Ethylene Alpha-Olefin Block Copolymer Adhesive Composition
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Solution Overview
Problem
Current adhesive compositions, including hot melt adhesives and pressure sensitive adhesives, lack improved properties such as enhanced adhesion, temperature stability, and processing ease, particularly in applications requiring specific adhesion levels and thermal resistance.
Innovation Solution
An adhesive composition comprising 10-40 wt% ethylene/α-olefin block copolymer with specific molecular weight, melting point, and density relationships, combined with 30-70 wt% tackifier and 10-30 wt% plasticizing oil or low molecular weight polymer, applied at temperatures between 100°C to 150°C, utilizing spiral spray or slot die coating methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional adhesive compositions are used, then basic adhesion is achieved, but temperature stability and adhesion performance are insufficient
Solution Approach 1:
The patent uses composite materials by combining ethylene/α-olefin interpolymer with specific additives (wax, plasticizer, filler) to create an adhesive composition that achieves both temperature stability and adhesion performance. The interpolymer provides the base adhesive properties while the additives enhance thermal resistance and bonding strength synergistically.
Solution Approach 2:
The patent applies parameter changes by specifying precise ranges for molecular weight (10,000-1,000,000), comonomer content (5-30 mol%), and additive ratios. By optimizing these parameters, the adhesive maintains stable performance across a broad temperature range while achieving high adhesion strength.
2Strength
If high adhesion strength is achieved through conventional formulations, then bonding capability is improved, but processing ease and application flexibility deteriorate
Solution Approach 1:
The patent changes the rheological parameters of the adhesive by controlling the molecular weight and comonomer content of the interpolymer, and by adding plasticizers and waxes in specific ratios. This allows the adhesive to maintain high bonding strength while achieving suitable viscosity and flow characteristics for easy processing and application.
Solution Approach 2:
The composite formulation combines the interpolymer with processing aids (plasticizers, waxes) that improve flow and application properties without compromising adhesion strength. The synergistic interaction between components enables both high performance and ease of processing.
3Temperature
If broad temperature range performance is achieved, then thermal stability is improved, but molecular structure complexity increases
Solution Approach 1:
The patent achieves broad temperature range performance by optimizing key parameters of the interpolymer (molecular weight, comonomer type and content) rather than creating complex molecular architectures. The simplified approach using controlled parameter variations within the ethylene/α-olefin system achieves thermal stability without excessive structural complexity.
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 exhibits improved adhesion, elastic recovery, and thermal stability, with a unique molecular structure that maintains adhesion and flexibility across a broad temperature range, suitable for various applications including hot melt adhesives, pressure sensitive adhesives, and thermoplastic marking compositions.
Implementation Method 1
has an elastic recovery (measured using ASTM D1708), Re, in percent at 300 percent strain and 1 cycle
Implementation Method 2
Hot-melt adhesives at ambient temperature are generally solid materials that can be heated to a melt to hold adherents or substrates together upon cooling and solidifying
Implementation Method 3
have at least one melting point, Tm, in °C
Data Source
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AI summary
An adhesive composition comprises: (i) at least one ethylene/a-olefin interpolymer, (ii) at least one tackifier; and (iii) an oil or a low molecular weight polymer. Preferably, the ethylene/a-olefin interpolymer has a Mw/Mn from about 1.7 to about 3.5, at least one melting point, Tm, in degrees Celsius, and a density, d, in grams/cubic centimeter, wherein the numerical values of Tm and d correspond to the relationship: Tm = 858.91 - 1825.3(d) + 1112.8(d)2. The composition can be used in hot melt adhesives, pressure sensitive adhesives, hot melt pressure sensitive adhesives and thermoplastic marking paints.