| HS Code | 937494 |
| Product | B08SY Chang Chun PVB Resin |
| Appearance | White fine powder |
| Viscosity 10 Ethanol Solution At 25 C | 8 mPa·s |
| Degree Of Butyralization | 70.0 ± 2.0% |
| Hydroxyl Group Content | 27.0 ± 2.0% |
| Acetyl Group Content | ≤ 3.0% |
| Glass Transition Temperature | ~70°C |
| Specific Gravity | 1.10 |
| Solubility | Soluble in ethanol, methanol, isopropanol, and ethylene glycol monoethyl ether; insoluble in aliphatic hydrocarbons |
| Refractive Index | 1.49 |
| Water Absorption | ≤ 1.2% |
| Tensile Strength | ~30 MPa |
| Elongation At Break | ~100% |
| Thermal Decomposition Temperature | >250°C |
As an accredited B08SY Chang Chun PVB Resin factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | B08SY Chang Chun PVB Resin is supplied in 20 kg multi-layer paper bags on shrink-wrapped pallets, ensuring safe transport and storage. |
| Container Loading (20′ FCL) | 20′ FCL: B08SY Chang Chun PVB Resin securely loaded, stowed, and containerized for safe transport. |
| Shipping | B08SY Chang Chun PVB Resin is a white, free-flowing powder shipped in sealed, moisture-proof packaging. Keep dry, cool, and away from ignition sources. Not classified as dangerous goods for transport, but avoid excessive heat, humidity, and prolonged storage. |
| Storage | Store B08SY Chang Chun PVB Resin in a cool, dry, well-ventilated area away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption and contamination. Avoid exposure to high humidity or temperature extremes. Follow manufacturer’s guidelines; under proper conditions, shelf life is typically maintained for several months. |
| Shelf Life | Shelf life for B08SY Chang Chun PVB Resin is typically 12 months from manufacture date when stored in original, unopened packaging under cool, dry conditions. |
In laminated safety glass interlayer production, Chang Chun B08SY polyvinyl butyral resin is conditioned at 25 ± 2 °C and 40–50 % relative humidity before compounding. The powder is dry-blended with triethylene glycol di-(2-ethylhexanoate) plasticizer at 30–38 phr, a hindered phenolic antioxidant at 0.1–0.3 phr, and a potassium formate or magnesium acetate adhesion control salt at 0.05–0.2 phr. The premix is fed into a co-rotating twin-screw extruder with an L/D ratio of 38:1–42:1, barrel temperature profile from 150 °C to 200 °C, and screw speed of 250–350 min⁻¹ on a 75–150 mm machine. Because polyvinyl butyral undergoes decomposition at elevated temperature, the melt temperature is held below 210 °C and residence time is limited to 3 min maximum; exceeding this window produces yellowing and lowers pummel adhesion to glass. The extruded sheet is calendered to 0.38 mm, 0.76 mm, or 1.52 mm nominal thickness and stored in a controlled room at 18–22 °C and 25–35 % RH to prevent blocking of the cut edges.
Residual moisture in B08SY is the primary defect source in interlayer lamination; a Karl Fischer titration value above 0.35 % at the extruder feed throat produces steam bubble formation at the glass/PVB interface during autoclave cycles. If the resin has been exposed to ambient humidity above 60 %, pre-drying is required in a vacuum oven at 60–65 °C for 4–6 h before compounding. Compliance for the finished laminated glass is verified against ANSI Z26.1, ASTM C1172-19, and ISO 12543 for architectural and automotive glazing; optical haze and luminous transmittance are measured according to ASTM D1003, tensile elongation of the plasticized film according to ISO 527-3, and glass adhesion by the pummel test described in ASTM F1233 or an equivalent instrumented impact method. B08SY should not be combined with high concentrations of amine-functional silanes or amine-containing anti-block additives at extrusion temperatures, because the hydroxyl and residual acetate groups can interact with amines and shift the adhesion/delamination balance in ways that are not controllable at line speed.
B08SY functions as the film-forming binder in two-component wash primers applied to cold-rolled steel before epoxy, alkyd, or polyurethane topcoats. The mill-base is prepared by dissolving B08SY at 7–9 % by weight in a solvent blend of isopropyl alcohol and xylene at 60:40 to 80:20; the solution is then let down with 3–5 % of 85 % phosphoric acid and 2–4 % of a chromate-free zinc phosphate or zinc tetroxychromate replacement pigment. The phosphoric acid etches the steel surface and forms an iron phosphate conversion layer, while B08SY encapsulates the pigment and provides the adhesion base for subsequent topcoats. The mixed primer is applied by HVLP or air-atomized spray gun with nozzle diameter 1.2–1.4 mm and atomization pressure 2.5–3.0 bar, producing a dry film thickness of 8–12 µm on the cleaned substrate.
Adhesion of the wash primer and selected topcoat system is evaluated by cross-cut tape pull according to ISO 2409:2020 or ASTM D3359-17 Method B; salt spray resistance is assessed according to ISO 9227 or ASTM B117-19 after overcoating. If B08SY addition exceeds 10 wt% of the primer base, the cured film becomes sufficiently hydrophobic that amine-cured epoxy topcoats can fall below the class 0/class 1 requirement in ISO 2409; if phosphoric acid is below 3 %, the conversion reaction is incomplete on retained mill-scale surfaces and scratch-creep resistance after 240 h salt spray is typically reduced. Pot life after mixing is 8–24 h at 20 °C, but the shorter end of that range applies when ambient humidity exceeds 70 % because hydrated zinc phosphate agglomerates settle and reduce spray transfer efficiency. Alcohol-based B08SY wash primers are not suited to direct application on aluminum alloys without an etching additive, and they are not recommended for immersed seawater service without a subsequent high-build barrier topcoat.
| Parameter | Test method | Control band |
|---|---|---|
| B08SY in mill-base | ASTM D2196-20 solution viscosity | 7–9 wt% |
| Phosphoric acid addition | titration against 0.1 N NaOH | 3–5 wt% of 85 % acid |
| Dry film thickness on steel | ISO 2178:2016 | 8–12 µm |
| Cross-cut after overcoat | ISO 2409:2020 | class 0–1 |
| Neutral salt spray | ISO 9227 / ASTM B117-19 | 240 h, no delamination at scribe beyond 2 mm |
Ceramic tape casting slurries based on alumina or barium titanate utilize B08SY as the primary polymeric binder for green-film handling strength after drying. A binder solution is prepared by dissolving B08SY at 15–20 wt% in a 60:40 methyl ethyl ketone/ethanol binary solvent. This solution is added to a ceramic powder milled with a phosphate ester dispersant, so that the final slurry contains 65–75 wt% ceramic powder, 3–5 wt% B08SY, 0.5–1.0 wt% dispersant, 1–2 wt% butyl benzyl phthalate plasticizer, and the balance solvent. Slurry viscosity is adjusted to 1500–3500 mPa·s at 20 °C using a Brookfield viscometer at 20 min⁻¹; the doctor blade gap is set between 100 µm and 300 µm depending on the final dielectric layer thickness required by the multilayer component design.
The cast tape is dried in a two-zone forced-air oven with the first zone at 30–40 °C and the second zone at 50–60 °C to prevent surface skinning. Residual solvent retention above 1.5 % by thermogravimetric analysis causes lamination defects during stack-up, while solvent-free green tape is cut after it has equilibrated to 3 % moisture by weight or lower. Binder burnout is performed under air from 250 °C to 450 °C at a heating rate not exceeding 1 °C/min; B08SY leaves an ash residue that must be confirmed against the alkali metal and silicon specification of the ceramic formulation. Published data for B08SY in multilayer ceramic capacitor dielectric tapes is limited, so the burnout profile and residual carbon content should be validated by differential thermal analysis on the final tape because incomplete PVB decomposition leaves carbon-rich domains that contribute to dielectric loss and porosity in the sintered layer.
Flexographic and gravure surface-printing inks for corona-treated polypropylene, polyester, and coated paper can incorporate B08SY as a co-binder to raise heat resistance and reduce blocking in rewind. In a solvent-based flexo varnish, B08SY is dissolved at 8–12 % in an ethyl acetate/ethanol 70:30 blend and added to an acrylic or nitrocellulose base at 2–6 % of total varnish solids. If B08SY replaces more than 15 % of the acrylic binder by weight, static and dynamic surface tension can increase and dot gain on high-speed press units becomes measurable with a reflection densitometer; at 3 % replacement, the effect is typically below 0.05 optical density drift on polyethylene film printed at 150 m/min. Millbase dispersion is performed on a bead mill with zirconia beads of 0.8–1.2 mm diameter at chamber tip speed of 10–12 m/s; the finished ink is adjusted to 18–22 s Zahn cup #2 or 25–30 s DIN 4 mm at 23 °C.
Viscosity is monitored per ASTM D4212-16; adhesion is assessed by tape pull per ASTM D3359 following 24 h aging at 23 °C and 50 % RH. B08SY-containing ink is not recommended for high-velocity warm-air dryers on central impression presses when the applied wet film exceeds 5 µm; trapped solvent in the PVB phase can create blocking in rewind. Lamination inks formulated with B08SY can show reduced bond strength after 48 h because unreacted hydroxyl groups compete with isocyanate curing agents; when a solventless polyurethane adhesive is laminated over the printed ink, a higher isocyanate index or a polyurethane tie-coat is required to maintain acceptable film-peel cohesion under ISO 527-3.
B08SY is compounded into heat-seal lacquers and plasticized hot-melt systems where an alcohol-soluble, high-tack binder is required. A starting formulation for a heat-seal coating contains 20–25 % B08SY, 10–15 % rosin ester tackifier, 3–5 % acetyl tributyl citrate plasticizer, and 55–67 % ethyl acetate/ethanol solvent. The solution is coated on aluminum foil or polyester film at 5–10 g/m² dry coat weight using a reverse gravure or slot-die coater; drying occurs at 80–100 °C with oven residence time of 10–20 s. The heat-seal activation temperature is typically 95–120 °C at 2–4 bar for 1–2 s on a constant-heat jaw sealer. Seal strength is measured by ASTM F88/F88M-21 or ISO 527-3 after conditioning at 23 °C and 50 % RH; melt flow of the dried film is screened by ISO 1133-1:2022 and thermomechanical stability by ASTM D4440-15 or dynamic shear rheometry from 25 °C to 150 °C.
B08SY has lower melt strength than EVA or polyester hot-melt bases; where seal stress is above 3 N/15 mm, the adhesive should be crosslinked with an aliphatic isocyanate or blended with a higher molecular weight PVB grade. Amine-based tackifiers should be avoided because they can catalyze hydrolysis and generate butyraldehyde odor during storage. Direct food-contact sealing applications require migration testing under FDA 21 CFR 175.300 and EU 10/2011; the grade is not accepted for direct food-contact sealing unless those conditions are explicitly verified on the finished structure.
| Parameter | Wash primer | Ceramic tape binder |
|---|---|---|
| B08SY solid addition | 7–9 wt% | 3–5 wt% |
| Solvent system | IPA/xylene 60:40–80:20 | MEK/ethanol 60:40 |
| Critical upper limit | 10 wt% B08SY; above this intercoat adhesion degrades | 5 wt% B08SY; above this slurry viscosity rises beyond 3500 mPa·s |
| Main drying/processing temperature | 20 °C ambient cure | 30–60 °C two-zone dried tape |
B08SY is used as a toughening modifier for heat-cured phenolic adhesives and fiber-reinforced composite matrices where the unmodified resole is too brittle for peeling or impact-loaded joints. A modified resole is prepared by dissolving B08SY at 5–15 parts per hundred resin in a methyl ethyl ketone or methanol solution of phenol-formaldehyde oligomer. The blend is coated onto glass or aramid fabric and B-staged at 90–100 °C for 8–12 min; final cure is carried out at 150–170 °C under 0.5–1.5 MPa consolidation pressure. B08SY lowers the cured matrix modulus and increases Mode I interlaminar fracture toughness, but because PVB decomposes near phenolic cure temperatures, volatile emission of butyraldehyde becomes quantitatively significant above 180 °C and must be captured in the process exhaust. Tensile and flexural properties are evaluated by ASTM D638-14 and ASTM D790-17; volatile organic emissions are screened by ISO 16000-6 or equivalent thermal desorption-GC/MS.
Addition of B08SY above 15 phr can reduce the glass transition temperature of the cured phenolic network by 10–20 °C and may compromise hot-wet performance under 85 °C and 85 % RH conditioning. If the composite must meet EN 45545-2 fire safety for railway interiors, a halogen-free flame retardant package and cone calorimetry per ISO 5660-1 are required because PVB contributes aliphatic carbon content and increases the effective heat of combustion. The degree of phenolic-PVB interpenetration is determined by dynamic mechanical analysis over the range 25–250 °C; phase separation is acceptable only if the storage modulus retention at 120 °C remains above the component-specific design limit established in the part drawing.
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B08SY Chang Chun PVB Resin is a polyvinyl butyral grade supplied by Chang Chun Petrochemical Co., Ltd. and manufactured by acid-catalysed acetalization of polyvinyl alcohol with n-butyraldehyde. The product is supplied as white, free-flowing granules or powder and is controlled for residual vinyl alcohol content, residual acetate, moisture, ash, dilute solution viscosity, and optical solution clarity. Unlike re-pelletised PVB film scrap or off-spec interlayer regrind, B08SY is a reactor-grade resin; the absence of unknown plasticizer residues and partial thermal history allows reproducible plasticizer absorption and a narrower gel particle distribution. Incoming inspection is commonly aligned with ISO 1133-1:2022 for melt flow rate when the material is processed through melt extrusion, with ASTM D1795-13 or ISO 1628-3 for dilute solution viscosity, with ISO 3451-1 for ash, and with ISO 15512:2019 for moisture. The supplier’s certificate of analysis is the binding lot-specific specification.
The B-series designation differentiates resin grades by viscosity and hydroxyl level. B08SY is typically sold against application requirements for laminated safety glass interlayer and high-strength ceramic green tape rather than as a low-cost general-purpose ink resin; users compounding flexographic inks may still select it when adhesion to aluminium foil is critical. Direct substitution of B08SY into an existing ink formula based on a lower-hydroxyl PVB grade usually requires solvent rebalancing and viscosity adjustment, because the polar contribution of the resin shifts the Hansen solubility parameter interaction radius of the vehicle. This is not captured by a single “solubility” value; the vehicle is evaluated visually, by turbidity, and by Brookfield viscosity after complete dissolution.
Lower-hydroxyl PVB resins dissolve in less polar solvent blends such as 80:20 toluene/ethanol, but their polar adhesion to glass, aluminium, and ceramic substrates is reduced. B08SY, when its vinyl alcohol value is confirmed by the CoA, moves the solubility window toward higher alcohol blends—commonly 95:5 ethanol/methanol or 80:20 isopropanol/methyl ethyl ketone. In flexographic ink vehicles for treated polyethylene and polyester films, the chosen solvent ratio controls dry-rate, anilox transfer, and ink resolubility. In polyvinyl butyral-phosphoric acid wash primers, residual hydroxyl groups provide adhesion-promoting functionality, but excess freely associated hydroxyl can accelerate viscosity rise through hydrogen bonding and acid-catalysed acetal exchange. The operational difference is therefore not limited to final film properties: lower-hydroxyl grades usually give lower solution viscosity and longer pot life, while B08SY gives higher polar wetting and improved adhesion to chromated aluminium and annealed glass, but requires tighter stoichiometric control of phosphoric acid addition. Adhesion performance can be evaluated with cross-cut tests per ISO 2409 and pencil hardness per ISO 15184 after 7-day ambient cure.
Dissolution of B08SY in solvent blends proceeds through solvent penetration into amorphous regions followed by chain disentanglement; it is not a simple low-shear mix. In an industrial anchor-stirred vessel running at 100–150 min⁻¹ with a 10 wt% resin charge in 95:5 ethanol/methanol at 20–25°C, a specular solution is typically reached within 2–4 h. High-shear dispersers reduce this cycle to 45–90 min but can raise the local temperature at the shear gap above 40°C and increase solvent loss through evaporation. For flexographic and gravure ink manufacture, filtration through a 25 μm absolute bag or cartridge after dissolution is used to remove microgel residue; residual gel particles larger than 25 μm cause print mottle, anilox plugging, and doctor-blade streaking on high-speed presses. The final ink vehicle is preferably adjusted by solids content rather than by adding high-boiling esters, because ester addition changes drying rate and can destabilise pigment dispersions. Brookfield-type viscosity at 10 wt% solids in 95:5 ethanol/methanol at 20°C for this resin class is often reported in the 100–200 mPa·s range; the CoA value should be used for incoming release.
Because ethanol/methanol and methyl ethyl ketone blends are flammable, the dissolving vessel must be inerted or ventilated. In production-scale dissolvers, a variable-speed disperser with tip speed of 5–10 m/s is used for the first 15 min to wet out the powder; the speed is then reduced to 2–4 m/s to avoid vortex aeration. Uncontrolled aeration raises dissolved oxygen and can produce foam in later ink letdown, which is removed only by vacuum de-aeration at 20–30 kPa absolute pressure.
B08SY is hygroscopic. Open storage at 60% RH can raise powder moisture to approximately 0.5 wt%; feed moisture above 0.10 wt% during extrusion accelerates hydrolysis, produces bubble defects, and increases die-lip deposit formation in PVB interlayer sheet. Pre-drying in a desiccant hopper dryer at 60–70°C with a dew point below -40°C for 2–4 h is required before compounding. Production lines typically use a co-rotating twin-screw extruder with an L/D ratio of 30–44 and vacuum devolatilisation in the second barrel zone. When B08SY is compounded with triethylene glycol bis(2-ethylhexanoate) at 30–40 phr, the melt temperature is maintained between 190°C and 210°C; excursions above 220°C accelerate acid-catalysed acetal hydrolysis and create gel specks in calendered sheet. The resin should not be combined with amine-based additives in this melt route because amines scavenge acetic acid and interfere with glass adhesion control. Published TGA data for the PVB resin class show 5% mass loss near 230–260°C in nitrogen; process temperatures should remain below 220°C to avoid the onset of autoaccelerated degradation.
Replacement of a general-purpose PVB resin with B08SY in laminated glass interlayer compounding is not a drop-in substitution. Plasticizer uptake rate and distribution are governed by particle surface area, resin molecular weight, hydroxyl content, and residual acetate. In heated ribbon blenders at 60–70°C, B08SY-type resins with narrow molecular weight distribution reach visual dry-plasticizer absorption sooner than broader-distribution off-spec material; however, published data for this specific configuration is limited, and each formulation should be validated by torque rheometry in a Brabender-type mixer at 150°C. For glass adhesion control, magnesium acetate or potassium acetate is added to keep pummel adhesion within the range required by the glazing specification; pummel values are test-dependent and are not transferable between glass types, wash protocols, and autoclave cycles. Final interlayer sheet must pass optical counts for gel and undispersed resin. The critical operating boundary is moisture: plasticized compound exposed to air at RH >60% must be re-dried or used immediately before extrusion, because absorbed moisture above 0.10 wt% creates microvoids during vacuum calendering. Tensile properties of the plasticized sheet can be tested according to ASTM D638-14 after conditioning at 23°C and 50% RH.
Compared with EVA and ionoplast interlayers, a B08SY-based PVB sheet has higher moisture sensitivity but does not require silane primer for glass bonding; ionoplast grades provide higher stiffness and lower creep but require different edge treatment and autoclave handling. EVA encapsulants flow at lower autoclave pressures and are less sensitive to moisture but do not match the glass adhesion and optical clarity of PVB in thick laminated-glass assemblies. B08SY is specified where the mechanical and optical performance of PVB interlayers is governed by standards such as ISO 12543-2.
In ceramic green tape production, B08SY is used as the binder phase for alumina and glass-ceramic systems. The resin is dissolved in a two-component solvent mixture—commonly methyl ethyl ketone/ethanol—with plasticizer such as dibutyl phthalate or benzyl butyl phthalate. Tape casting at 20–25°C with blade gaps of 200–400 μm requires slurry viscosity in the range of 1.0–3.0 Pa·s at 1 s⁻¹; B08SY’s low gel count improves filtration through 10 μm stainless-steel wire cloth. During burnout, the resin decomposes in air between 350°C and 450°C; residual carbon above 0.05 wt% is avoided for low-temperature co-fired ceramic substrates because it increases dielectric loss and microcracking. In comparison with acrylic binders, PVB provides higher green strength at lower binder addition and is less prone to air bubbles under vacuum de-airing. The dried green tape must be stored below 30% RH to prevent moisture-induced curl and binder migration. In alumina tape casting, binder concentration is usually 6–12 wt% of total slurry solids; B08SY at the higher end increases green density but shifts the burnout profile. The burnout ramp should include a hold at 250°C for 1 h before final ramp to 450°C; failure to hold produces skin-over and trapped carbon in thick films above 100 μm.
Because B08SY differs from lower-hydroxyl grades most strongly in solution polarity and plasticizer interaction, the incoming QC program should rank the hydroxyl value and dilute solution viscosity above a single melt-flow index. The following matrix summarises the test platform commonly applied to B08SY at incoming inspection.
| Parameter | Test standard | Purpose in B08SY control |
|---|---|---|
| Dilute solution viscosity | ASTM D1795-13 / ISO 1628-3 | Molecular weight consistency; ink and plasticizer response |
| Moisture content | ISO 15512:2019 | Pre-drying threshold for extrusion and casting |
| Ash content | ISO 3451-1 | Residual catalyst and salt contamination |
| Melt flow rate | ISO 1133-1:2022 | Melt-phase processing check |
| Hydroxyl value | ISO 4629-2:2016 | Grade confirmation and solubility control |
| Residual acetate identification | Vendor FTIR method against retained reference | Detection of thermal history or off-grade material |
Where the B08SY CoA hydroxyl value is not available, the resin should be conditioned at 23°C and 50% RH before viscosity testing because moisture alters dilute solution viscosity and can shift apparent molecular weight. Replicate lots should be tested after 24 h dissolution in sealed glass containers to avoid solvent composition drift.
