Curable Siloxane Composition with Modified Release Properties
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Solution Overview
Problem
Current curable siloxane compositions for release coatings face challenges in achieving a wide range of release levels, with existing Controlled Release Additives (CRA) slowing down cure rates and showing non-linear release force responses, leading to inefficiencies in coating processes and substrate interactions.
Innovation Solution
A curable siloxane composition comprising reactive siloxane polymers, siloxane cross-linking agents, catalysts or sensitizers, pressure-sensitive adhesives, and optional auxiliary additives, with specific ratios of siloxy units to achieve improved modified release properties and linear release force concentration relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If Controlled Release Additives (CRA) are added to achieve tight or modified release characteristics, then release force is improved, but cure rate slows down
Solution Approach 1:
The patent changes the chemical structure parameters of the siloxane polymer by controlling the ratio of T-units to Q-units (maintaining T:Q ratio between 0.1:1 and 1.5:1), which fundamentally alters the polymer's release characteristics without requiring high concentrations of CRA additives, thereby maintaining fast cure rates while achieving tight release properties
Solution Approach 2:
The patent creates a composite siloxane system combining linear siloxane polymers with specific T and Q units in controlled ratios, integrating multiple functional units within a single polymer structure to achieve both tight release characteristics and rapid curing without needing separate CRA additives
2Force
If high concentrations of CRA are used to achieve tight release, then release force increases exponentially, but processing efficiency decreases
Solution Approach 1:
The patent achieves tight release properties by changing the structural parameters of the siloxane polymer itself (T:Q ratio control) rather than relying on high concentrations of external additives, thereby maintaining processing efficiency while achieving the desired release characteristics
3Force
If MQ-resin types are used as CRA, then release force can be increased, but cure rate decreases and release response becomes non-linear
Solution Approach 1:
The patent changes from using external MQ-resin additives to modifying the fundamental structural parameters of the siloxane polymer backbone by controlling T and Q unit ratios, which provides linear and predictable release responses while maintaining consistent and fast cure rates
Solution Approach 2:
The patent extracts the release control function from separate CRA additives (MQ-resins) and integrates it directly into the siloxane polymer structure through controlled T:Q ratios, eliminating the need for high concentrations of external additives and their associated processing issues
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 composition provides a release layer with enhanced release properties on various substrates, maintaining a fast cure rate and efficient release performance across different concentrations, improving processing efficiency and substrate interactions.
Implementation Method 1
an effective amount of a siloxane cross-linking agent
Implementation Method 2
at least one component selected from the group of a catalyst, a sensibilizer and a radical initiator
Data Source
AI summary
The present invention relates to new curable siloxane compositions, and their use for the manufacture of cured products thereof having modified release properties. The modified release forces are achieved by incorporating a selected pressure sensitive adhesive additive.