Linear UV-Absorbing Polyether Sunscreen for Mild Broad-Spectrum Protection

The patent employs a composite sunscreen formulation combining multiple UV-filtering compounds (polymer-containing UV filters, non-polymer UV filters, and physical UV blockers like zinc oxide and titanium dioxide) to achieve synergistic protection. This composite approach allows the composition to provide strong UV protection while maintaining mildness through the balanced interaction of different filter types with complementary mechanisms.

The patent specifies optimized concentration ranges for each component: polymer-containing UV filters (5-30%), non-polymer UV filters (5-30%), and physical UV blockers (1-10%). By carefully controlling these parameters, the formulation achieves high SPF and PFA values while preserving skin compatibility and aesthetic properties through quantitative optimization rather than qualitative compromise.

The patent divides the UV protection function into three distinct segments: polymer-containing UV filters (for sustained release and skin compatibility), non-polymer UV filters (for immediate broad-spectrum absorption), and physical UV blockers (for reflection and scattering). Each segment targets specific UV wavelengths and mechanisms, allowing complex broad-spectrum protection to be achieved through organized functional division rather than random mixing.

The formulation uses multi-functional ingredient systems where components serve multiple roles: polymer-containing UV filters provide both UV absorption and skin-conditioning properties, emulsifiers simultaneously stabilize the formulation and enhance ingredient penetration, and preservatives protect against microbial contamination while maintaining pH balance. This multi-functionality reduces the number of separate additives needed, simplifying the overall formulation despite its broad-spectrum capabilities.