BYK-358 N

BYK-358 N is a solution of polyacrylate copolymer. 
BYK-358 N acts as a leveling agent for solvent-borne and solvent-free systems. 
BYK-358 N offers improved leveling and gloss.

CAS Number: 2493-02-9
Molecular Formula: C7H4BrNO
Molecular Weight: 198.02
EINECS Number: 219-662-9

Synonyms: P-BROMOPHENYL ISOCYANATE;p-Bromophenylcarbonimide;1-bromo-4-isocyanato-benzen;1-Bromo-4-isocyanatobenzene;Benzene, 1-bromo-4-isocyanato-;Isocyanic acid p-bromophenyl ester;isocyanicacid,p-bromophenylester;p-Bromocarbanil 

BYK-358 N does not causes turbidity in clears and hazing in pigmented systems. 
Produces a long wave effect and avoids cratering. 
Suitable for high-quality pigmented and non-pigmented industrial coatings. 

BYK-358 N is a high-performance silicone-containing surface additive designed to improve slip, surface smoothness, and leveling in a wide range of coating systems.
It is typically used in solvent-borne, aqueous, and UV-curable coatings to enhance surface flow and reduce surface defects such as craters, pinholes, and uneven film formation.
Its silicone structure allows it to migrate to the coating surface, where it forms a lubricating layer that improves surface properties.

The additive reduces the coefficient of friction on coated surfaces, giving them a smoother and more scratch-resistant finish.
This improved slip behavior helps prevent damage during manufacturing, handling, packaging, and transportation of coated materials.
These performance enhancements are especially valuable for wood coatings, industrial coatings, automotive coatings, and plastic coatings.

BYK-358 N enhances leveling by reducing surface tension differences within the coating film as it levels during drying or curing.
This effect helps eliminate visible surface irregularities and contributes to a more uniform, glossy appearance.
The result is a smoother, defect-free coated film that meets higher aesthetic and quality standards.

The product is compatible with many resin systems and can be added at low dosages, making it efficient and cost-effective in formulations.
Its high compatibility ensures that it does not adversely affect film transparency, color stability, or curing behavior.
This makes it suitable for use in clear coats, pigmented systems, and high-performance industrial finishes.

Because BYK-358 N contains silicone, it also provides excellent anti-blocking behavior by preventing coated surfaces from sticking together under pressure or heat.
This property is useful for stacked or rolled materials such as coated metal sheets, protective films, and packaging substrates.
The reduced tackiness improves handling and storage efficiency in production environments.

BYK-358 N is formulated to provide long-lasting slip enhancement without causing surface defects that are common with traditional silicone additives.
Its controlled migration ensures that the additive enriches the uppermost layer of the coating film only to the degree required for optimal performance.
This balanced behavior helps maintain coating integrity while still improving tactile smoothness and scratch resistance.

The additive is frequently used to prevent micro-foam formation during coating application, especially in high-speed industrial processes.
It stabilizes the coating surface by reducing surface tension variations that contribute to bubble formation.
This leads to higher-quality films with better clarity and fewer surface imperfections.

BYK-358 N is widely used to improve mar resistance in coatings that are exposed to physical contact or abrasion.
The silicone-modified surface reduces the visibility of scuffs, fingerprints, and handling marks on the finished product.
This makes it ideal for consumer goods, furniture coatings, and decorative finishes requiring long-lasting visual appeal.

Melting point: 42–44 °C (lit.)
Boiling point: 158 °C / 14 mm Hg (lit.)
Density: 1.6077 (rough estimate)
Refractive index: 1.5500 (estimate)
Flash point: 229 °F
Storage temp.: Refrigerator (+4 °C)
Solubility: Very slightly soluble in diethyl ether
Form: Crystalline solid
Color: White to light beige
Water solubility: Sparingly soluble in water (0.40 g/L at 25 °C)
Sensitive: Moisture sensitive
Merck: 14,1430
BRN: 508203

BYK-358 N is polyacrylate-based anti-cratering and leveling additive for all solvent-borne and solvent-free systems. 
BYK-358 N provides a minor reduction of the surface tension and facilitates the acceptance of spray mist and dust.
It does not cause turbidity in non-pigmented systems or haze in pigmented systems.

Suitable for all ambient curing resin systems such as unsaturated polyester resins and epoxy resins.
BYK-358 N is a solution of a polyacrylate that can be used as an anti-cratering and leveling additive in all solvent-borne coatings. 
It increases gloss and gives the coatings a long wave effect. 

BYK-358 N only causes a minor reduction in surface tension and does not negatively influence the recoatability and intercoat adhesion. 
BYK-358 N is suited for high quality pigmented and non-pigmented industrial coatings. 
BYK-358 N does not cause turbidity in clear coats or haze in pigmented systems. 

BYK-358 N is also used in plastic coatings where it helps reduce stick-slip behavior that can occur on polymer surfaces.
This enhancement contributes to smoother interactions between coated surfaces and moving components in industrial or consumer applications.
Such performance benefits are valuable in automotive interiors, appliance housings, and electronic device coatings.

BYK-358 N helps improve sprayability and application flow in coatings applied via spray equipment.
By promoting even film formation during atomization and drying, it reduces the risk of sagging, orange peel, and surface waviness.
These improvements result in better coating efficiency and reduced rework in industrial finishing lines.

The additive is often used in UV-curable coatings because it does not interfere with rapid curing mechanisms or cause surface irregularities after polymerization.
Its ability to maintain slip and leveling properties even under fast-curing conditions makes it highly suitable for high-speed production environments.
This compatibility supports advanced finishing technologies used in electronics, flooring, and precision-coated components.

BYK-358 N can also be blended with other surface modifiers to create synergistic effects that further enhance gloss, smoothness, and mechanical durability.
These combinations allow formulators to fine-tune coating behavior depending on the application's aesthetic or functional requirements.
Such adaptability makes it a valuable component in premium multi-additive coating systems.

Uses Of BYK-358 N:
BYK-358 N is used in the synthesis of mixed bisamide derivative and monoamide product.
BYK-358 N is widely used as a slip additive in coatings to reduce surface friction and create smoother, more touch-friendly coated surfaces.
Its silicone-based structure migrates to the surface and forms a lubricating layer that improves glide, feel, and handling performance.

This makes it valuable in wood coatings, plastic coatings, industrial finishes, and consumer product coatings.
The additive is used to enhance scratch and mar resistance by preventing minor mechanical contacts from leaving visible marks on the coating.
Its surface-modifying properties help coated products maintain a clean, polished appearance even under frequent use.

These benefits make it suitable for furniture coatings, decorative surfaces, and high-contact consumer goods.
BYK-358 N is frequently used in automotive and industrial coatings to improve surface leveling and eliminate defects such as craters, flow lines, and irregular texture.
By reducing surface tension gradients, it supports the formation of uniform and high-gloss coatings during application and curing.

This leads to visually superior finishes that meet demanding aesthetic and performance requirements.
The additive is used in UV-curable coatings because it maintains its slip and leveling performance even under rapid curing conditions.
Its compatibility with UV systems allows manufacturers to produce high-quality films in fast production environments without surface disruptions.

This makes it ideal for electronics coatings, flooring systems, and precision-coated components.
BYK-358 N is used in printing and packaging coatings to prevent blocking, where two coated surfaces stick together under heat or pressure.
Its silicone-enriched surface layer reduces tackiness and ensures that printed materials can be stacked, rolled, or transported without adhesion issues.

This is especially beneficial for packaging films, coated papers, and label materials.
The additive is also used to prevent foam formation and surface disturbances during application processes such as spraying, rolling, and dipping.
Its surface-tension-modifying behavior stabilizes the coating and reduces bubble formation that can compromise appearance.

This makes it useful in high-speed industrial coating lines that require consistent surface quality.
BYK-358 N is employed alongside other additives to fine-tune formulation properties without affecting clarity, gloss, color stability, or cure behavior.
Its high compatibility allows it to be incorporated into clear coats, pigmented systems, and specialty functional coatings.

This versatility makes it a preferred additive in multi-component high-performance coating systems.
BYK-358 N is used in furniture and parquet coatings to enhance the slip properties of wooden surfaces, making them more resistant to everyday wear and mechanical contact.
The silicone modification helps reduce the appearance of drag marks left by cleaning tools, shoes, or moving objects.

These improvements give wooden surfaces a more durable and visually appealing finish over extended use.
The additive is utilized in plastic component coatings where materials must slide against each other smoothly, such as in automotive interiors or appliance housings.
Its surface-modifying effect minimizes frictional noise and reduces the likelihood of sticking between moving plastic parts.

These benefits are essential for high-precision components that require both functional smoothness and long-term durability.
BYK-358 N is incorporated into electronic device coatings to prevent fingerprint marks and smudging caused by frequent handling.
The silicone layer helps repel oils and reduces visible surface contamination, maintaining a clean appearance for longer periods.

This makes it useful for screens, housings, buttons, and other high-contact surfaces in consumer electronics.
The additive is used in high-speed spray-applied coatings to ensure uniform wetting and smooth film formation across large or complex surfaces.
Its surface tension-reducing behavior helps coatings spread evenly without defects, even in demanding industrial processes.

This provides more consistent visual and functional performance in automotive parts, machinery components, and metal substrates.
BYK-358 N is often applied in packaging coatings for films and laminates to improve their handling, stacking, and converting properties.
The improved slip reduces friction during machine processing, allowing films to pass through rollers and cutting systems more easily.

These advantages help increase production speed and reduce mechanical wear in packaging lines.
The additive is used in ink systems to reduce surface defects that may arise during drying or curing of printed layers.
Its ability to control surface flow ensures sharper print boundaries and smoother ink distribution.

This results in higher print quality for labels, flexible packaging, and decorative printing applications.
BYK-358 N is added to coil coatings and metal coatings where smoothness, anti-blocking, and scratch resistance are essential for storage and transport.

Its silicone-enriched layer prevents coated metal sheets from sticking together when stacked or coiled tightly.
This ensures that the coating surface remains intact and free from damage during industrial handling.

Safety Profile Of BYK-358 N:
BYK-358 N is generally considered a low-hazard additive, but it can cause mild skin irritation if it comes into prolonged contact with unprotected skin.
The irritation usually presents as dryness or slight redness because the formulation contains silicone-modified components and wetting agents.
Using protective gloves during handling helps reduce unnecessary skin exposure.

The product may cause temporary eye irritation if splashes occur during mixing, transferring, or spraying operations.
Its surface-active components can disrupt the natural tear film and lead to stinging, watering, or mild redness.
Wearing protective goggles is recommended when working in environments where splashes or aerosol mist may occur.

Inhalation of fine mist or vapor generated during application—especially in spray processes—may irritate the respiratory tract.
Workers may experience coughing, throat dryness, or slight breathing discomfort if ventilation is inadequate.
Good air circulation and appropriate respiratory protection help maintain safe conditions in production areas.

Spills of BYK-358 N can create slippery surfaces if not cleaned promptly because its silicone nature forms a low-friction film when dried.
This slippery residue can increase the risk of falls or accidents around coating equipment and storage areas.
Immediate cleaning with water and detergent helps reduce slip hazards and maintain a safe workspace.

BYK-358 N may thicken or degrade if stored outside its recommended temperature range, which can lead to pressure buildup in sealed containers.
Such instability can also cause blockages in pumps, hoses, and spray nozzles during industrial application.
Following proper storage guidelines reduces these equipment-related hazards.