Description

2,2'-Dihydroxy-4,4'-Dimethoxybenzophenone-5,5'-Disulfonic Acid is a high-purity, multi-functional organic compound belonging to the benzophenone sulfonic acid class. It serves as a critical intermediate and functional additive valued for its UV-absorbing properties and water solubility conferred by the sulfonic acid groups. This product is essential for manufacturers in the personal care, polymer, and specialty chemical industries seeking to enhance product stability and performance. Its specific structure makes it suitable for advanced formulations requiring compatibility with aqueous systems.

Application

• UV Absorber in Sunscreens and Cosmetics: Acts as an effective water-soluble UV filter in sun care lotions, creams, and daily wear cosmetic formulations.
• Polymer Stabilizer: Incorporated into coatings, adhesives, and plastic films to prevent photodegradation and yellowing caused by ultraviolet light exposure.
• Textile Finishing Agent: Used to impart UV protection to fabrics and fibers, enhancing the durability and lifespan of technical textiles and outdoor apparel.
• Intermediate for Synthesis: Serves as a key building block for the production of more complex light stabilizers, dyes, and pharmaceutical compounds.
• Hair Care Products: Formulated into shampoos, conditioners, and styling products to protect hair from color fading and protein damage due to sun exposure.
• Industrial Coating Additive: Enhances the weatherability and gloss retention of water-based industrial and automotive coatings.

Basic Information

Product Name	2,2'-Dihydroxy-4,4'-Dimethoxybenzophenone-5,5'-Disulfonic Acid
CAS No.	143982-77-8
Molecular Formula	C16H16O12S2
Molecular Weight	464.42 g/mol
Synonyms	Benzophenone-9; 5,5'-Sulfonylbis(2-hydroxy-4-methoxybenzoic acid); Disodium 2,2'-dihydroxy-4,4'-dimethoxybenzophenone-5,5'-disulfonate; UV Absorber BP-9; Uvinul DS49; 2-Hydroxy-4-methoxy-5-sulfobenzophenone (dimer); Bis(5-carboxy-2-hydroxy-4-methoxyphenyl) sulfone; Light stabilizer 143982-77-8
EINECS	Contact for details

Quality Control

Our production of 2,2'-Dihydroxy-4,4'-Dimethoxybenzophenone-5,5'-Disulfonic Acid adheres to stringent quality management protocols to ensure batch-to-batch consistency and reliability. Each lot is analyzed against comprehensive specifications using advanced techniques like HPLC and FTIR. A Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment. We support compliance with global regulatory frameworks, including REACH, and can tailor quality standards to meet specific customer or pharmacopeial requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). This material is light-sensitive (store away from light) and hygroscopic (moisture-sensitive). Keep away from strong oxidizing agents and strong bases. For long-term storage, consider using desiccants to maintain dryness.

Specification

Item	Specification
Appearance	Light yellow to off-white powder
Identification (IR)	Conforms to reference spectrum
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm
pH (1% Solution)	2.5 - 4.5
UV Absorbance (λ max)	Conforms

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