High refractive index polysiloxanes and their preparation

Details High refractive index polysiloxanes and their preparation High refractive index polysiloxanes and their preparation

C - Chemistry, Metallurgy

08

G

C08G 77/04 (2006.01) C07F 7/12 (2006.01) C08G 77/06 (2006.01) C08G 77/24 (2006.01) C08G 77/38 (2006.01) C08G 77/385 (2006.01) C09D 183/04 (2006.01) C09D 183/08 (2006.01) G02B 1/04 (2006.01) G02B 1/11 (2006.01)

Patent

CA 2455331

A high refractive index polysiloxane includes siloxane T units of the formula (I) where A represents an alkylene group having 1 to 4 carbon atoms: n=O or 1; m is at least 1; and Ar is an aryl group substituted by at least one iodine, bromine or chlorine atom, or is a polynuclear aromatic group. The invention includes chlorosilanes having the formula (Ar)m-(A)nSiCl3, useful in forming high refractive index polysiloxanes.

L'invention concerne des polysiloxanes à indice de réfraction élevé comprenant des unités de siloxane T représentées par la formule (I). Dans cette formule, A représente un groupe alkylène comprenant 1 à 4 atomes de carbone; n = 0 ou 1; m est au moins égal à 1; et Ar représente un groupe aryle substitué par au moins un atome d'iode, de brome ou de chlore, ou représente un groupe aromatique polynucléaire. L'invention concerne également des chlorosilanes représentés par la formule (Ar)m-(A)nSiCl3 utilisés pour former des polysiloxanes à indice de réfraction élevé.

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