Polycarbonate - ultem block copolymers
AssigneeGeneral Electric Company
InventorsFarid Khouri, Julia Lee, Sheldon Shafer
Life of this patent
Estimating the term…
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 Mw while 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.
Claims19
A block copolymer comprising blocks of:
- (i) polyetherimide or polyimide, the block having an average Mn of at least 7,000, and
- (ii) polycarbonate,
- wherein the weight ratio of blocks (i) to the block copolymer is between 0.10 and 0.90.
A method of forming a block copolycarbonate wherein the method comprises the steps of,
- (i) forming a first reaction mixture comprising a hydroxy terminated polyetherimide oligomer blocks or polyimide oligomer blocks,
- (ii) adding to the first reaction mixture an activated carbonate and a dihydroxy composition, thereby forming a second reaction mixture, and
- (iii) allowing the second reaction mixture to react,
- thereby forming a block copolycarbonate.
A block copolymer comprising:
- (i) residues from a hydroxy terminated polyetherimide or polyimide,
- (ii) residues from a dihydroxy compound different than (i), and
- (iii) residues from an activated carbonate.
Dependencies are inferred from the claim text.