Polymer Blend UV Protection Water Resistance

The patent employs a composite polymer system combining polyacrylonitrile with copolymers containing siloxane groups and aromatic rings. This composite structure provides inherent UV absorption and scattering capabilities through the aromatic moieties and siloxane groups, eliminating the need for high levels of separate UV absorbing agents while maintaining effective SPF protection. The composite material approach integrates multiple functions (UV protection, film formation, water resistance) into a single polymer system, reducing formulation complexity.

The patent modifies polymer parameters by incorporating siloxane groups and aromatic rings into the polymer structure, changing the chemical composition and physical properties. The siloxane groups provide water resistance through their hydrophobic nature, while the aromatic rings contribute to UV absorption. This parameter change in polymer composition enables simultaneous achievement of water resistance, long wear properties, and suncare active retention without relying on conventional polymers that compromise these properties.

The patent converts the potential harm of requiring high levels of suncare actives (which cause adverse toxicological effects) into a benefit by using the polymer's inherent structural features (aromatic rings and siloxane groups) for UV protection. The polymer structure itself becomes the protective agent, absorbing and scattering UV radiation without requiring high concentrations of separate suncare actives, thus eliminating toxicological concerns while maintaining or enhancing SPF protection.

The patent creates a multi-functional polymer system where a single polymer composition provides multiple functions simultaneously: water resistance through siloxane groups, UV protection through aromatic rings, film formation, and long wear properties. This universal polymer composition eliminates the need for separate additives for each function, allowing the formulation to achieve long wear properties while maintaining water resistance and suncare active retention through the integrated design of the polymer structure.