2,2’-4,4’-tetrahydroxy benzophenone (BP-2)

Applications

2,2',4,4'-Tetrahydroxybenzophenone (BP-2) is a highly effective UV absorber and photostabilizer known for its broad-spectrum UV absorption capabilities, particularly in the UVA and UVB ranges.2 It is widely used in industries requiring robust protection against ultraviolet radiation.

Key applications include:

1. UV Absorber/Stabilizer for Polymers and Plastics

This is its most significant application. BP-2 is incorporated into a wide variety of polymers and plastic materials to prevent their degradation, discoloration, embrittlement, and loss of mechanical properties due to UV exposure. It is particularly effective in:

Polyolefins (PE, PP): Used in films, fibers, and molded articles for outdoor use.

PVC: Stabilizes PVC products like window profiles, siding, and cables.

Polyesters, Polycarbonates, Polyurethanes: Enhances their weatherability and extends their lifespan.

Adhesives and Sealants: Improves the durability of outdoor adhesive and sealant formulations.

Coatings and Paints: Protects the underlying substrate and the coating itself from UV-induced damage, fading, and chalking, especially in clear coats and automotive finishes.

2. Photoinitiator

In certain UV-curable systems, BP-2 can also function as a photoinitiator, generating free radicals upon UV light exposure to initiate the polymerization process. This is common in UV-curable inks, coatings, and adhesives for rapid curing.

3. Cosmetics and Personal Care Products (Limited/Historical)

While other benzophenones are more common, BP-2 has been used in some cosmetic formulations as a UV filter or to protect the product itself from photodegradation. Its use as a direct sunscreen agent on skin is less prevalent compared to other, more specific UV filters.

4. Textiles

Can be applied to fabrics to provide UV protection, preventing fading of dyes and degradation of fibers, thus enhancing the durability of outdoor textiles and clothing.

5. Food Packaging

In some specific cases, it can be used in packaging materials to protect the contents from UV light degradation, although strict regulations apply here.

6. Research & Development

Used as a standard in UV spectroscopy and in research related to photostability and polymer science.

BP-2 is valued for its broad UV absorption spectrum and its ability to dissipate UV energy as thermal energy, effectively protecting materials from photodegradation.

2,2’-4,4’-tetrahydroxy benzophenone (BP-2)