Fluorescent Brightener 184 (Optical Brightener OB / BBOT) – CAS 7128-64-5 | Finetech Industry Limited

Product Name: Fluorescent Brightener 184 / Optical Brightener OB / BBOT

CAS Registry Number: 7128-64-5

Product Code: FT-0610265

Purity: ≥98.0% (HPLC)

Appearance: Yellowish-green powder

packing:1kg,25kg

1. Product Overview & Key Technical Specifications

Fluorescent Brightener 184 (CAS 7128-64-5), widely known as Optical Brightener OB or BBOT, is a high-performance benzoxazole-based fluorescent whitening agent.

Chemically named 2,5-Bis(5-tert-butyl-2-benzoxazolyl)thiophene, this organic brightener absorbs ultraviolet (UV) light and re-emits it as visible blue fluorescence, effectively masking yellow tones and increasing perceived whiteness and brightness in polymers, coatings, and synthetic fibers.

Technical Data Sheet (TDS) & Specifications

Note: The absorption and emission wavelengths are representative reference values and may vary depending on measurement conditions.

2. Optical Mechanism: How Optical Brightener OB Works

Unlike traditional white pigments, such as titanium dioxide (TiO₂), which primarily provide opacity and light scattering, Optical Brightener OB functions through photoluminescence.

The optical brightening process involves three principal mechanisms:

1. UV Absorption

The extended conjugated molecular structure of Fluorescent Brightener 184 absorbs ultraviolet radiation, typically in the region of 370–380 nm.

2. Blue Fluorescence Emission

Following UV excitation, part of the absorbed energy is re-emitted as visible blue fluorescence, with a representative emission maximum near 435 nm.

3. Optical Color Correction

The emitted blue light helps compensate for yellowish tones in organic polymer matrices, producing an enhanced perception of whiteness and brightness.

The resulting optical performance depends on the surrounding polymer matrix, additive concentration, processing conditions, and illumination environment.

3. Industrial Applications of Fluorescent Brightener 184

Finetech Industry Limited supplies Fluorescent Brightener 184 (FT-0610265) for applications in polymer processing, plastics manufacturing, coatings, and related industrial formulations.

3.1 Plastics & Thermoplastics Processing

Optical Brightener OB is used in various thermoplastic formulations where improved optical whiteness and brightness are required.

Potential applications include:

Polyolefins

1. Polyethylene (PE)
2. Polypropylene (PP)
3. Plastic films and sheets
4. Polymer masterbatches
5. Injection-molded products

Engineering Plastics

1. Polycarbonate (PC)
2. Polyamides (Nylon)
3. Polyesters (PET/PBT)
4. Acrylonitrile Butadiene Styrene (ABS)
5. Polystyrene (PS)

Flexible & Rigid PVC

1. PVC pipes and profiles
2. Plastic sheets
3. Synthetic leather
4. Extruded PVC products

Thermoplastic Polyurethanes (TPU)

1. Footwear soles
2. Extruded tubes
3. Elastomeric components

Optical Brightener OB can help improve the appearance of suitable polymer formulations by reducing perceived yellowing and increasing visual brightness.

Its compatibility and thermal performance should be evaluated under the intended manufacturing conditions.

3.2 Coatings, Inks, and Lacquers

Fluorescent Brightener 184 may also be incorporated into selected coating and printing ink formulations.

Clear and Pigmented Coatings

The additive can enhance perceived brightness and provide optical color correction in suitable industrial coatings and lacquer systems.

Printing Inks

Optical Brightener OB may be used to improve visual brightness in selected printing ink formulations and coated substrates.

Performance depends on the resin system, pigment composition, coating thickness, and ultraviolet light exposure.

3.3 Synthetic Fibers & Monofilaments

Fluorescent Brightener 184 may be evaluated in synthetic fiber and polymer filament applications, including:

1. Polyester (PET) fibers
2. Nylon fibers
3. Acrylic fibers
4. Synthetic monofilaments

In suitable formulations, the additive can contribute to improved perceived whiteness and brightness.

Uniform dispersion and application-specific lightfastness testing are important for maintaining consistent optical performance.

4. Formulation & Processing Guidelines

Appropriate formulation and processing conditions are essential for obtaining effective optical brightening performance.

Recommended Dosage

A representative starting concentration for formulation trials is:

0.01%–0.05% (100–500 ppm), based on polymer weight.

This range is provided as a general formulation reference rather than a guaranteed optimum for every polymer system.

The appropriate concentration should be determined through application-specific testing.

Over-Concentration Considerations

Excessive additive loading may result in:

1. Concentration quenching
2. Molecular aggregation
3. Reduced fluorescence efficiency
4. Undesirable greenish-yellow coloration
5. Increased formulation cost without proportional optical improvement

Dispersion and Processing

Thorough premixing or masterbatch compounding is recommended to promote uniform additive distribution.

Processing parameters should be optimized according to the polymer type, processing temperature, residence time, and required optical performance.

5. Quality Control & Analytical Verification

Quality consistency is an important consideration when sourcing Fluorescent Brightener 184 (CAS 7128-64-5) for industrial applications.

Finetech Industry Limited specifies the following product characteristics:

Purity (HPLC): ≥98.0%

Appearance: Yellowish-green powder

High-Performance Liquid Chromatography (HPLC)

HPLC can be used to determine chromatographic purity and evaluate relevant organic impurities.

Nuclear Magnetic Resonance (NMR)

Proton nuclear magnetic resonance (¹H NMR) may be used to support structural identification and confirm the expected chemical characteristics.

Certificate of Analysis (COA) & Safety Data Sheet (SDS)

Customers may request relevant quality and safety documentation, including:

1. Certificate of Analysis (COA)
2. Safety Data Sheet (SDS)
3. Technical Data Sheet (TDS), where available
4. Additional analytical information, subject to availability

Batch-specific analytical results and documentation requirements should be confirmed before ordering.

6. Frequently Asked Questions (FAQ)

Q1: What is the CAS number for Optical Brightener OB?

The CAS Registry Number for Optical Brightener OB, also known as C.I. Fluorescent Brightener 184 or BBOT, is 7128-64-5.

Q2: Is Optical Brightener OB suitable for high-temperature polymer processing?

Optical Brightener OB is used in various thermoplastic applications, including selected engineering polymer formulations.

Its suitability for high-temperature processing depends on the specific polymer, processing temperature, residence time, and formulation conditions.

Compatibility and thermal stability should be verified under actual manufacturing conditions.

Q3: What is the difference between Optical Brightener OB and white pigments?

White pigments such as titanium dioxide (TiO₂) primarily provide opacity and light scattering.

Optical Brightener OB absorbs ultraviolet radiation and re-emits part of the absorbed energy as visible blue fluorescence, helping compensate for yellowish tones.

These materials may be used together to achieve complementary optical effects in suitable formulations.

Q4: What is the recommended dosage of Optical Brightener OB?

A representative starting dosage for formulation trials is 0.01%–0.05% (100–500 ppm) based on polymer weight.

The optimum concentration depends on the polymer matrix, processing conditions, and desired optical performance.

Q5: What is the purity of Finetech's Fluorescent Brightener 184?

Finetech Industry Limited specifies a minimum purity of 98.0% by HPLC for product FT-0610265.

Actual batch results should be confirmed using the relevant Certificate of Analysis.

Q6: How can I request a sample or quotation for FT-0610265?

Contact Finetech Industry Limited through the company's email or website inquiry form.

Please provide your required quantity, intended application, destination country, and any specific technical requirements.

Customers may also request information about available COA, SDS, packaging, and delivery options.

7. Procurement & Supply from Finetech Industry Limited

Finetech Industry Limited offers Fluorescent Brightener 184 (CAS 7128-64-5 / FT-0610265) for customers involved in plastics manufacturing, polymer compounding, coatings, synthetic fibers, and industrial materials research.

Product Supply Information

Product Identification

1. Product: Fluorescent Brightener 184
2. Alternative Names: Optical Brightener OB / BBOT
3. CAS Number: 7128-64-5
4. Product Code: FT-0610265

Quality Specifications

1. Purity: ≥98.0%
2. Appearance: Yellowish-green powder
3. Batch-specific analytical documentation: Available upon confirmation

Commercial Procurement

Customers may inquire about:

1. Product pricing and quotations
2. Sample availability
3. Bulk purchase requirements
4. Packaging options
5. International shipping arrangements
6. Technical and regulatory documentation

Availability, packaging specifications, delivery schedules, and commercial terms are subject to confirmation.

Request a Quotation for Fluorescent Brightener 184

Looking for a reliable Optical Brightener OB supplier or sourcing Fluorescent Brightener 184 in bulk?

Contact Finetech Industry Limited to discuss your procurement requirements.

Please include the following information in your inquiry:

1. Product Name: Fluorescent Brightener 184
2. CAS Number: 7128-64-5
3. Required Quantity
4. Destination Country
5. Intended Application
6. Required Documentation or Special Specifications

Contact Finetech Industry Limited today to request pricing, technical information, and supply availability for Fluorescent Brightener 184 (CAS 7128-64-5).