Silane-Functionalized Polymer Sealants Resolving Phase Separation
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Solution Overview
Problem
High performance adhesives, coatings, and sealants based on organic and silicone polymers face issues such as low weather stability, dirt pickup, staining, poor adhesion to certain substrates, and phase separation due to immiscibility, necessitating new polymer compositions that maintain performance and stability.
Innovation Solution
The development of polymer compositions comprising 1-99% of an organic polymer with silane groups as a compatibilizer, 1-45% of a reactive or non-reactive organopolysiloxane polymer, and 0-98% of an organic polymer without silane groups, which prevents phase separation and enhances weather stability and adhesion, allowing for 1-part or 2-part curable systems that can be thermally or room temperature curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicone polymer is used to improve weather stability, then weather stability is improved, but dirt pickup and staining increase
Solution Approach 1:
The patent creates a composite polymer system combining silicone polymer with organic polymer containing silane groups. This composite approach allows the formulation to achieve weather stability from the silicone component while the organic silane-containing polymer reduces dirt pickup and staining, thus resolving the contradiction between these two properties.
Solution Approach 2:
The patent modifies the chemical composition parameters by incorporating organic polymers with silane groups at specific weight ratios (1-99% of total polymer). This parameter change enables the adhesive to maintain the weather stability benefit of silicone while reducing the harmful staining effect through the presence of silane-functionalized organic polymer segments.
2Object-generated harmful factors
If organic polymer is used to reduce dirt pickup, then dirt pickup decreases, but adhesion to certain substrates deteriorates
Solution Approach 1:
The patent formulates a composite system combining organic polymer with silicone polymer containing silane groups. The organic polymer component reduces dirt pickup while the silicone polymer with silane groups provides enhanced adhesion to substrates through silane bonding mechanisms, thus resolving the adhesion deficit that would otherwise result from using organic polymer alone.
Solution Approach 2:
The patent introduces silane groups specifically into the organic polymer structure (at 1-99% weight ratio), creating localized regions with enhanced substrate bonding capability. This local quality enhancement allows the organic polymer to maintain its low dirt pickup property while gaining improved adhesion through the silane-functionalized segments.
3Adaptability or versatility
If silicone polymer and organic polymer are blended to combine benefits, then performance is improved, but phase separation occurs due to immiscibility
Solution Approach 1:
The patent uses silane groups as a chemical intermediary between the organic polymer and silicone polymer phases. The silane-functionalized organic polymer acts as a compatibilizer that facilitates mixing and reduces phase separation between the otherwise immiscible organic and silicone polymer phases, enabling stable blending while maintaining the performance benefits of both components.
Solution Approach 2:
The patent modifies the compositional parameters by incorporating organic polymer containing silane groups at controlled weight ratios (1-99% of total polymer). This parameter change enables miscibility between organic and silicone phases through the silane functionality, allowing the formulation to combine the performance benefits of both polymer types while maintaining composition stability and preventing phase separation.
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 polymer compositions provide improved weather stability and performance, preventing phase separation and enhancing adhesion, with the ability to be used as coatings, sealants, or adhesives, and can include additional additives for modified properties, achieving long-term durability and resistance to environmental factors.
Implementation Method 1
the compatibilizer is an organic polymer that is partially or fully end-capped with silane groups. The present polymer compositions are based, at least in part, on the inventors' discovery that sealants based on polymer compositions that comprise both a silicone polymer and an organic polymer that comprises silane groups do not phase separate as readily as compositions lacking the present compatibilizer.
Implementation Method 2
The present sealant, adhesive, and coating compositions may be 1-part curable compositions or 2-part curable compositions. The present sealant, adhesive, and coating compositions may be either thermally curing systems or room temperature curing systems.
Data Source
AI summary
Polymer compositions for preparing sealants, adhesives and coatings are provided. The polymer compositions comprise from 1 to 99% by weight of an organic polymer comprising functional silane groups, from 1 to 45% by weight (based on total polymer) of at least one reactive or non-reactive organopolysiloxane polymer; from 0 to 98% by weight (based on total polymer) of an organic polymer that lacks functional silane groups.