EP0350113A1
Expired / Lapsed
EP
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Liquid crystalline polyesters
Assignee: Akzo Nobel NV
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Filing: 1989-06-30
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Granted: —
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Expires: 2009-06-30
Abstract
Abstract Liquid crystalline side-chain polyesters prepared by polycondensing a dicarboxylic acid or a derivative thereof with a diol of the formula according to claim 1. Of such diols the essence is that they have a delocalized π electron system to which both an electron donor group and an electron acceptor group are coupled directly (DπA-system). Because of the structure of the diol to which the DπA-system is linked the polyesters exhibit excellent Tg and Tc values. The polyesters are to be used in optical waveguides or for optical data storage.
Inventors
- 👤 Carel Theodoor Jozef Wreesmann
- 👤 Erwin Wilhelmus Petrus Erdhuisen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 16:01
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/361; G02F1/3615; G02F1/3617; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3819; C08G18/384; C08G18/67; C08G18/675; C08G18/677; C08G18/678; C08G63/00; C08G63/68; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3833; C09K19/3838; G11; G11B; G11B7/00; G11B7/24; G11B7/241; G11B7/242; G11B7/244; G11B7/245; G11B7/25
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
A polyester obtained by polycondensing a dicarboxylic acid or a derivative thereof with a diol of the formula: wherein R₁ = halogen, R₂, OR₂, COR₂, COOR₂, CN or CF₃; R₂ = H or an alkyl group having 1-3 carbon atoms; Y = CR₂, C-CN, or N; A = CN, NO₂, CH=C(CN)₂, C(CN)₂, or CF₃; n = 0-4. x = 0-6
Claim 2
Dependent Claim
60 words
A polyester obtained by polycondensing a dicarboxylic acid or a derivative thereof with a diol of the formula: wherein R₁ = halogen, R₂, OR₂, COR₂, COOR₂, CN or CF₃; R₂ = H or an alkyl group having 1-3 carbon atoms; Y = CR₂, C-CN, or N; A = CN, NO₂, CH=C(CN)₂, C(CN)₂, or CF₃; n = 0-4. x = 0-6
Claim 3
Dependent Claim
20 words
A polyester according to claim 1, characterized in that the dicarboxylic acid or derivative thereof is substantially an aliphatic diacid.
Claim 4
Dependent Claim
31 words
A polyester according to claim 1, characterized in that the dicarboxylic acid derivative is adipoyl or glutaryl chloride and the diol is of the formula wherein A₁ = CN or NO₂
Claim 5
Dependent Claim
17 words
An optical waveguide, characterized in that it is of a polyester according to claim 1, 2 or3.
Claim 6
Dependent Claim
21 words
A medium for optical data storage, characterized in that it is of a polyester according to claim 1, 2 or 3.
References Cited (Backward Citations)
EP0194747A2
Cited
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