Fire retardant polymers: Poly(pyridiniu salt)s containing both phosphine oxide and sulfide (or sulfone) moieties as well as poly(pyridinium salt)s with sulfide or sulfone moieties


Inventor Pradip K. Bhowmik

His expertise includes Organic and Polymer Synthesis, Nanomaterials Synthesis, Green Chemistry, Ionic Liquids, and Anticancer Drugs


Polymers are extensively used in everyday life due to their tunable properties and ease of processing. These qualities render polymers useful for applications ranging from adhesives and lubricants to structural components and windows for aircraft. Common polymers are also highly combustible, and produce toxic gasses and smoke during combustion. This invention describes the synthesis of a series of poly(pyridinium salts) that are prepared by ring-transmutation polymerization of bis pyrylium salts with both phosphine oxide and sulfide-containing aromatic diamines. Additionally, phosphine-containing triamine and phosphazene hexamine monomers are also disclosed as fire retardant additives for various applications. They have high char yields and low flammability.

  • These ionic polymers can be useful for coating any surfaces to make them fire resistant 
  • Can be used to make fire textiles and any fabrics
  • Can be used to electrostatic discharge coating to protect printed circuit applications
  • Potential use for protection of electronic and optoelectronic device applications
  • Can be used for heat transfer fluids
  • Additives for high performance lubricating oils

Market Opportunity 

According to Markets and Markets, “the flame retardants market is estimated to grow from $7B in 2022 to 9.5B by 2028, at a CAGR of 5.2%. Also on Grand View Research, it is stated that “The demand for flame Retardants is anticipated to be driven by the growing usage of fire-resistant products in various end-use industries, such as electrical & electronics, transportation, construction, and others.”


Patent Information:
For Information, Contact:
John Minnick
Business Development Officer
University of Nevada, Las Vegas
Pradip Bhowmik
Haesook Han
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