Polyacrylate-Shell Delivery Particles for Leakage-Resistant Odor Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Benefit agents such as perfumes and silicones in consumer products like personal care and fabric care compositions are expensive and less effective due to leakage and incompatibility issues, leading to reduced odor profiles in treated fabrics.
Innovation Solution
The development of benefit agent containing delivery particles with a polyacrylate shell that minimizes leakage by judicious selection of colloid type, molecular weight, and solvent system, along with processes to stabilize the slurry by reducing free polyvinyl alcohol and minimizing salt levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the particle's shell strength is increased to minimize benefit agent leakage, then leakage is reduced, but the wet and dry fabric odor is reduced
Solution Approach 1:
The patent applies parameter changes by systematically varying the molecular weight of polyvinyl alcohol (from 50,000 to 2,000,000), the ratio of polyvinyl alcohol to polyacrylate (from 1:4 to 4:1), and the degree of crosslinking (0-5%) to optimize the shell properties. These parameter adjustments enable the shell to maintain appropriate strength while preserving benefit agent release capability, resolving the contradiction between leakage resistance and odor profile.
Solution Approach 2:
The patent employs composite materials by combining polyvinyl alcohol with polyacrylate in specific ratios to create a shell that integrates the strength properties of polyacrylate with the film-forming and release properties of polyvinyl alcohol. This composite structure allows the shell to provide both leakage resistance and controlled benefit agent release, simultaneously addressing both requirements of the contradiction.
2Ease of manufacture
If polyvinyl alcohol is used as a colloid to manufacture delivery particles, then particle formation is achieved, but slurry stability is decreased due to free polyvinyl alcohol
Solution Approach 1:
The patent applies the extraction principle by removing free polyvinyl alcohol from the slurry through filtration or centrifugation processes after particle formation. This eliminates the source of depletion flocculation while preserving the manufactured particles, thereby resolving the contradiction between ease of manufacture and slurry stability.
Solution Approach 2:
The patent applies preliminary action by incorporating a crosslinking step during particle formation that ensures complete incorporation of polyvinyl alcohol into the shell structure before the slurry is finalized. This preliminary crosslinking prevents free polyvinyl alcohol from causing instability later, while still allowing easy particle formation.
3Productivity
If benefit agents are encapsulated to improve delivery efficiency, then delivery efficiency is improved, but manufacturing complexity increases due to multicomponent system control
Solution Approach 1:
The patent applies merging by combining the shell formation and crosslinking steps into a single integrated process. The polyvinyl alcohol and polyacrylate are co-polymerized or physically combined during the same encapsulation process, eliminating the need for separate shell formation and crosslinking steps. This reduces manufacturing complexity while maintaining the multicomponent benefits for improved delivery efficiency.
Solution Approach 2:
The patent uses crosslinking agents as intermediaries that facilitate the integration of multiple components (polyvinyl alcohol, polyacrylate, and benefit agents) into a unified shell structure. The crosslinking agent mediates between these components, creating a cohesive network that simplifies the manufacturing process while preserving the functional benefits of the multicomponent system.
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 provides enhanced perfume benefits to wet and dry fabrics by reducing leakage, maintaining odor profiles, and stabilizing the slurry for improved delivery efficiency.
Implementation Method 1
a shell encapsulating the core
Implementation Method 2
such particles leak benefit agent over time, possibly via diffusion
Implementation Method 3
the colloid type, the monomeric building block for the capsule wall, and the benefit agent solvent system because colloids and capsule shell polymers both form an integrated delivery system
Implementation Method 4
Such free polyvinyl alcohol results in a depletion flocculation of the benefit agent containing delivery particles that destabilizes the slurry
Data Source
AI summary
Benefit agent containing delivery particles that can be supplied as slurries, compositions comprising such particles, and processes for making and using such particles and compositions.