Triazine-Arylhydroxy-Aldehyde Condensates with Low Viscosity
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Solution Overview
Problem
Current triazine-phenol-aldehyde (TPA) condensates exhibit high viscosity and low nitrogen content, leading to instability at higher temperatures and reduced solubility in solvents like methyl ethyl ketone (MEK) and acetone, which complicates their use as effective flame retardants and curing agents for epoxy resins, particularly in large-scale manufacturing.
Innovation Solution
The formation of triazine-arylhydroxy-aldehyde condensates using an acid catalyst with a pKa value greater than 3.8, which results in products with up to 28 wt.% nitrogen, a melt viscosity of less than 3,000 cps at 175°C, and improved solubility of up to 80 wt.% in organic solvents, such as MEK, maintaining stability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional acid catalysts with pKa ≤ 3.8 are used to form TPA condensates, then the condensation reaction proceeds efficiently, but the resulting condensates exhibit high viscosity and poor solubility in common solvents
Solution Approach 1:
The patent applies parameter changes by selecting acid catalysts with a specific pKa range (greater than 3.8), which fundamentally alters the reaction conditions to produce condensates with improved solubility and reduced viscosity while maintaining condensation efficiency
Solution Approach 2:
The patent uses specific acid catalysts as intermediaries to mediate the condensation reaction between triazine, arylhydroxy, and aldehyde monomers, where the catalyst's pKa value acts as a controlling parameter to achieve desired product properties
2Ease of manufacture
If conventional processes are used to produce TPA condensates, then production can proceed, but the condensates exhibit instability at higher temperatures
Solution Approach 1:
The patent changes the chemical composition parameters by using acid catalysts with pKa > 3.8, which produces condensates with different molecular structures that exhibit enhanced thermal stability while remaining manufacturable
3Reliability
If conventional TPA condensates are used as flame retardants, then flame retardancy is achieved, but the high viscosity complicates their use in epoxy formulations
Solution Approach 1:
The patent changes the viscosity parameter of TPA condensates by controlling the acid catalyst selection (pKa > 3.8), resulting in lower viscosity products that are easier to process while maintaining flame retardant properties
4Quantity of substance
If existing TPA condensate compositions are used, then nitrogen content is present, but the atomic nitrogen content is only 1 to 10 wt.%, limiting flame retardancy efficiency
Solution Approach 1:
The patent changes the compositional parameters by optimizing the molar ratios of triazine, arylhydroxy, and aldehyde monomers in the condensation reaction, which increases the atomic nitrogen content to 10-40 wt.% and improves flame retardancy efficiency
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 triazine-arylhydroxy-aldehyde condensates demonstrate enhanced solubility, stability, and reactivity, allowing for effective use as flame retardants and curing agents in epoxy resins without compromising mechanical properties, and can be manufactured on a commercial scale with improved control over viscosity and reduced viscosity increase during processing.
Implementation Method 1
a condensation product formed from a reaction mixture of a triazine monomer, an arylhydroxy monomer, an aldehyde monomer, and an acid catalyst having a pKa value greater than 3.8
Data Source
AI summary
Compositions and methods for forming condensates and resin compositions are provided. In one embodiment, a condensate is formed from a reaction mixture including a triazine monomer, an arylhydroxy monomer, an aldehyde monomer and an acid catalyst having a pKa value of greater than 3.8. The condensates contain up to 28 wt.% of nitrogen and have a melt viscosity of 3,000 cps or less at 175 °C. The condensates may have a solubility of at least 80 wt.% solids dissolved in an organic solvent for 120 hours or greater. Also disclosed are methods for the manufacture of the condensate as well as the condensate's use in fire-retardant epoxy resin compositions suitable for the manufacture of laminates for electronic applications. There is also disclosed a glycidylated triazine- arylhydroxy-aldehyde condensate of this invention.