How Light-Activated Polymers Deliver Skin Care Ingredients

A chemical structure that holds onto skin-care ingredients like fragrances or cooling agents and releases them only when triggered by specific light conditions.

What it covers

This patent describes a specialized polymer designed to act as a delivery vehicle for skin care products. The polymer contains a photoresponsive substance, specifically a coumarin or hydroquinone compound, which acts as a molecular switch. When this switch is exposed to certain types of light, it triggers the release of a benefit agent—such as a fragrance, cooling agent, or antimicrobial compound—that is attached to the polymer chain. This allows a cosmetic product to provide its effect only when the user is in specific lighting conditions, rather than releasing everything all at once upon application.

What it doesn't cover

• —Does not cover polymers that release their contents based on heat, pH, or moisture levels.
• —Does not cover delivery systems using non-photoresponsive triggers like mechanical friction or time-release capsules.
• —Does not cover the use of active ingredients that are not attached to this specific chemical backbone.
• —Does not cover general sunscreen formulations that do not incorporate this specific light-triggered polymer.

The clever bit

The innovation lies in using a light-sensitive molecular 'gatekeeper' (the coumarin or hydroquinone group) as a structural part of a polymer chain, allowing the polymer to physically change its state or release its cargo specifically in response to light.

Why it matters

This technology represents a shift toward smart, responsive cosmetics. By controlling when an active ingredient is released, manufacturers can ensure that fragrances or cooling sensations last longer or are only active when needed, such as when a person is outdoors in sunlight.

Real-world examples

• 1.Sun-activated cooling lotions
• 2.Fragrance-releasing skin creams for outdoor use
• 3.Antimicrobial skin treatments activated by UV exposure