Method of deblocking, extracting and cleaning polymeric...

B - Operations – Transporting – 29 – C

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B29C 37/00 (2006.01) B08B 3/10 (2006.01) B08B 7/00 (2006.01) B29C 71/00 (2006.01) B29D 11/00 (2006.01)

Patent

CA 2211023

Methods of deblocking a polymeric article from a mold and/or removing undesirable materials from a polymeric article by applying supercritical fluids to the polymeric article are disclosed. A preferred process is the treatment of ophthalmic lenses, such as contact lenses (16). Supercritical fluid, composed primarily of carbon dioxide, is applied to a contact lens (16) affixed to a mold (18) subsequent to the polymerization step. The application of supercritical fluid (SCF) causes the lens to efficiently and consistently separate from the mold, removes undesirable materials such as unreacted monomer oligomers, or residual solvents from the lens core, and/or cleans the lens surface of adhered debris.

On divulgue des méthodes pour dégager un objet en polymère d'un moule et/ou pour enlever les matières jugées indésirables d'un objet en polymère par l'application de fluides supercritiques sur l'objet en polymère. Une application de choix est le traitement des lentilles ophtalmiques, comme les lentilles cornéennes (16). Le fluide supercritique, composé principalement de dioxyde de carbone, est appliqué sur la lentille cornéenne (16) prise dans un moule (18) après l'étape de polymérisation. L'application du fluide supercritique entraîne une séparation efficace et constante de la lentille du moule, élimine les matières jugées indésirables comme les oligomères monomériques n'ayant pas réagi ou les solvants résiduels présents dans la masse de la lentille et/ou nettoie la surface de la lentille des débris qui y adhèrent.

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