Patent US5288425A successfully refreshed from Google Patents.
US5288425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ferroelectric, liquid-crystalline polymers, a process for their preparation and their use in electrooptical components
Assignee: Hoechst AG
•
Filing: 1989-06-29
•
Granted: 1994-02-22
•
Expires: 2009-06-29
Abstract
Abstract A ferroelectric, liquid-crystalline polymer is composed of repeating units of the formula (I) ##STR1## in which Y 1 =H, CH 3 or F Y 2 =H or F R 1 = ##STR2## or an achiral alkyl having 2 to 16 carbon atoms, and R 3 =H or CH 3 R 2 =CH 3 , Cl or CN g and h=an integer from 0 to 10 a=2 to 20, preferably 6 to 12 b,c,d,e and f=0 or 1, where d+e+f=2 or 3 A 1 ,A 2 and A 3 =for example, 1,4-phenylene in which one or two hydrogen atoms may be substituted by F, Cl and/or CN, 1,4-cyclohexylene and M 1 ,M 2 and M 3 =for example, CO--O or O--CO. These liquid-crystalline polymers have short response times and high resistance to mechanical stresses. They can be prepared by free-radical polymerization.
Inventors
- 👤 Gunter Scherowsky
- 👤 Andreas Schliwa
- 👤 Wolfgang Trapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:15
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/02; C09K19/0225; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/26; C08F20/30; C08F20/34; C08F20/36; C09K19/3833; C09K19/3842; C09K19/3852; C09K19/3857
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
109 words
A ferroelectric, liquid-crystalline polymer comprising repeating units of the formula (I) ##STR16## in which Y 1 =H or CH 3 Y 2 =H R 1 = ##STR17## or an achiral alkyl having 2 to 16 carbon atoms, and R 3 =H or CH 3 a=2 to 20 b, c, d, e and f=0 or 1, where d+e+f=2 or 3 A 1 , A 2 and A 3 =identical or different 1,4-phenylene or 3,6-pyrimidinediyl, with the proviso that at least one of the radicals A 1 , A 2 or A 3 is not 1,4-phenylene M 2 and M 3 =identical or different CO--O or O--CO M 1 = O.
Claim 2
Dependent Claim
109 words
A ferroelectric, liquid-crystalline polymer comprising repeating units of the formula (I) ##STR16## in which Y 1 =H or CH 3 Y 2 =H R 1 = ##STR17## or an achiral alkyl having 2 to 16 carbon atoms, and R 3 =H or CH 3 a=2 to 20 b, c, d, e and f=0 or 1, where d+e+f=2 or 3 A 1 , A 2 and A 3 =identical or different 1,4-phenylene or 3,6-pyrimidinediyl, with the proviso that at least one of the radicals A 1 , A 2 or A 3 is not 1,4-phenylene M 2 and M 3 =identical or different CO--O or O--CO M 1 = O.
Claim 3
Dependent Claim
135 words
The ferroelectric, liquid-crystalline polymer as claimed in claim 1, where it is comprising 50 to 90% of units of the formula (I) in which Y 1 =H or CH 3 Y 2 =H R 1 = ##STR18## a=6 to 12, and b, c, d, e, , R 3 , A 1 , A 2 , A 3 , M 1 , M 2 and M 3 have the same meanings as in claim 1, and also of 10 to 50% of units of the formula (I) in which R 1 is an achiral alkyl having 2 to 16 carbon atoms and Y 1 , Y 2 , a, b, c, d, e, f, A 1 , A 2 , A 3 , M 1 , M 2 and M 3 have the meanings given above.
Claim 4
Dependent Claim
12 words
An electrooptical component, which comprises a polymer as claimed in claim 1.
Claim 5
Dependent Claim
12 words
An electrooptical component, which comprises a polymer as claimed in claim 2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-21 | 1997-08-23 | 1998-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-21 | 2001-08-23 | 2002-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-21 | 2005-08-23 | 2006-02-22 | $7700.00 | Window Closed / Lapsed |