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US 5,312,890 AGranted
Polycarbonate compositions comprising bisphosphine oxide monomer
AssigneeGeneral Electric Company
InventorGary C. Davis
Life of this patent
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Abstract
Bisphosphine oxide monomers and homologs thereof may be incorporated into polycarbonates in order to obtain a flame retardant polymer. More particularly, bis[2,5-(diphenylphosphine oxide)]-1,4-hydroquinone and homologs thereof may be used to prepare flame retardant polycarbonates that retain high glass transition temperature and high impact resistances.
Claims7
A polycarbonate polymer comprising the structural units of the formula ##STR5## wherein A.sup.1 is a tetravalent or hexavalent substituted or unsubstituted aromatic radical and A.sup.2 and A.sup.3 each are independently selected from aromatic radicals.
Dependencies are inferred from the claim text.