Microcapsule compositions stabilized with viscosity control agents
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Solution Overview
Problem
Conventional microcapsule compositions face stability issues such as short storage lifetime, gel formation during transportation, and instability in consumer products due to premature release of active materials.
Innovation Solution
A microcapsule composition stabilized by a viscosity control agent with a molecular weight of 200-10,000,000, dispersed in an aqueous phase, maintaining a viscosity of less than 1.5 Pa·s, which prevents gel formation and extends shelf life by ensuring even dispersion of microcapsules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional microcapsule compositions are used, then they can deliver active materials in a controlled manner, but they form gel and separate into layers during storage and transportation
Solution Approach 1:
A viscosity control agent is introduced as an intermediary substance to modify the rheological properties of the aqueous phase. This agent prevents gel formation by controlling the viscosity and flow characteristics of the composition, thereby maintaining stability without interfering with the microcapsule structure or active material release mechanism.
Solution Approach 2:
The viscosity control agent modifies the physical parameters of the composition, specifically the viscosity and flow behavior of the aqueous phase. By adjusting these rheological parameters, the composition maintains liquid flow properties during storage and transportation, preventing gel formation while preserving the controlled release functionality of the microcapsules.
2Reliability
If conventional microcapsule compositions are used, then they can encapsulate active materials, but they release active materials prematurely
Solution Approach 1:
The viscosity control agent acts as a protective intermediary in the aqueous phase, creating a stable environment that prevents premature interaction between the microcapsule wall and external factors that could trigger early release. This maintains the integrity of the encapsulation system throughout the storage period.
3Stability of the object's composition
If conventional microcapsule compositions are used, then they can be dispersed in aqueous phase, but they separate into layers during storage
Solution Approach 1:
The viscosity control agent serves as a mediating substance in the aqueous phase that prevents phase separation. By controlling the rheological properties and maintaining uniform viscosity throughout the composition, it prevents the formation of distinct layers during storage and transportation.
Solution Approach 2:
The addition of the viscosity control agent changes the rheological parameters of the aqueous phase, specifically increasing and stabilizing the viscosity. This parameter change prevents the compositional stratification and layer separation that would otherwise occur during extended storage periods.
Data Source
AI summary
Disclosed are microcapsule compositions each comprising a microcapsule suspended in an aqueous phase and a viscosity control agent, wherein the viscosity control agent is an acrylate copolymer, a cationic acrylamide copolymer, or a polysaccharide. Also disclosed are consumer products containing such a microcapsule composition.