Agar Shell Capsule Stability in Liquid Cosmetic Formulations
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Solution Overview
Problem
Conventional capsule-containing aqueous cosmetics become turbid over time due to capsule damage and leakage, leading to impaired appearance and reduced moisturizing effects, with low molecular polyols exacerbating the issue by extracting oil components from capsules.
Innovation Solution
A liquid cosmetic with agar shell capsules in an aqueous medium containing a low molecular polyol and at least one polymer, such as an alkyl (meth)acrylic copolymer or polysaccharide, which reduces capsule damage and leakage, maintaining transparency and skin moisturizing effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional capsules are used in aqueous cosmetic, then the cosmetic can provide moisturizing effect, but the capsules become damaged and leak over time causing turbidity
Solution Approach 1:
The patent replaces conventional capsule shells with agar-based shells that have flexible yet stable properties. The agar shell maintains structural integrity over time while allowing the cosmetic components to remain encapsulated, preventing leakage and turbidity formation.
Solution Approach 2:
The patent uses composite material formulation by combining agar with specific polymers (alkyl (meth)acrylic copolymer and/or polysaccharide) to create a capsule shell that exhibits both mechanical stability and resistance to degradation in aqueous environment, thereby preventing capsule damage and subsequent turbidity.
2Quantity of substance
If low molecular polyol is added to aqueous medium, then moisturizing effect is enhanced, but oil components are extracted from capsules causing turbidity
Solution Approach 1:
The agar shell acts as an intermediary barrier between the low molecular polyol in the aqueous medium and the oil components inside the capsules. This barrier prevents the polyol from extracting oil components while still allowing the moisturizing effect to be achieved through the capsule formulation.
Solution Approach 2:
The patent changes the physical-chemical parameters of the capsule shell by using agar with specific gel strength and molecular structure, which alters the shell's permeability characteristics to resist extraction by low molecular polyol while maintaining moisture retention.
3Illumination intensity
If colorant is added to capsules, then aesthetic quality is enhanced, but colorant leaks with capsule contents making instability conspicuous
Solution Approach 1:
The agar-based capsule shell provides a stable containment structure that prevents colorant leakage while maintaining the aesthetic appearance. The shell's structural integrity ensures that colorant remains encapsulated, preventing the instability that would otherwise become conspicuous.
4Illumination intensity
If capsules have different specific gravity from aqueous medium, then aesthetic quality is improved with separated layers, but capsules separate from medium requiring shaking
Solution Approach 1:
The patent adjusts the specific gravity of the aqueous medium by modifying its composition (adding polymers, adjusting concentration) to match or closely approximate the specific gravity of the agar capsules. This parameter adjustment allows the capsules to remain suspended in the medium without separation, eliminating the need for shaking while maintaining aesthetic quality.
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 solution significantly reduces turbidity and maintains the cosmetic's original moisturizing effect over extended periods, ensuring the oil components remain encapsulated and the cosmetic's aesthetic quality is preserved.
Implementation Method 1
the capsule comprises agar shell encapsulating an oil component
Implementation Method 2
the low molecular polyol capable of functioning as the humectant, thus increasing and also helping to prolong the skin-moisturizing effect
Implementation Method 3
the moisture-retaining property of the agar itself functions together with the low molecular polyol
Implementation Method 4
the aqueous medium comprises a low molecular polyol and at least one polymer selected from the group consisting of an alkyl (meth)acrylic copolymer and a polysaccharide
Data Source
AI summary
The invention provides a liquid cosmetic that contains capsule in an aqueous medium, wherein the capsule comprises agar shell encapsulating an oil component, and the aqueous medium comprises a low molecular polyol and one selected from the group consisting of a (meth)acrylic polymer and a polysaccharide.