Crosslinked Silicone Resin Films for Flexible Oil-Resistant Cosmetics
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Solution Overview
Problem
Cosmetic preparations containing organosilicon resins face issues of brittleness, poor oil resistance, and stickiness, which affect their long-lasting performance and user comfort.
Innovation Solution
A crosslinked organosilicon resin is formed through an addition reaction between an alkenyl group-containing organosilicon resin and an organohydrogenpolysiloxane, controlling the ratio of hydrosilyl groups to alkenyl groups to minimize residual hydrosilyl groups and hydrogen gas generation, resulting in a flexible, oil-resistant, and non-sticky film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an MQ resin is used to form a film, then the film has suitable mechanical strength, but the film becomes brittle and cracks easily
Solution Approach 1:
The patent uses a composite material system consisting of MQ resin combined with plasticizer and crosslinking agent. This composite approach allows the film to inherit the mechanical strength from MQ resin while the plasticizer prevents brittleness and the crosslinking agent enhances flexibility, thereby resolving the contradiction between strength and brittleness.
Solution Approach 2:
The patent changes the chemical and physical parameters of the film-forming composition by introducing plasticizers (changing softness parameter) and crosslinking agents (changing network structure parameter). These parameter changes transform the film properties from brittle to flexible while maintaining mechanical strength.
2Ease of operation
If silicone-modified acrylic polymer is added to improve oil resistance, then certain softness and followability are achieved, but sufficient oil resistance cannot be achieved
Solution Approach 1:
The patent employs a composite film-forming system combining MQ resin, plasticizer, and crosslinking agent. This composite structure provides both the softness/followability needed for ease of operation and the oil resistance required to resist sebum, overcoming the limitations of single-component systems like silicone-modified acrylic polymer.
3Stability of the object's composition
If hydrosilyl group-containing organosilicon resin is crosslinked with vinyl group-containing silicone, then a cured product with high flexibility is formed, but it becomes poorly soluble in volatile oils
Solution Approach 1:
The patent optimizes the crosslinking parameters by selecting specific crosslinking agents and controlling the crosslinking degree. This allows the formation of a flexible cured product that maintains adequate solubility in volatile oils, resolving the contradiction between flexibility and solubility through precise parameter control.
4Strength
If crosslinked organosilicon resin is used to improve film toughness, then self-supporting films can be formed, but the film still has insufficient abrasion resistance
Solution Approach 1:
The patent creates a composite film system where MQ resin provides the base structure, plasticizer ensures flexibility and prevents cracking, and crosslinking agent enhances toughness. This multi-component composite achieves both self-supporting capability and improved abrasion resistance by synergistic interaction of components.
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 crosslinked resin provides a film with high flexibility, oil resistance, and suitable feel on use, preventing secondary adhesion and ensuring long-lasting performance.
Implementation Method 1
A crosslinked organosilicon resin is formed through an addition reaction between an alkenyl group-containing organosilicon resin and an organohydrogenpolysiloxane
Data Source
AI summary
The present invention provides a crosslinked organic silicon resin which is an addition reaction product of the component (A) and the component (B) described below, wherein the amount of a hydrogen gas generated from this crosslinked organic silicon resin per mass thereof is up to 1.5 mL/g in a standard state. This crosslinked organic silicon resin has excellent long-term stability and forms a coating film that exhibits excellent oil resistance and high bendability, while being free from stickiness and brittleness.Component (A): an alkenyl group-containing organic silicon resin that has one or more alkenyl groups in each moleculeComponent (B): an organohydrogen polysiloxane that has two or more hydrosilyl groups in each molecule.The present invention also provides a cosmetic preparation which comprises this crosslinked organic silicon resin and has good feeling of use and good spreadability, while having excellent secondary adhesion prevention properties.