Liquid-crystalline silicones having increased UV stability

US6358574B1 · kind B1 · utility

Assignee

• Consortium für elektrochemische Industrie GmbH · DE

Inventors

• Norman Haberle · Munich, DE
• Jurgen Kupfer · Berlin, DE
• Horst Leigeber · Oberhaching, DE

Key dates

• Filing date: Dec 6, 1999
• Grant date: Mar 19, 2002
• Expiry date: Dec 6, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K2323/053
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Crosslinkable LC organosiloxanes exhibiting excellent UV stability, contain units of the general formula 1[RbMescSiO(4−b−c)/2]  (1)in whichR are C1-C4-alkyl radicals,Mes is at least one group of the general formula 2 and, if desired, of the general formula 3,b has the value 0, 1 or 2, andc has the value 0, 1, 2, 3 or 4,with the proviso that the sum of the values of b and c is a maximum of 4, where the Mes groups of the general formulae 2 and 3 exhibit the following structure:—(CH2)p—(O)q—A—[B—A]r—E—F—VN  (2)—(CH2)m—(O)n—(A)t—Q—X  (3)in whichA, B, Q, X, E, F, VN, m, p, n, q, t and r have the meanings given in claim 1, with the proviso that the LC organosiloxanes do not constitute a phenyl ester derivative of an aliphatic, aromatic or heteroaromatic carboxylic acids.