Claims
- 1. A polybenzoxazole comprising the following recurring structure in the polymer chain: ##STR9## wherein: R is a tetravalent aromatic moiety having the formula: ##STR10## R" is selected from an alkylene, alicyclic or aromatic moiety; Z is independently selected from chloro, bromo, fluoro, iodo or lower alkyl of 1 to 6 carbons and n is independently 0 or 1.
- 2. A polybenzoxazole according to claim 1 wherein R is: ##STR11## wherein the 3 and 3' ring bonds ,are linked to an nitrogen atom in the polymer chain and 4 and 4 ring bonds are linked oxygen atom in said chain.
- 3. A film comprising a polybenzoxazole according to claim 1 or 2.
- 4. A shaped part comprising a polybenzoxazole according to claim 1 or 2.
- 5. A liquid crystal display orientation layer comprising a polybenzoxazole according to claim 1 or 2.
- 6. The polybenzoxazole of claim 1 wherein n is 0.
- 7. The polybenzoxazole of claim 6 wherein R is the amide condensation residuum of the amine:
- 4,4'-bis[2-(3-amino-4-hydroxyphenyl)-hexafluoroisopropyl]diphenyl ether. diphenyl ether.
- 8. The polybenzoxazole of claim 7 further including the amide condensation residuum of 2,2-hexafluoro-bis-(3-amino-4-hydroxyphenyl) propane in the polymer structure.
- 9. The polybenzoxazole of claim 1 which is based on the amide condensation residuum of one or a mixture of acid halides having the formula: ##STR12## wherein R" represents a divalent alkylene, alicyclic or aromatic moiety, and halo represents halogen.
- 10. The polybenzoxazole of claim 9 wherein the acid halide is selected from the group consisting of isophthaloyl chloride, terephthaloyl chloride, 2,2-hexafluoro-bis-(4-chlorocarbonylphenyl propane, 4,4'-bis[2-(4-chlorocarbonyl-phenyl) hexafluoroisopropyl] diphenyl ether, 4,4'para-diphenyl ether dibenzoyl chloride, 4,4'-para-phenylenedioxy dibenzoyl chloride, 2,6-naphthalene diacid chloride, and mixtures thereof.
- 11. The polybenzoxazole of claim 10 wherein the acid halide is a mixture of isophthaloyl chloride and terephthaloyl chloride.
- 12. The polybenzoxazole of claim 10 wherein the acid halide consists of isophthaloyl chloride.
- 13. The polybenzoxazole of claim 10 wherein the acid halide consists of terephthaloyl chloride.
Parent Case Info
This is a continuation of co-pending application Ser. No. 7/124,634 filed on Nov. 24, 1987, now U.S. Pat. 4,845,183.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3449296 |
Angelo et al. |
Jun 1969 |
|
4477648 |
Jones et al. |
Oct 1984 |
|
4845183 |
Mueller et al. |
Jul 1989 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2188936 |
Oct 1987 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
124634 |
Nov 1987 |
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