Claims
- 1. A polyester consisting essentially of repeating, interpolymerized units derived from 9,9-bis-(4-hydroxyphenyl)-fluorene and isophthalic acid and/or terephthalic acid, such that said polyester is oligomer-free and in film form has an elongation at break of at least 50%.
- 2. The polyester of claim 1 wherein said polyester contains no more than 1 percent oligomeric species.
- 3. The polyester of claim 1 wherein said polyester has a polydispersivity of about 2 to 3.
- 4. The polyester of claim 1 wherein said polyester has a weight-average molecular weight of at least 500,000.
- 5. The polyester of claim 1 wherein said polyester has a weight-average molecular of at least 700,000.
- 6. The polyester of claim 1 wherein said polyester has a weight-average molecular weight of at least 900,000.
- 7. The polyester of claim 1 wherein said polyester is derived from 9,9-bis-(4-hydroxyphenyl)-fluorene and equimolar amounts of isophthalic and terephthalic acid.
- 8. A film comprising the polyester of claim 1.
- 9. The film of claim 8 wherein the thickness of the film is at least 5 microns.
- 10. The film of claim 8 wherein said film has a dissipation factor of less than 0.1 percent when measured at 250.degree. C. and frequencies up to 10 kilohertz.
- 11. The film of claim 8 wherein the thickness of the film is 5 to 12 microns.
- 12. The film of claim 8 wherein said film has a vacuum-deposited coating.
- 13. The film of claim 12 wherein said vacuum-deposited coating comprises a material suitable for a magnetic recording layer.
- 14. The film of claim 13 wherein the material suitable for magnetic recording layer is chrome-cobalt.
- 15. A tape comprising the film of claim 8 coated with an adhesive.
- 16. The polyester of claim 1 wherein the polyester is derived from 9,9 -bis(4-hydroxyphenyl)-fluorene having a purity of at least 99.8%.
- 17. The polyester of claim 1 wherein the polyester is derived from 9,9bis-(4-hydroxyphenyl)-fluorene having a purity of 99.9% to 99.95%.
- 18. An electrical device comprising an electrical conductor insulated with an oligomer-free polyester said polyester consisting essentially of repeating interpolymerized units derived from 9,9-bis-(4-hydroxyphenyl)-fluorene and isophthalic acid and or terephthalic acid wherein said polyester is present in the form of a film coated onto the conductor by solution coating, and said electrical conductor is an amorphous metallic glass ribbon.
- 19. The device of claim 18 wherein said insulative polyester coating is at least 0.5 micron thick.
- 20. An electro-magnetic core made by winding the device of claim 18.
- 21. An optical device in which oligomer-free polyester consisting essentially of repeating interpolymerized units derived from 9,9-bis-(4-hydroxyphenyl)-fluorene and isophthalic acid and/or terephthalic acid is used as a conductor of light.
- 22. The optical device of claim 21 wherein the polyester is present in the form of an optical fiber.
- 23. An optical fiber cladded with a coating comprising oligomer-free polyester consisting essentially of repeating interpolymerized units derived from 9,9-bis-(4-hydroxyphenyl)-fluorene and isophthalic acid and/or terephthalic acid.
- 24. Fibrous web comprising fibers of oligomer-free polyester that consists essentially of repeating, interpolymerized units derived from isophthalic acid and/or terephthalic acid and 9,9-bis-(4-hydroxyphenyl)-fluorene.
BACKGROUND OF THE INVENTION
This application is a continuation-in-part of application Ser. No. 348,262 filed May 5, 1989, now U.S. Pat. No. 4,967,306, issued Oct. 30, 1990.
US Referenced Citations (16)
Foreign Referenced Citations (3)
Number |
Date |
Country |
152622 |
Jun 1988 |
JPX |
PCTAT8700062 |
Oct 1987 |
WOX |
1122201 |
Jul 1968 |
GBX |
Non-Patent Literature Citations (2)
Entry |
Chemical Abstracts, vol. 70, No. 4, 1969, Abstr. No. 12086r. |
Chemical Abstracts, vol. 62, No. 7, 1964, Abstr. No. 8419b. |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
348262 |
May 1989 |
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