Browse Prior Art Database

Correlation between solid content and viscosity of a polymerizable cholesteric liquid crystal formulation

IP.com Disclosure Number: IPCOM000227585D
Publication Date: 2013-May-08
Document File: 3 page(s) / 136K

Publishing Venue

The IP.com Prior Art Database

Related People

Seeger, Oliver: AUTHOR

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 59% of the total text.

Page 01 of 3

Authors: Dr. Jochen Brill, Thomas Musiol, Dr. Oliver Seeger

Address: BASF SE, 67056 Ludwigshafen

Key words: Cholesteric liquid crystals, viscosity, printing

Full text: The correlation between the solid content and the viscosity of a polymerizable cholesteric liquid crystal formulation was investigated. The formulation allows to control the viscosity in a wide range between 10 and 160 mPa x s. Independently from the viscosity chosen an excellent orientation of the liquid crystals can be achieved.

The wide range of viscosity allows various printing and coating technologies including inkjet-, flexo-, gravure- and screen printing as well as all types of roll- or reverse roll coaters, knife coater and knife reverse roll coater (krrc).

Formulation: nematic monomer Ib in WO 2009/153287 chiral dopant IVa in WO 2009/153287 Photoinitiator Lucirin TPO

BYK 361 N (1%) in solvent

Cyclopentanone

between 40% and 67% ( with

respect to the total solid content)

The following ratios solvent : solid content were formulated by mixing all components at room temperature with a magnetic stirrer until a clear solution was obtained

Cyclopentanone : Solid content

67% 33% 60% 40% 50% 50% 47% 53% 44% 56% 40% 60%

All formulations were measured with a haake mars rheometer (Cone C60/1°H, D=60mm).

95%

5%

5% of solid content (with respect to

the sum of nematic and chiral dopant)

0,05% of solid content (with respect

to the sum of nematic and chiral dopant)


Page 02 of 3

The cholesteric liquid crys...