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| Catalog Number | CI-OT-0070 |
| Product Name | Benzophenone-4 |
| CAS | 4065-45-6 |
| Structure |  |
| Synonyms | 2-Hydroxy-4-methoxybenzophenone-5-sulfonic acid |
| IUPAC Name | 5-benzoyl-4-hydroxy-2-methoxybenzenesulfonic acid |
| Molecular Weight | 308.31 g/mol |
| Molecular Formula | C14H12O6S |
| InChI | InChI=1S/C14H12O6S/c1-20-12-8-11(15)10(7-13(12)21(17,18)19)14(16)9-5-3-2-4-6-9/h2-8,15H,1H3,(H,17,18,19) |
| InChI Key | CXVGEDCSTKKODG-UHFFFAOYSA-N |
| Melting Point | 170 °C |
| Purity | 0.98 |
| Density | 1.46 g/mL |
| Appearance | White to off-white solid |
| Isomeric SMILES | COC1=C(C=C(C(=C1)O)C(=O)C2=CC=CC=C2)S(=O)(=O)O |
Benzophenone-4 is primarily used as a UV filter within sunscreen formulations, appearing as a white to pale yellow powder. Its structure includes a sulfonic acid group, which imparts high solubility in water, propylene glycol, glycerin, and both ethyl and isopropyl alcohols. When used in combination with oil-soluble UV filters such as Benzophenone-3, it offers substantial sun protection by shielding skin from UV radiation's harmful effects. Beyond sun care, Benzophenone-4 is also incorporated into hair care products to safeguard against UV-induced brittleness and damage, particularly in bleached hair. Additionally, it helps preserve other ingredients from UV degradation, prevents color fading in formulations housed in transparent packaging, and stabilizes the viscosity of gels based on polyacrylic acid. The acidic nature of Benzophenone-4 requires it to be neutralized using agents like triethanolamine or sodium hydroxide, although this process may alter its UV absorption efficacy and color intensity.
What is Benzophenone-4 and in what form is it typically found?
Benzophenone-4 is a white to pale yellow powder commonly used as a UV filter in sunscreen applications. It is recognized for its water solubility and is readily soluble in a variety of substances, including water, propylene glycol, glycerin, ethyl, and isopropyl alcohols.
How does Benzophenone-4 function in sunscreen products?
In sunscreen products, Benzophenone-4 acts as a UV filter. When combined with other oil-soluble UV filters like Benzophenone-3, it enhances the sun protection factor (SPF) and safeguards the skin against harmful UV radiation.
Aside from sunscreen, what are other applications of Benzophenone-4?
Beyond sun care, Benzophenone-4 is widely used in hair protection products. It helps to prevent the brittleness of hair and protects bleached hair from UV radiation. It also plays a role in preserving other ingredients from UV-induced degradation and preventing color fading in formulations packaged in transparent containers.
How does Benzophenone-4 contribute to the stability of cosmetic formulations?
Benzophenone-4 contributes to the stability of cosmetic formulations by stabilizing the viscosity of gels that use polyacrylic acid and enhancing the stability of fragrance oils. This makes it a versatile ingredient in a range of cosmetic applications.
Is there any special consideration needed when formulating with Benzophenone-4?
Yes, due to its acidic nature from the presence of the sulfonic acid group, Benzophenone-4 must be neutralized using neutralizing agents like triethanolamine or sodium hydroxide. It is important to note that this neutralization process can alter the UV-absorption ability and color intensity of Benzophenone-4.
Why is Benzophenone-4 considered effective in protecting hair care products?
Benzophenone-4 is effective in hair care products because it helps prevent hair brittleness and protects bleached hair from the harmful effects of UV radiation. It ensures both the integrity and appearance of hair are maintained even when exposed to the sun.
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