Patent · US Expired

Homopolymers with high photoinduceable double refraction

US6441113B1 · kind B1 · utility

2Cited by

5References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Horst Berneth · Leverkusen, DE
Uwe Claussen · Leverkusen, DE
Serguei Kostromine · Rheinbach, DE
Ralf Neigl · Leverkusen, DE
Hans-Joachim Vedder · Puchheim, DE

Key dates

Filing date	Nov 8, 1999
Grant date	Aug 27, 2002
Priority date	—
Expiry date	Nov 8, 2019

Classification

Technology area (CPC G)Physics
CPC primaryG11C13/042
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A homopolymer formed from monomers which contain groupings which are at least trinuclear, which are capable of absorbing the electromagnetic radiation of visible light, and which are structured so that in their thermodynamically stable state they are distended and strongly anisometric, is disclosed. The trinuclear groups of the homopolymer include at least one electron-attracting substituent which gives rise to a dipole moment which forms an angle of at least 20° with the longitudinal axis of the trinuclear groups. The homopolymer contains covalently bonded side groups branching from the backbone represented by the following formula,—§—T—Q—E.In the formula: § represents one of oxygen, sulphur and NR1; T represents a (CH2)n radical, optionally interrupted by, for example, —O—; Q represents a divalent linking group; and E represents the trinuclear group, e.g., represented by the following formula (VII),

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.