Process for producing plastic lens and apparatus for producing plastic lens

A process for producing a plastic lens comprising:

• a step of stirring and mixing a solution including a polymerization reactive compound in a preparation tank;
• a step of transferring a polymerizable composition obtained in the step from the preparation tank to a lens casting mold;
• a step of curing the polymerizable composition;
• and
• a step of separating a cured resin from the lens casting mold to obtain a plastic lens molded product,
• wherein the step of transferring the polymerizable composition includes a step of re-mixing the polymerizable composition discharged from the preparation tank and injecting the polymerizable composition into the lens casting mold,
• wherein the solution in the preparation tank further includes a polyether-modified compound which is at least one compound selected from a polyether-modified siloxane compound represented by General Formula (1a) and a polyether-modified (meth)acrylic compound represented by General formula (3a):
• wherein R1 to R8 may be the same as or different from each other and at least one of R1 to R8 is a polyether group represented by following General Formula (4a), and the other R1 to R8 may be the same as or different from each other and are a linear or branched alkyl group having 1 to 20 carbon atoms, a linear or branched alkoxy group having 1 to 20 carbon atoms, a hydroxyl group, or a polysiloxy group, a plurality of present R2 to R5 may each be the same as or different from each other, m and n may be the same as or different from each other and are an integer equal to or more than 0,
• R25—OkR26 (4a)
• wherein, in General Formula (4a), R25 represents a linear or branched alkylene group having 1 to 20 carbon atoms, R26 represents a hydrogen atom or a linear or branched alkenyl group having 2 to 20 carbon atoms, a plurality of present R25's may be the same as or different from each other, and k is an integer equal to or more than 1, and
• wherein R17 to R24 may be the same as or different from each other, and at least one of R17 to R24 is a polyether group represented by General Formula (4a), and at least one of R17 to R24 is a (meth)acryloyl group or a linear or branched alkyl group having 1 to 20 carbon atoms and having a (meth)acryloyl group, and the other R17 to R24 represent a linear or branched alkyl group having 1 to 20 carbon atoms, and a plurality of present R18 to R21 may each be the same as or different from each other, v and w may be the same as or different from each other and represent an integer equal to or more than 0,
• wherein the polyether-modified siloxane compound represented by General Formula (1a) is combination of a compound in which R26 of the General Formula (4a) is a hydrogen atom and a compound in which R26 of the General Formula (4a) is a linear or branched alkenyl group having 2 to 20 carbon atoms,
• wherein the polymerization reactive compound is at least one compound selected from the group consisting of a polyiso(thio)cyanate compound, a (thio)epoxy compound, an oxetanyl compound, a thietanyl compound, a bifunctional or higher active hydrogen compound, and an acid anhydride.