Polymerisable monomer compositions, transparent polymer...

C - Chemistry – Metallurgy – 08 – F

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C08F 222/10 (2006.01) C08F 220/28 (2006.01) C08F 220/30 (2006.01) C08F 290/06 (2006.01) C08G 65/332 (2006.01) C08L 71/02 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2264906

The invention concerns polymerisable monomer compositions, transparent polymer substrates, and resulting optical and ophthalmologic articles, comprising 30 to 100 % of monomers of formula: (I) in which: R?1¿, R?2¿, R' and R" represent, independently of one another, a hydrogen atom or a methyl radical, R¿a? and R¿b?, identical or different, represent each a C¿1?-C¿10? alkyl group, provided that R¿a? and R¿b? do not simultaneously represent a methyl group and m and n are whole numbers satisfying the relationship 2 ? m + n ? 20; 0 to 70 % of at least another polymerisable monomer (II) comprising one or several (meth)acrylate functions, different from monomer (I), such that a transparent substrate resulting from polymerisation of the composition has a glass transition temperature satisfying the relationship 70 ·C ? Tg ? 110 ·C; and at least a polymerisation priming system. The invention is applicable to the manufacture of optical and ophthalmologic articles.

Les compositions selon l'invention comprennent 30 à 100 % d'un ou plusieurs monomères de formule (I), dans laquelle R1, R2, R' et R'' représentent, indépendamment les uns des autres, un atome d'hydrogène ou un radical méthyle, Ra et Rb, identiques ou différents, représentent chacun un groupe alkyle ayant 1 à 10 atomes de carbone, à la condition que Ra et Rb ne représentent pas simultanément un groupe méthyle et m et n sont des entiers satisfaisant à la relation 2 m + n 20; 0 à 70 % d'au moins un autre monomère polymérisable (II) comportant une ou plusieurs fonctions (méth)acrylate, différent du monomère (I), tel qu'un substrat transparent résultant de la polymérisation de la composition ait une température de transition vitreuse satisfaisant à la relation 70 ~C Tg 110 ~C; et au moins un système d'amorçage de la polymérisation. Application à la fabrication d'articles d'optique et ophtalmiques.

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