Hydrogenated Copolymer Resin Composition for Adhesive Films
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Solution Overview
Problem
Hydrogenated copolymers disclosed in existing patents have poor compatibility with thermoplastic resins like polypropylene and exhibit low mechanical characteristics at low temperatures due to their loss tangent (tan δ) peaks between −10° C. and 80° C., making them unsuitable for applications requiring compatibility with polypropylene, abrasion resistance, and mechanical characteristics at low temperatures.
Innovation Solution
A resin composition comprising two hydrogenated copolymers with specific structures at a particular mass ratio, where one hydrogenated copolymer (a) has a hydrogenated polymer block (B1) with 40-80% vinyl aromatic compound content and a hydrogenated polymer block (B2) with high vinyl bond content, and the other hydrogenated copolymer (b) has a hydrogenated polymer block (B3) with 20-90% vinyl aromatic compound content, achieving favorable abrasion resistance, low-temperature mechanical characteristics, and balance among characteristics when blended with polypropylene or rubber-like polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hydrogenated copolymer is used to improve weather resistance and heat resistance, then durability is improved, but compatibility with thermoplastic resins deteriorates
Solution Approach 1:
The hydrogenated copolymer is segmented into two distinct types: (a) a block copolymer with alternating hydrogenated polymer blocks (B1, B2) containing vinyl aromatic and conjugated diene compounds, and (b) a random copolymer with hydrogenated polymer blocks (B3) containing vinyl aromatic and conjugated diene compounds. This segmentation allows each component to contribute different properties, with the block copolymer providing structural integrity and the random copolymer enhancing compatibility with thermoplastic resins.
Solution Approach 2:
The invention uses a composite structure combining two different hydrogenated copolymer types in a specific mass ratio (a/(a+b) = 0.05 to 0.50). The block copolymer (a) provides weather resistance and heat resistance, while the random copolymer (b) improves compatibility with thermoplastic resins. This composite approach resolves the contradiction by integrating materials with complementary properties.
2Reliability
If a hydrogenated copolymer is used to improve abrasion resistance, then durability is improved, but low-temperature mechanical characteristics deteriorate
Solution Approach 1:
The block copolymer structure creates local regions with different properties: hydrogenated polymer blocks (B1, B2) provide abrasion resistance through their cross-linked structure, while the alternating arrangement with vinyl aromatic and conjugated diene compounds maintains flexibility at low temperatures. The specific local composition ratios (40-80 mass% vinyl aromatic in B1, 60-100 mol% vinyl bond in B2) are optimized to balance these opposing requirements.
3Ease of manufacture
If a hydrogenated copolymer with high vinyl aromatic content is used to improve compatibility with thermoplastic resins, then processability is improved, but low-temperature mechanical characteristics deteriorate
Solution Approach 1:
Instead of using a single hydrogenated copolymer with extremely high vinyl aromatic content (which would maximize compatibility but harm low-temperature properties), the invention applies partial action by using a balanced composition where the block copolymer has moderate vinyl aromatic content (40-80 mass%) and the random copolymer has higher content (20-90 mass%). This partial approach achieves sufficient compatibility while preserving low-temperature mechanical characteristics.
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 proposed resin composition imparts excellent abrasion resistance, low-temperature mechanical characteristics, and balance among characteristics to the resin composition when mixed with thermoplastic resins or rubber-like polymers, and provides favorable initial tackiness, adhesion increasing properties, feedability, and balance among characteristics to adhesive films.
Implementation Method 1
a hydrogenated copolymer (a) prepared by hydrogenating a copolymer of a vinyl aromatic compound and a conjugated diene compound, and a hydrogenated copolymer (b) prepared by hydrogenating a copolymer of a vinyl aromatic compound and a conjugated diene compound
Data Source
AI summary
A hydrogenated copolymer containinga hydrogenated copolymer (a) prepared by hydrogenating a copolymer of a vinyl aromatic compound and a conjugated diene compound, anda hydrogenated copolymer (b) prepared by hydrogenating a copolymer of a vinyl aromatic compound and a conjugated diene compound, whereina mass ratio (a)/(b) of a content of the hydrogenated copolymer (a) to a content of the hydrogenated copolymer (b) is 5/95 to 95/5,the hydrogenated copolymer (a) has a hydrogenated polymer block (B1) and a hydrogenated polymer block (B2),the hydrogenated polymer block (B1) consists of a vinyl aromatic compound and a conjugated diene compound and has a content of the vinyl aromatic compound of 40 to 80 mass %, andthe hydrogenated polymer block (B2) mainly contains a conjugated diene compound and has a vinyl bond content of 60 to 100 mol % before hydrogenation.