Non-Chlorinated Polyolefin Adhesion Promoter for Fuel-Resistant Coatings
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Solution Overview
Problem
Existing adhesion promoting compositions for polymeric substrates face challenges in achieving strong and durable adhesion while providing adequate fuel resistance, often requiring high levels of chlorinated polyolefins which have processing limitations and result in high VOC emissions, and either offer good adhesion with poor fuel resistance or vice versa, limited to specific substrate types.
Innovation Solution
A film-forming composition comprising a non-chlorinated, linear polyolefin polymer with ethylenically unsaturated anhydride residues, an aminoplast, and a non-chlorinated hydrocarbon or alkyd resin, applied in multiple layers to enhance adhesion and fuel resistance on polymeric substrates, allowing for curing to improve coating strength and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If chlorinated polyolefins are used in adhesion promoter layers, then adhesion to polymeric substrates is improved, but fuel resistance deteriorates and VOC emissions increase
Solution Approach 1:
The patent changes the chemical composition parameters by replacing chlorinated polyolefins with non-chlorinated polyolefin diols and saturated polyhydroxylated polydiene polymers. This parameter change maintains adhesion functionality while eliminating the harmful chlorinated content that caused poor fuel resistance and high VOC emissions, thereby resolving the contradiction between adhesion strength and fuel resistance
Solution Approach 2:
The patent uses composite material systems combining non-chlorinated polyolefin diols with saturated polyhydroxylated polydiene polymers and curing agents. This composite approach creates a multi-functional coating that achieves both strong adhesion to polymeric substrates and excellent fuel resistance, overcoming the limitations of single-component chlorinated systems
2Strength
If high molecular weight chlorinated polyolefins are used, then coating strength is improved, but processing becomes more difficult and VOC emissions increase
Solution Approach 1:
The patent changes the molecular weight and chemical structure parameters by using non-chlorinated polyolefin diols and saturated polyhydroxylated polydiene polymers with optimized molecular weights. These parameter changes maintain adequate coating strength while improving processability and reducing VOC emissions, resolving the contradiction between coating strength and ease of manufacture
3Strength
If adhesion promoter compositions are designed for good adhesion, then coating adhesion is improved, but fuel resistance deteriorates
Solution Approach 1:
The patent develops composite material systems combining non-chlorinated polyolefin diols with saturated polyhydroxylated polydiene polymers and specific curing agents. This composite formulation achieves synergistic effects that provide both strong adhesion to polymeric substrates and excellent fuel resistance, resolving the contradiction between adhesion performance and fuel resistance reliability
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 composition provides improved fuel resistance and adhesion to polymeric substrates, eliminating the need for separate primers and reducing VOC emissions, while being applicable to a variety of substrate types, thus meeting the demands of automotive manufacturing.
Implementation Method 1
a non-chlorinated, linear polyolefin polymer comprising 0.5 to 10 percent by weight residues of an ethylenically unsaturated anhydride and/or acid
Implementation Method 2
subjecting the coated substrate formed in step (1) to a temperature for a time sufficient to cure the film-forming composition
Data Source
AI summary
The present invention is directed to film-forming compositions comprising: a) a non-chlorinated, linear polyolefin polymer comprising 0.5 to 10 percent by weight residues of an ethylenically unsaturated anhydride or acid; b) an aminoplast; and c) a component comprising: i) at least one non-chlorinated hydrocarbon having at least 18 carbon atoms and optionally aromatic groups and/or oxygen heteroatoms; and/or ii) an alkyd resin. The present invention is also drawn to methods of improving fuel resistance of a coated article, comprising: (1) applying the film-forming composition to a substrate to form a coated substrate; (2) optionally subjecting the coated substrate to a temperature for a time sufficient to cure the film-forming composition; (3) applying at least one curable film-forming composition to the coated substrate to form a multi-layer coated substrate; and (4) subjecting the multi-layer coated substrate to a temperature and for a time sufficient to cure all of the film-forming compositions.