Suncare Formulation Using Polymer Blend for Water Resistance
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Solution Overview
Problem
Existing sunscreen formulations often require high levels of UV absorbing agents to achieve effective SPF protection, which can lead to adverse toxicological and sensory effects, and they may not provide adequate water resistance and retention of suncare active ingredients.
Innovation Solution
A suncare formulation incorporating a polymer blend composed of a single stage polymer and a silicone-grafted vinyl copolymer, which enhances SPF protection, provides water resistance, and retains suncare active ingredients effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of UV absorbing agents are used to achieve effective SPF protection, then SPF protection is improved, but adverse toxicological and sensory effects worsen
Solution Approach 1:
The patent introduces polymer blends as intermediary substances that modify the behavior and distribution of UV absorbing agents on the skin. These polymers act as mediators between the UV filters and the skin surface, improving retention and reducing the need for high concentrations of potentially harmful UV absorbing agents while maintaining effective SPF protection
Solution Approach 2:
The patent employs composite material systems consisting of polymer blends combined with UV absorbing agents. This composite approach allows the formulation to achieve effective SPF protection through synergistic interactions, reducing the reliance on high levels of individual UV absorbing agents and thereby minimizing adverse toxicological and sensory effects
2Reliability
If conventional sunscreen formulations are used, then SPF protection is provided, but water resistance and retention of suncare active ingredients are insufficient
Solution Approach 1:
The patent utilizes composite material formulations combining specific polymer blends with suncare active ingredients. This composite structure enhances the overall stability of the formulation, improving water resistance and retention properties while maintaining effective SPF protection throughout the product's usage period
Solution Approach 2:
The patent modifies key formulation parameters by selecting specific polymer types and concentrations that enhance water resistance and ingredient retention. By changing the physical and chemical parameters of the base formulation through polymer selection, the patent achieves improved stability without compromising SPF protection
Data Source
AI summary
A polymer blend is provided comprising: a single stage polymer and a silicone-grafted vinyl copolymer; wherein the single stage polymer comprises: structural units of a monoethylenically unsaturated non-ionic monomer; structural units of a monoethylenically unsaturated carboxylic acid monomer; and structural units of a multiethylenically unsaturated monomer having at least two ethylenically unsaturated groups per molecule; and wherein the silicone-grafted vinyl copolymer, comprises: structural units of a vinyl monomer; and structural units of a carbosiloxane dendrimer of formula (I). Also provided is a suncare formulation comprising the polymer blend in a dermatologically acceptable carrier with a suncare active.