← Back to Patent Explorer
EP0007574B1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Liquid-crystalline polymeric phase with a cholesteric structure, method for its preparation and its use

Assignee: BASF SE
•
Filing: 1979-07-18
•
Granted: 1983-05-25
•
Expires: 1999-07-18
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

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 <IMAGE> wherein R1 is hydrogen or methyl, n is an integer from 1 to 6 and R3 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 lambda 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 Dipl.-Chem. Portugall
  • 👤 Heino Dr. Dipl.-Chem. Finkelmann
  • 👤 Helmut Dr. Dipl.-Chem. Ringsdorf

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 11:32
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: 13
Claim 1
Independent Claim 95 words
A liquid-crystalline polymer phase having a cholesteric structure and comprising at least one component which without an additive has a nematic structure, and at least one further component having a chiral structure, which polymer phase contains a homopolymer or copolymer containing nematogenic units of the following formula where R 1 is hydrogen or methyl, n is an integer from 1 to 6 and R 3 is or where Z is COO - or OCO -, R 2 is m being an integer from 1 to 6, and R 7 is hydrogen or R 2 .
Claim 2
Dependent Claim 95 words
A liquid-crystalline polymer phase having a cholesteric structure and comprising at least one component which without an additive has a nematic structure, and at least one further component having a chiral structure, which polymer phase contains a homopolymer or copolymer containing nematogenic units of the following formula where R 1 is hydrogen or methyl, n is an integer from 1 to 6 and R 3 is or where Z is COO - or OCO -, R 2 is m being an integer from 1 to 6, and R 7 is hydrogen or R 2 .
Claim 3
Dependent Claim 100 words
A polymer phase as claimed in claim 1, being a copolymer which contains nematogenic units of the formula given in claim 1 and chiral units of the formula in which latter formula R 1 is hydrogen or methyl, n is an integer from 1 to 10 and R 4 is or 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 of 4 to 10 carbon atoms and having at least one asymmetric carbon atom, or CH(CH 3 )-C 6 H 5 .
Claim 4
Dependent Claim 45 words
A polymer phase as claimed in claim 1, which contains a mixture of a polymer containing nematogenic units of the formula given in claim 1 or a low molecular weight chiral compound/or a polymer containing chiral units of the second formula given in claim 2
Claim 5
Dependent Claim 16 words
A polymer phase as claimed in any of claims 1 to 3, wherein R 3 is
Claim 6
Dependent Claim 16 words
A polymer phase as claimed in any of claims 1 to 3, wherein R 3 is
Claim 7
Dependent Claim 14 words
A polymer phase as claimed in claim 2 or 3, wherein R 4 is
Claim 8
Dependent Claim 14 words
A polymer phase as claimed in claim 2 or 3, wherein R 4 is
Claim 9
Dependent Claim 70 words
A process for the preparation of a polymer phase as claimed in claim 1 or 2, wherein a monomer of the formula where R 1 , R 3 and n have the meanings given in claim 1, and a monomer of the formula where R 1 , R 4 and n have the same meanings as in the second formula of claim 2, are copolymerized by a free radical mechanism.
Claim 10
Dependent Claim 45 words
A process for the preparation of a polymer phase as claimed in claim 1 or 3, wherein a mixture is prepared from a nematogenic polymer having the units given in claim 1, and a low molecular weight chiral compound or a polymer containing chiral units.
Claim 11
Dependent Claim 21 words
The use of a polymer phase as claimed in any of claims 1 to 9 in the field of information storage.
Claim 12
Dependent Claim 19 words
The use of a polymer phase as claimed in any of claims 1 to 9 as a coating material.
Claim 13
Dependent Claim 24 words
The use of a polymer phase as claimed in any of claims 1 to 9 for the production of polarization filters and selective reflectors.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag