Aromatic Phosphoric Acid Ester Flame Retardant for Thermosetting Resin
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Solution Overview
Problem
Current phosphorus-type flame retardants for thermosetting resins face challenges such as reduced glass-transition temperature, poor solubility in solvents, and increased permittivity and dielectric tangent, which affect their flame retardancy and heat resistance performance in electronic devices.
Innovation Solution
An aromatic phosphoric acid ester with a specific bisphenol structure is used, which is soluble in common solvents, effectively imparts flame retardancy, and maintains heat resistance while suppressing permittivity and dielectric tangent elevation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If condensed phosphoric acid ester is used as flame retardant, then flame retardancy is improved, but glass-transition temperature is reduced
Solution Approach 1:
The patent changes the chemical structure parameters of the phosphorus-type flame retardant by introducing a specific bisphenol structure with aromatic rings and controlling the substitution patterns. This structural modification alters the thermal and electrical properties, enabling the flame retardant to maintain glass-transition temperature while providing effective flame retardancy.
Solution Approach 2:
The patent creates a composite material system combining the specifically structured aromatic phosphoric acid ester with thermosetting resin. The composite structure leverages the flame retardant properties of the phosphorus compound while the bisphenol structure contributes to maintaining thermal stability and dielectric properties, resolving the contradiction between flame retardancy and glass-transition temperature.
2Temperature
If phosphinate is used as flame retardant, then glass-transition temperature is maintained, but solubility in solvent is poor
Solution Approach 1:
The patent modifies the molecular structure parameters of the flame retardant by introducing aromatic rings and specific substitution patterns in the bisphenol structure. These structural parameter changes enhance the solubility in common solvents used to prepare laminate sheets while maintaining the glass-transition temperature, thereby resolving the contradiction between temperature maintenance and solubility.
3Ease of manufacture
If DOPO or phosphazene compounds are used as flame retardant, then solubility in solvent is improved, but permittivity and dielectric tangent are elevated
Solution Approach 1:
The patent changes the chemical structure parameters by using a specific bisphenol structure with aromatic rings and controlling substitution patterns. This structural modification results in a flame retardant that maintains good solubility in common solvents while having lower permittivity and dielectric tangent compared to DOPO and phosphazene compounds, thus resolving the contradiction between solubility and dielectric properties.
Data Source
AI summary
A flame retardant for thermosetting resin containing an aromatic phosphoric acid ester represented by the general formula (I):wherein R1 to R4 each independently represent a hydrogen atom, a C1-4 alkyl group, or a C1-4 alkoxy group; R5, R6, and R9 each independently represent a C1-10 alkyl group or a C1-10 alkoxy group; R7 and R8 each independently represent a C1-4 alkyl group or a C1-4 alkoxy group; n represents an integer of 1 to 10; n1 and n2 each independently represent an integer of 0 to 3; m1 and m2 each independently represent an integer of 0 to 4; p represents an integer of 0 to 26; and k represents an integer of 1 to 12; and when p is 2 or more, any two substituents R9 may be bonded to each other, and may be bonded to a carbon atom(s) of a ring to which the above substituents R9 are bonded, forming another ring.