Copolyesters derived from aliphatic glycols, aromatic dicarboxylic acids and poly(alkylene-oxides) and films made therefrom
AssigneeMylar Specialty Films U.S. Limited Partnership
InventorsStephen Jones, Stephen Sankey, Lucien Schosseler, Megan Meaburn, David Turner
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Abstract
An optionally oriented copolyester film comprising a copolyester which comprises repeating units derived from an aliphatic diol, an aromatic dicarboxylic acid and a poly(alkylene oxide), wherein the copolyester film further comprises lithium ions, and wherein the film has a thickness of no more than about 25 μm. The copolyester film is suitable for use a separator in a lithium-ion rechargeable battery.
Claims29
An oriented copolyester film comprising a copolyester which comprises repeating units derived from an aliphatic diol, an aromatic dicarboxylic acid and a poly(alkylene oxide), wherein the copolyester film further comprises lithium ions, wherein the film is a self-supporting film and wherein the film has a thickness of no more than 25 μm;
- wherein said lithium ions are derived from lithium salts selected from lithium salts of:
- (i) carbonic acids;
- (ii) phenolic acids;
- (iii) the aromatic dicarboxylic acid from which the copolyester is derived;
- or
- (iv) an alkoxylate ester of the aromatic dicarboxylic acid from which the copolyester is derived wherein the alkoxylate ester is derived from the aliphatic diol from which the copolyester is derived.
Dependencies are inferred from the claim text.