Crystalline Polyesterpolyol Composition for Ambient-Temperature Adhesives
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Solution Overview
Problem
Crystalline polyesterpolyols in the prior art have high melting points, limiting their use to high-temperature applications like hot melt adhesives, making them unsuitable for temperature-sensitive materials or processes.
Innovation Solution
A polyesterpolyol is produced from a reaction mixture of a diol with primary and secondary hydroxy groups and a saturated aliphatic dicarboxylic acid with a carbon chain of at least 12 carbon atoms, resulting in a crystalline polyesterpolyol with a low melting point suitable for ambient temperature applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If crystalline polyesterpolyols are used to improve strength and elongation, then the mechanical properties are improved, but the melting point becomes too high for ambient temperature applications
Solution Approach 1:
The patent changes the chemical parameters of the polyesterpolyol by using specific diols with primary and secondary hydroxy groups combined with saturated aliphatic dicarboxylic acids having at least 12 carbon atoms. This parameter change in molecular structure enables the material to maintain crystalline morphology while achieving a melting point suitable for ambient temperature applications, thus resolving the contradiction between mechanical strength and applicable temperature range
Solution Approach 2:
The patent creates a composite molecular structure within the polyesterpolyol by combining specific diol components (with both primary and secondary hydroxy groups) and saturated aliphatic dicarboxylic acid components (with at least 12 carbon atoms). This composite approach at the molecular level enables simultaneous achievement of crystalline structure for strength and low melting point for ambient temperature usability
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 inventive polyesterpolyol maintains crystalline morphology at ambient temperatures, enabling its use in liquid systems such as polyurethane adhesives without the need for heating, providing improved strength and elongation.
Implementation Method 1
polyesterpolyol which is obtained from a reaction mixture comprising a) at least one diol with at least one primary hydroxy group and at least one secondary hydroxy group; and b) at least one saturated aliphatic dicarboxylic acid having a carbon chain of at least 12 carbon atoms
Data Source
AI summary
The present invention refers to a polyesterpolyol which is obtained by reaction of at least one diol with at least one primary hydroxy group and at least one secondary hydroxy group with a saturated aliphatic dicarboxylic acid comprising a carbon chain of at least 12 carbon atoms. The invention further relates to an adhesive composition containing the polyesterpolyol, in particular a polyurethane adhesive composition.