Ordered polyetherketones
AssigneeE. I. Du Pont de Nemours and Company
InventorsFrank P. Gay, Christine M. Brunette
Life of this patent
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Abstract
Ordered copolymers of tere- and isophthalyl halides with diphenyl ether where the phthalyl groups alternate or where the terephthalyl or isophthalyl groups are in blocks are disclosed. These novel ordered copolyetherketones exhibit a higher level of crystallization and more rapid crystallinity behavior than corresponding random copolyetherketones. They also form completely miscible blends with certain aromatic polyetherimides.
Claims16
An ordered copolyetherketone consisting essentially of the two repeat units represented by the formulas ##STR10## where said (a) and (b) units occur at a ratio in the range of 80:20 to 25:75, said copolyetherketone being characterized by one or more of the following properties:
- (i) having a dH which is at least 5 J/g greater than the dH of a copolyetherketone of the same gross composition wherein the repeat units occur in random sequence, dH being the heat of fusion,
- (ii) having a dT which is at least 5.degree. C. less than the dT of a copolyetherketone of the same gross composition wherein the repeat units occur in random sequence, dT being the difference between the melting point and the temperature of onset of crystallization, and
- (iii) having a Tm which is at least 5.degree. C. greater than the Tm of a copolyetherketone of the same gross composition wherein the repeat units occur in random sequence, Tm being the melting point.
Dependencies are inferred from the claim text.