Cationic photopolymerization of diepisulfides and application to the manufacture of optical lenses
AssigneeEssilor International (Compagnie Generale d'Optique)
InventorsSirisoma Wanigatunga, Yassin Turshani
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Abstract
A process for polymerizing/curing a photopolymerizable monomer composition comprising at least one diepisulfide monomer which comprises the steps of: a) mixing to the monomer composition an effective amount of a cationic photopolymerization initiator, and b) irradiating the mixture of a) with an ultraviolet radiation to at least partially cationically photopolymerize the monomer composition.
Claims43
A process for polymerizing/curing a monomer composition comprising at least one diepisulfide monomer which comprises the steps of:
- a) mixing to the monomer composition an effective amount of a cationic photopolymerization initiator,
- b) preheating the mixture to a temperature ranging from 50° C. to 100° C.;
- c) irradiating the preheated mixture to partially polymerize the monomer composition;
- and
- d) heating the partially polymerized monomer composition at a temperature ranging from 30° C. to 100° C. for 1 to 5 hours to complete polymerization of the monomer composition.
A process for making a plastic lens comprising the steps of:
- a) pouring in a mold a photopolymerizable monomer composition including at least one diepisulfide monomer and at least one cationic photopolymerization initiator;
- b) preheating the photopolymerizable monomer composition to a temperature ranging from 50° C. to 100° C.;
- c) irradiating the photopolymerizable monomer composition with a UV radiation to partially polymerize the composition;
- d) heating the partially polymerized composition at a temperature ranging from 30° C. to 100° C. for a predetermined time to complete polymerization;
- and
- e) recovering the plastic lens from the mold.
A process for polymerizing/curing a photopolymerizable monomer composition comprising at least one diepisulfide monomer and at least one solvent which comprises the steps of:
- (a) mixing to the monomer composition an effective amount of a cationic photopolymerization initiator, and
- (b) irradiating the mixture of (a) with an ultraviolet radiation to at least partially cationically photopolymerize the monomer composition.
A process for polymerizing/curing a photopolymerizable monomer composition comprising at least one diepisulfide monomer and at least one solvent which comprises the steps of:
- (a) mixing to the monomer composition an effective amount of a cationic photopolymerization initiator, and
- (b) irradiating the mixture of (a) with an ultraviolet radiation to at least partially cationically photopolymerize the monomer composition,
- wherein the diepisulfide monomer is selected from diepisulfides of formula:
- in which R1 and R2 are, independently from each other, H, alkyl, aryl, alkoxy, aryloxy, alkylthio or arylthio;
- R3 and R4 are, independently from each other,
- n is an integer from 0 to 4 and m is an integer from 0 to 6, and Ra designates H, alkyl, aryl, alkoxy, aryloxy, alkylthio or arylthio.
Dependencies are inferred from the claim text.