Silicone Polyester Resin Crosslinking for Aqueous Deposition
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Solution Overview
Problem
Existing silicone polyester technologies fail to produce highly crosslinked resins that efficiently deposit on fibrous materials from aqueous solutions, lacking understanding of crosslink density and essential capping materials.
Innovation Solution
The development of novel silicone polyester compounds through the crosslinking of dimethicone copolyol with dimer acid at specific hydroxyl to carboxyl ratios, ensuring high crosslink density and water dispersibility, allowing for effective deposition on hair, skin, and fibers from dilute aqueous solutions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silicone polyesters are prepared by esterification of dimethicone copolyol with dimer acid, then crosslink density increases and conditioning performance improves, but deposition efficiency from aqueous solution decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the hydroxyl to carboxyl group ratio (0.7:1 to 1.4:1) and controlling the molecular weight of dimethicone copolyol (400-2000 g/mol) to achieve both high crosslink density and adequate water dispersibility. This resolves the contradiction by finding the optimal parameter range where sufficient crosslinking occurs while maintaining aqueous processability for effective deposition.
Solution Approach 2:
The invention creates a composite molecular structure combining dimethicone copolyol with dimer acid to form silicone polyester resins that possess dual characteristics: the crosslinked network structure provides conditioning strength while the aqueous dispersibility enables deposition. The composite nature of the resin allows simultaneous achievement of both high crosslink density and effective deposition from water-based solutions.
2Stability of the object's composition
If high crosslink density is achieved through proper hydroxyl to acid ratio, then resin stability and conditioning performance improve, but formulation complexity increases
Solution Approach 1:
The patent simplifies formulation by establishing a specific parameter range for hydroxyl to carboxyl ratio (0.7:1 to 1.4:1) that automatically ensures both resin stability and crosslink density without requiring additional stabilizing agents or complex formulation steps. This parameter optimization resolves the contradiction between stability and formulation simplicity.
3Strength
If dimethicone copolyol with at least 4 hydroxyl groups is used for crosslinking, then crosslink density and resin performance improve, but manufacturing precision requirements increase
Solution Approach 1:
The patent addresses manufacturing precision challenges by specifying a range (at least 4 hydroxyl groups per molecule) rather than requiring exact counts, and by providing guidance on selecting commercial dimethicone copolyols with appropriate molecular weights (400-2000 g/mol). This approach maintains high crosslink density while allowing reasonable manufacturing tolerances.
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 resulting compounds provide outstanding conditioning and delivery capabilities, achieving efficient deposition and conditioning of hair and skin at low concentrations, disrupting hydrogen bonds and achieving low free energy states.
Implementation Method 1
silicone polyesters which are prepared by crosslinking a dimethicone copolyol having at least 4 hydroxyl groups with a dimer acid
Implementation Method 2
disrupting hydrogen bonds and achieving low free energy states
Data Source
AI summary
The present invention relates to a series of novel silicone polyesters which are prepared by crosslinking a dimethicone copolyol having at least 4 hydroxyl groups with a dimer acid. The ratio of acid groups to hydroxyl groups ranges from 0.7 to 1.4 so that a significant number of groups are reacted and a significant number of crosslink groups are achieved.