Water-Based Adhesive Bonding Cellulose Substrates
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Solution Overview
Problem
Current water-based adhesive compositions used in the rigid packaging and bookbinding industries face challenges in bonding cellulose-based substrates, particularly those coated with UV primers, due to high coating density and difficulty in water penetration, and require fast setting properties suitable for high-speed continuous processes.
Innovation Solution
A water-based adhesive composition comprising 30-60% chloroprene modified acrylic emulsion and 0.05-0.45% xanthan gum or konjac gum, dissolved in water to create a stable and homogeneous solution with viscosity adapted for industrial application, providing both high strength and fast bonding properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If water-based adhesive compositions are used for bonding cellulose based substrates, then excellent penetration into paper and high strength bond are achieved, but fast setting speed is insufficient for high-speed continuous processes
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific additives (polyvinyl alcohol, carboxymethyl cellulose, or starch) in controlled amounts (0.1-5% by weight) to change the setting kinetics while preserving bond strength. This allows the adhesive to set faster without sacrificing the high strength bond characteristic of water-based adhesives.
Solution Approach 2:
The invention creates a composite adhesive system by combining the base water-based adhesive composition with specific functional additives (polyvinyl alcohol, carboxymethyl cellulose, or starch). This composite formulation achieves both fast setting speed and high bond strength by leveraging the complementary properties of the constituent materials.
2Reliability
If adhesive compositions are applied to substrates coated with UV primer, then bonding of glossy papers is achieved, but water penetration is difficult due to high coating density
Solution Approach 1:
The patent introduces specific additives (polyvinyl alcohol, carboxymethyl cellulose, or starch) as intermediary substances that facilitate water penetration through the UV primer coating. These additives modify the adhesive's interaction with the coated substrate, enabling effective bonding despite the high coating density that normally resists water penetration.
3Ease of manufacture
If viscosity is increased for proper application, then rheological properties are improved, but fast bonding capability is reduced
Solution Approach 1:
The patent optimizes the viscosity parameter by incorporating specific additives in controlled concentrations. These additives modify the rheological properties to ensure proper application characteristics while simultaneously enhancing fast bonding capability, resolving the trade-off between viscosity and bonding speed.
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 stable and strong adhesive joint with good wet tack properties, suitable for cellulose-based substrates and non-cellulose based substrates, maintaining bond integrity under accelerated storage conditions.
Implementation Method 1
from 0.05 % to 0.45 % by weight (expressed as dry content) of a water soluble polymer (B) selected among xanthan gum and konjac gum
Implementation Method 2
The present invention relates to a new water-based adhesive composition and to its use for the bonding of at least one cellulose based substrate
Data Source
AI summary
Water-based adhesive composition comprising : - from 30 % to 60 % by weight (expressed as dry content) of a chloroprene modified acrylic emulsion (A) ; and - from 0.05 % to 0.45 % by weight (expressed as dry content) of a water soluble polymer (B) selected among xanthan gum and konjac gum ; said composition being obtainable by a process (P) comprising a first step (i) of dissolving into water polymer (B) in the form of a powdered solid. Use of said composition, for the bonding of at least one cellulose based substrate.