Claims
- 1. A copolyimide having the repeating units ##STR4## and from about 0.1 mole % to about 30 mole % ##STR5## wherein R and R.sub.1 are selected from a group consisting of at least one of an aromatic diamine moiety having bulky methyl groups ortho to the amine, and a co-diamine moiety; or the polyamic acid, salts, or polyester precursors therefor; wherein the photosensitivity of the polyimide is less than about 1,000 mJ/cm.sup.2, and wherein the birefringence is from about minus 0.25 to about plus 0.25.
- 2. The copolyimide of claim 1 wherein the photosensitivity is less than about 300 mJ/cm.sup.2.
- 3. The copolyimide of claim 1 wherein the aromatic diamine moiety having bulky methyl groups ortho to the amine is selected from the group consisting of ##STR6##
- 4. The copolyimide of claim 3 wherein the aromatic diamine moiety having bulky methyl groups ortho to the amine is ##STR7##
- 5. The copolyimide of claim 4 wherein the co-diamine moiety is selected from the group consisting of BAAF, ABL-21, DABF, and 124-OBABTF.
- 6. The copolyimide of claim 1 wherein the co-diamine is substituted with fluorine groups.
Parent Case Info
This application is a divisional of U.S. application Ser. No. 07/994,637 filed Dec. 22, 1992, now U.S. Pat. No. 5,317,082.
US Referenced Citations (6)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0303774 |
Feb 1989 |
EPX |
0454590 |
Oct 1991 |
EPX |
0456463 |
Nov 1991 |
EPX |
0502400 |
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EPX |
Non-Patent Literature Citations (1)
Entry |
Database WPI, JP 4 328 127, Apr. 26, 1991 (2 pages) Pub. Nov. 17, 1992. |
Divisions (1)
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Number |
Date |
Country |
Parent |
994637 |
Dec 1992 |
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