Patent US4293435A successfully refreshed from Google Patents.
US4293435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-crystalline polymer phase having a cholesteric structure, processes for its preparation and its use
Assignee: BASF SE
•
Filing: 1979-07-19
•
Granted: 1981-10-06
•
Expires: 1999-07-19
Abstract
Abstract A liquid-crystalline polymer phase having an induced cholesteric structure comprises a component having a chiral structure and a component having a nematic structure and contains a polymer with nematogenic units of the formula ##STR1## wherein R 1 is hydrogen or methyl, n is an integer from 1 to 6 and R 3 represents specific structural elements containing at least two phenylene groups. Preferred is a copolymer comprising a component of the above formula and an additional chiral component of similar structure, prepared by copolymerization of the nematogenic monomer with the chiral monomer. The liquid-crystalline polymer phase permits variation of the wavelength of the reflected light λ R , and its cholesteric structure can be converted to the glassy polymer state and remains preserved in the solid state. Such liquid-crystalline polymer phases can be used in integrated optics, opto-electronics and information storage, e.g. for the manufacture of polarization filters or selective reflectors.
Inventors
- 👤 Michael Portugall
- 👤 Heino Finkelmann
- 👤 Helmut Ringsdorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:02
CPC Classifications
C; C07; C07C; C07C43/00; C07C43/02; C07C43/20; C07C43/23; B; B29; B29C; B29C71/00; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/20; C09K19/2007; C09K19/2021; C09K19/38; C09K19/3833; C09K19/3842; C09K19/3852; C09K19/3857; C09K19/3866; B29K; B29K2105/00; B29K2105/0079; C09K2019/0444; C09K2019/0448
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
192 words
A composition of matter exhibiting a liquid-crystalline cholesteric polymer phase consisting essentially of (1) at least one copolymer which contains (a) nematogenic units of the formula (I) ##STR74## where R 1 is hydrogen or methyl, n is an integer from 1 to 6 and R 3 is ##STR75## where Z is COO-- or OCO--, R 2 is --O(CH 2 ) m H, --(CH 2 ) m H or --COO--(CH 2 ) m H, m being an integer from 1 to 6, and R 7 is hydrogen or R 2 , and (b) chiral units of the formula (II) ##STR76## in which R 1 is hydrogen or methyl, n is an integer from 1 to 10 and R 4 is ##STR77## where Z is COO-- or OCO-- and R 5 is --CH═N--R 6 , --OR 6 , --COOR 6 , --CH═CH--COOR 6 or --R 6 , R 6 being alkyl or alkylaryl of 4 to 10 carbon atoms and having at least one asymmetric carbon atom or (2) a mixture of (a) a polymer having a nematic structure and containing units of the formula (I) and (b) a compound having a chiral structure.
Claim 2
Dependent Claim
192 words
A composition of matter exhibiting a liquid-crystalline cholesteric polymer phase consisting essentially of (1) at least one copolymer which contains (a) nematogenic units of the formula (I) ##STR74## where R 1 is hydrogen or methyl, n is an integer from 1 to 6 and R 3 is ##STR75## where Z is COO-- or OCO--, R 2 is --O(CH 2 ) m H, --(CH 2 ) m H or --COO--(CH 2 ) m H, m being an integer from 1 to 6, and R 7 is hydrogen or R 2 , and (b) chiral units of the formula (II) ##STR76## in which R 1 is hydrogen or methyl, n is an integer from 1 to 10 and R 4 is ##STR77## where Z is COO-- or OCO-- and R 5 is --CH═N--R 6 , --OR 6 , --COOR 6 , --CH═CH--COOR 6 or --R 6 , R 6 being alkyl or alkylaryl of 4 to 10 carbon atoms and having at least one asymmetric carbon atom or (2) a mixture of (a) a polymer having a nematic structure and containing units of the formula (I) and (b) a compound having a chiral structure.
Claim 3
Dependent Claim
33 words
The composition of matter of claim 1, wherein the liquid-crystalline cholesteric polymer phase is a copolymer which contains (a) nematogenic units of the formula (I) and (b) chiral units of the formula (II).
Claim 4
Dependent Claim
39 words
The composition of matter of claim 1, wherein the liquid-crystalline cholesteric polymer phase is a mixture of (a) a polymer having a nematic structure and containing units of the formula (I) and (b) a compound having a chiral structure.
Claim 5
Dependent Claim
89 words
The composition of matter of claim 3, wherein the compound having a chiral structure is a polymer with chiral units of the formula ##STR78## where R 1 is hydrogen or methyl, n is an integer from 1 to 10 and R 4 is ##STR79## where Z is COO-- or OCO-- and R 5 is --CH═N--R 6 , --OR 6 , --COOR 6 , --CH═CH--COOR 6 or --R 6 , R 6 being alkyl or alkylaryl of 4 to 10 carbon atoms and having at least one asymmetric carbon atom.
Claim 6
Dependent Claim
15 words
The composition of matter of claim 1, 2 or 3, wherein R 3 is ##STR80##
Claim 7
Dependent Claim
15 words
The composition of matter of claim 1, 2 or 3, wherein R 3 is ##STR81##
Claim 8
Dependent Claim
12 words
The composition of matter of claim 2, wherein R 4 is ##STR82##
Claim 9
Dependent Claim
12 words
The composition of matter of claim 4, wherein R 4 is ##STR83##
Claim 10
Dependent Claim
12 words
The composition of matter of claim 4, wherein R 4 is ##STR84##
References Cited (Backward Citations)
US4001137A
Cited
US4065489A
Cited
US4070912A
Cited
DE2736424A1
Cited
US4149413A
Cited
US4195916A
Cited
US4140016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |