Silicone Polyurethane Elastomer Cosmetic Film Transfer Resistance
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Solution Overview
Problem
Current cosmetic compositions lack improved transfer resistance and long-wear properties for skin and hair, despite advancements in film-forming methods and compositions.
Innovation Solution
The use of a combination of silicone polyurethane polymer and elastomer, such as silicone gums, polyisobutylene, natural rubbers, and block-copolymer rubbers, in specific weight ratios to create a durable, transfer-resistant film on skin or hair, enhancing water and oil transfer resistance, flexibility, and viscoelastic properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organosiloxane film formers are used to improve spreading properties and adhesion, then film-forming properties are improved, but transfer resistance and long-wear properties remain insufficient
Solution Approach 1:
The patent combines silicone polyurethane polymer with elastomers (such as polyisobutylene, natural rubbers, or block-copolymer rubbers) to create a composite film-forming system. This composite approach integrates the adhesion benefits of organosiloxanes with the flexibility and durability of elastomers, achieving both improved transfer resistance and extended wear duration that neither material could accomplish alone.
Solution Approach 2:
The patent specifies precise weight ratios of silicone polyurethane polymer to elastomer (from about 50:1 to about 1:50, with preferred ranges of 10:1 to 1:10 and most preferably 5:1 to 1:5). By optimizing these compositional parameters, the formulation achieves the desired balance between transfer resistance and wear duration.
2Reliability
If silicone polyurethane polymer and elastomer are combined in specific ratios, then transfer resistance is improved, but formulation complexity increases
Solution Approach 1:
The patent establishes specific weight ratio ranges (50:1 to 1:50, preferably 10:1 to 1:10, most preferably 5:1 to 1:5) for silicone polyurethane polymer to elastomer. By defining these precise parameter ranges, the patent simplifies the formulation process while achieving optimal transfer resistance, transforming a potentially complex multi-variable problem into a manageable parameter optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The synergistic combination of silicone polyurethane polymer and elastomer provides improved durability and transfer resistance, maintaining the cosmetic film on the skin or hair for an extended period, typically up to 24 hours, with enhanced substantivity and flexibility under both oily and watery conditions.
Implementation Method 1
employ various film forming agents to aid in spreading and adhering a formulation to a surface such as skin
Implementation Method 2
at least one elastomer selected from the group consisting of silicone gums, polyisobutylene, natural rubbers, and block-copolymer rubbers
Implementation Method 3
enhancing water and oil transfer resistance, flexibility, and viscoelastic properties
Data Source
AI summary
Cosmetic compositions and methods with improved transfer resistance and long wear properties are disclosed. The cosmetic compositions contain a synergistic combination of at least one silicone polyurethane polymer and at least one elastomer.