Hydroxypropyl Bis(N-Hydroxyethyl-P-Phenylenediamine) Hcl

Product Description

Hydroxypropyl Bis(N-Hydroxyethyl-P-Phenylenediamine) HCl is a sophisticated, high-molecular-weight primary intermediate used in the formulation of permanent oxidative hair colors. Unlike traditional p-phenylenediamines, its unique dimeric structure and hydroxyethyl substitutions significantly reduce its ability to penetrate the skin, offering a much lower sensitization profile while maintaining exceptional coloring power. It is commercially favored for creating deep, rich blue and violet tones when coupled with resorcinol or naphthols. This premium ingredient is essential for B2B manufacturers aiming to produce "high-safety" or "sensitive-skin friendly" professional salon hair color ranges without compromising on pigment intensity or durability.

Product Specification

• INCI Name: Hydroxypropyl Bis(N-Hydroxyethyl-P-Phenylenediamine) HCl
• CAS No.: 128723-93-1
• Commercial Name: Colorex HPB
• Product Type: Hair Dye Primary Intermediate
• Appearance: Off-white to light pink or greyish crystalline powder
• Purity (HPLC): ≥ 98.0%
• Melting Point: 220.0°C - 230.0°C
• Loss on Drying: ≤ 1.0%

Key Benefits & Applications

• Advanced Safety Profile: Its large molecular size and low skin permeability make it a safer alternative to PPD and PTD, reducing the risk of allergic contact dermatitis.
• Exceptional Color Vibrancy: Delivers intense, multi-dimensional cool-toned pigments that exhibit superior resistance to shampooing and UV-induced fading.
• Uniform Dyeing: Provides excellent leveling properties, ensuring consistent color results from the root to the porous ends of the hair fiber.
• Non-Staining: Specifically designed to have a low affinity for the skin/scalp while maintaining a high affinity for keratin fibers, resulting in cleaner application results.
• Applications: Premium permanent hair color creams, professional demi-permanent toners, and scalp-comfort focused hair dye systems.

Formulation Guidelines

• Suggested Dosage: 0.1% – 3.0%, depending on the desired color depth and target shade.
• Oxidative Conditions: Requires activation with an oxidizing agent (typically Hydrogen Peroxide) in an alkaline environment (pH 9.0 – 11.0) to develop the full pigment intensity.
• Processing: Highly stable during the emulsification process. It is recommended to dissolve it in the water phase or pre-blend with glycols. Protect the bulk from premature oxidation during storage and manufacturing.
• Packaging: Store in a cool, dry, and light-proof container. Use nitrogen blanketing for opened containers to prevent oxidative darkening of the powder.
• Synergy: Combine with Bisabolol to minimize potential scalp sensitivity during the oxidation process, creating a "comfort-first" professional hair color experience for users with reactive skin.