Liquid-crystalline silicones having increased uv stability

Details Liquid-crystalline silicones having increased uv stability Liquid-crystalline silicones having increased uv stability

C - Chemistry, Metallurgy

08

G

C08G 77/442 (2006.01) C08G 77/38 (2006.01)

Patent

CA 2292138

Crosslinkable LC organosiloxanes exhibiting excellent UV stability, contain units of the general formula 1 [R b Mes c SiO(4-b-c)/2] in which R 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, and c 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 which A, 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.

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