Adhesive Tape for Cable Jacketing with Polymer Dispersion
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Solution Overview
Problem
Adhesive tapes for cable jacketing face challenges in achieving easy unwind, good flagging resistance, and compatibility across all temperature classes, with existing solutions either compromising on unwind force or temperature stability.
Innovation Solution
An adhesive tape with a textile carrier and a pressure-sensitive adhesive made from a polymer dispersion comprising n-butyl acrylate, ethylenically unsaturated monomers, and tackifiers, which is synthesized to have a specific composition and glass transition temperature for optimal bonding and redetachability, along with the addition of light stabilizers and fillers for enhanced properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive tapes use PSAs based on natural rubber to achieve good flagging resistance, then flagging resistance is improved, but unwind force increases over storage time and temperature
Solution Approach 1:
The patent changes the chemical composition parameters of the pressure-sensitive adhesive by using polymer dispersions with specific glass transition temperatures (below -50°C) and specific comonomer ratios (40-90% n-butyl acrylate and/or 2-ethylhexyl acrylate combined with 60-10% other ethylenically unsaturated monomers). This parameter optimization allows the adhesive to maintain low unwind force while achieving good flagging resistance, resolving the contradiction between these two properties.
2Temperature
If adhesive tapes use UV-crosslinkable polyacrylic esters to meet high temperature classes, then temperature stability is improved, but flagging resistance deteriorates
Solution Approach 1:
The patent optimizes the glass transition temperature parameter of the polymer dispersion to be below -50°C and carefully selects the monomer composition ratios. This creates an adhesive with sufficient low-temperature flexibility for good flagging resistance while maintaining high-temperature stability through the specific polymer structure and composition, thereby resolving the contradiction between temperature class compatibility and flagging resistance.
3Reliability
If adhesive tapes increase adhesive holding power to improve flagging resistance, then flagging resistance is improved, but cable insulation becomes brittle at elevated temperatures
Solution Approach 1:
The patent carefully controls the adhesive composition parameters including the ratio of n-butyl acrylate and/or 2-ethylhexyl acrylate (40-90%) to other ethylenically unsaturated monomers (60-10%), and ensures the glass transition temperature is below -50°C. This optimized composition provides sufficient adhesion for flagging resistance while maintaining cable compatibility across temperature classes T1 to T4, preventing insulation embrittlement.
4Ease of operation
If adhesive tapes use polymer dispersions with low glass transition temperature to improve unwind properties, then ease of unwind is improved, but flagging resistance deteriorates
Solution Approach 1:
The patent optimizes the glass transition temperature to be below -50°C and carefully balances the monomer composition (40-90% n-butyl acrylate and/or 2-ethylhexyl acrylate with 60-10% other ethylenically unsaturated monomers). This specific parameter optimization ensures the adhesive remains sufficiently flexible at low temperatures for easy unwind while maintaining adequate holding power for good flagging resistance, resolving the contradiction between these two operational properties.
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 adhesive tape exhibits improved flagging resistance, maintains easy unwind, and ensures cable compatibility across all temperature classes, including T3 and T4, with enhanced bond strength and stability.
Implementation Method 1
a pressure-sensitive adhesive which is applied on at least one side of the carrier
Implementation Method 2
the adhesive being in the form of a dried polymer dispersion, the polymer being synthesized from
Data Source
AI summary
An adhesive tape, especially for wrapping cables, consisting of a preferably textile carrier and of a pressure-sensitive adhesive which is applied on at least one side of the carrier and is in the form of a dried polymer dispersion, the polymer being synthesized from:a) 40% to 90% by weight of n-butyl acrylate and/or 2-ethylhexyl acrylateb) 0% to 10% by weight of an ethylenically unsaturated monomer having an acid or acid-anhydride functionc) 60% to 10% by weight of one or more ethylenically unsaturated monofunctional monomers different from (a) and (b)d) 0% to 1% by weight of a difunctional or polyfunctional monomerand the pressure-sensitive adhesive comprising between 15 and 100 parts by weight of a tackifier (based on the mass of the dried polymer dispersion).