Polyphosphonate, process for its preparation and to flame-retardant thermoplastic resin composition which includes selbiges

2011 
The present invention provides a polyphosphonate having an acid value of about 5.5 mg KOH / g or less and represented by formula 1: [Formula 1] wherein A is a single bond, C1 to C5 alkylene, C1-C5-alkylidene, C5 to C6-cycloalkylidene, -S- or -SO
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