ABA Silicone Polyalkyleneoxide Copolymer for Clean-Feel Conditioning
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Solution Overview
Problem
High molecular weight non-hydrolyzable linear random block aminosilicone-polyalkyleneoxide copolymers are impractical due to increased viscosities, making them difficult to handle and formulate as effective conditioning agents for hair care and skin care, while existing products struggle to provide both conditioning and clean after-feel.
Innovation Solution
A linear tri-block copolymer with a structure of ABA, comprising polyalkyleneoxide units and internal polysiloxane units, is developed, where the polyalkyleneoxide units cap the structure, allowing for the creation of a thickened aqueous system that enhances conditioning and shine while maintaining a clean feel, achieved through a specific reaction method involving epoxy-endblocked polysiloxanes and amino-functionalized polyalkyleneoxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high molecular weight non-hydrolyzable linear random block aminosilicone-polyalkyleneoxide copolymers are used to improve tactile properties and conditioning, then the conditioning effect is improved, but the viscosity increases making handling and formulation difficult
Solution Approach 1:
The copolymer is segmented into a specific ABA tri-block structure where A represents polyalkyleneoxide units and B represents internal polysiloxane units. This segmented architecture allows the polymer to maintain high molecular weight for effective conditioning while the specific block arrangement controls viscosity and improves handleability compared to random block structures.
2Reliability
If high molecular weight copolymers are used to provide conditioning, then the conditioning performance is improved, but the viscosity increases affecting product formulation
Solution Approach 1:
The invention changes the architectural parameters of the copolymer by specifying an ABA tri-block structure with particular unit arrangements. This parameter change allows achieving high molecular weight (for conditioning performance) while controlling the viscosity through the specific block configuration, thereby facilitating formulation into hair care and skin care products.
3Reliability
If conventional amino silicones and random block copolymers are used, then conditioning is provided, but clean after-feel is not achieved
Solution Approach 1:
The ABA tri-block structure provides local quality differentiation where the polyalkyleneoxide end blocks (A units) provide hydrophilic character for clean after-feel, while the internal polysiloxane unit (B) provides the conditioning effect. This spatial differentiation of functions within the single polymer molecule achieves both conditioning and clean after-feel simultaneously.
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 linear tri-block copolymer effectively improves the tactile properties of hair and textile substrates, providing better conditioning and combability compared to conventional amino silicones and random block copolymers, while maintaining a clean after-feel, and can be formulated into various personal care products.
Implementation Method 1
reacting a compound of the general formula (2): Q(CaH2aO)bR2[SiO(R1)2]cSi(R1)2R2(OCaH2a)bQ and a compound of the general formula (3): R5O(CaH2aO)dZ, wherein R1, R2, R5, a, b, c and d are as defined and each Q independently and Z is either a primary or secondary amine, or an epoxy-containing group
Data Source
AI summary
There is provided herein a linear tri-block copolymer having the average formula (1):ABA (1)wherein A is a polyalkyleneoxide unit or an aliphatic modified polyalkyleneoxide unit both of the general formula: R5O(CaH2aO)dY and wherein B is an internal polysiloxane unit of the general formula:[X(CaH2aO)bR2[SiO(R1)2]cSi(R1)2R2(OCaH2a)bX]wherein X and Y are divalent organic groups selected from a secondary amine or a tertiary amine and a ring-opened epoxide, such that when X is a ring-opened epoxide, Y is a secondary or tertiary amine, and when Y is a ring-opened epoxide, X is a secondary or tertiary amine. In addition, there is provided herein a method of making a linear tri-block copolymer having the average formula (1) and personal care and softener compositions comprising the same, specifically a hair conditioner.