Claims
- 1. A sized fiber suitable as a reinforcement in a composite comprising fibers and an amide-imide polymer matrix resin, said sized fiber consisting of a thermally stable fiber having coated on the surface thereof from about 0.1 to about 5 percent by weight, based on weight of the fiber, of a sizing composition consisting of an amide-imide phthalamide copolymer.
- 2. The sized fiber of claim 1 wherein said amide-imide phthalamide copolymer comprises recurring A units of: ##STR5## capable of undergoing imidization wherein .fwdarw. denotes isomerization, recurring B units of: ##STR6## and recurring C units of: ##STR7## wherein R is an aromatic hydrocarbon moiety selected from the group consisting of divalent aromatic hydrocarbon radicals of from 6 to about 10 carbon atoms, 2 divalent aromatic hydrocarbon radicals of about 6 to about 10 carbon atoms joined directly or by stable linkages selected from the group consisting of --O--, methylene, --CO--, --SO.sub.2 -- and --S-- and mixtures thereof, and X is a divalent aromatic radical.
- 3. The sized fiber of claim 2 wherein R and X are independently selected from the group consisting of: ##STR8##
- 4. The sized fiber of claim 1 wherein said amide-imide phthalamide copolymer comprises from about 20 to about 80 mole % of C units.
- 5. The sized fiber of claim 1 wherein said thermally stable fiber is carbon fiber.
- 6. The sized fiber of claim 1 in the form of chopped fiber.
- 7. A carbon fiber having coated on the surface thereof from about 0.1 to about 5 percent by weight, based on weight of the fiber, of a sizing composition consisting of an amide-imide phthalamide copolymer having recurring A units of: ##STR9## capable of undergoing imidization wherein .fwdarw. denotes isomerization; recurring B units of: ##STR10## and from about 20 to about 80 mole % recurring C units of: ##STR11## wherein R is an aromatic hydrocarbon moiety selected from the group consisting of divalent aromatic hydrocarbon radicals from 6 to about 10 carbon atoms, two divalent aromatic hydrocarbon radicals from 6 to about 10 carbon atoms joined directly or by stable linkages selected from the group consisting of --O--, methylene, --CO--, --SO.sub.2 -- and --S--.
- 8. The carbon fiber of claim 7 wherein said recurring A units are: ##STR12## said recurring B units are: ##STR13## and said recurring C units are: ##STR14##
- 9. The carbon fiber of claim 7 in the form of chopped carbon fiber.
Parent Case Info
This Application is a continuation of prior application Ser. No. 07/322,195, filed Mar. 13, 1989, now abandoned; which was a continuation of application Ser. No. 06/905,759, filed Sep. 9, 1986, now abandoned; which was a continuation-in-part of application Ser. No. 06/642,523, filed Aug. 20, 1984, now abandoned; and a continuation-in-part of application Ser. No. 06/759,421, filed Jul. 26, 1985, now U.S. Pat. No. 4,640,944, which was a continuation of application Ser. No. 06/576,137, filed Jan. 31, 1984, now abandoned; and a continuation-in-part of application Ser. No. 06/383,268, filed May 28, 1982, now U.S. Pat. No. 4,467,011.
US Referenced Citations (8)
Continuations (3)
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322195 |
Mar 1989 |
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905759 |
Sep 1986 |
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Parent |
576137 |
Jan 1984 |
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Continuation in Parts (1)
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642523 |
Aug 1984 |
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