Process for applying a coated or uncoated film on a lens...

B - Operations – Transporting – 29 – D

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B29D 11/00 (2006.01) G02B 1/10 (2006.01)

Patent

CA 2695938

A process for applying a coated or uncoated film onto a surface of a lens substrate which comprises the steps of : providing a liquid hot melt adhesive (HMA) com-position comprising: a HMA base polymer and a polymerizable monomer or oligomer applying the liquid HMA composition onto either the surface of a film or a lens substrate drying the applied liquidHMA composition moving the film and the lens substrate rela-tively to each other to bring them into contact applying pressure on the film; heating to reach a Tmax process Temperature at or above the glass transition temperature (Tg), the monomers or oligomers being liquid at the Tmax process temperature and polymerizing the monomers or oligomers while maintaining pressure and heating.

L'invention porte sur un procédé d'application d'un film recouvert ou non sur la surface d'un substrat de lentille, ledit procédé comprenant les étapes suivantes : fourniture d'une composition d'adhésif thermofusible (HMA) comprenant un polymère de base HMA et un monomère ou un oligomère polymérisable, l'application de la composition HMA liquide sur la surface d'un film ou sur un substrat de lentille, le séchage de la composition HMA liquide appliquée par déplacement du film et du substrat l'un par rapport à l'autre jusqu'à les mettre en contact, l'application d'une pression sur le film; le chauffage jusqu'à une température de traitement Tmax supérieure ou égale à la température de transition vitreuse (Tg), les monomères ou les oligomères étant liquides lorsque cette température Tmax est atteinte, et enfin la polymérisation des monomères ou oligomères tout en maintenant la pression et le chauffage.

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