Isononyl Isononoate,59219-71-5

I. Physical and Chemical Properties

• Appearance and Physical State: Colorless to slightly yellowish clear liquid, typically with a very faint characteristic odor or virtually odorless.

• Molecular Weight: 284.48

• Viscosity: Features extremely low viscosity and excellent fluidity, providing a refreshing and non-greasy skin feel.

• Spreadability: Exhibits a high spreading coefficient, allowing it to spread rapidly and form a uniform film across the skin or solid surfaces.

• Solubility: Practically insoluble in water; highly soluble in ethanol, ethyl ether, isopropanol, as well as various mineral oils, vegetable oils, and synthetic esters. It shows outstanding co-solubility with a wide range of lipophilic active ingredients, pigments, and silicone oils.

• Melting/Freezing Point: Has a very low freezing point (typically below $-30^\circ\text{C}$), maintaining excellent liquid fluidity at low temperatures without readily crystallizing.

II. Chemical and Industrial Applications

Thanks to its unique, fully saturated branched structure, this compound plays a vital role as a premium oil phase and functional additive in fine chemicals:

1. Cosmetics and Personal Care (Core Application)

Widely used in the cosmetics industry as a high-end emollient and solvent, it is well-known as a synthetic alternative to silk oil:

• Refreshing Skin Feel: Frequently used as an oil-phase raw material in premium skincare creams and lotions. Its ultra-low viscosity and high spreadability allow it to replace volatile cyclic silicones (such as D5), delivering an exceptionally light, silky, and non-greasy application experience.

• Pigment and Powder Dispersant: In color cosmetics (e.g., lipsticks, liquid foundations, and sunscreens), it demonstrates strong dispersing capabilities for inorganic pigments like titanium dioxide and iron oxides, as well as organic UV filters. This prevents powder agglomeration, ensuring a more even and seamless makeup application.

• Waterproofing and Radiance: Forms a breathable, hydrophobic protective barrier on the skin surface that locks in moisture while imparting an elegant gloss to finished products like lipsticks.

2. Specialty Industrial Lubricants and Additives

Leveraging its thermal stability and low-temperature fluidity in industrial chemistry:

• Synthetic Lubricant Base Oil: Used to formulate specialty lubricants and precision machinery lubricants designed for extreme high- or low-temperature environments. Its excellent shear stability and oxidation resistance significantly extend lubricant service life.

• Metalworking Fluids: Serves as a lubricant and surface protectant in high-end metal cutting, stamping, and processing fluids.

3. Plastics and Polymer Additives

• Specialty Plasticizer / Softener: Acts as an internal lubricant or plasticizer in compounding synthetic rubbers or specialty plastics requiring high thermal stability. It enhances processing performance and endows final products with superior cold resistance.

4. Chemical Solvents and Formulation Components

• Active Ingredient Carrier: Employed as a co-solvent or high-boiling carrier for poorly soluble organic compounds in sophisticated agricultural formulations, high-grade printing inks, or coatings, thereby enhancing the stability and homogeneity of the formulation system.