التفاصيل البيبلوغرافية
| العنوان: |
Method of liquid-crystal polymer film production |
| Document Number: |
20060113507 |
| تاريخ النشر: |
June 1, 2006 |
| Appl. No: |
11/260593 |
| Application Filed: |
October 27, 2005 |
| مستخلص: |
The invention relates to the production of liquid-crystal films and coatings from substituted poly-para-xylylenes to be used as alignment layers in different electrooptical devices (alphameric indicators, displays, optical shutters, etc.). Particularly, the invention is directed to a one-step method for producing a liquid-crystal polymer film of the substituted poly-para-xylylene, said film simultaneously exhibiting the orienting properties with respect to LC molecules. The essence of a claimed method is in production of films and coatings from the substituted poly-para-xylylene by means of the successive execution in vacuum of sublimation at 0-350° C. and pyrolysis at 450-700° C. of the substituted cyclic di-para-xylylene in which substituent groups have terminal mesogenic groups, and condensation of the pyrolysis-generated substituted para-xylylene simultaneously with its polymerization on a substrate at 150-320° C. The process is performed at a predetermined film formation rate on the substrate surface. Produced are liquid-crystal polymer materials which films are good orientants with respect to LC molecules. |
| Inventors: |
Teleshov, Eduard Nikanorovich (Moscow, RU); Kardash, Igor Efimovich (Moscow, RU); Kardash, Anna Igorevna (Moscow, RU); Mailyan, Karen Andranikovich (Moscow, RU); Chvalun, Sergey Nikolaevich (Moscow, RU); Pebalk, Andrey Vladimirovich (Moscow, RU) |
| Claim: |
1. A method for producing a liquid-crystal polymer film comprising: (a) sublimating a substituted di-para-xylylene having at least one mesogenic group at a temperature of 0□ to 350□; (b) pyrolysing the di-para-xylylene to form a substituted para-xylylene; and (c) condensing and polymerizing the substituted para-xylylene at a temperature of 150° c. to 320° c. to form a film made of a substituted poly-para-xylylene on a substrate. |
| Claim: |
2. The method of claim 1, wherein the substituted di-para-xylylene comprises not more than 2 substituent groups in aromatic rings, wherein the substituent groups include junction groups by which the substituent groups themselves are connected to the aromatic rings, and mesogenic groups. |
| Claim: |
3. The method of claim 2, the substituted di-para-xylylene is represented by formula (I): [chemical expression included] wherein x+y≦2; Rx═H, y=1 or 2 when x=0; Ry═H, x=1 or 2 when y=0; Rx and Ry is same when x=y=1. |
| Claim: |
4. The method of claim 2, the mesogenic groups are one selected from among the following groups: (a) derivatives of p-hydroxybenzoic acid, mainly esters of the type: —O—Ar—COO—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, and others (m=2, 3, 4); (b) p-biphenylic compounds of the type: —Ar—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, CN, and others (m=2, 3, 4); (c) p-azomethines possibly containing substituents in the para position of the type: —Ar—N═CH—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, and others (m=2, 3, 4); (d) derivatives of azobenzene of the type: —Ar—N═N—Ar—X, wherein X═H, —CmH2m+1, —OCmH2+1, and others (m=2, 3, 4); (e) possible combinations of these fragments. |
| Claim: |
5. The method of claim 2, the junction groups are one selected from formula (II) or (III): —(CH2)m— (II) wherein m=3 to 8; —(CH2)x—O—(CH2)y—O— (III) |
| Claim: |
6. The method of claim 1, wherein the step (a) is performed at a temperature of 15° c. to 100° c. |
| Claim: |
7. The method of claim 1, wherein the step (c) is performed at a temperature of 210° c. to 290° c. |
| Claim: |
8. The method of claim 1, wherein the step (a) to (c) is performed at a residual pressure in a system of 0.000001 to 0.5 mmHg. |
| Claim: |
9. The method of claim 1, wherein the substituted poly-para-xylylene in the step (c) is polymerized at a velocity of 0.0001-0.01 μm/min. |
| Claim: |
10. The method of claim 1, wherein the film has a thickness of 20 nm to 10 μm. |
| Claim: |
11. The method of claim 1, wherein the film is used as alignment layer for aligning liquid-crystal molecules. |
| Claim: |
12. A liquid-crystal polymer film produced from cyclic di-para-xylylene, wherein the cyclic di-para-xylylene comprises not more than 2 substituent groups in aromatic rings, wherein the substituent groups include junction groups by which the substituent groups themselves are connected to the aromatic rings, and mesogenic groups, wherein the mesogenic groups are one selected from among the following groups: (a) derivatives of p-hydroxybenzoic acid, mainly esters of the type: —O—Ar—COO—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, and others (m=2, 3, 4); (b) p-biphenylic compounds of the type: —Ar—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, CN, and others (m=2, 3, 4); (c) p-azomethines possibly containing substituents in the para position of the type: —Ar—N═CH—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, and others (m=2, 3, 4); (d) derivatives of azobenzene of the type: —Ar—N═N—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, and others (m=2, 3, 4); (e) possible combinations of these fragments. |
| Claim: |
13. A liquid-crystal polymer film comprising poly-para-xylylene derivatives, wherein the poly-para-xylylene derivatives have at least one mesogenic group selected from among the following groups: (a) derivatives of p-hydroxybenzoic acid, mainly esters of the type: —O—Ar—COO—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, and others (m=2, 3, 4); (b) p-biphenylic compounds of the type: —Ar—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, CN, and others (m=2, 3, 4); (c) p-azomethines possibly containing substituents in the para position of the type: —Ar—N═CH—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, and others (m=2, 3, 4); (d) derivatives of azobenzene of the type: —Ar—N═N—Ar—X, wherein X═H, —CmH2m+1, —OCmH2m+1, and others (m=2, 3, 4); (e) possible combinations of these fragments. |
| Current U.S. Class: |
252299/010 |
| Current International Class: |
09; 09; 09; 09; 02 |
| رقم الانضمام: |
edspap.20060113507 |
| قاعدة البيانات: |
USPTO Patent Applications |