Dicyclopentadiene Resin Two-Stage Polymerization Narrow Distribution
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Solution Overview
Problem
Dicyclopentadiene-based resins face challenges in achieving high compatibility, favorable color characteristics, and adhesive strength due to broad molecular weight distribution and low productivity, particularly when using aromatic comonomers like styrene, which results in high hydrogen consumption and extended reaction times.
Innovation Solution
A two-stage polymerization process is employed, where dicyclopentadiene and an aromatic olefin-based comonomer are polymerized at a weight ratio of 90:10 to 10:90, with continuous stirring in the first stage and no stirring in the second stage to inhibit crosslinking reactions, resulting in a resin with a narrow molecular weight distribution and improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal polymerization is performed with aromatic comonomers to improve compatibility and adhesive strength, then resin compatibility and adhesive strength are improved, but molecular weight distribution becomes broad and productivity decreases
Solution Approach 1:
The polymerization process is divided into two distinct stages: a first polymerization step with stirring to control initial polymer formation, and a second polymerization step without stirring to complete the reaction. This segmentation allows optimization of each stage independently, achieving both high productivity and narrow molecular weight distribution while maintaining adhesive strength through controlled aromatic comonomer incorporation.
2Quantity of substance
If reaction time is extended to increase yield with aromatic comonomers, then hydrogen consumption increases and color becomes darker, but productivity decreases
Solution Approach 1:
The two-stage polymerization process maintains continuous useful action throughout. The first stage establishes controlled polymerization with aromatic comonomer incorporation, and the second stage continuously completes the reaction without interruption. This continuous process achieves high yield and narrows molecular weight distribution while preventing excessive hydrogen consumption and color darkening that would occur with prolonged single-stage reaction.
3Object-affected harmful factors
If hydrogenation is performed to improve color characteristic, then color is improved, but hydrogen consumption increases and reaction time extends
Solution Approach 1:
The polymerization process is designed to incorporate aromatic comonomers and control molecular weight distribution during the polymerization stage itself, rather than requiring extensive post-polymerization hydrogenation. The first stage with stirring and second stage without stirring work together to establish optimal polymer structure that reduces the need for subsequent hydrogenation, thereby improving color characteristic while minimizing hydrogen consumption and reaction time.
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
This method produces dicyclopentadiene-based resins with enhanced adhesive strength, thermal stability, and a low softening point, while maintaining high compatibility and productivity, overcoming the limitations of existing methods.
Implementation Method 1
a first polymerization step of performing a polymerization process of a monomer composition including dicyclopentadiene and an aromatic olefin-based comonomer at a weight ratio of 90:10 to 10:90 under stirring; and a second polymerization step of performing a polymerization process of reaction products of the first polymerization step without stirring
Data Source
AI summary
Provided are a method of preparing a dicyclopentadiene-based resin and a dicyclopentadiene-based resin. According to the present invention, provided is a dicyclopentadiene-based resin including an aromatic olefin-based comonomer as a comonomer to have improved quality including high compatibility, a favorable color characteristic, and a low softening point, and also having improved adhesive strength due to a low molecular weight and a narrow molecular weight distribution.