Chlorine-Free Adhesion Promoter for Polyolefin Substrates
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Solution Overview
Problem
Current adhesion promoter systems for low surface energy plastic substrates, such as thermoplastic polyolefins, fail to provide adequate water jet resistance and chemical resistance, especially without surface activation treatment, and often contain chlorine, which is undesirable.
Innovation Solution
An aqueous dispersion-based adhesion promoter system comprising at least 60% by weight of amine and/or hydroxyl functionalized polyolefin, prepared via in-situ melt reaction, with optional second functionalized polyolefins having succinic anhydride substitutions, and a stabilizing agent, forming a dispersion with specific particle size and pH ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If waterborne adhesion promoter systems are used, then environmental friendliness is improved, but water jet resistance and chemical resistance deteriorate
Solution Approach 1:
The invention uses a composite adhesion promoter system combining multiple functionalized polyolefins (amine-functionalized polyolefin, hydroxyl-functionalized polyolefin, and succinic anhydride-functionalized polyolefin) in specific weight ratios to achieve both environmental friendliness and improved water/chemical resistance. This composite approach allows the system to maintain biodegradability while providing adequate adhesion performance on polyolefin substrates.
Solution Approach 2:
The invention optimizes the weight ratio parameters of different functionalized polyolefins (first polyolefin: 40-80%, second polyolefin: 20-60%, third polyolefin: 5-30%) to balance environmental compatibility with performance requirements. By adjusting these compositional parameters, the system achieves adequate water jet and chemical resistance while maintaining its waterborne, environmentally friendly nature.
2Reliability
If chlorine-containing adhesion promoters are used, then adhesion performance is improved, but environmental safety deteriorates
Solution Approach 1:
The invention completely removes chlorine-containing compounds from the adhesion promoter formulation. Instead, it uses only biodegradable, chlorine-free functionalized polyolefins (amine-functionalized, hydroxyl-functionalized, and succinic anhydride-functionalized) to achieve adhesion performance on polyolefin substrates, thereby eliminating environmental safety concerns while maintaining effectiveness.
3Reliability
If surface activation treatment is applied, then adhesion properties are improved, but process complexity and cost increase
Solution Approach 1:
The adhesion promoter formulation itself contains pre-functionalized polyolefins with amine, hydroxyl, and succinic anhydride groups that can directly interact with polyolefin substrates. This preliminary functionalization within the promoter system eliminates the need for separate surface activation treatments (such as plasma, corona, or flame treatment), simplifying the overall process while maintaining adhesion performance.
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 system offers improved adhesion properties without chlorine, enhancing water jet and chemical resistance, and can be produced at reduced costs, making it suitable for various applications including automotive and packaging industries.
Implementation Method 1
an amine and/or hydroxyl functionalized polyolefin prepared via an in-situ melt reaction
Implementation Method 2
aqueous dispersion comprising the melt kneading product
Data Source
AI summary
The instant invention is an adhesion promoter system, and method of producing the same. The adhesion promoter system according to the present invention comprises an aqueous dispersion comprising the melt kneading product of: (a) at least 60 percent by weight of a first functionalized polyolefin, based on the total weight of the solid content; (b) optionally from 0.5 to less than 40 percent by weight of a second functionalized polyolefin, based on the total weight of the solid content, wherein said second functionalized polyolefin comprises homopolymers of propylene or copolymers of propylene with hexene, octene and/or other like alpha-olefins, the homopolymers or copolymers having a single unsaturation, a terminal succinic anhydride moiety, and additional succinic anhydride substitutions on the polypropylene backbone, where the succinic anhydride substitution ranges from about 5 to about 45 weight percent of second functionalized polyolefin; (c) from 0.1 to less than 20 percent by weight of a stabilizing agent, based on the total weight of the solid content; and (d) in the presence of water and optionally one or more neutralizing agents, for example, at a temperature in the range of 25° C to 200° C.