Sulfonated Polyester Siloxane Release Coating Primerless Adhesion
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Solution Overview
Problem
The challenge in the release liner industry is achieving strong adhesion between polymer film substrates and functional coatings without the need for a primer layer, particularly for polyester-based substrates, while minimizing silicone migration.
Innovation Solution
A release coating composition comprising a sulfonated polyester siloxane polymer derived from organic diol, organic diacid, diester, carbinol terminated polydimethylsiloxane, and ion salt, combined with a water-soluble or water-dispersible second polymer and a thermally activated curing system, which can be directly applied to the substrate without a primer layer, ensuring adhesion and minimal silicone migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a primer layer is applied to polyester substrate, then adhesion between substrate and functional coating is improved, but processing complexity increases
Solution Approach 1:
The patent extracts and eliminates the primer layer from the coating system by incorporating adhesion-promoting functionality directly into the release coating composition itself. The sulfonated polyester siloxane polymer provides both adhesion to the polyester substrate and release functionality in a single integrated coating, removing the need for separate primer application steps.
Solution Approach 2:
The invention merges the adhesion promoter function and release coating function into a single integrated coating composition. The sulfonated polyester siloxane polymer combines the adhesive properties needed for substrate bonding with the silicone-based release properties, eliminating the need for separate primer and release coating layers.
2Reliability
If silicone release coating is applied to achieve release functionality, then release performance is improved, but silicone migration occurs
Solution Approach 1:
The patent modifies the chemical parameters of the silicone release coating by introducing sulfonation groups into the polyester siloxane polymer structure. This chemical modification changes the polarity and interaction properties of the coating, reducing silicone migration while maintaining release functionality through the modified polymer architecture.
Solution Approach 2:
The invention creates a composite polymer material combining polyester and siloxane components with sulfonation groups. This composite structure integrates the adhesion properties of polyester with the release properties of siloxane, while the sulfonation modifies the overall composition to reduce unwanted silicone migration.
3Strength
If primer layer is used to improve adhesion, then coating adhesion is improved, but manufacturing time increases
Solution Approach 1:
The patent removes the primer layer step from the manufacturing process by integrating adhesion functionality into the main release coating composition. This eliminates the sequential processing steps of applying primer, drying/curing primer, then applying release coating, reducing overall manufacturing time.
Solution Approach 2:
The invention incorporates adhesion-promoting chemical groups directly into the release coating polymer structure beforehand. This preliminary incorporation of adhesion functionality means no separate primer application is needed, as the coating itself is pre-configured to bond effectively to the substrate.
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 solution provides a robust adhesion between the release layer and the substrate, allowing for direct application without a primer, while maintaining minimal silicone migration, thus simplifying the processing steps and enhancing the performance of the release liner.
Implementation Method 1
a thermally activated curing system comprising a multifunctional compound
Implementation Method 2
heat setting the coated article to activate the curing system
Data Source
AI summary
Described herein is a release coating composition, articles made with the release coating composition and methods of making a release liner. The release coating composition comprising: (i) a sulfonated polyester siloxane polymer derived from: (a) at least one organic diol monomer, (b) at least one organic diacid monomer, at least one diester monomer or mixtures thereof; (c) at least one carbinol terminated polydimethylsiloxane, at least one carboxy terminated polydimethylsiloxane or mixtures thereof; and (d) at least one ion salt on a sulfonate difunctional monomer; (ii) a water-soluble or water-dispersible second polymer; and (iii) a thermally activated curing system, comprising a multifunctional compound.