Photo-induced optically anisotropic amorphous film materials from side group polymers

US5543267A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Joachim Stumpe · Berlin, DE
• Valery Shibaev · Moscow, RU
• Sergei Kostromin · Moscow, RU
• Sergei Ivanov · Moscow, RU
• Thomas Fischer · Graz, AT
• Lutz L asker · Berlin, DE
• Ralf Ruhmann · Berlin, DE
• Uwe Claussen · Leverkusen, DE

Key dates

• Filing date: Mar 21, 1994
• Grant date: Aug 6, 1996
• Expiry date: Mar 21, 2014

Classification

• Technology area (CPC G): Physics
• CPC primary: G11B7/245
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Flat materials made from a polymer with a backbone and side groups branching off the backbone (side group polymer), which polymer has the following structural features (1) to (3): PA1 (1) the side group polymer contains at least one photoinducibly configuration-changing side group; PA1 (2) the side group polymer contains at least one permanently conformationally anisotropic side group with high anisotropy of molecular polarisability which differs from (1); PA1 (3) the side group polymer contains flexible spacer groups between the backbone and the side groups (1) and (2); wherein the flat material in the glassy state of the side group polymers is optically isotropic, transparent, non-scattering and amorphous before irradiation and, after irradiation, is transparent and durably birefringent and dichroic due to a reversible, photoinduced alignment of the side groups (1) and (2) in the glassy state, may be purposefully modified in terms of their optical properties by the action of light.