Patent · US Expired

Liquid crystalline cellulose (ether) ethers as interferentially effective chromophoric substances

US5814141A · kind A · utility

3Cited by

12References

29Claims

0Family size

Assignee

Daimler-Benz AG · DE

Inventors

Martin Kirschbaum · Ulm, DE
Maria-Theresia Sailer · Ulm, DE
Fritz Dannenhauer · Hasel, DE
Hartmut Seliger · Neu-Ulm, DE

Key dates

Filing date	Nov 27, 1996
Grant date	Sep 29, 1998
Priority date	—
Expiry date	Nov 27, 2016

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09K19/3819
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The invention relates to a liquid crystalline, photo cross-linkable main-chain polymer used as interferentially effective, chromophoric substance for colored paints, in which the main mesogenic groups are disposed at least approximately in a chiral-nematic manner. An etherified cellulose ether or a mixture of several etherified cellulose ethers is used pursuant to the invention as liquid crystalline main-chain polymer or polymers wherein: PA1 the cellulose ethers have a molecular weight of 500 to 1,000,000, PA1 the anhydroglucose units of the cellulose ethers are etherified with an average degree of molar substitution of 2 to 7 with propylene oxide or ethylene oxide units (C.sub.3 H.sub.6 O- or C.sub.2 H.sub.4 O-units), and PA1 the cellulose ethers are etherified with an average degree of molar substitution of 1.5 to 3 with unsaturated hydrocarbon groups (C.sub.r H.sub.2r-1).

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