Primer Composition for Bonding Polar Textiles to Polyolefins
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Solution Overview
Problem
Conventional methods for improving the adhesion and printability of polyolefins, such as blending with polar polymers and surface treatments, are inefficient and require complex processing, and existing adhesives do not provide sufficient adhesion with polyethylene- or polypropylene-containing polyolefins.
Innovation Solution
A primer composition comprising a functionalized styrenic block copolymer, a functionalized polyolefin, a hydrocarbon solvent, and an isocyanate component, which can be easily processed and applied at room temperature, improving adhesion with polyolefins and other substrates while providing balanced adhesion, processability, and flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional surface treatments (plasma, corona, flame) are used to improve adhesion of polyolefins, then adhesion is improved, but processing time is lengthened and processing complexity increases
Solution Approach 1:
The invention changes the chemical parameters of the polyolefin surface by introducing polar functional groups through reaction with maleic anhydride or carboxylic acids, transforming the low-surface-energy polyolefin into a high-adhesion surface without requiring complex physical treatment equipment
Solution Approach 2:
The patent uses polar polymers (polyester, polyamide, acrylic) as intermediary materials that are blended with polyolefin to create a dual-phase adhesive layer, where the polar polymer component mediates bonding between the polyolefin and polar substrates, eliminating the need for complex surface treatment processes
2Strength
If functionalized polyolefin adhesives are used to improve adhesion with polyethylene- or polypropylene-containing polyolefins, then adhesion is improved, but the adhesive composition becomes more complex and requires organic solvents
Solution Approach 1:
The invention creates a composite adhesive system combining functionalized polyolefin (providing compatibility with non-polar substrates) and polar polymer (providing adhesion to polar substrates), where each component contributes specific properties to achieve balanced adhesion without requiring complex formulation
Solution Approach 2:
The adhesive composition is designed to perform multiple functions simultaneously: it bonds to both polar and non-polar substrates, provides flexibility, and maintains processability at room temperature, reducing the need for multiple specialized adhesive products
3Ease of operation
If styrenic block copolymers are used as primers for rubbers, then processability is improved, but adhesion with polyethylene- or polypropylene-containing polyolefins is insufficient
Solution Approach 1:
The styrenic block copolymer is selectively functionalized at specific locations (the polyolefin-compatible blocks) with polar groups, creating local polar zones that enhance adhesion while maintaining the overall elastomeric properties and processability of the copolymer
4Ease of manufacture
If room temperature processing is used to improve ease of manufacture, then adhesion properties may be adversely affected, but the invention achieves both room temperature processing and maintained adhesion
Solution Approach 1:
The invention changes the physical parameters of the adhesive system by using room temperature curing chemistry (isocyanate-based crosslinking) that maintains adhesion chemistry effectiveness without requiring thermal activation, thus preserving both ease of manufacture and adhesive properties
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 primer composition enhances the peel strength between substrates and polyolefin layers, offering improved adhesion, processability, and flexibility, even with difficult-to-bond substrates, and can be used in various applications including synthetic leather and technical textiles.
Implementation Method 1
The isocyanate component reacts with hydroxyl groups, carboxylic acid groups, or water to form crosslinked structures or release carbon dioxide, thereby curing the adhesive or primer composition at room temperature.
Implementation Method 2
The primer composition enhances the peel strength between substrates and polyolefin layers, offering improved adhesion, processability, and flexibility
Implementation Method 3
a functionalized styrenic block copolymer containing greater than or equal to 20 wt % polymerized styrene, a functionalized polyolefin
Data Source
AI summary
The present disclosure provides a primer composition. In an embodiment, the primer composition includes a functionalized polyolefin, a functionalized styrenic block copolymer containing greater than or equal to 20 wt % polymerized styrene, a solvent composition and an isocyanate component. The primer composition is suitable for use as an adhesive layer between a substrate and a polyolefin layer.