PVC DINCH Plasticizer Adhesive Barrier Coating
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Solution Overview
Problem
Plasticizer migration from PVC substrates into pressure sensitive adhesive layers leads to undesirable shrinkage and poorer performance, particularly with the need to replace traditional phthalate plasticizers like DINCH, which requires improving the performance of plasticized PVC structures with pressure sensitive adhesive layers.
Innovation Solution
A method involving a PVC support with 5-40% DINCH plasticizer, coated with an aqueous crosslinkable polymeric layer containing reactive and complementary groups, followed by an uncrosslinked pressure sensitive adhesive layer, to form a crosslinked structure that reduces plasticizer migration and enhances performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DINCH plasticizer is added to PVC substrate to replace traditional phthalate plasticizers, then safety and regulatory compliance are improved, but plasticizer migration into adhesive layer increases causing shrinkage and performance degradation
Solution Approach 1:
A crosslinkable polymeric coating layer is applied as an intermediary barrier between the DINCH-plasticized PVC substrate and the pressure sensitive adhesive layer. This coating layer prevents plasticizer migration from the substrate to the adhesive, eliminating shrinkage and performance degradation while allowing the use of safe DINCH plasticizer replacement
Solution Approach 2:
The patent changes the chemical and physical parameters of the substrate surface by applying a crosslinked polymeric coating. This coating modifies the surface properties to create a barrier that blocks plasticizer diffusion, thereby preventing migration without affecting the bulk properties of the PVC substrate
2Ease of operation
If traditional phthalate plasticizers are used in PVC substrates, then flexibility and processability are improved, but safety and regulatory compliance deteriorate
Solution Approach 1:
The patent extracts and removes traditional phthalate plasticizers from the PVC substrate formulation and replaces them with DINCH plasticizers. The harmful phthalates are taken out of the system entirely, eliminating safety and regulatory issues while maintaining the necessary flexibility through alternative plasticizer chemistry
3Reliability
If crosslinkable polymeric coating is applied to prevent plasticizer migration, then adhesive performance is improved, but device complexity and manufacturing steps increase
Solution Approach 1:
The patent applies a polymeric coating with specific local properties (crosslinkable functionality) only at the interface between the substrate and adhesive layer where plasticizer migration occurs. This localized application provides targeted protection against migration while maintaining simplicity in other areas of the structure
Solution Approach 2:
The crosslinkable polymeric coating is applied and crosslinked in advance before the pressure sensitive adhesive layer is applied. This preliminary action creates a stable barrier layer that prevents plasticizer migration during subsequent adhesive application and curing processes, simplifying the overall manufacturing sequence
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 method results in reduced shrinkage and improved adhesive performance by minimizing plasticizer migration and maintaining the functionality of the pressure sensitive adhesive layer, as demonstrated by lower shrinkage and adhesive strength compared to comparative examples.
Implementation Method 1
each of said reactive groups are capable of forming a covalent bond with each of said complementary groups
Implementation Method 2
applying to said surface an aqueous crosslinkable polymeric coating
Implementation Method 3
drying and curing said structure
Data Source
AI summary
A polyvinyl chloride("PVC") structure including from 5% to 40% by weight, based on the weight of PVC, DINCH (1,2-cyclohexane dicarboxylic acid di-isononyl ester) plasticizer coated with a certain crosslinked polymeric coating and, disposed on the crosslinked coating, a substantially uncrosslinked pressure sensitive adhesive and a method for forming the structure is provided.