Multi-Block Copolymer Adhesive Composition for Hot-Melt Processing
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Solution Overview
Problem
Existing adhesive compositions based on styrene-based block copolymers face limitations in achieving optimal processability and adhesive properties simultaneously, with prior art compositions exhibiting poor processing and adhesive performance.
Innovation Solution
A block copolymer composition represented by Formula 1, comprising a triblock (A-B-A′) and a diblock (B′-A′) structure, combined with a hydrocarbon adhesive resin and a plasticizer, where the weight average molecular weight of the diblock is smaller than the triblock, and the molecular weight distribution is between 1.1 and 2.0, allowing for improved processability and adhesive properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional linear triblock copolymer SBS is used, then holding power is high, but processing properties and adhesive properties are poor
Solution Approach 1:
The patent segments the traditional linear triblock copolymer structure into a multi-block architecture with alternating soft and hard blocks. This segmentation creates a more complex molecular structure that balances processing properties and adhesive properties while maintaining holding power, resolving the contradiction between high holding power and poor processing properties.
2Ease of operation
If SBS with tapered blocks is used, then processability and adhesive properties are improved, but polymerization time is long and industrial application is difficult
Solution Approach 1:
The patent changes the polymerization parameters and molecular architecture from traditional linear to multi-block structure. This parameter change enables improved processability and adhesive properties while reducing polymerization time to 2-4 hours, making industrial application feasible by optimizing the balance between structure complexity and processing efficiency.
3Strength
If block copolymer with complex multi-block structure is used, then adhesive properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent creates a composite molecular structure combining multiple block types (soft blocks and hard blocks) in a multi-block architecture. This composite structure delivers superior adhesive properties by integrating the benefits of different block compositions while maintaining a systematic approach to manufacturing through controlled polymerization processes.
Data Source
AI summary
The present invention relates to an adhesive composition comprising a mixture of multi-block copolymers, in particular, an adhesive composition comprising a block copolymer represented by Formula 1, a hydrocarbon adhesive resin and a plasticizer. The adhesive composition according to the present invention can be easily processed due to its low melting point and shows improved adhesive properties such as loop tack, 180° peel strength and holding power.