Multilayer PVC Adhesive Tapes with Controlled Plasticizer
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Solution Overview
Problem
Existing vinyl electrical tapes and sheets face challenges in achieving optimal mechanical properties and cost control due to the use of traditional polyvinylchloride (PVC) substrates with high plasticizer content, which limits the flexibility and performance of these tapes.
Innovation Solution
The development of adhesive tapes featuring a multilayer film backing composed of plasticized polyvinyl chloride (PVC) with more than 25 wt-% PVC and incorporating one or more fillers, along with a primer layer and a pressure-sensitive adhesive layer, enhances mechanical properties and cost control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional polyvinylchloride substrates with high plasticizer content (up to 60 wt-%) are used, then excellent mechanical properties such as elongation are achieved, but cost control becomes difficult and chemical resistance deteriorates
Solution Approach 1:
The patent changes the plasticizer content parameter from traditional high levels (up to 60 wt-%) to a controlled range (20-40 wt-%), and modifies the PVC resin type parameter by specifying K-values (55-85) to achieve optimal balance between mechanical properties and chemical resistance while improving cost control
Solution Approach 2:
The patent creates a composite adhesive system combining modified PVC resin with specific polymer adhesives (acrylic, rubber-based, or polyurethane) and tackifying resins, resulting in an adhesive composition that achieves superior adhesion and mechanical properties without requiring excessive plasticizers
2Strength
If traditional polyvinylchloride substrates with high plasticizer content are used, then excellent mechanical properties such as elongation are achieved, but chemical resistance deteriorates
Solution Approach 1:
The patent modifies the chemical composition parameters by selecting PVC resin with specific K-values (55-85) and controlling plasticizer content (20-40 wt-%), which improves chemical resistance while maintaining adequate mechanical properties through the synergistic effect of the adhesive composition
3Ease of manufacture
If plasticizer content is reduced for better cost control and chemical resistance, then chemical resistance and cost control improve, but mechanical properties such as elongation deteriorate
Solution Approach 1:
The patent develops a composite adhesive formulation that combines modified PVC resin with specific polymer adhesives and tackifying resins, where the synergistic interaction of components compensates for reduced plasticizer content, maintaining mechanical properties while achieving cost control and improved chemical resistance
Solution Approach 2:
The patent applies different functional components at different levels: the modified PVC resin provides base structure with controlled plasticizer (20-40 wt-%), while specific polymer adhesives and tackifying resins are added to locally enhance adhesion and mechanical properties in the adhesive composition
Data Source
Figure 1A~1B
AI summary
Multilayer films and adhesive tapes that include such films, wherein the multilayer films include plasticized polyvinyl chloride and optionally one or more fillers.