Polycarbonate Diol Terminal Hydroxyl Control
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Solution Overview
Problem
Conventional polycarbonate diols fail to produce polyurethanes and thermoplastic elastomers with superior strength, elongation, impact resilience, and chemical resistances, including oleic acid and chlorine resistance.
Innovation Solution
A polycarbonate diol with specific repeating units and terminal hydroxyl group compositions, characterized by a high primary terminal OH ratio and controlled molecular weight, is developed to enhance the strength, elongation, and chemical resistances of polyurethanes and thermoplastic elastomers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polycarbonate diol using 1,6-hexanediol as a raw material is used, then hydrolysis resistance, light resistance, oxidative degradation resistance, and heat resistance are improved, but flexibility and elastic recovery deteriorate due to crystallinity
Solution Approach 1:
The patent uses an aliphatic copolycarbonate diol composed of multiple diol components (1,4-butanediol, 1,6-hexanediol, and other aliphatic diols) to create a composite material that combines the crystallinity and chemical resistance of 1,6-hexanediol with the flexibility and non-crystalline structure of other aliphatic diols, thereby achieving both chemical resistance and flexibility simultaneously
2Reliability
If an aliphatic copolycarbonate diol using 1,4-butanediol is used, then chemical resistances including oleic acid resistance and chlorine resistance are improved, but the reactivity with compounds having functional groups reactive with hydroxyl groups deteriorates
Solution Approach 1:
The patent modifies the molecular structure parameters of the copolycarbonate diol by controlling the ratio and type of diol components, adjusting the average molecular weight, and controlling the terminal hydroxyl group composition to optimize both chemical resistance and reactivity parameters simultaneously
3Ease of manufacture
If the polymer terminal hydroxyl group composition is not controlled, then manufacturing simplicity is maintained, but the reactivity and resulting polyurethane quality deteriorate
Solution Approach 1:
The patent incorporates terminal hydroxyl group control into the polymerization process itself by using specific diol raw materials and reaction conditions that inherently produce the desired terminal group composition, eliminating the need for separate post-processing steps to achieve proper terminal functionality
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 polycarbonate diol achieves polyurethanes and thermoplastic elastomers with improved strength, elongation, impact resilience, and chemical resistances, optimizing the balance between flexibility and chemical resistance.
Implementation Method 1
the polycarbonate diol is reacted with a compound having a functional group reactive with a hydroxyl group, such as an isocyanate
Data Source
AI summary
A polycarbonate diol comprising repeating units represented by the following formula (A) and a terminal hydroxy group, 60-100 mol % of the repeating units represented by the formula (A) being repeating units represented by the following formula (B) or (C). The amount of the repeating units represented by the formula (B) is 60-100 mol % based on the total amount of the repeating units represented by the formula (A). The polycarbonate diol has a terminal primary OH ratio of 95% or higher. (A) (In the formula, R represents a C2-12 divalent aliphatic or alicyclic hydrocarbon.)