Precision composite article

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/16 (2006.01) G02B 1/04 (2006.01) G02C 7/02 (2006.01) G02C 7/04 (2006.01) B32B 27/00 (2006.01)

Patent

CA 2400437

The invention is directed to a method for making composite articles, including optical lenses, which includes the steps of obtaining a substrate; placing a semi-solid-like polymerizable composition in contact with at least one of the front or back surface of the substrate; compressing or heating the resulting semi-solid/substrate sandwich between two mold halves, where the mold contacting the semi-solid polymerizable material has a desired surface geometry; and exposing the semi-solid/substrate sandwich to a source of polymerizing energy. The resulting composite article has the desirable characteristics of the substrate but is also easily fabricated as a result of the semi-solid molding process. Also included within the present invention is a composite article comprising a substrate portion and at least one layer of a cured resin bonded to the substrate portion, the cured resin comprising an interpenetrating crosslinked polymer network of reactive plasticizer within a dead polymer. In one embodiment, the reactive plasticizer polymer network is further crosslinked to the dead polymer. The composite article exhibits dimensional stability and high-fidelity replication of an internal mold cavity.

La présente invention concerne un procédé de fabrication d'articles composites, y compris des lentilles optiques, selon lequel : on forme un substrat ; on place une composition polymérisable de type semi-solide en contact avec au moins la surface antérieure ou la surface postérieure du substrat ; on comprime ou on chauffe le sandwich semi-solide/substrat obtenu entre deux moitiés de moules, le moule en contact avec la matière polymérisable semi-solide possédant une géométrie de surface désirée ; et on expose le sandwich semi-solide/substrat à une source d'énergie polymérisante. L'article composite obtenu possède les caractéristiques désirables du substrat, mais il est également facile à fabriquer grâce au processus de moulage semi-solide. L'invention se rapporte également à un article composite comprenant une partie substrat et au moins une couche d'une résine durcie liée à la partie substrat, la résine durcie comprenant un alliage IPN de plastifiant réactif au sein d'un polymère inerte. Dans un mode de réalisation, l'alliage IPN polymère-plastifiant réactif est encore réticulé avec le polymère inerte. L'article composite obtenu offre une stabilité dimensionnelle et une reproduction hautement fidèle de la cavité interne du moule.

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