Acrylate Adhesive Tape Coating on Textile Substrate
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Solution Overview
Problem
Existing methods for producing adhesive tapes with pressure-sensitive adhesives on textile carriers face issues such as adhesive breakthrough during coating, inadequate anchoring, and increased unwinding forces, particularly with acrylate dispersions and organic solutions, which affect the quality and usability of cable wrapping tapes.
Innovation Solution
A method involving the use of an aqueous acrylate dispersion with specific shear viscosities and additives to ensure full-surface wetting and anchoring on a calendered polyester fabric, preventing adhesive penetration and ensuring secure anchoring while allowing easy unwinding and hand-tearability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If acrylate dispersion is coated on open textile substrate, then adhesive can be applied to textile carrier, but adhesive bleeds through to the back causing back-side tackiness and increased unwinding force
Solution Approach 1:
The patent changes the viscosity parameter of the adhesive composition by adding hydrophobically modified associative thickeners, increasing viscosity from typical dispersion levels to 100-10,000 cP at 25°C. This parameter change prevents the adhesive from bleeding through the textile substrate while maintaining adequate wetting and anchoring properties.
Solution Approach 2:
The patent introduces hydrophobically modified associative thickeners as intermediary substances that modify the rheological properties of the adhesive dispersion. These thickeners act as mediators between the adhesive and textile substrate, controlling flow behavior to prevent breakthrough while ensuring proper anchoring during the coating process.
2Object-generated harmful factors
If adhesive viscosity is increased to prevent breakthrough, then adhesive anchoring may be improved, but coating processability and wetting of textile backing may be limited
Solution Approach 1:
The patent utilizes the dynamic rheological properties of hydrophobically modified associative thickeners, which exhibit shear-thinning behavior. The adhesive remains highly viscous at rest to prevent breakthrough, but becomes more fluid under the shear conditions of coating application, ensuring proper wetting and coating processability.
Solution Approach 2:
The patent carefully controls the viscosity parameter within the optimal range of 100-10,000 cP at 25°C, balancing the competing requirements of preventing breakthrough while maintaining coating processability. This parameter optimization ensures both adequate anchoring and manufacturability.
3Temperature
If polyacrylate adhesive is used for temperature resistance, then temperature class performance is improved, but chemical stability deteriorates compared to polyacrylates
Solution Approach 1:
The patent creates a composite adhesive system combining polyacrylate polymer base with hydrophobically modified associative thickeners. This composite formulation achieves the temperature resistance of polyacrylates while the thickener system enhances chemical stability and prevents the chemical degradation issues associated with pure polyacrylate adhesives.
Data Source
Figure 1
AI summary
Producing an adhesive tape comprising a textile carrier (1) and a pressure-sensitive adhesive coated on one side of it, is claimed, where the pressure-sensitive adhesive has a shear viscosity of, at a temperature of 25[deg] C during coating from dispersion, 200-100000 Pa.s at a shear rate of 10 -> 2>s -> 1>and 0.1-10 Pa.s at a shear rate of 100 s -> 1>.