Aliphatically Modified Rosin Resin for Metallocene Polyolefin Adhesives
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Solution Overview
Problem
Current tackifying resins, such as rosin ester tackifiers, are not compatible with metallocene catalyzed polyolefins and other aliphatic base polymers, leading to opacity, phase separation, and reduced adhesion properties in hot melt adhesives, while hydrogenated hydrocarbon tackifiers offer limited adhesion and formulation flexibility.
Innovation Solution
An aliphatically modified rosin resin is produced by esterifying rosin with a polyol and reacting the rosin polyol ester with monomers like alpha-olefins, vinyl-terminated monomers, or unsaturated esters, resulting in a resin that is compatible with metallocene catalyzed polyolefins and other aliphatic base polymers, with improved adhesion and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If rosin ester tackifiers are used in metallocene catalyzed polyolefin adhesives, then adhesion properties are improved, but compatibility is worsened (opacity and phase separation occur)
Solution Approach 1:
The patent applies parameter changes by modifying the chemical structure of rosin ester tackifiers through aliphatic chain extension and esterification with polyols. These structural modifications change the polarity and molecular weight parameters of the tackifier, enabling compatibility with non-polar metallocene polyolefins while preserving adhesion properties.
Solution Approach 2:
The invention creates composite tackifier systems by combining modified rosin esters with aliphatic hydrocarbons and polyols. This composite approach allows the formulation to achieve both compatibility with metallocene polymers and robust adhesion characteristics that neither component could provide alone.
2Stability of the object's composition
If hydrogenated hydrocarbon tackifiers are used instead of rosin esters, then compatibility is improved, but adhesion properties are worsened
Solution Approach 1:
The patent uses polyol esterified rosin esters as intermediary substances that bridge the compatibility gap. These modified tackifiers serve as mediators between the polar rosin structure and non-polar metallocene polymers, enabling both compatibility and adhesion through their dual-character molecular structure.
3Strength
If rosin ester tackifiers are heated above 230°C, then adhesion is improved through disproportionation reactions, but compatibility is worsened due to increased polarity from dehydroabietic isomers
Solution Approach 1:
The patent applies preliminary action by pre-modifying the rosin ester structure through polyol esterification and aliphatic chain extension before the adhesive formulation is created. This preliminary structural modification prevents the formation of highly polar dehydroabietic isomers during subsequent heating, thereby maintaining compatibility while still enabling adhesion development.
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 aliphatically modified rosin resin provides enhanced compatibility, lower melt viscosities, higher specific adhesion, and better heat resistance, overcoming the limitations of existing tackifiers with metallocene catalyzed polyolefins, and achieving stable, clear adhesive compositions.
Implementation Method 1
esterifying rosin by reaction with a polyol to produce a rosin polyol ester
Implementation Method 2
reacting the rosin polyol ester with a monomer material to produce the aliphatically modified rosin resin
Data Source
AI summary
Aliphatically modified rosin resins are prepared by reacting rosin esters with aliphatic monomers. These aliphatically modified rosin resins are compatible with metallocene catalyzed polyolefins and other aliphatic base polymers and are used as tackifiers in combination with metallocene catalyzed polyolefins and other aliphatic base polymers to form adhesive compositions for hot melt and pressure sensitive applications.