US 7,607,919 B2 · Magnetic substance display panel

Abstract

A magnetic display panel that excels in display and erasure performance, being free from any change of writing and display performance even upon repetition of display and erasure and that facilitates inhibition of thixotropic property and specific gravity control for dispersion medium vs. magnetic display substance, etc., ensuring low toxicity and low pollution. In particular, a magnetic substance display panel comprising a dispersion with yield value composed mainly of a magnetic display substance, water and an aqueous thickener and a support holding the dispersion, characterized in that the aqueous thickener is at least one member selected from among a crosslinked acrylic acid copolymer, a crosslinked maleic anhydride copolymer, a thickening polysaccharide and a polyvinylalkylamide.

Claims2

Dependent claims

A magnetic display panel comprising:

a dispersion liquid and
a supporting member for holding said dispersion liquid,
wherein said dispersion liquid is a dispersion liquid, having a yield value, whose principal components are magnetic display materials in fine particle form, water as a dispersion medium, and a thickener for an aqueous system, and
wherein said thickener for an aqueous system comprises one or more members selected from the group consisting of a cross-linking type maleic anhydride copolymer and a polyvinyl alkyl amide.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

10/544,643Filed 5 Feb 2004

Priority

JP 2003-0301576 Feb 2003

Published

US 2006/0246413 A12 Nov 2006

Granted

27 Oct 2009

Term ends

Not estimatedThe source records don’t support an estimate.

Classification3 codes

G02F 1/172
Based on variable-absorption elements not provided for in groups G02F1/015 - G02F1/169: based on a suspension of orientable dipolar particles,…
G02F 1/09
For the control of the intensity, phase, polarisation or colour: based on magneto-optical elements, e.g. exhibiting Faraday effect
G02F
Optical devices or arrangements for the control of light by modification of

Magnetic substance display panel

Life of this patent

Magnetic substance display panel

Life of this patent

Abstract

Claims2