Semi-crystalline Polyester Polyols for Low Enthalpy Adhesives
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Solution Overview
Problem
Existing polyester polyols for adhesives and thermoplastics face challenges in achieving a balance between low melting enthalpy and high mechanical stability, often compromising elasticity and cohesive strength.
Innovation Solution
A semi-crystalline mixture of polyester polyols is developed through polycondensation of saturated aliphatic dicarboxylic acids with an even number of methylene groups and aliphatic diols containing ether functions, which recrystallizes upon melting, allowing for a low melting enthalpy range of -30 to 60°C and enhanced mechanical stability and elasticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If polyester polyols with low melting enthalpy are used, then energy efficiency in adhesive manufacturing is improved, but mechanical stability and breaking resistance deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the polyester polyols by selecting specific dicarboxylic acids with at least 8 methylene groups and diols with ether functions, creating a specific molecular structure that enables both low melting enthalpy and high mechanical stability through controlled semi-crystallinity and recrystallization behavior
Solution Approach 2:
The patent creates a composite polyester polyol system combining specific dicarboxylic acid components and diol components with ether functions, forming a semi-crystalline mixture that exhibits both low melting enthalpy and high mechanical stability through the synergistic interaction of its composite structure
2Strength
If polyester polyols with high mechanical stability are used, then adhesive bond strength is improved, but elasticity deteriorates
Solution Approach 1:
The patent adjusts the structural parameters of the polyester polyols by selecting dicarboxylic acids with specific chain lengths (at least 8 methylene groups) and diols with ether functions, creating a molecular architecture that provides both mechanical stability and elasticity through controlled crystallinity and chain flexibility
3Ease of operation
If melting temperature is lowered to improve ease of operation, then application flexibility is improved, but mechanical stability below softening point deteriorates
Solution Approach 1:
The patent changes the thermal parameters of the polyester polyols by selecting dicarboxylic acids with at least 8 methylene groups and diols with ether functions, achieving a specific melting temperature range through controlled semi-crystallinity that maintains mechanical stability while enabling easy processing
Solution Approach 2:
The patent creates a dynamic thermal behavior in the polyester polyols through semi-crystalline structure with recrystallization upon melting, allowing the material to transition between soft and stable states depending on temperature, thus providing both ease of operation and mechanical stability
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 resulting materials exhibit excellent mechanical stability and elasticity, making them suitable for thermoplastic applications, adhesives, and sealants, with adjustable melting temperatures and improved cohesive properties.
Implementation Method 1
A semi-crystalline mixture of polyester polyols which recrystallises upon melting
Implementation Method 2
the melting temperature can be adjusted in a range from −30 to 60° C.
Implementation Method 3
which can be obtained by polycondensing a reaction mixture comprising one or more dicarboxylic acids with one or more diols
Data Source
AI summary
The present invention relates to a semi-crystalline mixture of polyester polyols which recrystallises upon melting and which can be obtained by polycondensing a reaction mixture comprising one or more dicarboxylic acids selected from saturated aliphatic dicarboxylic acids having an even number of at least 8 methylene groups, and one or more diols selected from aliphatic diols which have at least one ether function. The invention also relates to a polymeric material which is obtained from the chemical modification of the mixture of polyester polyols with organic compounds which contain at least one isocyonate group and/or epoxide group. The mixtures and materials according to the invention are characterised by relatively low melting enthalpies, while the melting temperature can be set in a range of −30 to 60° C., meaning that it is possible to obtain easily fusible formulations containing the mixtures and materials according to the invention. The mixtures and materials according to the invention also provide such formulations with a high elasticity and breaking resistance. The present invention therefore includes the use of the polyester polyols and polymeric materials according to the invention as deforming, fusing, and extrusion means in thermoplastic materials, and the use thereof for producing adhesives and sealants, in particular hot-melt adhesives and reactive adhesives.