Compact Powder Using Crosslinked Polyelectrolyte Polymer
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Solution Overview
Problem
Existing cosmetic compact powders face challenges in achieving high impact resistance, easy application, and uniform spread while maintaining a smooth surface, often requiring large amounts of binding agents that can make the surface greasy and difficult to apply, and existing industrial processes are energy-intensive and complex.
Innovation Solution
A powder composition comprising 84.3% to 95.8% bulking agent, 4% to 15% colored pigment, and 0.2% to 0.7% crosslinked anionic polyelectrolyte type polymer, with specific monomeric units and crosslinking agents, which is processed to create a compact powder with improved cohesion and transfer quality, using a method that does not require significant energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large quantities of binding agents are used to improve impact resistance, then the compact powder becomes more resistant to impacts, but the surface becomes greasy and transfer to finger or applicator becomes less effective
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific crosslinked anionic polyelectrolyte polymer with defined monomeric units (ATBS, HEA, SMA, LAUMA) and crosslinking agent (TMPTA). This polymer provides binding functionality with different chemical properties than traditional silicone-based binders, achieving impact resistance without excessive surface greasiness and maintaining good transfer properties.
2Stability of the object's composition
If traditional binding agent mixtures are used to achieve compact formation, then the compact powder gains cohesion, but the surface appearance becomes greasy and uniform spread is compromised
Solution Approach 1:
The patent creates a composite material system combining the crosslinked anionic polyelectrolyte polymer with specific filler particles (silica, talc, mica) and pigments. This composite approach allows the polymer to provide internal cohesion while the filler particles contribute to surface smoothness and uniform appearance, resolving the contradiction between compact strength and surface quality.
3Reliability
If existing industrial processes are used to prepare compact powders, then the product achieves required properties, but significant energy consumption is required
Solution Approach 1:
The crosslinked anionic polyelectrolyte polymer possesses inherent binding and cohesive properties that enable compact formation without requiring additional energy-intensive processing steps. The polymer's molecular structure provides self-binding capability, eliminating or reducing the need for high-energy manufacturing processes while maintaining product quality.
4Stability of the object's composition
If conventional polymer binders are used in compact powder formulation, then the compact maintains structural integrity, but impact resistance is insufficient
Solution Approach 1:
The patent modifies the binder parameters by using a crosslinked polyelectrolyte structure with specific monomeric composition (65-95 mol% ATBS, 4.8-25 mol% HEA, 0.1-5 mol% SMA, 0.1-5 mol% LAUMA) and crosslinking density (0.1-5 mol% TMPTA). This specific parameter range optimizes both structural integrity and impact resistance, overcoming the limitations of conventional polymer binders.
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 a compact powder with enhanced impact resistance, easy application, and uniform spread, maintaining a smooth surface without greasiness, and can be produced using a more energy-efficient and scalable process.
Implementation Method 1
at least one crosslinked anionic polyelectrolyte type polymer
Implementation Method 2
crosslinked anionic polyelectrolyte type polymer comprising for 100 molar %: from 65 molar % to 95 molar % of monomeric units derived from partially or totally salified 2-methyl 2-[(1-oxo 2-propenyl) amino] 1-propanesulfonic acid
Implementation Method 3
at least one binding agent
Data Source
AI summary
Pulverulent composition (Ci) in the form of a powder comprising, for 100% of the weight thereof: i) from 89.5% to 94.65% by weight of at least one filler (AC); ii) from 5% to 10% by weight of at least one coloured pigment (PC); iii) from 0.35% to 0.5% by weight of at least one polymer of crosslinked anionic polyelectrolyte type (P) which comprises, for 100 mol%, from 65 mol% to 95 mol% of monomer units derived from partially or totally salified 2-methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid, from 4.8 mol% to 25 mol% of monomer units derived from at least one neutral monomer chosen from the elements of the group constituted by 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, Ν,Ν-dialkyl acrylamides in which each of the alkyl groups comprises between one and four carbon atoms, and from 0.1 mol% to 5 mol% of monomer units derived from at least one monomer of formula (I).