Oligomeric Bis-Phosphate Flame Retardants for Resin Stability
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Solution Overview
Problem
Existing resin compositions face handling challenges with viscous liquid oligomeric bis-phosphates and premature melting of solid phosphate ester flame retardants, which interfere with the extrusion process and result in suboptimal physical properties.
Innovation Solution
Development of oligomeric hydroquinone bis-phosphate flame retardants in the form of free-flowing powders or waxy-like solids with specific molecular structures, which are compounded with resins to enhance flame retardancy and physical properties such as UV stability, hydrolytic stability, and heat distortion temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If viscous liquid oligomeric bis-phosphates are used as flame retardants, then flame retardancy is achieved, but handling difficulty increases and special equipment is required
Solution Approach 1:
The patent changes the physical state parameter of the flame retardant from liquid to solid powder form by controlling the oligomeric structure (n value between 0.2 and 2.0). This parameter change transforms the material from a viscous liquid requiring heated reservoirs to a free-flowing powder that can be handled at ambient temperatures, resolving the handling difficulty while maintaining flame retardancy
Solution Approach 2:
The patent creates a composite material system by combining specific oligomeric phosphate structures with polycarbonate and styrenic polymers. The controlled oligomeric composition (average n value) produces a material that exhibits both flame retardant properties and improved physical characteristics including free-flowing powder morphology, eliminating the need for specialized handling equipment
2Ease of operation
If solid phosphate ester flame retardants are used, then handling ease is improved, but premature melting occurs causing processing interference
Solution Approach 1:
The patent modifies the molecular structure parameters of the phosphate ester by controlling the oligomeric composition (average n value between 0.2 and 2.0) to achieve an optimal balance. This structural parameter change raises the melting point and improves thermal stability, preventing premature melting during extrusion while maintaining the solid powder form for easy handling
Solution Approach 2:
The patent describes a delivery system using a fluidized bed dryer and pneumatic conveying to transport the solid phosphate ester powder. The system uses air flow to fluidize and convey the powder through heated zones without direct contact heating, preventing premature melting while maintaining processing stability
3Stability of the object's composition
If oligomeric phosphates with average n value of 1.02 are used, then UV stability and hydrolytic stability are improved, but manufacturing complexity increases
Solution Approach 1:
The patent identifies and controls the critical parameter of average n value (oligomeric degree) to achieve optimal stability. By specifying narrow ranges (0.2 to 2.0, preferably 0.5 to 1.5, most preferably about 1.02), the patent achieves improved UV and hydrolytic stability while providing clear manufacturing guidelines that balance performance with manufacturability
Data Source
AI summary
An oligomeric phosphate or mixture of oligomeric phosphates having the general formula (I) wherein R1, R2, R3 and R4 each independently is aryl or alkaryl and n has an average value of from about 1.0 to about 2.0 and resin compositions containing the same.