Bio-Based Pressure-Sensitive Adhesive for Adhesion-Cohesion Balance
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Solution Overview
Problem
Existing aqueous pressure-sensitive adhesives struggle to achieve a balance between adhesion and cohesion while maintaining a reduced carbon footprint, particularly in self-adhesive labels, and there is a need for adhesives based on partially or completely biobased monomers that meet these requirements.
Innovation Solution
A pressure-sensitive adhesive composition is formulated through emulsion polymerization using 2-octyl acrylate, styrene, hydroxyalkyl acrylate, and monomers with acid groups, with specific weight percentages and glass transition temperatures below −20°C, utilizing bio-based monomers to enhance adhesion/cohesion balance and reduce environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If adhesion is increased to ensure high labelling line speeds, then adhesion is improved, but cohesion is reduced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the glass transition temperature (Tg) of the adhesive polymer within a specific range (below -20°C, preferably -30°C to -10°C) and adjusting the monomer composition ratios. This optimization of physical and chemical parameters enables the adhesive to achieve both high adhesion for fast labelling and sufficient cohesion for good convertibility, resolving the trade-off between these two properties.
Solution Approach 2:
The patent uses composite materials by formulating the adhesive polymer from multiple monomers including 2-octyl acrylate, styrene, hydroxyalkyl acrylate, and monomers with acid groups. This multi-component polymer system combines the beneficial properties of each monomer to achieve both high adhesion and cohesion, eliminating the need to sacrifice one property for the other.
2Object-affected harmful factors
If biobased monomers are used to reduce carbon footprint, then environmental impact is reduced, but adhesion/cohesion balance may be compromised
Solution Approach 1:
The patent maintains reliability by optimizing the Tg parameter (below -20°C) and carefully controlling the composition ratios of biobased monomers. This parameter optimization ensures that even with biobased monomers, the adhesive achieves the required adhesion/cohesion balance for high-performance labelling applications.
Solution Approach 2:
The patent employs composite materials by creating a multi-component polymer system that incorporates biobased monomers (2-octyl acrylate, hydroxyalkyl acrylate, acid group monomers) combined with other monomers. This composite approach allows the adhesive to maintain excellent adhesion/cohesion balance while reducing carbon footprint through the use of renewable resources.
3Productivity
If high tack is achieved for high labelling line speeds, then productivity is improved, but convertibility is reduced
Solution Approach 1:
The patent resolves this contradiction by optimizing the Tg parameter to be below -20°C (preferably -30°C to -10°C) and controlling the monomer composition within specific ranges. This parameter optimization creates an adhesive with balanced properties that enables both high labelling line speeds and good convertibility, eliminating the trade-off between productivity and ease of operation.
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 composition achieves a high level of adhesion/cohesion balance comparable to or exceeding that of fossil-based adhesives, with a reduced carbon footprint, suitable for self-adhesive labels and other applications.
Implementation Method 1
a dispersed pressure-sensitive adhesive polymer formed by emulsion polymerization of (i) from 10 to 95% by weight, based on the sum of all monomers, of 2-octyl acrylate
Implementation Method 2
formed by emulsion polymerization of (i) from 10 to 95% by weight, based on the sum of all monomers, of 2-octyl acrylate; (ii) from 0.1 to 5% by weight based on the sum of all monomers, of styrene
Implementation Method 3
Pressure-sensitive adhesive compositions in the form of aqueous polymer dispersions comprising at least one dispersed pressure-sensitive adhesive polymer
Implementation Method 4
Pressure-sensitive adhesive compositions in the form of aqueous polymer dispersions comprising at least one dispersed pressure-sensitive adhesive polymer
Data Source
AI summary
Described is a pressure-sensitive adhesive composition in the form of an aqueous polymer dispersion comprising a dispersed pressure-sensitive adhesive polymer formed by emulsion polymerization of 2-octyl acrylate, styrene, hydroxyalkyl acrylate, monomers having at least one acid group in specific amounts and optionally further monomers. The pressure-sensitive adhesive composition may be used to produce self-adhesive articles such as self-adhesive labels, self-adhesive tapes or self-adhesive films.