansen solubility parameter distance below 8 MPa^0.5 from the PVB resin; aromatic and aliphatic hydrocarbon additions above 40 wt% of the solvent mixture cause gelation or precipitation.
Plasticized films based on Mowital SB 70 HH are produced by solvent casting or extrusion. With dibutyl phthalate at 20 phr, the glass transition temperature falls from 68–72 °C to 35–45 °C; elongation at break measured by ISO 527-3 type 5 increases to 150–250%, while tensile strength is 20–30 MPa. The hydroxyl groups contribute to re-adhesion under elevated pressure and heat. In a laminated glass interlayer simulation, two sheets pressed at 140 °C and 0.8 MPa for 30 min form a cohesive bond; published data for the specific peel strength of SB 70 HH in this configuration is limited. Plasticizer selection should avoid aromatic processing oils above 10 phr because phase separation can occur during long-term storage at 40 °C.
In rotogravure, the resin’s molecular weight influences solvent retention. At an engraving depth of 50 μm and press speed of 120 m/min, a 20 wt% solids ethanol/ethyl acetate 80:20 solution reaches residual solvent below 10 mg/m² only when dryer temperatures exceed 60 °C and air flow exceeds 2500 m³/h per meter of web width. Lower airflow produces retained solvent above 30 mg/m², which can cause blocking on rewind. Formulators often replace 10–20% of ethanol with propyl acetate to accelerate solvent release without dissolving the PVB resin.
Thermoplastic processing of Mowital SB 70 HH is used in melt-blended adhesive compounds and in extruded sheet where PVB provides toughness and clarity. Granules are pre-dried at 50–60 °C for 3–4 h to below 0.1 wt% moisture before extrusion on a twin-screw extruder with L/D ratio of 40:1 and barrel temperatures from 180 °C to 220 °C. Melt pressure at the die should remain below 120 bar; above this threshold, shear heating can raise melt temperature above 230 °C and cause yellowing or acetaldehyde release. The high hydroxyl content of the HH grade increases moisture absorption during storage; pellets exposed to 60% relative humidity for 24 h can show surface tack and require re-drying.
| Grade | Viscosity (10 wt% in ethanol, 20 °C) | PVOH content | PVAc content | Processing consequence |
|---|---|---|---|---|
| Mowital B 30 H | 16–20 mPa·s | 18–21 wt% | 1–3 wt% | Higher application solids at equivalent viscosity |
| Mowital SB 70 HH | 60–80 mPa·s | 18–21 wt% | 1–3 wt% | Balanced film strength and solution handling |
| Mowital B 90 H | 120–160 mPa·s | 18–21 wt% | 1–3 wt% | High toughness, lower application solids |
The comparative data in the table show why Mowital SB 70 HH is selected over B 30 H when film toughness and pigment wetting are more important than maximum application solids, and over B 90 H when solution viscosity must remain manageable at 18–22 wt% solids.
Finished formulations containing Mowital SB 70 HH must be assessed in the final article because polymer compliance does not automatically confer compliance on additives, pigments, or residual solvents.
| Standard/regulation | Scope | Typical end-use verification |
|---|---|---|
| EU REACH (EC) No 1907/2006 | Registration of polymer and monomers | Safety data sheet, Section 1 and 15 |
| RoHS Directive 2011/65/EU | Restricted substances in electrical and electronic equipment | XRF screening per IEC 62321-3-1:2013 |
| FDA 21 CFR 175.105 | Adhesive components in food packaging | End-use migration testing per 21 CFR 177 |
| ISO 2409 | Cross-cut adhesion of coatings | Class 0–1 on iron phosphate steel |
| ISO 4624 | Pull-off adhesion of coatings | ≥ 5 MPa at 20–25 μm dry film thickness |
