Water-Based Adhesive Composition with Benzoate Ester Plasticizer
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Solution Overview
Problem
Prior art water-based adhesives suffer from instability over time, plasticizer segregation, pH instability, and reduced peel strength, making them unsuitable for long-term storage and low-temperature applications.
Innovation Solution
A water-based adhesive composition incorporating a mono-ester of benzoic acid as a plasticizer, specifically C4-C16 alcohol benzoate esters, which maintains stability, prevents plasticizer segregation, and ensures pH stability, combined with a dispersion component and optional additives, forming a two-component adhesive system that coagulates upon mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional plasticizers are used in water-based adhesives, then initial tack and flexibility are improved, but storage stability deteriorates due to plasticizer segregation
Solution Approach 1:
The patent changes the chemical parameters of the plasticizer by using benzoate esters with specific molecular structures (C10-C14 alkyl groups) instead of conventional plasticizers. This parameter change achieves both improved initial tack and enhanced storage stability by preventing segregation while maintaining flexibility.
Solution Approach 2:
The patent creates a composite adhesive system combining polychloroprene dispersion with specific benzoate ester plasticizers and pH stabilizers. This composite formulation achieves synergistic effects where the plasticizer provides flexibility and tack while the pH stabilizer maintains composition stability during storage.
2Adaptability or versatility
If plasticizer is added to adhesive composition, then flexibility and contactability are improved, but pH stability deteriorates causing reduced adhesive lifetime
Solution Approach 1:
The patent introduces a pH stabilizer as an intermediary substance that mediates between the plasticizer and the adhesive base. The pH stabilizer counteracts the acidifying effect of the plasticizer, maintaining pH stability while allowing the plasticizer to provide its flexibility-enhancing functions.
Solution Approach 2:
The patent applies beforehand cushioning by pre-formulating the adhesive with pH stabilizers before adding the plasticizer. This anticipatory measure prevents pH instability from developing during storage, cushioning against the acidifying effect of the plasticizer before it can cause damage.
3Temperature
If adhesive is formulated for low glass transition temperature, then low-temperature performance is improved, but storage stability deteriorates
Solution Approach 1:
The patent carefully selects benzoate esters with specific chain lengths (C10-C14) that provide the desired glass transition temperature reduction for low-temperature performance while maintaining adequate storage stability. The parameter optimization balances these two competing requirements.
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 composition exhibits improved stability, enhanced peel strength, and a lower glass transition temperature, allowing for better performance at low temperatures and extended storage, while maintaining compatibility with polychloroprene dispersions.
Implementation Method 1
no segregation of the plasticizer
Implementation Method 2
a better pH stability
Implementation Method 3
an improved peel strength
Data Source
AI summary
The present invention is in the field of an improved adhesive composition, use of said composition and products comprising said composition. The adhesive composition may be a one component and a two component adhesive, each component typically comprising various ingredients. The present adhesives are water-based dispersions.