Silicone Composition with Reactive End-Groups and Polyether Pendant
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Solution Overview
Problem
There is a need for organosilicone compositions with two reactive end-groups other than amino groups and one or more pendant polyether groups on the siloxane chain, which can provide enhanced properties such as surface activity, friction reduction, lubricity, impact strength, hydrophilicity, and oleophilicity, and for methods to selectively prepare these compositions.
Innovation Solution
The development of silicone compositions with specific formulas (M1)a(D1)b(D2)c and (M2)h(D3)i(D4)j, where M1, D1, D2, D3, and D4 are defined by specific monovalent hydrocarbon radicals and poly(oxyalkyl) hydrocarbon radicals, and a method involving the reaction of a silicone with a cyclic hydrosiloxane and an unsaturated polyether to form the desired organosilicone hydride, which then reacts to form the final silicone composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If organosilicones with amino end-groups are used, then reactivity with aldehyde functional groups is achieved, but the desired combination of properties (surface activity, friction reduction, lubricity, impact strength, hydrophilicity, and oleophilicity) is not fully obtained
Solution Approach 1:
The patent changes the end-group parameter from amino groups to other reactive groups (hydroxyl, carboxyl, epoxy) to achieve the desired combination of properties while maintaining reactivity and robustness for demanding applications
Solution Approach 2:
The patent creates composite organosilicone structures combining polyether pendant groups with reactive end-groups (other than amino) to achieve multiple desired properties simultaneously, including surface activity, friction reduction, lubricity, impact strength, hydrophilicity, and oleophilicity
2Adaptability or versatility
If conventional organosilicones are used, then basic functionality is achieved, but enhanced surface activity and hydrophilicity are not obtained
Solution Approach 1:
The patent introduces polyether pendant groups at specific locations on the siloxane chain to locally enhance hydrophilicity and surface activity without requiring complete structural complexity throughout the entire molecule
Solution Approach 2:
The patent pre-forms organosilicones with reactive end-groups and polyether pendant groups during synthesis, so that the enhanced surface activity and hydrophilicity are built-in from the beginning rather than requiring subsequent modifications
3Manufacturing precision
If selective preparation methods are not used, then production simplicity is maintained, but the specific organosilicone composition with desired properties cannot be achieved
Solution Approach 1:
The patent segments the synthesis into distinct steps: first forming the organosilicone backbone with specific end-groups, then adding polyether pendant groups through controlled reactions, allowing precise compositional control while maintaining manufacturing feasibility
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 silicone compositions exhibit improved hydrophilicity and other desired properties, making them suitable for various end-use applications, including personal care, home care, and textile treatments, by reducing the contact angle and enhancing surface activity and friction reduction.
Implementation Method 1
a method involving the reaction of a silicone with a cyclic hydrosiloxane and an unsaturated polyether to form the desired organosilicone hydride, which then reacts to form the final silicone composition
Data Source
AI summary
A silicone composition comprising a formula: (M1)a(D1)b(D2)c wherein M1=R1R2R3SiO1/2; D1=R4R5SiO2/2; and D2=R6R7SiO2/2; wherein R1 is independently at each occurrence a monovalent hydrocarbon radical comprising a reactive end- group other than an amino group; R6 comprises a monovalent poly(oxyalkyl) hydrocarbon radical; and R2, R3, R4, R5, and R7 are independently monovalent hydrocarbon radicals; wherein a, b, and c are stoichiometric subscripts that are zero or positive subject to the following limitations: a is greater than or equal to 2; c is greater than or equal to 1; and when b=0, a+c is greater than or equal to 3 is disclosed.