Abstract: An inflatable membrane apparatus (10) comprising (a) a fluid accumulator (11) having an upper and a lower face and a fluid entrance (12), said lower face being partly formed by an inflatable membrane (14), and (b) a trunconical part (15) projecting outwardly from the lower face of the accumulator whose greater base is closed by at least part of the inflatable membrane (14) and smaller base forms a circular opening, whereby, when pressurized fluid is introduced into the accumulator (11), deformation of the inflatable membrane (14) is guided by the trunconical part.

Abstract: A transparent, non elastomeric, high refractive index, impact resistant poly(thio)urethane/urea material comprising the reaction product of: a) at least one (?, ?)-diiso(thio)cyanate cycloaliphatic or aromatic polysulfide prepolymer, and b) at least one aromatic primary diamine, in an equivalent molar ratio amine function/iso(thio)cyanate function ranging from 0.5 to 2, wherein, said prepolymer and diamine are free from disulfide (—S—S—) linkage and wherein the (?, ?)-diiso(thio)cyanate polysulfide prepolymer is the reaction product of at least one cycloaliphatic or aromatic diiso(thio)cyanate and at least one (?, ?)-diol prepolymer.

Abstract: The invention concerns a process for making a coated optical lens blank free of visible fining lines which comprises: (ix) providing an optical article having at least one fined but unpolished geometrically defined main face; (x) providing a mold part having an internal and external surface; (xi) depositing on said main face of said optical article or on the internal surface of the mold part a requisit amount of a liquid curable coating composition; (xii) moving relatively to each other the optical article and the mold part to either bring the coating composition into contact with the main face of the optical article or into contact with the internal face of the mold part; (xiii) applying pressure to the mold part to spread the liquid curable coating composition on said main face and form a uniform liquid coating composition layer onto the main face; (xiv) curing the liquid coating composition layer; (xv) withdrawing the mold part; and recovering the free of visible fining lines coated optical article.

Abstract: A transparent, non elastomeric, high refractive index, impact resistant poly(thio)urethane/urea material comprising the reaction product of: a) at least one (?, ?)-diiso(thio)cyanate cycloaliphatic or aromatic polysulfide prepolymer, and b) at least one aromatic primary diamine, in an equivalent molar ratio amine function/iso(thio)cyanate function ranging from 0.5 to 2, wherein, said prepolymer and diamine are free from disulfide (—S—S—) linkage and wherein the (?, ?)-diiso(thio)cyanate polysulfide prepolymer is the reaction product of at least one cycloaliphatic or aromatic diiso(thio)cyanate and at least one (?, ?)-diol prepolymer.

Abstract: A transparent, non elastomeric, high index, impact resistant polythiourethane/urea material comprising the reaction product of: a) at least one (?, ?)-diiso(thio)cyanate cycloaliphatic or aromatic prepolymer having a number average molecular weight ranging from 100 to 3000 gmol?1, and b) at least one primary diamine, in an equivalent molar ratio amine function/iso(thio)cyanate function from 0.5 to 2, preferably from 0.90 to 1.10, wherein, said prepolymer and diamine are free from disulfide (—S—S—) linkage and at least one of the prepolymer or the diamine contains one or more S atoms in its chain.

Abstract: An inflatable membrane apparatus (10) comprising (a) a fluid accumulator (11) having an upper and a lower face and a fluid entrance (12), said lower face being partly formed by an inflatable membrane (14), and (b) a trunconical part (15) projecting outwardly from the lower face of the accumulator whose greater base is closed by at least part of the inflatable membrane (14) and smaller base forms a circular opening, whereby, when pressurized fluid is introduced into the accumulator (11), deformation of the inflatable membrane (14) is guided by the trunconical part.

Abstract: A process for transferring a coating onto at least one optical surface of a lens blank which comprises: providing a lens blank having at least one geometrically defined surface; providing a support having an internal surface bearing a coating and an external surface; depositing on said geometrically defined surface of said lens blank or said coating a pre-measured amount of a curable glue; moving relatively to each other the lens blank and the support to either bring the coating into contact with the curable glue or bring the curable glue into contact with the geometrically defined surface of the lens blank; applying a sufficient pressure onto the external surface of the support so that the thickness of a final glue layer after curing is less than 100 micrometers; curing the glue; and withdrawing the mold part to recover the lens blank with the coating adhered onto its geometrically defined surface.

Abstract: The present invention relates to an improved process or method for transferring a coating onto at least one surface of a lens blank which can be implemented in a short period of time without any risk of deformation of the lens blank.

Abstract: The present invention relates to room temperature or thermally polymerizable/curable episulfide based compositions for making polymerized/cured episulfide based resins, and in particular episulfide based compositions which can be fastly polymerized/cured, as well as to a room temperature or thermal polymerization process for making such episulfide based resins.

Abstract: A process for transferring a coating onto at least one optical surface of a lens blank which comprises:

Abstract: The present invention relates to an improved process or method for transferring a coating onto at least one surface of a lens blank which can be implemented in a short period of time without any risk of deformation of the lens blank.

Abstract: A transparent, non elastomeric, high index, impact resistant polythiourethane/urea material comprising the reaction product of:

Abstract: The present invention relates to room temperature or thermally polymerizable/curable episulfide based compositions for making polymerized/cured episulfide based resins, and in particular episulfide based compositions which can be fastly polymerized/cured, as well as to a room temperature or thermal polymerization process for making such episulfide based resins.

Abstract: The present invention relates to an improved process or method for transferring a coating onto at least one surface of a lens blank which can be implemented in a short period of time without any risk of deformation of the lens blank.

Abstract: The present invention relates to an improved process or method for transferring a coating onto at least one surface of a lens blank which can be implemented in a short period of time without any risk of deformation of the lens blank.