Dicyclopentadiene-Based Resin Copolymerization for Adhesive Compatibility
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Solution Overview
Problem
Dicyclopentadiene hydrogenated resins face challenges in achieving balanced initial tackiness strength, 180° peel strength, and cohesiveness while maintaining compatibility with various base resins, particularly with styrene-butadiene-styrene copolymers, due to structural limitations and high melt viscosity issues.
Innovation Solution
Copolymerizing dicyclopentadiene with a vinylamide-based monomer to create a resin composition that includes a dicyclopentadiene-based monomer and a vinylamide-based monomer at specific weight ratios, followed by hydrogenation, which enhances compatibility and adhesive strength with various base resins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the content of dicyclopentadiene monomer is increased to improve resin performance, then the melt viscosity of the final resin increases and compatibility with base resin decreases, but if C9-based or C5-based monomers are used to adjust polarity, then excessive monomer content is required and selective hydrogenation technology is needed making production difficult
Solution Approach 1:
The patent changes the chemical structure parameter of the monomer by introducing a vinylamide group with specific molecular weight and polarity characteristics. This parameter change allows the resin to achieve compatibility with various base resins including styrene-butadiene-styrene copolymers without requiring excessive monomer content or complex selective hydrogenation processes, thus resolving the contradiction between compatibility and ease of manufacture
Solution Approach 2:
The patent creates a composite monomer structure by combining dicyclopentadiene with vinylamide groups to form a copolymer. This composite structure integrates the advantages of both components: the dicyclopentadiene provides resin performance while the vinylamide group provides polarity adjustment and compatibility, eliminating the need for excessive monomer blending and complex production processes
2Adaptability or versatility
If conventional C9-based or C5-based monomers are used to adjust polarity degree, then compatibility with some base resins improves, but initial tackiness strength becomes relatively poor
Solution Approach 1:
The patent optimizes the molecular weight parameter of the vinylamide-based monomer to be 99-154 g/mol, which is specifically designed to balance polarity adjustment with tackiness generation. This parameter optimization ensures that the resin achieves good compatibility with base resins while maintaining excellent initial tackiness strength, resolving the contradiction between compatibility and tackiness
3Strength
If dicyclopentadiene hydrogenated resin is used to achieve good cohesiveness and 180° peel strength, then compatibility with styrenic-isoprene-styrene copolymer improves, but compatibility with styrenic-butadiene-styrene copolymer becomes poor
Solution Approach 1:
The patent designs the vinylamide-based monomer to provide multi-functional properties: it adjusts polarity for compatibility with various base resins including styrenic-butadiene-styrene copolymers, maintains cohesiveness and peel strength through proper molecular weight, and enables broad applicability across different adhesive systems. This universal design resolves the contradiction between strength and adaptability
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 dicyclopentadiene-based resin composition exhibits improved compatibility and adhesive strength, including enhanced 180° peel strength and tack force, across a range of base resins, including styrene-butadiene-styrene block copolymers, while maintaining a low molecular weight distribution and preventing surface contamination.
Implementation Method 1
a dicyclopentadiene-based resin is prepared by copolymerizing a monomer composition including a dicyclopentadiene-based monomer and a vinylamide-based monomer
Implementation Method 2
a dicyclopentadiene-based hydrogenated resin is prepared by hydrogenating the dicyclopentadiene-based resin
Data Source
AI summary
The present invention relates to: a dicyclopentadiene-based resin having excellent compatibility with a base resin and prepared by being copolymerized with a monomer composition comprising a dicyclopentadiene-based monomer and a vinylamide-based monomer; a dicyclopentadiene-based hydrogenated resin; and an adhesive resin composition comprising same. A dicyclopentadiene-based resin according to the present invention is advantageous in terms of having excellent compatibility with various base resins and being providable as an adhesive resin composition capable of achieving remarkably improved adhesive strength.