PVC Film Stabilizer System for Aqueous PSA Unwinding
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Solution Overview
Problem
The transition from solvent-type to aqueous dispersion-type PSA compositions in PVC film-backed PSA sheets for binding electrical cords results in compromised unwinding facilitation, especially at low temperatures, due to bleeding of lead-free metal soap stabilizers, leading to unstable and insufficient unwinding.
Innovation Solution
A PVC film composition is developed using a mixture of alkali earth metal soap, such as calcium stearate, and zinc laurate as stabilizers, with specific mass ratios to suppress bleeding and maintain moldability and rolling facilitation, allowing for smooth unwinding even with aqueous dispersion-type PSA layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aqueous dispersion-type PSA composition is used instead of solvent-type, then environmental performance is improved, but unwinding facilitation deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the stabilizer system by using a mixed metal soap composition (calcium stearate and zinc laurate) instead of conventional single stabilizers. This parameter change allows the aqueous dispersion-type PSA to maintain proper unwinding facilitation while preserving environmental benefits
Solution Approach 2:
The patent employs a composite stabilizer system combining calcium stearate and zinc laurate in specific ratios. This composite approach creates synergistic effects that prevent the bleeding phenomenon and maintain unwinding facilitation when using environmentally friendly aqueous dispersion-type PSA compositions
2Object-affected harmful factors
If lead-free metal soap stabilizer is used, then health safety is improved, but bleeding increases causing unwinding problems
Solution Approach 1:
The patent uses a composite stabilizer system combining calcium stearate and zinc laurate in specific ratios (0.01-5 parts by mass relative to 100 parts PVC). This composite approach prevents the bleeding phenomenon while maintaining lead-free health safety benefits
Solution Approach 2:
The patent optimizes the concentration and type parameters of the stabilizer by selecting specific metal soaps (calcium stearate and zinc laurate) in controlled amounts. This parameter optimization prevents bleeding while maintaining health safety
3Strength
If aqueous dispersion-type PSA composition is used, then adhesive performance is maintained, but unwinding stability deteriorates at low temperatures
Solution Approach 1:
The patent changes the stabilizer composition parameters to a mixed metal soap system that remains effective across a wide temperature range. This allows the aqueous dispersion-type PSA to maintain both adhesive performance and unwinding stability even at low temperatures
Data Source
Figure 1
AI summary
Provided is a PSA sheet comprising a PVC film (support) provided with PSA layer formed of an aqueous dispersion-type PSA composition, which exhibits a smooth unwinding motion. The PVC film can be obtained by molding a PVC composition comprising PVC and a metal soap. The metal soap comprises an alkali earth metal soap and zinc soap. At least part of the alkali earth metal soap is a stearate and at least part of the zinc soap is zinc laurate.