High Core-Load Polyacrylate Delivery Particles With Low Leakage
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Solution Overview
Problem
Existing delivery particles with high core:wall weight ratios, particularly those containing aldehyde or ketone moieties in the core, suffer from leakage and brittleness issues, leading to premature rupture and inefficient delivery of benefit agents.
Innovation Solution
The use of a specific amount of free radical initiator in the polymer wall, combined with a high core:wall weight ratio, to form polyacrylate-based delivery particles that balance leakage and fracture strength, ensuring improved delivery efficiency and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the core:wall weight ratio is increased to improve loading capacity, then the loading capacity is improved, but the particles become more brittle and prone to premature rupture
Solution Approach 1:
The patent applies parameter changes by optimizing the free radical initiator concentration (15-60% by weight of polymer wall) and using specific multifunctional crosslinking agents to modify the polymer wall properties. This allows achieving high core:wall ratios (95:5 to 99.5:0.5) while maintaining adequate fracture strength through controlled polymerization parameters rather than simply increasing wall thickness.
Solution Approach 2:
The patent uses composite materials by incorporating multifunctional crosslinking agents (with 3-6 radical polymerizable groups) into the polymer wall matrix. This creates a crosslinked composite structure that enhances mechanical strength and brittleness resistance while maintaining the high core loading capacity, effectively combining the benefits of high loading with improved structural integrity.
2Quantity of substance
If the core:wall weight ratio is increased to improve loading capacity, then the loading capacity is improved, but the leakage rate increases
Solution Approach 1:
The patent controls polymerization parameters including initiator concentration (15-60% by weight of polymer wall) and reaction conditions to form a polymer wall with optimized molecular structure. This parameter optimization enables high core:wall ratios while maintaining low leakage rates by controlling polymer chain density and wall morphology during the polymerization process.
Solution Approach 2:
The incorporation of multifunctional crosslinking agents creates a crosslinked composite network in the polymer wall that reduces molecular chain mobility and enhances barrier properties. This crosslinked composite structure effectively prevents benefit agent leakage even at high core:wall ratios where the wall material is minimized.
3Productivity
If the free radical initiator level is increased to improve polymer wall formation, then the polymerization efficiency is improved, but the brittleness increases
Solution Approach 1:
The patent optimizes the free radical initiator concentration within a specific range (15-60% by weight of polymer wall) rather than using excessive amounts. This parameter optimization achieves sufficient polymerization efficiency while avoiding the formation of overly crosslinked or dense polymer structures that would increase brittleness and reduce fracture strength.
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 selected initiator level in the polymer wall enhances the performance of delivery particles by reducing leakage and increasing fracture strength, resulting in improved olfactory performance and stability, especially when the core contains aldehyde or ketone moieties.
Implementation Method 1
the polymer wall includes a (meth)acrylate polymer derived, at least in part, from wall monomers and at least one free radical initiator
Data Source
AI summary
A consumer product composition that includes a population of delivery particles, where the delivery particles include a core and a polymer wall surrounding the core, the polymer wall being derived from (meth)acrylate monomers and at least one free radical initiator, and the core including a benefit agent such as perfume, where the core and the polymer wall are present in a weight ratio of from about 95:5 to about 99.5:0.5, and where the initiator is typically used at a certain level. Related methods of making and using such consumer product compositions.