Poly(ethylene-co-acrylic acid) and Polydiorganosiloxane Copolymers for Pavement Markings
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Solution Overview
Problem
Current copolymers of poly(ethylene-co-acrylic acid) and polydiorganosiloxanes lack effective adhesion and durability for use in pavement marking compositions, particularly in high-traffic environments, and do not provide sufficient resistance to water and dirt.
Innovation Solution
A copolymer comprising a combination of poly(ethylene-co-acrylic acid) and polydiorganosiloxane segments, where the acrylic acid units are covalently bound to the polydiorganosiloxane segments through ester or amide bonds, forming a reaction product that enhances adhesion and durability, and can be incorporated into pavement marking compositions to improve contact angle with water and resistance to solvents and dirt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If poly(ethylene-co-acrylic acid) is used as an adhesive in pavement marking compositions, then adhesion to pavement surfaces is improved, but durability and resistance to water and dirt are insufficient
Solution Approach 1:
The patent creates a copolymer composite material combining poly(ethylene-co-acrylic acid) segments with polydiorganosiloxane segments. The EAA segments provide adhesion to pavement surfaces while the polydiorganosiloxane segments contribute durability, water resistance, and dirt resistance. This composite structure resolves the contradiction by integrating the strengths of both polymer systems into a single material that simultaneously achieves both adhesion and durability.
2Strength
If poly(ethylene-co-acrylic acid) is used to provide adhesion, then bonding to various surfaces is improved, but resistance to water and dirt is insufficient
Solution Approach 1:
The copolymer composite integrates polydiorganosiloxane segments known for their hydrophobic properties and dirt resistance with poly(ethylene-co-acrylic acid) segments that provide adhesion. The siloxane portions create a water-repellent surface while maintaining the adhesive functionality of the EAA segments, thereby simultaneously achieving both adhesion and resistance to water and dirt.
Solution Approach 2:
The copolymer structure creates local regions with different properties: EAA segments localized for adhesion functions and polydiorganosiloxane segments localized for water and dirt resistance. This spatial differentiation of functional regions within the single copolymer molecule allows simultaneous optimization of both adhesion and resistance to harmful factors.
3Strength
If current copolymer formulations are used in high-traffic environments, then initial adhesion is achieved, but performance degradation occurs over time
Solution Approach 1:
The copolymer composite material combines the initial adhesion capabilities of poly(ethylene-co-acrylic acid) with the long-term durability and stability of polydiorganosiloxane. The siloxane segments provide structural stability and resistance to environmental degradation, enabling the pavement marking to maintain its performance in high-traffic environments over extended periods without significant degradation.
Solution Approach 2:
The polydiorganosiloxane segments in the copolymer act as a protective cushion against environmental stressors and mechanical wear before damage can occur to the adhesive bonds. This preemptive protection allows the pavement marking to withstand high-traffic conditions and maintain performance over time.
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 copolymer significantly increases the contact angle with water and provides enhanced adhesion and durability, maintaining performance in high-traffic conditions without significant color or brightness changes over time, while also being resistant to solvents and dirt.
Implementation Method 1
the acrylic acid units are covalently bound to the polydiorganosiloxane segments through ester or amide bonds
Implementation Method 2
the acrylic acid units are covalently bound to the polydiorganosiloxane segments through ester or amide bonds
Implementation Method 3
the acrylic acid units are covalently bound to the polydiorganosiloxane segments through ester or amide bonds
Implementation Method 4
The copolymer can be used in a variety of compositions and articles, including pavement marking compositions, and can exhibit a variety of unexpected advantages, such as increased contact angle with water
Data Source
AI summary
Copolymers of poly(ethylene-co-acrylic acid) and polydiorganosiloxanes, compositions comprising the same, and articles comprising the copolymers, compositions, or both.