公开(公告)号：FR2790264A1

公开(公告)日：2000-09-01

申请号：FR9902437

申请日：1999-02-26

Applicant: ESSILOR INT

Inventor： MAISONNIER SYLVETTE ,  TARDIEU PASCALE ,  CANO JEAN PAUL ,  WAJS GEORGES ,  VAIRON JEAN PIERRE ,  CHARLEUX BERNADETTE

IPC: C08F2/44 ,  G02B5/23 ,  C09K9/02 ,  C08F20/10 ,  G02B1/04 ,  G02B1/10 ,  G02C7/10

Abstract: The invention concerns a method for preparing a latex consisting in: preparing an aqueous emulsion (I) of a composition (A) comprising: at least an organic monomer Z with a C=C group, capable of free radical polymerisation, and one or several organic photochromic compound(s); and (2) polymerisation in the presence of a water-soluble initiator of composition A of organic monomer(s) to obtain said latex with photochromic properties. The invention is useful in ophthalmic optics.

公开(公告)号：FR2731226A1

公开(公告)日：1996-09-06

申请号：FR9502520

申请日：1995-03-03

Applicant: ESSILOR INT

Inventor： CANO JEAN PAUL ,  WEBER STEVEN ,  TARDIEU PASCALE ,  LELARD NATHALIE

IPC: G02C7/02 ,  B29C35/02 ,  B29C39/02 ,  B29C39/42 ,  B29C71/02 ,  B29D11/00 ,  B29L11/00 ,  C08F2/00 ,  C08F2/38 ,  C08F2/48 ,  C08F2/50 ,  C08F20/30 ,  G02B1/04 ,  G02B1/10 ,  G02C7/10 ,  B32B5/14 ,  B32B27/30

Abstract: A method wherein (a) a polymerisable composition (8) consisting of transparent organic glass is fed into a mould; (b) the composition is polymerised under such conditions that the resulting transparent organic glass substrate has at least one thin surface layer (10) polymerised with a degree of completion and/or cross-linking that is substantially lower than in the rest (9) of the substrate; and optionally (c) subjecting the substrate to thermal stress relief annealing. The method is useful for producing finished or semi-finished ophthalmic articles, particularly photochromic ophthalmic articles.