Repulpable Pressure-Sensitive Adhesive for Paper Bonding
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Solution Overview
Problem
Existing adhesive masses for paper applications lack sufficient tackiness, repulpability, and resistance to calcium ions, while also failing to provide consistent shear strength and adhesion on both polar and non-polar papers.
Innovation Solution
A poly(meth)acrylate-based adhesive mass with a specific monomer composition, including 10-30% of a monomer according to the formula CH2=CH-C(O)NR1R2, 60-80% ethyldiglycolacrylate, and 0.5-10% of acrylic acid, methacrylic acid, or (C2-C4)-hydroxyalkyl (meth)acrylates, which enhances tackiness, repulpability, and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesive compositions are used, then adhesive strength is achieved, but tackiness is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific monomers (N-alkyl-acrylamides with 2-10 carbon atoms, N,N-dialkyl-acrylamides with 4-10 carbon atoms in the alkyl groups) and controlling their ratios (5-20 wt% and 0.5-5 wt% respectively) to achieve both high tackiness and adhesive strength, resolving the contradiction between these two properties
Solution Approach 2:
The patent creates a composite adhesive system combining multiple polymer components with specific functional monomers in defined proportions, where the synergistic interaction between different monomer types (acrylamides, dialkyl-acrylamides, and other copolymerizable monomers) achieves both immediate tackiness and sustained adhesive strength
2Strength
If adhesive mass is applied for permanent bonding, then adhesion strength is improved, but repulpability deteriorates
Solution Approach 1:
The patent carefully controls the molecular structure parameters of the adhesive polymers by selecting specific monomers with controlled carbon chain lengths (2-10 for N-alkyl, 4-10 for dialkyl groups) and maintaining appropriate compositional ratios, enabling the adhesive to balance strong bonding with water solubility for repulpability
Solution Approach 2:
The patent introduces functional monomers with specific local chemical properties (polar amide groups, hydrophilic characteristics) at strategic positions in the polymer structure, creating localized zones that provide water solubility and repulpability while maintaining overall adhesive strength through the composite polymer matrix
3Stability of the object's composition
If adhesive mass resists calcium ions, then aging stability is improved, but initial tackiness deteriorates
Solution Approach 1:
The patent adjusts the chemical composition parameters by incorporating amide-containing monomers with specific alkyl chain lengths (2-10 carbon atoms) that provide calcium ion resistance through chelation, while controlling the concentration (5-20 wt%) to maintain sufficient initial tackiness through the balanced polymer structure
Solution Approach 2:
The patent creates a composite polymer system where amide-functionalized polymers work synergistically with other copolymerizable monomers, combining the calcium-resistant properties of the amide groups with the tackiness-providing characteristics of the overall polymer matrix, achieving both aging stability and initial tackiness
4Adaptability or versatility
If adhesive mass bonds polar and non-polar papers, then versatility is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent designs a universal adhesive composition containing multiple types of copolymerizable monomers with different functional characteristics (polar amide groups, hydrophobic alkyl chains, carboxylic acid groups) that can simultaneously interact with both polar and non-polar paper surfaces, achieving broad bonding versatility while maintaining consistent performance through controlled formulation
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 mass exhibits high tackiness, good repulpability, and strong adhesion on various papers, with improved resistance to calcium ions and shear strength, making it suitable for both temporary and permanent bonding applications.
Implementation Method 1
pressure-sensitive adhesive based on a special poly(meth)acrylate, which is particularly suitable for bonding paper
Implementation Method 2
high resistance to migrating calcium ions from white-coated or CaCO3-filled paper
Data Source
AI summary
A repulpable pressure-sensitive adhesive is to be provided that is suitable for use on both polar and non-polar papers and is stable during storage. This is achieved with a pressure-sensitive adhesive containing at least one polymer whose underlying monomer composition is: a) 10 to 30 wt.% of at least one compound according to formula (I) CH2=CH-C(O)NR1R2 (I), wherein R1 represents an unsubstituted alkyl group, a hydroxyalkyl group, or an acetonyl group, and R2 represents a hydrogen atom, an unsubstituted alkyl group, a hydroxyalkyl group, an acetonyl group, or an aminoalkyl group; b) 60 to 80 wt.% of at least one compound according to formula (II) CH2=CH-C(O)O-(CH2)2-O-R3 (II), wherein R3 represents an unsubstituted alkyl group, an alkoxyalkyl group, or a (polyalkoxy)alkyl group; and c) 0.5 to 10 wt.The invention comprises at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, and (C2-C4 hydroxyalkyl) acrylates. The invention also relates to an adhesive tape comprising such an adhesive compound and the use of an adhesive compound and/or an adhesive tape according to the invention for producing water-soluble bonds.