Biological polysiloxanes

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 77/04 (2006.01) A61L 27/14 (2006.01) C08G 77/20 (2006.01) C08G 77/38 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2651706

The present invention relates to a macromonomer having a polydimethylsiloxane backbone that has a mol% dimethyl siloxanes, b mol% siloxanes substituted with -K-RIM, c mol% siloxanes substituted with -K-RIM-Z and d mol% siloxanes substituted with -L-Z, and in which the terminal siloxane groups are tri-substituted with R, wherein RIM is a refractive index modifying group; Z is a free radically polymerisable group; K is a spacer group; L is optional and is a spacer group; each R is independently selected from an RIM, a lower alkyl group, hydrogen or Z; and a is a molar percentage of the macromonomer which is in the range of from 0 to 95 mol %; b is a molar percentage of the macromonomer which is in the range of from 5 to 99 mol %; c is a molar percentage of the macromonomer which is in the range of from 0 to 2 mol %; and d is a molar percentage of the macromonomer which is in the range of from 0 to 2 mol %; with the proviso that c and d are not both 0 mol %.

La présente invention concerne un macromonomère ayant un squelette de polydiméthylsiloxane qui comprend a % en moles de diméthyl siloxanes, b % en moles de siloxanes porteurs de substitutions -K-RIM, c % en moles de siloxanes porteurs de substitutions -K-RIM-Z et d % en moles de siloxanes porteurs de substitutions -L-Z, et dans lequel les groupes siloxane terminaux portent trois substitutions R. Selon l'invention, RIM est un groupe qui modifie l'indice de réfraction ; Z est un groupe polymérisable par radicaux libres ; K est un groupe intercalaire ; L est un groupe intercalaire facultatif ; chaque R est choisi indépendamment parmi un RIM, un groupe alkyle inférieur, un hydrogène ou Z ; a est un pourcentage molaire du macromonomère qui est dans la plage de 0 à 95 % en moles ; b est un pourcentage molaire du macromonomère qui est dans la plage de 5 à 99 % en moles ; c est un pourcentage molaire du macromonomère qui est dans la plage de 0 à 2 % en moles ; et d est un pourcentage molaire du macromonomère qui est dans la plage de 0 à 2 % en moles ; à condition que c et d ne soient pas tous les deux égaux à 0 % en moles.

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