Description

4,4'-Diamino-5,5'-Dimethyl-2,2'-Biphenyl Disulfonic Acid Disodium Salt is a high-purity, water-soluble aromatic disulfonate salt. This compound serves as a critical key intermediate in the synthesis of advanced colorants and functional polymers. It is primarily required by manufacturers in the dyes and pigments, specialty chemicals, and pharmaceutical intermediates sectors for producing high-performance materials.

Application

• Dye and Pigment Intermediate: A crucial building block for synthesizing high-grade, water-soluble azo dyes, acid dyes, and reactive dyes.
• Optical Brightener Production: Used in the manufacture of stilbene-based optical brightening agents (OBAs) for paper, textiles, and detergents.
• Pharmaceutical Synthesis: Serves as a key intermediate for creating specific active pharmaceutical ingredients (APIs) and diagnostic agents.
• Polymer Modification: Incorporated into polymer chains to introduce sulfonate groups, enhancing water solubility and ionic character.
• Liquid Crystal Materials: Used in the research and development of specialty chemicals for electronic displays.
• Corrosion Inhibitor Formulation: Acts as a component in advanced formulations for industrial water treatment.
• Analytical Reagent: Employed as a standard or reagent in chemical analysis and research laboratories.
• Cross-linking Agent: Potential use in creating cross-linked polymeric networks for specialized applications.

Basic Information

Product Name	4,4'-Diamino-5,5'-Dimethyl-2,2'-Biphenyl Disulfonic Acid Disodium Salt
CAS No.	67027-35-4
Molecular Formula	C16H18N2Na2O6S2
Molecular Weight	452.42 g/mol
Synonyms	2,2'-Biphenyldisulfonic acid, 4,4'-diamino-5,5'-dimethyl-, disodium salt; 4,4'-Diamino-5,5'-dimethyl-[1,1'-biphenyl]-2,2'-disulfonic acid disodium salt; 5,5'-Dimethylbenzidine-2,2'-disulfonic acid disodium salt; DSD Acid Disodium Salt; Disodium 4,4'-diamino-5,5'-dimethylbiphenyl-2,2'-disulfonate; 4,4'-Diamino-5,5'-dimethyl-2,2'-stilbenedisulfonic acid disodium salt (related); Direct Black 22 intermediate; Contact for EINECS details.

Quality Control

Our production of 4,4'-Diamino-5,5'-Dimethyl-2,2'-Biphenyl Disulfonic Acid Disodium Salt adheres to stringent ISO 9001 quality management principles. Every batch undergoes comprehensive analytical testing including HPLC, IR, and titration to ensure high chemical purity and consistent performance. Certificates of Analysis (COA) detailing purity, identity, and impurity profiles are available upon request to 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 a controlled room temperature (15-25°C). Due to its hygroscopic nature, the container must be kept sealed to prevent moisture absorption, which can affect product quality and handling.

Specification

Item	Specification
Appearance	Off-white to light yellow crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Heavy Metals (as Pb)	≤ 20 ppm
Residue on Ignition	≤ 0.5%
Solubility (in Water)	Clear, complete solution

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