3.
    发明专利
    未知

    公开(公告)号:FR2673576A1

    公开(公告)日:1992-09-11

    申请号:FR9102827

    申请日:1991-03-08

    Applicant: ESSILOR INT

    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. … …

Patent Agency Ranking