Polyurethane Adhesive Block Copolymer Low Energy Substrate Bonding
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Solution Overview
Problem
Traditional polyurethane adhesive compositions do not adhere well to low energy substrates, often requiring surface treatment or the use of additional low energy polymers, which can diminish adhesive properties.
Innovation Solution
Incorporating a block copolymer with at least two homopolymer subunits, such as polyolefins and fluoropolymers, into the polyurethane adhesive compositions to enhance adhesion to low energy substrates without the need for surface treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional polyurethane adhesive compositions are used, then the adhesive composition is simple and easy to manufacture, but the adhesion to low energy substrates is poor
Solution Approach 1:
The patent applies composite materials by combining polyurethane adhesive composition with block copolymer additives (polyolefin block copolymer and/or fluorinated block copolymer) to create a composite adhesive system. This combination provides both the bonding capabilities of polyurethane and the low surface energy characteristics of polyolefin/fluoropolymer blocks, enabling adhesion to low energy substrates without requiring surface treatment or additional primers.
2Reliability
If additional low energy polymers are added to improve adhesion to low energy substrates, then the adhesion improves, but the adhesive properties are diminished
Solution Approach 1:
The patent applies local quality by incorporating block copolymer additives with specific low surface energy characteristics (polyolefin and fluorinated blocks) into the polyurethane adhesive matrix. These block copolymer segments locally modify the adhesive properties at the substrate interface, providing enhanced adhesion to low energy substrates while the bulk polyurethane matrix maintains its structural and bonding properties.
Solution Approach 2:
The patent applies parameter changes by modifying the surface energy parameters of the adhesive composition through the addition of block copolymer additives. The polyolefin block copolymer (with surface energy of 30-40 mN/m) and fluorinated block copolymer (with surface energy of 20-30 mN/m) change the overall surface energy parameter of the adhesive, enabling it to bond to low energy substrates while maintaining adhesive performance.
3Reliability
If surface treatment is used to improve adhesion to low energy substrates, then the adhesion improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies self-service by formulating the adhesive composition itself with block copolymer additives that provide low surface energy characteristics. This allows the adhesive to self-adhere to low energy substrates without requiring external surface treatment processes such as plasma treatment, flame treatment, or chemical etching. The adhesive composition essentially serves its own adhesion enhancement function.
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 compositions exhibit superior adhesion to low energy substrates, outperforming traditional polyurethane adhesives by improving bonding strength and reducing the requirement for additional polymers, thus maintaining adhesive properties.
Implementation Method 1
compositions comprising a polyurethane and a block copolymer with at least two homopolymer subunits... improving adhesion onto low energy substrates
Implementation Method 2
the block copolymer comprises at least two homopolymer subunits selected from the group consisting of polyolefins and fluoropolymers... superior adhesion to low energy substrates
Data Source
AI summary
The present invention encompasses compositions comprising a polyurethane and a block copolymer with at least two homopolymer subunits. In one aspect, compositions of the present disclosure are coating compositions. In another aspect, compositions of the present disclosure are adhesive compositions.