Polycarbonate—ultem block copolymers

Details Polycarbonate—ultem block copolymers Polycarbonate—ultem block copolymers

2007-06-12

2007-06-12

Boykin, Terressa (Department: 1711)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C525S433000, C525S439000, C525S468000, C528S170000, C528S271000

Reexamination Certificate

active

11015216

ABSTRACT:
The present invention provides novel block copolycarbonates comprising residues from a hydroxy terminated polyetherimide or polyimide, residues from a dihydroxy compound, and residues from an activated carbonate. In a preferred embodiment of the present invention the polyetherimide or polyimide blocks exhibit high Mwwhile the resulting block copolycarbonate exhibits a single Tg. The novel block copolycarbonates of the present invention are produced under melt polymerization conditions in the presence an activated carbonate source.

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