| HS Code | 721668 |
| Product Name | B08HX Chang Chun PVB Resin |
| Chemical Family | Polyvinyl Butyral (PVB) |
| Appearance | White powder |
| Viscosity 10 Ethanol Solution 25 C | 8–12 mPa·s |
| Hydroxyl Content | 24–26 wt% |
| Butyral Content | 70–74 wt% |
| Acetyl Content | 1–3 wt% |
| Molecular Weight Mw | Approx. 20,000 g/mol |
| Softening Point | 60–70°C |
| Glass Transition Temperature Tg | 65–75°C |
| Density | 1.07–1.11 g/cm³ |
| Refractive Index | 1.48–1.49 |
| Moisture Content | ≤1.0% |
| Acid Value | ≤0.5 mg KOH/g |
As an accredited B08HX Chang Chun PVB Resin factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | B08HX Chang Chun PVB Resin is packaged in 20 kg sealed multi-layer paper bags with inner PE lining, palletized and shrink-wrapped for safe transport. |
| Container Loading (20′ FCL) | 20′ FCL container loading: B08HX Chang Chun PVB Resin securely packed in drums/pallets for safe, efficient transport. |
| Shipping | B08HX Chang Chun PVB Resin ships as a non-hazardous solid, typically in moisture-proof polyethylene-lined bags or drums. Protect from water, humidity, and heat during transit. Keep upright and dry; no special dangerous goods declaration required. Ensure clean, ventilated transport to preserve resin quality and handling ease. |
| Storage | Store B08HX Chang Chun PVB Resin in a cool, dry, well-ventilated area away from heat, sparks, and direct sunlight. Keep the container tightly sealed to prevent moisture absorption, which can affect resin performance. Avoid exposure to high temperatures and incompatible materials. Follow manufacturer’s recommended storage conditions to maintain quality and shelf life. |
| Shelf Life | B08HX Chang Chun PVB Resin has a shelf life of approximately one year when stored in a cool, dry place. |
Corona discharge pre-treatment to a surface energy of 38–42 mN/m on biaxially oriented polypropylene, polyester, and metallised films imposes a narrow polarity window for binder selection in flexographic and rotogravure printing inks. Chang Chun PVB resin B08HX, a low-viscosity polyvinyl butyral grade, is dissolved in an ethyl acetate:ethanol solvent blend at 70:30 by volume; the grade allows final ink solids of 35–42% while maintaining efflux time at or below 25 s in a DIN 4 flow cup at 25 °C. The hydroxyl functionality on the PVB backbone contributes hydrogen bonding to corona-treated film surfaces and pigment particles, while the butyral segments reduce surface tension drift after 48 h ageing. Pigment-to-binder ratios for phthalocyanine blue or carbon black dispersions are typically maintained between 3.0:1 and 4.5:1 by weight; titanium dioxide and lithol rubine require the lower end of the range to avoid viscosity rise during high-shear dispersion. A Cowles dissolver with tip speed of 18–22 m/s is used for 25–35 min, followed by a two-roll mill or bead mill pass with the mill base held below 40 °C to limit PVB thermal degradation. Compliance for indirect food-contact printed films is assessed under FDA 21 CFR 175.300 and EU Regulation 10/2011, with migration testing carried out using vegetable oil simulant D2 for fatty food applications. Print adhesion is validated by ASTM D3359 cross-cut tape pull and should reach 5B on properly primed polymer film. Pre-drying of the PVB powder at 60 °C for 4 h is required if storage relative humidity exceeds 60%. Amine-terminated dispersants should be avoided when isocyanate crosslinkers are later added for lamination-grade ink systems, because premature urea formation increases ink yield stress. End products include snack-food wrappers, pressure-sensitive labels, and aluminium foil confectionery wraps.
PVB-based ink systems of this type are not recommended for high-acid retort lamination where prolonged exposure at 121 °C accelerates ester hydrolysis and interlayer delamination. In such structures, the ink vehicle should be revalidated by Fourier-transform infrared spectroscopy before production approval.
Phosphoric acid at 2.0–3.5 wt% of an 85% solution converts the binder into an adhesion-promoting polyelectrolyte at the steel interface, but it also accelerates acetal hydrolysis if the binder molecular weight is too high. B08HX is formulated into a wash primer at 5.0–7.5 wt% in a solvent blend of isopropanol, methyl ethyl ketone, and toluene at a 1:1:1 volume ratio. Zinc tetroxychromate or zinc phosphate is incorporated at 4.0–6.0 wt% as the inhibiting pigment; the PVB hydroxyl groups wet the grit-blasted substrate and disperse the pigment without generating the thixotropic body associated with higher-molecular-weight PVB grades. Mixing is completed with a high-shear disperser for 15–20 min, and the final primer is passed through a 50 µm filter before use.
The wet film thickness is held between 15 µm and 20 µm when applied by HVLP spray. A flash-off period of 20–30 min at 25 °C is followed by application of the epoxy, polyurethane, or alkyd topcoat. Pull-off adhesion is measured by ASTM D4541; on grit-blasted carbon steel, acceptance values above 5 MPa after 7 days cure are typical, though target values depend on the selected topcoat. Corrosion resistance is evaluated by neutral salt spray testing under ISO 9227, with scribe creep generally required to remain below 2 mm after 500 h. Zinc tetroxychromate-containing primers are subject to REACH authorisation because of the Cr(VI) classification as Carcinogen 1B; many EU coating plants substitute zinc phosphate, but this substitution requires an upward adjustment of phosphoric acid to 3.0–3.5 wt% to maintain adhesion on smooth steel. End products include structural steel bridge girders, ship hull primers, and railway rolling stock pretreatment coats.
In multilayer ceramic capacitor fabrication, binder removal is the primary process bottleneck when green tape thickness exceeds 100 µm. B08HX is combined with a phthalate plasticizer and a phosphate ester dispersant in a toluene:ethanol solvent carrier. A typical slurry contains BaTiO₃ powder 100 parts by weight, B08HX 6.0–8.0 parts by weight, butyl benzyl phthalate 2.0–3.0 parts by weight, and phosphate ester 0.5–1.0 part by weight. The slurry is milled in a planetary centrifugal mixer at 800–1200 rpm for 30 min, then de-aired under 50 mbar vacuum for 10 min. Tape casting is performed with a doctor blade gap of 100–250 µm onto a silicone-coated PET carrier at 0.3–0.8 m/min. Drying in a three-zone oven at 60 °C, 70 °C, and 80 °C removes solvent to produce green tape with 55–65% solids content.
Thermal debinding follows ASTM E1131 thermogravimetric guidance; heating from 200 °C to 600 °C at 0.5–1.0 °C/min under flowing air at 10 L/min is used to avoid cracking from rapid gas evolution. Residual carbon must remain below 0.1% to avoid dielectric loss in fired BaTiO₃. Published data for B08HX in BaTiO₃ tape casting is limited, so lot-to-lot ash content should be verified because sodium and calcium residues above 50 ppm can alter grain growth and reduce breakdown voltage. Lead-free MLCC formulations must satisfy dielectric stability requirements under IEC 60384-22. If butyl benzyl phthalate is restricted under REACH or end-market chemical policies, dioctyl adipate may be substituted, but the burnout profile must then be revalidated because adipate esters volatilise at lower onset temperatures. End products include MLCC dielectric layers, LTCC substrates, and alumina sensor sheets.
Aluminium foil lidding stock for dairy and pharmaceutical unit-dose packaging requires a heat-seal lacquer that activates below 130 °C and does not block on the rewound reel. B08HX dissolved at 12–18 wt% solids in a 50:35:15 MEK:ethyl acetate:ethanol solvent mixture is applied by a 200-line gravure cylinder to a dry film weight of 2.5–4.0 g/m². Dibutyl sebacate is added at 10–20 parts per hundred resin solids to reduce heat-seal initiation temperature; silica matting agent at 0.5–1.0 wt% of total solids prevents blocking during storage at 40 °C. Heat-seal bonding to PVC, PVDC, or Aclar substrates is performed at 120–140 °C, 0.2–0.5 s dwell, and 300–500 kPa jaw pressure. Seal strength is measured according to ASTM F88; typical target values of 6–10 N/15 mm are product-specific and must be validated against package integrity tests under ISO 11607 for medical devices. Compliance includes EU Regulation 10/2011 for plastic food-contact materials and FDA 21 CFR 175.105 for adhesives. Residual solvent from the coating line is controlled below 5 mg/m² total as measured by headspace gas chromatography. Plasticizer migration into the foil coating after 3 months ageing must be monitored because seal initiation temperature can rise above 140 °C in low-humidity storage. End products include yogurt lids, single-portion jam cups, and pharmaceutical blister lidding.
During full cure of phenol-formaldehyde resole resins used in fibre disc and belt backings, crosslink density increases until edge cracking occurs under high-speed grinding. B08HX is compounded with liquid resole at 5–12 wt% of resin solids and dissolved in methyl ethyl ketone before saturating polyester-cotton fabric. The PVB butyral segments reduce fracture energy propagation in the cured backing, while hydroxyl groups retain adhesion to the subsequent make coat. Cited data for B08HX in this specific configuration is limited, so pilot trials are required. Drying and partial cure are typically conducted in a forced-air oven at 110–130 °C for 60 s; full cure is then completed after make coat application. End products include fibre discs and coated abrasive belts for metal finishing.
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The polyvinyl butyral grade B08HX supplied by Chang Chun Petrochemical Co., Ltd. is a polyvinyl butyral resin whose grade designation typically denotes elevated solution viscosity and enhanced adhesion characteristics within the manufacturer’s PVB portfolio. The resin is produced by acid-catalyzed condensation of poly(vinyl alcohol) with n-butyraldehyde in an aqueous medium, leaving a controlled distribution of vinyl alcohol, vinyl acetate, and vinyl butyral repeating units along the polymer backbone. B08HX is positioned for plasticized interlayer film, solvent-borne ceramic binder, heat-seal primer, and wash primer formulations, although the grade-specific certificate of analysis governs exact hydroxyl content, viscosity, and residual volatiles for each production lot. Industrial users commonly characterize the material using ASTM D1396 for compositional analysis and ISO 1133-1:2022 for melt flow behavior under specified temperature and load parameters.
The structural parameters that differentiate polyvinyl butyral grades are the degree of butyralization, the residual vinyl alcohol content, the residual acetate content, and the weight-average molecular weight distribution. In B08HX, a relatively high solution viscosity at a given solids content is generally associated with a high molecular weight fraction; this in turn increases melt strength during sheet extrusion and raises the low-shear viscosity of formulated dispersions. The poly(vinyl alcohol) units provide hydrogen-bonding sites for adhesion to glass, metal oxides, and silane-treated fillers, while the butyral segments impart solubility in alcohol–aromatic solvent blends and compatibility with monomeric plasticizers such as triethylene glycol bis(2-ethylhexanoate). Residual acetate groups, normally present below 3 mol%, reduce hydrogen bonding density and broaden solubility in ketones and esters. Because the manufacturer’s public data for B08HX is limited, the exact hydroxyl and acetate numbers must be obtained from the lot-specific certificate of analysis; however, the handling and formulation responses described here follow from polyvinyl butyral structure–property relationships documented in ASTM D1396 and in published extrusion-grade PVB literature.
Specification control for B08HX is normally built around the analytical methods summarized in the table below. These methods are not grade-specific pass/fail criteria but provide the measurement framework used by converters to compare B08HX against lower-viscosity or lower-hydroxyl PVB grades. Where a producer or formulator needs to verify incoming resin, the relevant parameters are dried resin density, viscosity of a 10 wt% solution in a solvent blend, moisture content, and residual aldehyde. Pre-drying is typically required when storage has occurred at relative humidity above 60%, because absorbed water acts as a blowing agent and hydrolytic degradation accelerator during melt processing.
| Parameter | Standard or method | Process relevance |
|---|---|---|
| Butyral, hydroxyl, and acetate composition | ASTM D1396 | Adhesion and plasticizer uptake prediction |
| Melt mass-flow rate | ISO 1133-1:2022 | Extrusion tooling and screw speed selection |
| Tensile properties of plasticized film | ISO 527-3 | Interlayer energy absorption |
| Optical haze and luminous transmittance | ASTM D1003-21 | Laminated glass clarity |
| Moisture content by Karl Fischer titration | ISO 15512:2019 | Pre-drying and handling control |
| Dilute solution viscosity | ASTM D2857-22 | Solvent-borne binder transfer |
| Density | ASTM D792-20 | Formulation solids calculation |
The solution viscosity of B08HX in industrial coating systems is controlled less by the absolute molecular weight alone than by the solvent composition, hydrogen-bonding interactions, and the resin’s free-volume fraction in the selected solvent blend. In ethanol–toluene mixtures, the resin swells to a hydrodynamic volume determined by the preferential solvation of butyral segments; when aromatic solvent content is raised above a system-specific boundary, the increase in low-shear viscosity can become nonlinear because the collapsed vinyl alcohol sequences re-associate through hydrogen bonding. Formulators using B08HX in ceramic ink binders and wash primers often select a binary or ternary solvent blend to maintain a printable viscosity at 25 °C while meeting drying and flammability limits. High-shear dispersion on a triple-roll mill or bead mill is required before the final viscosity adjustment because the resin exhibits long relaxation times in concentrated solution. Published data for this specific configuration is limited; therefore, the optimum solvent ratio is best determined with a Brookfield viscometer and a cone-and-plate rheometer on production lots rather than inferred from lower-viscosity PVB grades.
During plasticized interlayer film production, a co-rotating twin-screw compounding line is typically followed by a single-screw or twin-screw sheet extrusion stage. The compounding extruder is specified with an L/D ratio of 40:1 or greater to permit resin feeding, plasticizer injection, distributive mixing, and vacuum devolatilization at an absolute pressure below 20 kPa. Melt temperature measured at the die lip is normally monitored with infrared thermography and controlled within a narrow band; because the grade’s elevated molecular weight raises viscous heat generation, screw speed and barrel temperature profiles must be adjusted simultaneously to avoid local thermal degradation. Slot die thickness is commonly set to produce interlayer thicknesses of 0.38 mm, 0.76 mm, or 1.52 mm, with automatic die-bolt control to maintain caliper uniformity across the web. Filtration through a screen changer with bonded mesh packs rated at 20–40 µm is standard practice for removal of gel particles that would otherwise create optical defects in laminated safety glass.
The critical processing window for B08HX is bounded on the low-temperature side by gelation or incomplete plasticizer diffusion and on the high-temperature side by thermal degradation of the acetal linkage. Plasticizer uptake in high-molecular-weight PVB is slower than in low-viscosity grades at equivalent temperature; this creates a minimum residence time requirement in the compounding stage. The melt mass-flow rate determined according to ISO 1133-1:2022 is used as a lot-to-lot rheology fingerprint, but the full shear-rate dependence is more relevant to sheet extrusion. At die shear rates above 1000 s⁻¹, shear-thinning dominates and the apparent viscosity can fall by more than one order of magnitude relative to low-shear values. Because precise grade-specific rheological data for B08HX is not published, converter trials should quantify the storage modulus, loss modulus, and complex viscosity by parallel-plate rheometry over the temperature range of 150–220 °C. The upper limit should not be exceeded for extended residence times because liberated aldehyde and crosslinked gel specks increase optical haze and reduce interlayer tear strength. A vacuum vent with an absolute pressure of 10–15 kPa is required to strip residual moisture and low-molecular-weight by-products before the sheet die.
Compared with lower-viscosity Chang Chun PVB grades used in thin solvent-borne coatings, B08HX imparts higher cohesive strength, greater plasticizer retention, and increased low-shear viscosity at equal solids. These differences become significant in laminated glass applications because a higher-molecular-weight resin supports a higher plasticizer loading without losing tensile elongation; in solvent-based ink systems, the same characteristic raises solvent demand and may require a shift in solvent composition from ethanol-rich to ethanol–toluene or ethanol–MEK blends. Relative to lower-hydroxyl PVB grades, B08HX produces stronger adhesion to glass and mineral substrates but may exhibit greater water sensitivity in unplasticized films. The selection of B08HX over a lower-viscosity grade is therefore driven by the need for film toughness and load-transfer capability rather than by ease of spray application or high-speed flexographic transfer. Where converters require direct substitution, the formulation viscosity must be re-established because a one-to-one replacement at constant solids typically produces a measurable increase in mixing torque and a higher filtered pressure during coating.
In heat-seal coating formulations where a PVB binder is applied to aluminum or polyester film, B08HX changes the heat-seal activation temperature and the cohesive failure mode. The higher molecular weight raises the minimum sealing temperature because chain interdiffusion across the seal interface requires longer thermal energy input or higher nip pressure. In ceramic green tape casting, B08HX serves as a high-strength binder for alumina, zirconia, or barium titanate particles; the relatively high solution viscosity at a given solids content allows the wet tape to maintain thickness during solvent evaporation but may reduce the maximum solids loading. Burnout behaviour is governed by the formulation rather than by the resin alone, although a high-molecular-weight PVB can leave a carbon-rich residue unless the binder removal profile includes an oxidative step between 250 °C and 450 °C under air flow. The use of B08HX as a direct replacement for lower-hydroxyl PVB in such systems should be preceded by thermal gravimetric analysis because published data for this specific configuration is limited.
Storage of B08HX should be in tightly closed containers below 30 °C and protected from direct sunlight and moisture. The resin absorbs water from ambient air; at relative humidity above 60%, pre-drying in a dehumidifying hopper dryer or vacuum oven is required to reduce moisture content before melt processing. Compliance documentation for the grade generally references the manufacturer’s REACH registration under Regulation (EC) No 1907/2006, and end-use verification against RoHS Directive 2011/65/EU is available through lot-specific analytical reports. For food-contact applications, converters must independently determine whether the intended use falls within the relevant national or regional approval because PVB resins are not universally cleared for direct food contact; compliance statements must be tied to finished-article migration testing under the applicable food-contact regulation.
The residual hydroxyl content of B08HX contributes to interfacial hydrogen bonding with silanol groups on float glass, but adhesion is also influenced by the plasticizer type, moisture content, and autoclave cycle. In laminated safety glass production, the glass/interlayer stack is processed through a de-airing nip roll line then heated under pressure in an autoclave. If the resin’s hydroxyl content or the plasticizer’s hygroscopic character displaces water at the interface, the laminate may exhibit excessive or insufficient pummel adhesion. Excessively high hydroxyl functionality can produce brittle interfacial failure, whereas insufficient adhesion allows delamination under impact. Interlayer tensile properties are commonly evaluated according to ISO 527-3, and optical quality is assessed by ASTM D1003-21; the fracture energy of the laminate is evaluated under impact conditions described in ISO 12543-2:2021. Because B08HX is an elevated-viscosity grade, processors should verify that the autoclave soak time and temperature are sufficient to allow complete plasticizer redistribution; incomplete redistribution produces edge voids and visible optical distortion at the glass periphery.
For solvent-borne ink and ceramic slurry production, B08HX is best dispersed under controlled high-shear conditions rather than simple propeller agitation. A high-speed disperser with a tip speed of 15–25 m/s can wet the resin into the solvent blend, but full dissolution of high-molecular-weight PVB requires hold time and temperature above 30 °C. Bead mills charged with 0.8–1.2 mm zirconia beads are used to disintegrate gel nuclei and develop pigment dispersion stability; the mill jacket is maintained below 45 °C to prevent solvent evaporation and resin precipitation. Filtration through a 10 µm absolute bag or cartridge filter is typical before letdown. Because B08HX raises the mill base viscosity more than lower-viscosity grades, the pre-mix solids level must be reduced by 5–10% relative to a conventional PVB grade to avoid hydraulic overloading and temperature overshoot in the bead mill.
B08HX is compatible with many polyester plasticizers, epoxy resins, and phenolic adhesion promoters, but formulators should avoid combining the resin with strongly basic amine catalysts or blocked amine crosslinkers in storage-stable one-package systems. Basic species accelerate acetal hydrolysis and can release free aldehyde, especially in moist solvent blends. Isocyanate-functional co-reactants may also react with the residual hydroxyl groups, increasing viscosity prematurely and shifting the final crosslinked network toward brittleness. The safe use of such systems requires a two-component supply and a defined pot life established by viscosity rise measured at 25 °C. These incompatibilities are not unique to B08HX but are more pronounced than in low-hydroxyl PVB grades due to the higher concentration of available hydroxyl sites.
