PVC Adhesive Tape DOTP Plasticizer REACH Compliance
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Solution Overview
Problem
The use of bis(2-ethylhexyl)phthalate (DOP) and dibutyl phthalate (DBP) in pressure-sensitive adhesive tapes is restricted under the REACH regulation, necessitating the development of alternative plasticizers that maintain excellent tackiness and unwindability.
Innovation Solution
A pressure-sensitive adhesive tape with a poly(vinyl chloride) substrate containing 10 to 40 percent by weight of bis(2-ethylhexyl)terephthalate, combined with a (meth)acrylic pressure-sensitive adhesive layer and a backing-agent layer, which ensures excellent tackiness and unwindability while avoiding the use of DOP and DBP.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DOP or DBP is used as a plasticizer in the PVC substrate, then the tape achieves good flexibility and processability, but the tape becomes restricted under REACH regulation and cannot be used in the EU
Solution Approach 1:
The patent changes the chemical parameter of the plasticizer from DOP/DBP to DOTP (bis(2-ethylhexyl)terephthalate), maintaining the required plasticizing effect while achieving REACH compliance. The specific content range of 10-40% by weight of DOTP is optimized to balance compliance with performance requirements.
2Reliability
If an alternative plasticizer is used to replace DOP and DBP, then REACH compliance is achieved, but the tackiness and unwindability may be compromised
Solution Approach 1:
The patent optimizes the DOTP content parameter within 10-40% by weight range to maintain both REACH compliance and operational performance. This parameter optimization ensures the tape achieves satisfactory tackiness and unwindability while using the alternative plasticizer.
Solution Approach 2:
The patent creates a composite system combining PVC substrate with DOTP plasticizer and (meth)acrylic pressure-sensitive adhesive layer, where the synergistic interaction between components maintains overall performance despite the plasticizer substitution.
3Reliability
If the DOTP content is increased to ensure flexibility, then REACH compliance is maintained, but the unwinding force increases beyond acceptable levels
Solution Approach 1:
The patent precisely controls the DOTP content parameter within the 10-40% by weight range, preventing excessive plasticization that would cause high unwinding force. The lower limit of 10% ensures sufficient flexibility while the upper limit of 40% prevents excessive softening.
Data Source
AI summary
A pressure-sensitive adhesive tape that uses, as a plasticizer, an alternative compound to bis(2-ethylhexyl) phthalate (DOP) and dibutyl phthalate (DBP), having excellent tackiness, and can be unwound satisfactorily, where DOP and DBP are to be restricted under the REACH regulation. The pressure-sensitive adhesive tape includes a poly(vinyl chloride) substrate and a pressure-sensitive adhesive layer. The pressure-sensitive adhesive layer is disposed on or over one side of the substrate. The poly(vinyl chloride) substrate contains 10 to 40 percent by weight of bis(2-ethylhexyl) terephthalate. The pressure-sensitive adhesive tape preferably has an unwinding force of 0.4 N/20 mm or less at a tensile speed of 0.3 m/min and an unwinding force of 1.2 N/20 mm or less at a tensile speed of 30 m/min.