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    41.
    发明专利
    未知

    公开(公告)号：DE3862171D1

    公开(公告)日：1991-05-02

    申请号：DE3862171

    申请日：1988-06-17

    Applicant: ESSILOR INT

    Inventor： BOURSET CLAUDE ,  WAJS GEORGES

    IPC: B29C35/12 ,  B29D11/00 ,  B29K96/00 ,  B29L11/00 ,  G02C7/04

    Abstract: In this method of manufacturing a flexible contact lens from a protein biological material, such as a protein polymer of the gelatine type or a type IV enriched human collagen, a hydrogel is first made by hydrating the protein biological material, in water or a physiological serum. A lens preform is then made from the hydrogel at a temperature between ambient temperature and the temperature at which the material liquefies, at which temperature the hydrogel has a paste-like consistency. This preform, which reproduces the shape of the finished lens with a greater or lesser degree of accuracy, but always with excess material, is then placed in a mold made from a low-loss dielectric material. The mold is in at least two parts which, when locked together, define a three-dimensional shape and a finished lens surface state. The hydrogel is then liquefied by irradiating the mold with an electromagnetic field at a frequency between 108 and 1010 Hz. The parts of the mold are then locked together and the hydrogel is then gelified by cooling it in the mold. Finally, the hydrogel is then removed from the mold and is cross-linked by contact with a cross-linking agent such as an aldehyde. The resulting lenses have excellent shape and surface state characteristics and are very well tolerated biologically.

    42.
    发明专利
    未知

    公开(公告)号：FR2649397A1

    公开(公告)日：1991-01-11

    申请号：FR8909193

    申请日：1989-07-07

    Applicant: ESSILOR INT

    Inventor： YEAN LEANIRITH ,  WAJS GEORGES ,  MARTIN GERARD ,  GUERRERO PATRICK

    IPC: G01N21/41 ,  B01J4/00 ,  C08F2/00 ,  C08F2/02 ,  C08F18/14 ,  C08F18/24 ,  C08F218/00 ,  C08F263/00 ,  G02B1/04 ,  G02C7/02

    Abstract: The process according to the invention is of the kind according to which an additive substance (11) is diffused in a controlled manner within a base substance (10) which, made up of at least one partially polymerised monomer capable of resulting in a homopolymer of refractive index N1, is in the state of a gel, the additive substance itself being made up of at least one monomer capable of producing a homopolymer of refractive index N2 which differs from N1. According to the invention the additive substance (11) chosen is a mixture of at least two monomers (A, B) and the composition of this mixture is varied with time. Application to the production of components made of synthetic substance of optical quality suited especially to the production of ophthalmic lenses.

    48.
    发明专利
    未知

    公开(公告)号：DE69203010T2

    公开(公告)日：1996-01-04

    申请号：DE69203010

    申请日：1992-03-05

    Applicant: ESSILOR INT

    Inventor： YEAN LEANIRITH ,  WAJS GEORGES ,  MARTIN GERARD ,  GUERRERO PATRICK

    IPC: C08L101/00 ,  B29D11/00 ,  G02B1/04 ,  G02B3/00 ,  G02C7/02

    Abstract: This procedure is of the kind in which the absorption, by a base-polymer material, of an additive composition enclosing at least one monomer capable of leading to a polymer of different refractive index is ensured. … According to the invention, by choosing a swelling composition as the additive composition, a first preform (P1) is produced, with a first geometry (G1), from a polymer material at a rate of advance sufficient for it to be self-supporting, a confinement volume (14) is defined between this first preform and an abutment element having a second geometry (G2) corresponding to a greater volume, and it is brought into contact there with a quantity of swelling additive composition sufficient for the swelling, to which it is then subjected, to cause it to match, under stress, this second geometry (G2). … Application, especially, to the production of ophthalmic lenses. … …

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