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Fritz Nauer Ag, Empa - Swiss Federal Laboratories for Materials Science and Technology | Date: 2012-08-06

A group of novel compounds containing one or more amino substituted DOPO (9,10-dihydro-9-oxa-phosphaphenthren-10-oxide) moieties. The compounds were found to have good flame retardant properties and also good thermal stability, which makes them particularly suitable as flame retardant additives for various thermoplastic polymers. In particular, they can be incorporated in a polyurethane foam.


Neisius M.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Liang S.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Mispreuve H.,Fritz Nauer AG | Gaan S.,Empa - Swiss Federal Laboratories for Materials Science and Technology
Industrial and Engineering Chemistry Research | Year: 2013

In this study, we have investigated the structure-flame-retardant (FR) efficacy relationships of phosphoramidates (PRs) on flexible polyurethane foam (FPUF). FPUFs that contain model monosubstituted secondary PRs, monosubstituted tertiary PRs, and trisubstituted secondary PRs were prepared and evaluated for FR efficacy and thermal decomposition characteristics. The fire test results indicate that methyl ester PRs exhibit better FR behavior, compared to analogous phenyl ester derivatives at equal weight percentage in polyurethane (PU) foams. Within the same class of PRs, the monoallyl derivatives exhibited the highest level of flame retardancy. The multiallyl PR derivatives did not offer any advantage, in terms of improved flame retardancy. Evolved gas analysis from the thermal degradation of PU foams indicates that the PRs are volatilized in the first stage of thermal decomposition and are primarily active in the gas phase with the exception of the triallyl-PR derivative, which is primarily active in the condensed phase. © 2013 American Chemical Society.


Gaan S.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Neisius M.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Cuchere O.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Liang S.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Mispreuve H.,Fritz Nauer AG
Fire Safety Science | Year: 2014

Development of new halogen-free flame retardants for application in polymer is becoming important due to ban of some existing halogenated flame retardants, ineffectiveness of existing flame retardant additives and higher fire performance requirements for materials. Polyurethane is an important class of polymer finding application in diverse areas like textile coatings, wood coatings, foams, fibers, cables, adhesives etc. There is a great need to develop halogen free flame retardants for various PU based materials. In this work we have reported synthesis of novel phosphonamidates as flame retardant additives and their application in manufacturing flame retardant flexible PU foams and flame retardant polyester PU coated fabrics. Furthermore the flame retardant properties and thermal decomposition characteristics of the PU based materials have been evaluated. The novel phosphonamidate derivatives have superior fire performance properties as compared to existing commercial flame retardant additives and work primarily in gas phase by recombining H∗ and OH∗ radicals. © Copyright 2014 International association for fire safety science.


Stelzig T.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Buczko A.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Bommer L.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Liang S.,Empa - Swiss Federal Laboratories for Materials Science and Technology | And 4 more authors.
25th Annual Conference on Recent Advances in Flame Retardancy of Polymeric Materials | Year: 2014

DOPO-phosphonamidates: Green synthesis method-alternative to CCl4 chlorination, dispersion of solid FR in PU foams, application in PU foams, thermal stability and compatibility in PA6. New FRs: (Meltable) concept of hybrid FRs, suitable for thin walled application(fibers, EPs) in polyesters, new P and N FRs for Epoxy resins.


Neisius N.M.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Liang S.,Empa - Swiss Federal Laboratories for Materials Science and Technology | Mispreuve H.,Fritz Nauer AG | Gaan S.,Empa - Swiss Federal Laboratories for Materials Science and Technology
ACS Symposium Series | Year: 2012

This short review is focused on scientific developments and studies inflame retardancy of flexible polyurethane (PU) foams that has been published during the last three years. Since an increasing number of brominated flame retardants are banned and chloro-phosphate esters like TCEP, TDCPP, TDCP are either banned or under investigation by environmental agencies, the industrial and academic flame retardant research in PU foams has gained impetus. It is a mutual understanding that more environmentally benign and less hazardous materials should be used in the future. In the first part of this article we have reviewed the recent efforts of various research groups towards the development of such kind of flame retardants for PU foams. The second part of this article details some investigations on possible synergistic or antagonistic interactions between phosphoramidate compounds and melamine inflame retardancy of flexible polyurethane foam (FPUF). © 2012 American Chemical Society.

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