2379-75-1

Basic information

• Product Name: Vat Voilet 3
• Synonyms: Vat Voilet 3;5-chloro-2-(5-chloro-4,7-dimethyl-3-oxobenzo[b]thien-2(3h)-ylidene)-4,7-dimethylbenzo[b]thiophene-3(2h)-one;c.i. pigment violet 38;C.I. 73395;5,5-dichloro-4,4,7,7-tetramethyl-[2,2-bibenzo[b]thiophene]-3,3-dione;C.I. Vat Violet 3;Pigment Violet 38 (C.I.);Vat Violet 3 (C.I.)
• CAS NO: 2379-75-1
• Molecular Formula: C₂₀H₁₄Cl₂O₂S₂
• Molecular Weight: 421.35996
• EINECS: 219-164-1
• Product Categories: Organics
• Mol File: 2379-75-1.mol
• Article Data: 0

Chemical Properties

• Boiling Point: 551.8 °C at 760 mmHg
• Flash Point: 287.5 °C
• Appearance: /
• Density: 1.499
• Vapor Pressure: 3.19E-12mmHg at 25°C
• Refractive Index: 1.719
• Storage Temp.: 2-8°C
• CAS DataBase Reference: Vat Voilet 3(CAS DataBase Reference)
• NIST Chemistry Reference: Vat Voilet 3(2379-75-1)
• EPA Substance Registry System: Vat Voilet 3(2379-75-1)

Safety Data

• Hazardous Substances Data: 2379-75-1(Hazardous Substances Data)

Usage

Description

Vat Violet 3 is a brilliant red light purple powder that is insoluble in water, ethanol, and general organic solvents. It exhibits light embrittlement phenomenon and changes color in concentrated sulfuric acid to SAP green, turning pale red light purple upon dilution. Alkaline reduction leuco results in a yellow color, while acid reduction leuco renders it colorless.

Uses

Used in Textile Industry:
Vat Violet 3 is used as a dye for cotton yarn dyeing indigo with bromine and other applications. It is also utilized in the production of Tile Black Vat Brown RRD, providing excellent rubbing fastness. Additionally, it is employed for direct printing of cotton fabrics, resist printing, and discharge printing.
Standard:
Vat Violet 3 meets various industry standards for different applications, including:
Ironing Fastness: ISO 4, AATCC 5
Chlorine bleach: ISO 5, AATCC 5
Light Fastness: ISO 5, AATCC 5
Mercerized: ISO 3, AATCC 3-4
Oxygen bleach: ISO 4, AATCC 4
Soaping: ISO 4-5, AATCC 4
Fading: ISO 5, AATCC 5
Stain: Not specified
These standards ensure the quality and performance of Vat Violet 3 in various textile applications.

Preparation

2,5-Dimethyl-4-chlorophenylmercaptoacetic acid with Chlorosulfonic acid cyclization, oxidation. This intermediate is chlorinated using the sulfonyl chloride route xylene (BIOS) derived.

Standard

Ironing Fastness

Fading

Stain

ISO

4

AATCC

5

InChI:InChI=1/C20H14Cl2O2S2/c1-7-5-11(21)9(3)13-15(23)19(25-17(7)13)20-16(24)14-10(4)12(22)6-8(2)18(14)26-20/h5-6H,1-4H3/b20-19-