Temporary protective layer on polymeric articles

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 5/00 (2006.01) B29C 63/00 (2006.01) B29D 11/00 (2006.01) G02B 1/04 (2006.01) G02B 1/10 (2006.01)

Patent

CA 2372460

The temporary protection of polymeric articles, particularly polymeric articles with optical qualities such as ophthalmic lenses formed by the lamination of individual lens blanks, can be effected by the application of protective polymeric compositions to the surface of the polymer article, the composition being applied as a dry film or coating a film on a surface of the polymeric article. The individual lens blank is prepared for lamination or coating by application of a selective solvent to the polymeric film, the selective solvent dissolving, dispersing or otherwise removing the protective polymeric film but neither reacting with, etching or dissolving the composition of the polymeric article. The solvent even may comprise water or aqueous solutions (especially pH 8.0 to 12), although C1 to C5 alcohols and alkylene glycol ethers may also be used as the solvent.

La protection temporaire d'articles polymères, en particulier d'articles polymères présentant des qualités optiques tels que des lentilles ophtalmiques formées par superposition de palets distincts, peut être effectuée soit par application de compositions polymères protectrices sur la surface d'un article polymère, ladite composition étant appliquée comme un film sec, soit par application d'un film sur la surface dudit article polymère. Avant superposition ou enrobage, chaque palet est préparé par application d'un solvant sélectif sur le film polymère. Ledit solvant sélectif dissout, disperse ou encore ôte le film polymère protecteur, mais jamais il ne réagit à la composition dudit article polymère, ni ne l'attaque ou la dissout. En outre, le solvant peut contenir de l'eau ou des solutions aqueuses (en particulier avec un pH allant de 8,0 à 12), toutefois, on peut également utiliser les alcools C1 à C5 et les éthers de glycol alkylène comme solvant.

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