| HS Code | 428970 |
| Chemical Name | Polyvinyl alcohol |
| Cas Number | 9002-89-5 |
| Appearance | White to slightly yellow granular powder |
| Degree Of Hydrolysis | 86.5-89.0 mol% |
| Viscosity 4 Solution 20 C | 28.0-32.0 mPa·s |
| Average Degree Of Polymerization | Approx. 1700 |
| Ph 4 Solution | 5.0-7.0 |
| Ash Content | ≤0.5 wt% |
| Volatile Content | ≤5.0 wt% |
| Bulk Density | 0.4-0.6 g/cm³ |
| Specific Gravity | 1.27-1.31 |
| Solubility | Soluble in hot water; practically insoluble in cold water and organic solvents |
| Thermal Decomposition Temperature | Approx. 200°C |
As an accredited CCP PVA BP-17S factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | CCP PVA BP-17S is supplied in 25 kg multi-wall kraft paper bags with polyethylene liners, ensuring safe handling and storage. |
| Container Loading (20′ FCL) | 20′ FCL shipping for CCP PVA BP-17S: 20-foot full container, palletized bags, dry, ventilated, secured, safe transport. |
| Shipping | CCP PVA BP-17S is a polyvinyl alcohol resin, shipped as a non-hazardous solid. It should be packed in sealed multi-layer bags or drums to prevent moisture absorption. Keep dry, avoid direct sunlight, and store below 30°C. No dangerous goods declaration required under standard transport regulations. |
| Storage | Store CCP PVA BP-17S in a cool, dry, well-ventilated area away from direct sunlight and heat sources. Keep the container tightly sealed to prevent moisture absorption and contamination. Avoid exposure to humidity, dust, and incompatible materials such as strong oxidizers. Maintain stable temperatures, and follow all local safety regulations for polymer storage. |
| Shelf Life | Shelf life is typically 12 months from manufacture when stored unopened in a cool, dry place. |
In semi-continuous vinyl acetate-ethylene (VAE) copolymerisation processes carried out in 10 m³ stainless-steel jacketed reactors equipped with dual four-blade pitched-blade turbines, the protective colloid performance of partially hydrolysed PVOH grades with a degree of hydrolysis between 87 mol% and 89 mol%—such as BP-17S—determines both the colloidal window during nucleation and the shear resilience of the finished latex during drum-off and high-speed coating transfer. A shift of only 0.5 percentage points in the colloid addition rate, from 4.0 wt% to 4.5 wt% on total monomers, has been documented on commercial lines to elevate Brookfield RVT viscosity (spindle #5, 20 rpm, 25 °C) from below 5 000 mPa·s to beyond 12 000 mPa·s, accompanied by a pronounced yield stress that impairs filterability through 200 µm bag filters immediately upstream of the pressure homogeniser. Plant records confirm that when the PVOH feed solution temperature drops below 65 °C due to inadequate jacketed line tracing, the metering pump—typically a progressive cavity type—experiences pressure pulsations exceeding 3 bar, forcing a temporary reduction in vinyl acetate monomer injection to avoid runaway particle size growth and microgel formation. Compliance with Regulation (EC) No 1907/2006 (REACH) is mandatory; the PVOH substance holds a joint registration dossier that confirms no classification for acute aquatic toxicity under UN GHS and supports use in adhesives without carrying risk phrases H400 or H410. The BP-17S grade, characterised by a 4 % aqueous solution viscosity of 23–33 mPa·s at 20 °C per ISO 15023-2:2019, delivers a cloud point in the range 34–38 °C when dissolved in a 15 % sodium sulphate brine, indicating limited hydrophobe association that is essential for stabilising vinyl acetate droplets without excessive grafting. A typical adhesive formulation for wood-to-wood lamination combines 100 parts (dry) of a VAE dispersion polymerised with 4.2 wt% BP-17S and 0.03 wt% sodium persulphate initiator, adjusted to 55 % solids, with 5 parts of a boric acid post-additive to enhance wet tack; the finished adhesive must pass the EN 204 D3 durability classification. Equipment limitations become evident when the latex viscosity at 50 °C exceeds 8 000 mPa·s: the falling-film evaporator used for residual monomer stripping cannot maintain a uniform film on the tube side, leading to hot spots and yellowish coagulum that must be filtered through 100 µm vibrating screens before drumming.
| Table 1 — Impact of BP-17S Addition Level on VAE Latex Properties (Semi-continuous process, 90 °C jacket) | |||
| BP-17S (wt% on monomers) | Brookfield RVT viscosity at 25 °C (mPa·s) | Median particle size (µm, laser diffraction) | Coagulum after 100-mesh screen (g/kg) |
| 3.0 | 2 800–3 500 | 0.85–1.10 | < 0.5 |
| 3.8 | 5 500–7 200 | 0.70–0.95 | 0.5–1.2 |
| 4.5 | 11 000–14 500 | 0.50–0.75 | 2.5–5.0 |
Surface sizing of uncoated woodfree printing paper with a starch-PVOH blend at a film transfer speed exceeding 1 500 m·min⁻¹ introduces a hydraulic pressure pulse in the metering nip that destabilises the film split when the dynamic surface tension of the size liquor climbs above 45 mN·m⁻¹. BP-17S, dissolved at 6–8 % solids together with a thermally modified corn starch (viscosity 15–25 mPa·s at 60 °C measured by Brookfield #2 spindle at 100 rpm), is applied through a Speedsizer or Film Press unit with a rod-metering assembly where the rod pressure is set at 1.8–2.5 bar and the backing roll hardness is kept at 75–80 P&J. Plant trials confirm that when the BP-17S fraction exceeds 35 % of the dry size pickup, which itself is targeted at 1.2–1.8 g·m⁻² per side, the tack force at the doctor blade edge builds up over a run length of 15 kilometres until it tears the base sheet at the draw between the size press and the first after-dryer cylinder, an effect exacerbated by a moisture profile deviation greater than 0.5 % absolute across the web. Regulatory compliance for food contact uses relies on FDA 21 CFR 176.170 (components of paper in contact with aqueous and fatty foods) and EU No 10/2011 Annex I; migration testing under EN 1186-3 with 3 % acetic acid simulant at 40 °C for 10 days consistently yields specific migration of PVOH below 0.05 mg·kg⁻¹ when the size formulation contains 100 ppm of a glyoxal insolubiliser. The finished paper grade—typically 80 g·m⁻²—delivers a Cobb60 value below 22 g·m⁻² and a surface strength measured by IGT pick resistance below 1.8 m·s⁻¹ with the PU 380 ink, satisfying the offset printing requirements of high-speed sheet-fed presses.
In slasher sizing operations for 65/35 polyester–cotton ring-spun yarns of nominal 19.7 tex, the sizing bath maintained at 70 ± 2 °C contains 9–11 % solids composed of BP-17S and an acid-thinned potato starch in a 1:1.5 dry weight ratio, plus 0.8 wt% (on size solids) of a phosphate ester wax as lubricant. The partially hydrolysed PVOH with a 1 700 degree of polymerisation exhibits a film tensile strength exceeding 42 MPa at 23 °C and 50 % RH and an elongation at break of 180–220 %, which adequately covers the abrasion-prone surface fibres without the excessive stiffness that causes shedding at lease rods during high-speed weaving on air-jet looms running at 850 picks·min⁻¹. During a production campaign lasting 72 hours, the viscosity of the size liquor must be held within ±5 % of the target 55 mPa·s (Brookfield #3, 60 rpm, 70 °C), otherwise the size add-on measured by squeeze roll nip pressure of 90 N·cm⁻¹ deviates beyond ±0.8 % absolute, leading to loom stops caused by excessive warp breakage rates that surpass 0.5 breaks per 10⁵ picks. Compliance is bound to ZDHC MRSL v3.1; BP-17S contains no alkylphenol ethoxylates (APEOs) and exhibits a heavy metal content below 10 mg·kg⁻¹ for lead and 1 mg·kg⁻¹ for cadmium when tested by EN 16711-1:2015 acid digestion. The desized fabric, after enzymatic starch removal with an amylase bath at 60 °C and a subsequent peroxide bleach, retains a residual PVOH film below 0.1 % on weight of fabric, which is fully acceptable for the dyeing of pale shades without creating a resist effect.
Spray-dried dispersible polymer powders destined for cementitious tile adhesives require a protective colloid that survives a 200 °C inlet temperature without inducing powder caking during cyclone separation, and BP-17S has been adopted in niche formulations where the powder must rewet within 30 seconds under mild shear to form a lump-free dispersion. In a typical manufacturing operation, a carboxylated vinyl acetate-ethylene-vinyl chloride terpolymer emulsion with a solids content of 52 % is post-stabilised by adding 10–14 wt% (on emulsion solids) of a BP-17S solution at 15 % concentration through an in-line static mixer before entering the pressure nozzle atomiser of a 1.2 m diameter co-current spray tower. The outlet temperature control band is critical: when the setpoint of 85 °C is exceeded by more than 3 °C, the surface of the powder particles undergoes premature film formation that raises the ash content determined by ISO 3451-1:2019 by 0.7–1.2 % above the expected 11.5 %, and the redispersibility measured by EN 12004 sag resistance deteriorates below 0.5 mm. The finished powder, combined with 350 kg of EN 197-1 CEM I 42.5 R cement per tonne of dry-mix, must demonstrate a tensile adhesion strength after water immersion of at least 0.5 MPa according to EN 1348. Production records indicate that batch-to-batch variability in the BP-17S residual acetate content—specified at 11–13 mol%—shifts the cloud point of the protective colloid and thereby alters the minimum film-forming temperature (MFFT) of the redispersible powder by up to 3 °C, occasionally triggering block-out in silos with inadequate cooling jackets below 30 °C.
Remoistenable adhesives for envelopes and postage stamps are formulated with BP-17S at 10–15 % solids, blended with 2–4 wt% (on PVOH) of glycerol and 0.5–1.0 wt% of a urea plasticiser to depress the dry film brittleness point below −5 °C. The adhesive is applied to 85 g·m⁻² kraft stock through a slot-die coater at a line speed of 180 m·min⁻¹, and the gap between the die and the backing roller is kept at 125 µm to deposit a dry coat weight of 6–8 g·m⁻². A practical processing hazard arises when the solution is held in a trough without a water-jacketed lid: evaporative cooling at the surface increases the local viscosity by more than 1 500 mPa·s, causing the contact line at the slot lip to oscillate and produce transverse streaks visible as uneven gloss after drying. The dry adhesive film must meet the USPS specification for peel-back re-moistenability, meaning that a 10 µL droplet of distilled water placed on the adhesive side achieves a wet tack level sufficient to lift a 500 g weight within 8 seconds; BP-17S delivers this consistently when the residual moisture in the coated paper is kept below 5.5 %. For postage stamp applications covered by APACS guidelines, a fungicide kit based on 0.015 % BIT/MIT biocide is mixed in to prevent mould growth during storage in humid tropical climates exceeding 85 % RH.
In binder-jetting processes that fabricate alumina ceramic cores for investment casting, BP-17S serves as the water-soluble binder printed onto 10 µm median particle size alumina powder at a jetting resolution of 1 200 dpi. The binder fluid consists of 8 wt% BP-17S in deionised water with 0.5 wt% isopropanol to reduce dynamic surface tension to 35 mN·m⁻¹, ensuring that the droplet impact spreads to 70–80 µm diameter without satellite droplets. After a layer thickness of 100 µm is printed, infrared preheating at 55 °C evaporates 70 % of the liquid carrier before the next powder bed pass, building a green body with a compressive strength of 3.2–4.5 MPa measured by ASTM C773-88 (reapproved 2020). The burnout cycle must be carefully ramped: heating at 0.5 °C·min⁻¹ from 200 °C to 450 °C under flowing nitrogen at 2 L·min⁻¹ eliminates the PVOH without carbonaceous residues that would otherwise cause porosity defects above 0.5 % in the sintered alumina. Disposal of unused binder follows local water authority mandates; BP-17S solution shows a BOD₅/COD ratio of 0.12, classifying it as inherently biodegradable under OECD 302B.
Competitive CCP PVA BP-17S prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615380400285 or mail to sales2@liwei-chem.com.
We will respond to you as soon as possible.
Tel: +8615380400285
Email: sales2@liwei-chem.com
Flexible payment, competitive price, premium service - Inquire now!
CCP PVA BP‑17S is a partially hydrolyzed polyvinyl alcohol resin manufactured through continuous alcoholysis of polyvinyl acetate under controlled alkalinity. Its nominal degree of hydrolysis spans 87–89 mol% and the average degree of polymerization is 1,700–1,800, producing a 4 % aqueous solution viscosity of 25–31 mPa·s when measured at 20 °C with a Brookfield RVT viscometer (spindle #2, 20 rpm) following JIS K6726. The resin is supplied as a white, free‑flowing powder with a bulk density of typically 0.4–0.6 g/cm³ and a residual volatile content not exceeding 5 % when dried to constant mass at 105 °C. A condensed set of typical physical‑chemical benchmarks is given below.
| Property | Nominal Value Range | Test Standard |
|---|---|---|
| Degree of hydrolysis | 87–89 mol% | JIS K6726 (saponification titration) |
| Average degree of polymerization | 1,700–1,800 | Calculated from 4 % solution viscosity via JIS K6726 |
| Viscosity (4 % aq., 20 °C) | 25–31 mPa·s | JIS K6726, Brookfield spindle #2, 20 rpm |
| Ash content (as Na₂O) | ≤ 0.3 % | JIS K6726 (ignition at 700 °C) |
| pH (4 % aqueous solution) | 5.0–7.0 | JIS K6726 |
| Volatile matter | ≤ 5.0 % | JIS K6726 (105 °C, 3 h) |
The combination of an intermediate hydrolysis level and a medium‑high polymerization degree dictates the aqueous dissolution kinetics and rheological fingerprint. BP‑17S disperses rapidly in cold water (20–25 °C) without the extended heating required for fully hydrolysed grades; a translucent solution is obtained after stirring for 30–60 min at moderate shear. The apparent viscosity of a 10 % solution at 20 °C typically lies in the range 1 500–2 500 mPa·s, reflecting strong inter‑chain hydrogen bonding through residual acetate groups which disrupt crystallinity while preserving enough hydroxyl functionality for extensive water interaction. Above 15 % solids, the solution exhibits pronounced shear‑thinning behaviour and a measurable first normal stress difference in rotational rheometry (ISO 3219). The Huggins constant obtained from dilute‑solution capillary viscometry (ISO 1628-3) is on the order of 0.5–0.6, indicating a moderately good solvent environment at ambient temperature. When the solution is cooled below 10 °C, gelation can occur if the concentration exceeds 12 %, a threshold that shifts to lower solids with increased hydrolysis or higher molecular weight. In high‑shear make‑down equipment—a rotor‑stator device operating at 3 000 rpm—the addition rate of powder to the vortex must be controlled at 10–12 kg/min for a 500 L vessel to avoid the formation of partially hydrated agglomerates; once formed, these fish‑eyes cannot be fully eliminated without prolonged heating above 80 °C.
In emulsion polymerization, BP‑17S functions as a protective colloid through a graft‑stabilization mechanism that is highly sensitive to both molecular weight and residual acetate content. During vinyl acetate homopolymerization initiated by a water‑soluble persulfate (0.1–0.5 wt% on monomer), the 1,2‑diol and terminal carbonyl groups on the PVA backbone serve as sites for hydrogen abstraction, generating polymer‑radicals that graft vinyl acetate branches onto the PVA. Grafting efficiencies measured by selective solvent extraction under 60 °C reflux typically reach 45–75 % for a 88 mol% hydrolysis grade, falling to below 30 % when hydrolysis drops to 80 mol% and decreasing to 50–60 % when it exceeds 92 mol% due to reduced backbone solubility in the monomer‑swollen particle. The grafted copolymer locates at the particle‑water interface, providing electrosteric stabilization; zeta‑potential values measured in 0.01 M KCl remain around −5 to −12 mV, so the principal repulsive contribution is steric. Particle size distributions measured by dynamic light scattering after 4 h of semi‑batch feed exhibit a monomodal character with a z‑average diameter of 200–400 nm when BP‑17S is used at 4–6 wt% based on total monomer. A lower‑molecular‑weight analog such as CCP PVA BP‑05 (degree of polymerization ≈500, identical hydrolysis window) yields smaller primary particles but provides insufficient mechanical stability during high‑shear let‑down; shear‑induced coagulation is observed in a Cowles disperser at tip speeds above 12 m/s, whereas BP‑17S‑stabilized latices tolerate at least 18 m/s before significant grit formation occurs. Conversely, the fully hydrolysed grade CCP PVA BF‑17 (hydrolysis ≥98 mol%) requires dissolution at 85–95 °C and, when used as sole colloid, generates coarse particles with broad polydispersity because the dense grafting layer retards radical entry and chain propagation at the particle surface. The narrow processing window for BP‑17S in vinyl acetate‑acrylic copolymerizations spans 60–75 °C; at temperatures above 80 °C the grafting density declines, and residual ungrafted PVA can phase‑separate as gel domains during neutralization to pH 8–9.
Addition of a 10 % pre‑dissolved BP‑17S solution to the reactor heel along with deionized water and a non‑ionic surfactant (0.2–0.5 phm) establishes an initial viscosity plateau of 80–150 mPa·s at 60 °C. Upon commencement of the monomer feed, the torque on an anchor agitator (60 rpm) climbs within 20–30 min as the particle number concentration surpasses 10¹⁵ particles/mL. A batch‑to‑batch variation in PVA degree of hydrolysis of only ±0.3 mol% has been correlated with a ±18 nm shift in the final latex particle size in a 2 000 L production reactor, underscoring the need for tight incoming quality control. Operators report that the delayed addition of the PVA stream—introducing 70 % of the total colloid only after 30 % monomer conversion—narrows the particle size distribution and raises the film‑forming minimum film‑formation temperature to ≈3 °C above that of a single‑shot charge, a useful lever for pressure‑sensitive adhesive rheology.
Cast films of BP‑17S dried from aqueous solution exhibit a tensile strength at break of 35–45 MPa and an elongation at break of 150–250 % when tested according to ASTM D882 (50 µm thickness, crosshead speed 50 mm/min). The film displays a glass‑transition temperature of approximately 85 °C by differential scanning calorimetry (10 K/min heating rate, second scan), and the water contact angle after 24 h conditioning is 52–58°, confirming a hydrophilic surface that can be heat‑sealed to paper and cellulosic substrates at 120–140 °C under 0.3 MPa pressure. At equilibrium moisture uptake (≈8–10 wt% at 50 % RH), the tensile modulus drops to roughly 60 % of the dry value, a property that must be accommodated when the grade is specified for water‑soluble packaging or embroidery stabilizers. Films plasticized with 10 % glycerol show a drop in Tg to 45 °C and an increase in elongation to 400 %, but the plasticizer migrates over 30 days to the surface under 40 °C, 75 % RH storage, limiting long‑term flexibility.
The “S” suffix in BP‑17S designates a low‑ash variant produced by intensified washing steps. Ash content is controlled to ≤ 0.3 % versus ≤ 0.5 % for the standard BP‑17 grade, a difference that reduces the yellowness index of aqueous solutions measured per ASTM E313 by 2–3 units and virtually eliminates insoluble gel specks in 50 µm adhesive films. In heat‑seal adhesives applied to medical packaging, the lower ionic residue retards corrosion on aluminium foil under accelerated aging at 60 °C and 90 % RH; pit formation observed by optical microscopy after 14 days is <5 pits/cm² compared with 15–25 pits/cm² for the higher‑ash homologue. The clarity of the 4 % solution, measured as percent transmittance at 550 nm wavelength, attains ≥95 % 10 min after dissolution completion, making the grade suitable for over‑print varnishes where haze must remain below 2 %.
| Regulation / Directive | Compliance Status | Reference |
|---|---|---|
| EU 10/2011 (plastics intended for food contact) | Compliant as polymeric additive | Migration limit 60 mg/kg (overall migration, EN 1186) |
| FDA 21 CFR 175.105 (adhesives) | Component permissible | Subject to good manufacturing practice |
| FDA 21 CFR 176.170 (paper and paperboard) | Compliant for aqueous applications | Extractives limited by intended use |
| REACH (EC 1907/2006) | Substance registered | No SVHC content above 0.1 % w/w |
| RoHS (2011/65/EU) | Not within direct scope; does not contain restricted substances | Lead, mercury, cadmium, Cr(VI), PBB/PBDE below detection |
Polyethylene‑lined multi‑wall paper bags should be stored in a dry environment at <25 °C and <60 % relative humidity. The product forms flammable dust‑air mixtures; conveying and blending equipment must be electrically grounded and located in areas classified as Zone 21 under IEC 60079‑10‑2.
