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Optical Brightener SWN
Product Name: Optical Brightener SWN / Fluorescent Brightener 140
Chemical Name:
7-(Diethylamino)-4-methyl-2H-chromen-2-one / 7-Diethylamino-4-methylcoumarin
Color Index: C.I. 140
CAS: 91-44-1
Molecular Formula: C₁₄H₁₇NO₂
Formula Weight: 231.29 g/mol
Synonyms: Fluorescent Brightener 140; FBA 140; 7-Diethylamino-4-methylcoumarin; Optical Brightener MDAC; Coumarin Derivative; Uvitex WGS; C.I. 140; Blankophor FBO; Kayaphor WN
Application:
Textiles (Wool, Silk, Nylon, Acetate, Acrylic), Plastics (PVC, H-PVC, S-PVC), Laundry Detergents, Paper Manufacturing, Paints & Coatings, Laser Dyes
Description
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1.Product Description
Achieve Brilliant, Long-Lasting Whiteness with Optical Brightener SWN – The Premium Coumarin-Based Brightener for Textiles and Plastics.
Optical Brightener SWN, internationally designated as Fluorescent Brightener 140 (C.I. 140), is a high-performance coumarin derivative that represents the gold standard for whitening applications requiring exceptional solubility in organic systems and superior lightfastness . This sophisticated non-ionic brightener features a unique 7-diethylamino-4-methylcoumarin molecular structure that delivers outstanding whitening efficacy across a diverse range of substrates.
The advanced molecular architecture of SWN enables superior photophysical performance: it absorbs invisible ultraviolet radiation and re-emits it as brilliant blue-violet visible light (presenting a purple tincture with red light emission), effectively neutralizing the natural yellowish cast of fibers, plastics, and coatings . With its excellent solubility in ethanol, acidic liquor, resins, and varnishes, SWN offers unique formulation flexibility that distinguishes it from water-soluble brighteners .
Key differentiators:
Coumarin-Based Chemistry: As a coumarin derivative, SWN offers exceptional lightfastness and thermal stability, making it ideal for applications requiring long-term whitening performance .
Superior Solvent Solubility: Readily soluble in ethanol, glycol, acidic liquor, resins, and varnishes, enabling use in solvent-based systems where water-soluble brighteners cannot be applied .
Excellent pH Stability: Demonstrates stable performance across a pH range of 3-11, with optimal whitening effect at pH 3-4 for textile applications .
Multi-Industry Versatility: Effective for wool, silk, nylon, acetate fibers, acrylic fibers, PVC plastics, detergents, and coatings .
Our Optical Brightener SWN is manufactured in accordance with HG/T 4034-2008 industry standards, offering ≥99% purity with consistent batch-to-batch performance, low moisture content (≤0.5%), and compliance with international quality requirements .
2. Product Specifications (Technical Data Sheet)
| Property | Specification | Insight |
| Product Name | Optical Brightener SWN (Fluorescent Brightener 140) | Premium coumarin-based brightener for textiles and plastics |
| Appearance | White to off-white crystalline powder | Free-flowing, fine powder with uniform crystal form |
| CAS No. | 91-44-1 (primary) / 61968-71-6 (alternative) | Verified chemical registry number |
| EINECS/EC No. | 202-068-9 | Listed in European inventory |
| Molecular Formula | C₁₄H₁₇NO₂ | 7-Diethylamino-4-methylcoumarin structure |
| Formula Weight | 231.28 - 231.29 g/mol | Precise molecular mass |
| Solubility | Soluble in ethanol, glycol, acidic liquor, resins, varnishes; Insoluble in water (0.006% solubility) | Excellent organic solubility; unique for non-aqueous systems |
| Ionic Style | Non-ionic | Compatible with anionic and cationic systems |
| Color Tone | Blue-purple to bluish; emits red light | Produces clean, bright white appearance |
| Purity | ≥ 99.0% (HPLC) | High purity ensures consistent performance |
| Melting Point | 69.5 - 73.0°C | Low melting point for easy incorporation |
| Moisture Content | ≤ 0.5% | Low moisture ensures stability |
| Volatile Content | ≤ 0.5% | Excellent stability during processing |
| Optimal pH Range | 3-11 (optimal: pH 3-4 for textiles) | Stable performance across broad spectrum |
| Fineness | >200 mesh | Fine particle size ensures uniform dispersion |
| Storage Conditions | Store in cool, dry, ventilated warehouse; avoid sunlight and moisture; protect from heat | Shelf life: 2-3 years under proper storage |
| Packing | 25 kg fiber drums / cardboard cartons with PE inner liner; custom sizes available | Secure, moisture-proof packaging |
| Application | Wool, silk, nylon, acetate, acrylic, PVC plastics, detergents, coatings | Versatile across multiple industries |
3.Product Application
Textile Industry – Primary Application:
Optical Brightener SWN is the preferred whitening agent for protein and synthetic fibers, delivering exceptional performance across various application methods :
| Fiber Type | Recommended Dosage | Application Conditions |
| Wool | 0.05-0.35% (o.w.f) | pH 3-5, 60-80°C, 20-30 minutes |
| Natural Silk | 0.05-0.4% (o.w.f) | pH 4-6, 60-70°C, 20-30 minutes |
| Nylon (Polyamide) | 0.05-0.3% (o.w.f) | pH 4-6, 70-90°C, 20-30 minutes |
| Acrylic Fibers | 0.05-0.8% (o.w.f) | pH 3-5, 80-100°C, 20-40 minutes |
| Acetate/Triacetate | 0.05-0.4% (o.w.f) | pH 4-6, 60-80°C |
Plastics Industry:
SWN is widely used for whitening PVC and other plastic materials :
| Application Type | Recommended Dosage | Processing Notes |
| H-PVC (Hard PVC) | 0.03-0.1% (300-1000 g per 1000 kg) | Predissolve in ethanol before mixing |
| S-PVC (Soft PVC) | 0.02-0.08% (200-800 g per 1000 kg) | Uniform mixing with resin |
| Plastic Canvas / Tarpaulins | 0.01-0.06% (100-600 g per 1000 kg) | Excellent whitening effect on PVC materials |
Detergent Industry:
SWN can be incorporated into laundry detergent formulations :
| Application Type | Recommended Dosage | Performance Notes |
| Laundry Powders | 0.001-0.005% (10-50 g per 1000 kg) | Improves post-wash fabric whiteness |
| Detergent Formulations | 0.01-0.05% (100-500 g per 1000 kg) | Compatible with various surfactant systems |
Coatings & Paints:
SWN is suitable for press paints, varnishes, and coatings, providing excellent whitening effects in solvent-based systems with good compatibility with acetate, polyester, polyamide, and cellulose substrates .
Paper Industry:
The brightener can be applied in paper coating formulations to enhance brightness and whiteness of specialty papers .
4.Storage
This product may be stored up to two years in a sealed container. Containers should be kept tightly closed when not in use and stored in a cool, dry place.
5.Packaging
Usually is 25Kg/drum or paper box or bag with inner double PE liner Or provide customized packaging according to customer requirements.
6.Our advantage
1) Provide free samples for testing or comparing the effect difference and cost performance.
2) Fast response speed, customers' questions at any time will be responded to in two hours.
3) Fast delivery: the fastest delivery can be made on the same day.
4)Different packaging solutions: provide various packaging options according to customer requirements.
5)Technical guidance: provide improved whitening and coloring formulas and guidance according to customer production materials.
6) Sample retention or sample mailing before bulk delivery.
7) Providing certificationes, such as Reach certification.
8) Different payment methods: TT LC, etc.
9) Providing door-to-door DDP service.
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