Description

Disodium 2,2'-Dihydroxy-4,4'-Dimethoxy-5,5'-Disulfobenzophenone is a high-purity, water-soluble benzophenone derivative primarily valued for its exceptional ability to absorb ultraviolet light. This compound is critical for formulators requiring a broad-spectrum UV absorber that is compatible with aqueous systems. It is essential for manufacturers in the personal care, coatings, and polymer industries seeking to enhance product stability and longevity by protecting against UV-induced degradation.

Application

• Sunscreen & Personal Care Formulations: Acts as a key water-soluble UV filter in sunscreens, moisturizers, and after-sun products, providing broad-spectrum UVA/UVB protection.
• Industrial & Automotive Coatings: Incorporated into water-based paints, lacquers, and clear coats to prevent yellowing, cracking, and gloss loss caused by sunlight exposure.
• Polymer & Plastic Stabilization: Used as a light stabilizer in aqueous polymer dispersions, adhesives, and certain plastics to extend service life and maintain color integrity.
• Textile & Fiber Treatment: Applied in finishing baths for synthetic fibers and fabrics to impart UV resistance, preventing dye fading and fiber weakening.
• Photographic & Imaging Chemicals: Serves as a functional additive in specific light-sensitive layers and processing solutions.
• Research & Development: Utilized as a reference standard or key intermediate in the synthesis of novel UV-absorbing materials and specialty chemicals.

Basic Information

Product Name	Disodium 2,2'-Dihydroxy-4,4'-Dimethoxy-5,5'-Disulfobenzophenone
CAS No.	76656-36-5
Molecular Formula	C15H12Na2O11S2
Molecular Weight	478.35 g/mol
Synonyms	Benzophenone-9; Disodium 2,2'-Dihydroxy-4,4'-Dimethoxybenzophenone-5,5'-Disulfonate; Uvinul® DS49; 2,2'-Dihydroxy-4,4'-dimethoxy-5,5'-disulfobenzophenone Disodium Salt; 5,5'-Disulfo-2,2'-dihydroxy-4,4'-dimethoxybenzophenone Disodium Salt; Disulfobenzophenone-9; UV Absorber 9
EINECS	Contact for details

Quality Control

Our Disodium 2,2'-Dihydroxy-4,4'-Dimethoxy-5,5'-Disulfobenzophenone is manufactured under a strict quality management system. Every batch is subjected to rigorous analytical testing to ensure it meets precise specifications for identity, purity, and performance. A comprehensive Certificate of Analysis (COA) documenting assay, impurity profile, and physical properties is provided with each shipment to guarantee consistency and support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept tightly sealed to minimize exposure to atmospheric moisture. Keep away from incompatible materials.

Specification

Item	Specification
Appearance	Yellow to light brown powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
UV Absorption (λ max)	Conforms
Water Content (KF)	≤ 5.0%
Residue on Ignition	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	6.0 - 8.0

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.