paper pulp chemicals

Hydroxyethyl Starch (Coating Grade)

Hydroxyethyl starch is an etherified starch produced by reacting native starch with ethylene oxide, resulting in improved cold-water solubility, lower retrogradation tendency, and better film clarity. It is used in paper coating formulations as a co-binder and rheology modifier, providing excellent film formation and pigment binding in high-speed coating operations.

paper pulp chemicals

Kaolin Clay (Paper Coating & Filler Grade)

CAS: 1332-58-7

Kaolin clay (hydrated aluminum silicate) is the primary coating pigment used in paper and board manufacturing, providing excellent gloss, printability, and ink receptivity. Its platelet morphology creates a smooth, dense surface ideal for offset, gravure, and digital printing. Calcined and delaminated grades offer enhanced brightness and opacity for premium coated paper applications.

paper pulp chemicals

Optical Brightening Agent VBL (Stilbene-Type OBA)

CAS: 4404-43-7

Optical brightening agent VBL is a stilbene-type fluorescent whitening agent with strong affinity for cellulose fibers, making it particularly effective when applied at the paper wet end or size press. It provides significant brightness and whiteness improvement to paper and textile substrates. VBL offers excellent color fastness to light and is compatible with both acidic and alkaline papermaking conditions.

paper pulp chemicals

Oxidized Starch (Surface Sizing Grade)

CAS: 65996-62-5

Oxidized starch is a chemically modified starch produced by oxidation with hypochlorite, giving it lower viscosity and better film-forming properties than native starch. It is widely used as a surface sizing agent applied at the size press or film press of paper machines. Oxidized starch improves surface strength, printability, and smoothness of paper and board.

paper pulp chemicals

Peracetic Acid (TCF Bleaching Agent)

CAS: 79-21-0

Peracetic acid (PAA) is an oxidative bleaching agent used in totally chlorine-free (TCF) pulp bleaching sequences. It effectively removes residual lignin and brightens pulp without generating chlorinated compounds in the effluent, making it highly suitable for environmentally sensitive kraft and sulfite pulp applications. PAA is also used for microbiological control in paper mill white water systems.

paper pulp chemicals

Poly-DADMAC (Polydiallyldimethylammonium Chloride)

Poly-DADMAC (polydiallyldimethylammonium chloride) is a high-charge-density cationic polyelectrolyte widely used in papermaking as a fixative for anionic substances, a coagulant for dissolved and colloidal material, and a drainage and retention aid. Its strong permanent cationic charge neutralizes anionic colloidal substances (ACS) in the white water loop, improving sizing efficiency and reducing chemical demand.

paper pulp chemicals

Polyaluminum Chloride (PAC, Paper Grade)

CAS: 1327-41-9

Polyaluminum chloride (PAC) is a highly effective inorganic coagulant used in papermaking wet end and wastewater treatment. Its pre-hydrolyzed polymeric aluminum species provide superior charge neutralization and coagulation of colloidal substances compared to conventional alum, and are effective over a wider pH range (5–9). PAC improves retention, drainage, and formation while also functioning as a fixative for anionic substances in the furnish.

paper pulp chemicals

Polyamidoamine-Epichlorohydrin Resin (PAE Wet Strength Resin)

CAS: 25152-84-5

Polyamidoamine-epichlorohydrin (PAE) resin is the leading wet strength resin for papermaking, providing permanent wet tensile and burst strength to paper and tissue products. It forms covalent cross-links with cellulose under curing conditions, ensuring paper retains its mechanical strength when wet. PAE is non-formaldehyde, environmentally acceptable, and effective across a wide pH range.

paper pulp chemicals

Polymer-Based Antifoam (Paper Machine Grade)

Polymer-based antifoams for paper machine systems are non-silicone defoamers formulated with mineral oils, fatty acid esters, or polyol-based active components. They control foam in white water systems, stock preparation, and headboxes without the wire contamination and staining risks associated with silicone antifoams. These water-dispersible formulations provide rapid foam knockdown and extended foam prevention in the paper machine wet end.

paper pulp chemicals

Polyphosphate Dispersant (Talc & Pitch Control)

Polyphosphate-based dispersants are used in papermaking to stabilize mineral slurry dispersions (calcium carbonate, kaolin, talc) and to control pitch and stickies deposition on paper machine surfaces. They prevent agglomeration of mineral particles in coating colors and filling slurries, ensuring uniform dispersion and stable viscosity. They also act as scale inhibitors for calcium carbonate deposits in white water systems.

paper pulp chemicals

Polyurethane Binder (Specialty Paper & Nonwovens)

Waterborne polyurethane (WPU) binders are used in specialty paper and nonwoven manufacturing to provide superior mechanical strength, flexibility, and durability to paper substrates and fiber mats. They are applied in specialty technical papers, filter papers, medical papers, and composite nonwoven fabrics where conventional cellulose-based binders are insufficient. Polyurethane binders offer excellent abrasion resistance, wet strength, and chemical resistance.

paper pulp chemicals

Polyvinyl Alcohol (Paper & Coating Grade)

CAS: 9002-89-5

Polyvinyl alcohol (PVA) is a water-soluble polymer used in papermaking as a surface sizing agent, coating binder, and barrier additive. It forms strong, flexible films on paper surfaces, enhancing surface strength, oil and grease resistance, and printability. PVA is also used as a co-binder in pigment coating formulations to improve coating hold-out and gloss.

paper pulp chemicals

Precipitated Calcium Carbonate (PCC, Paper Grade)

CAS: 471-34-1

Precipitated calcium carbonate (PCC) is a synthetically produced, high-purity filler and coating pigment used extensively in alkaline papermaking. Its scalenohedral, aragonitic, or cubic crystal morphologies can be tailored to optimize paper brightness, opacity, bulk, and printability. PCC enables cost reduction by replacing fiber while maintaining or improving paper quality.

paper pulp chemicals

Precipitated Silica Filler (Paper Grade)

CAS: 7631-86-9

Precipitated silica (fine particle amorphous silica) is used in paper manufacturing as a functional filler to improve opacity, printability, and ink absorbency. Its high surface area and porous structure enhance ink drying speed and color density on uncoated and coated paper grades. It is particularly valued in inkjet, thermal, and carbonless paper applications.

paper pulp chemicals

Rosin Size Emulsion

CAS: 8050-09-7

Rosin size emulsion is a traditional acidic internal sizing agent derived from natural rosin, used primarily in acidic papermaking systems with alum as the fixing agent. It provides good water resistance and printability at economical cost. Fortified rosin sizes offer improved sizing efficiency and are available in both anionic and cationic forms.

paper pulp chemicals

Slimicide Isothiazolinone (Paper Machine Biocide)

Isothiazolinone-based slimicides are broad-spectrum biocides used in paper mill white water systems, stock preparation, and coating kitchens to control microbial slime, bacterial deposits, and biofilm formation. Uncontrolled microbial growth in papermaking systems causes sheet breaks, holes, odor problems, and chemical failures. These biocides provide effective control against bacteria, fungi, and algae at low use levels.

paper pulp chemicals

Sodium Dithionite (Sodium Hydrosulfite)

CAS: 7775-14-6

Sodium dithionite (sodium hydrosulfite) is a powerful reductive bleaching agent used primarily for brightening mechanical pulps such as groundwood, thermomechanical pulp (TMP), and chemithermomechanical pulp (CTMP). It selectively reduces chromophoric groups in lignin without significant fiber degradation, providing rapid and effective brightness gain. It is also used in recycled fiber deinking and newsprint brightening.

paper pulp chemicals

Sodium Hydroxide (Pulping & Bleaching Grade)

CAS: 1310-73-2

Sodium hydroxide (caustic soda) is a fundamental chemical in pulp and paper manufacturing, used in kraft pulping as part of white liquor, in alkaline extraction stages during bleaching, and in pH adjustment throughout the papermaking process. It dissolves lignin from wood chips during cooking and facilitates the regeneration of pulping chemicals in the kraft recovery cycle.

paper pulp chemicals

Sodium Hypochlorite Solution (Pulp Bleaching Grade)

CAS: 7681-52-9

Sodium hypochlorite is a chlorine-based oxidizing bleaching agent used in the bleaching of chemical and mechanical pulps. It effectively removes residual lignin and chromophores, increasing pulp brightness. In modern elemental chlorine-free (ECF) bleaching sequences, it can serve as a supplemental brightening stage alongside chlorine dioxide and peroxide.

paper pulp chemicals

Sodium Silicate (Peroxide Bleaching Stabilizer)

CAS: 1344-09-8

Sodium silicate (waterglass) serves as an essential stabilizer in alkaline hydrogen peroxide bleaching of mechanical and recycled pulps. It deactivates heavy metal ions (Mn, Fe, Cu) that catalyze the decomposition of hydrogen peroxide, ensuring efficient utilization of the oxidant for brightness gain. Sodium silicate also provides alkalinity buffering and contributes to the dispersing and saponifying of ink during deinking.

paper pulp chemicals

Stickies Control Agent (Cationic Fixative)

Stickies control agents are cationic polymers or specialized dispersants used to passivate and fix sticky contaminants (pressure-sensitive adhesives, hot melts, and coatings residues) in recycled fiber systems. They prevent stickies from depositing on paper machine fabrics, rolls, and wires, which cause sheet defects, breaks, and costly cleaning downtime. These agents are critical for mills using high proportions of recovered paper furnish.

paper pulp chemicals

Styrene-Butadiene Latex (SB Latex, Paper Coating Grade)

CAS: 9003-55-8

Styrene-butadiene (SB) latex is the primary binder in paper and board coating formulations, providing adhesion between pigment particles and fiber, as well as cohesion within the coating layer. It imparts excellent printability, gloss, and surface strength to coated papers. SB latex is used in combination with co-binders such as starch or CMC, and is the dominant coating binder globally for offset, gravure, and digital printing papers.

paper pulp chemicals

Talc (Paper Grade — Pitch Control & Filler)

CAS: 14807-96-6

Talc is a naturally occurring magnesium silicate mineral used in papermaking as a pitch control agent and functional filler. Its hydrophobic platelet structure adsorbs sticky resin and pitch particles from wood pulp, preventing deposition on paper machine components. As a filler, talc contributes to paper opacity, smoothness, and reduced linting during printing.

paper pulp chemicals

Titanium Dioxide (Paper & Laminate Grade)

CAS: 13463-67-7

Titanium dioxide (TiO₂) is the most effective white pigment for opacity and brightness in paper manufacturing. It is used in decorative laminates, specialty papers, banknote paper, and high-quality printing papers where maximum opacity at minimum basis weight is required. TiO₂ scatters visible light far more efficiently than any other mineral filler, enabling production of thin, opaque paper grades.