Waterborne Adhesive Slip Agent Compatibility
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Solution Overview
Problem
Waterborne adhesive compositions face challenges in maintaining the low coefficient of friction of substrates containing slip agents, as slip agents tend to migrate into the adhesive, leading to increased friction, and existing methods are ineffective due to incompatibility issues with water-based systems.
Innovation Solution
A waterborne adhesive composition comprising a vinyl polymer with 90% or more polymerized units of vinyl monomers, including 0 to 0.4% ionic monomer and 0.1% to 10% acrylamide or methacrylamide units, which maintains stability and prevents slip agent depletion without phase separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slip agent is added to the adhesive composition to prevent depletion from substrate, then substrate coefficient of friction is maintained, but waterborne adhesive composition becomes unstable and undergoes phase separation
Solution Approach 1:
The patent introduces an intermediary substance (ammonium salt of fatty acid or quaternary ammonium compound) that acts as a mediator between the hydrophilic waterborne adhesive and the hydrophobic slip agent. This intermediary enables the slip agent to be incorporated into the waterborne adhesive composition without causing phase separation, thereby maintaining both composition stability and preventing slip agent depletion from the substrate
Solution Approach 2:
The patent changes the chemical form of the slip agent by converting it to an ammonium salt or quaternary ammonium compound. This parameter change in the molecular structure and charge state of the slip agent allows it to be compatible with waterborne systems, enabling it to remain dissolved in the adhesive composition without causing instability or phase separation
2Stability of the object's composition
If conventional slip agent incorporation method is used with waterborne adhesive, then adhesive composition remains stable, but slip agent cannot be effectively added and substrate friction increases
Solution Approach 1:
The patent changes the chemical form of the slip agent by converting it to an ammonium salt or quaternary ammonium compound. This parameter change in the molecular structure and charge state of the slip agent allows it to be compatible with waterborne systems, enabling it to remain dissolved in the adhesive composition without causing instability or phase separation
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 solution effectively maintains the low coefficient of friction of substrates by preventing slip agent migration into the adhesive, ensuring mechanical stability and compatibility in waterborne systems.
Implementation Method 1
Slip agents are not normally soluble in water, and addition of slip agent to a waterborne composition usually results in a mixture that is unacceptable because of phase separation, instability, or other undesirable result of incompatibility of the ingredients
Implementation Method 2
the presence of slip agent in the layer of adhesive composition will reduce the tendency toward depletion of slip agent from the substrate
Data Source
AI summary
There is provided a waterborne adhesive composition comprising a vinyl polymer that comprises a) 0 to 0.4% polymerized units of ionic monomer, by weight based on the weight of said vinyl polymer, and (b) 0.1% to 10% polymerized units of one or more monomer selected from the group consisting of acrylamide, methacrylamide, and mixtures thereof, by weight based on the weight of said vinyl polymer.