Adhesion Primer for Tapes on Difficult Substrates
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Solution Overview
Problem
Current primers fail to provide optimal adhesion for adhesive tapes on difficult substrates like galvanized steel and olefin-based thermoplastic elastomers, such as PP/EPDM, allowing for temporary repositioning and long-term strong bonding, while also preventing moisture infiltration and corrosion.
Innovation Solution
A primer composition comprising a pressure-sensitive adhesive with specific monomer ratios of acrylic acid esters, thermal crosslinkers, and chlorinated polyolefins, which forms a slow-adhering yet durable bond, allowing for initial removability and long-term cohesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a primer provides strong adhesion immediately after application, then the bonding strength is improved, but the adhesive tape cannot be removed or repositioned without destruction
Solution Approach 1:
The primer composition creates a dynamic adhesion profile where the adhesive properties change over time. Initially, the primer allows easy removal and repositioning of the adhesive tape, but after a bonding time of three or more days, it develops strong adhesion that only destroys the tape upon removal. This time-dependent transformation resolves the contradiction between immediate removability and long-term bonding strength.
2Duration of action of stationary object
If a primer enables long-term strong bonding, then the durability is improved, but moisture infiltration and corrosion occur
Solution Approach 1:
The primer acts as an intermediary layer between the substrate and the adhesive tape, providing both adhesion promotion and protection against moisture infiltration. The specific composition including pressure-sensitive adhesive, thermal crosslinker, and chlorinated polyolefin creates a barrier that prevents moisture and corrosion from reaching the substrate, thereby resolving the contradiction between long-term bonding durability and resistance to harmful environmental factors.
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 primer enables adhesive tapes to be initially removable and repositionable within three minutes, then forms a strong, cohesive bond after three days, resisting moisture infiltration and corrosion under extreme conditions.
Implementation Method 1
the mixture in accordance with claim 1, wherein the concentration of the sum of the thermal crosslinkers based on the sum of the base polymer components of the pressure-sensitive adhesive is between 0.05% by mass and 5.0% by mass
Implementation Method 2
A primer composition comprising a pressure-sensitive adhesive with specific monomer ratios of acrylic acid esters
Implementation Method 3
at least one chlorinated polyolefin, which can optionally be modified with an α, β-unsaturated carboxylic acid or its anhydride
Data Source
AI summary
The method relates to a primer comprising a mixture, dissolved or dispersed in one or more solvents, of I) a pressure-sensitive adhesive comprising at least one base polymer component obtainable by free-radical copolymerization of the following monomers: a) at least one acrylic ester of a linear, primary alcohol having 2 to 10 carbon atoms in the alkyl radical of the alcohol, b) at least one acrylic ester of a branched, acyclic alcohol having 4 to 12 carbon atoms in the alkyl radical of the alcohol, c) 8 to 15 per cent by mass of acrylic acid, based on the sum of the monomers, d) optionally up to 10 per cent by mass of further copolymerizable monomers, based on the sum of the monomers, II) at least one thermal crosslinker based on a metal acetylacetonate, a metal alkoxide or an alkoxy metal acetylacetonate, III) at least one chlorinated polyolefin, characterized in that the concentration of the sum of the thermal crosslinkers based on the sum of the base polymer components of the pressure-sensitive adhesive is in the range from 0.05 per cent by mass to 5.0 per cent by mass.