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Posted on 30/03/2017 in News 32 2017
Non-migrating PIN FR for polycarbonat

A US patent assigned to PolyOne, Ohio, is published for a phosphorus-mineral PIN flame retardant for polycarbonate, formed by reacting in situ (within the polymer) a phosphorus compound (alkyl-functional phenoxyphosphazene) and a silicon compound (hydride-functional siloxane).

The patent states as its achieved objectives of non-halogenated, UL94-V0 fire performance (3.2mm) in polycarbonates, non-dripping and using no solvent in production. The in-situ reaction results in an interpenetrating network (IPN) PIN FR molecular structure within the final polycarbonate polymer, so ensuring that the FR will not migrate out of the polymer into the environment.

US patent 2016/0272812, published 22 September 2016, C. Zhou, R. Avakian, Polyone Corporation “Phosphazene flame retardant polycarbonate compounds” http://www.freepatentsonline.net/20160272812.pdf 

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