Ultraviolet-hardenable adhesive

An ultraviolet-hardenable adhesive used for bonding a non-water swellable, ophthalmic-lens blank to a support member, in producing a non-water swellable ophthalmic lens, the adhesive consisting essentially of:

• at least one photopolymerizing monomer;
• at least one separation-promoting monomer for promoting separation of the bonded lens and support member from each other;
• at least one photoinitiator;
• and
• at least one photosensitizer;
• said at least one photopolymerizing monomer being selected from the group consisting of acrylates or methacrylates represented by following general formulas (I) and (II):
• ##STR16## wherein R.sub.1 is hydrogen or methyl,
• R.sub.2 is hydrogen or methyl,
• R.sub.3 is hydrogen or methyl,
• m is a positive integer from 2 to 10, and
• n is a positive integer from 1 to 5;
• said at least one separation-promoting monomer being selected from the group consisting of ethylenically unsaturated compounds represented by a following general formula (III):
• ##STR17## wherein R.sub.4 is hydrogen or methyl,
• R.sub.5 is hydrogen or methyl, and
• l is a positive integer from 4 to 20;
• the adhesive containing 40 to 80 parts by weight of said at least one photopolymerizing monomer and 60 to 20 parts by weight of said at least one separation-promoting monomer, per 100 parts by weight of the sum of said at least one photopolymerizing monomer and said at least one separation-promoting monomer;
• and
• the adhesive containing 0.1 to 4 parts by weight of said at least one photoinitiator per 100 parts by weight of the sum of said at least one photopolymerizing monomer and said at least one separation-promoting monomer.

An ultraviolet-hardenable adhesive used for bonding a non-water swellable, ophthalmic-lens blank to a support member, in producing a non-water swellable ophthalmic lens, the adhesive consisting essentially of:

• at least one photopolymerizing monomer;
• at least one separation-promoting monomer for promoting separation of the bonded lens and support member from each other;
• at least one photoinitiator;
• and
• at least one member of the group consisting of photopolymerizing comonomer, stabilizer, and filler;
• said at least one photopolymerizing monomer being selected from the group consisting of acrylates or methacrylates represented by following general formulas (I) and (III):
• ##STR18## wherein R.sub.1 is hydrogen or methyl,
• R.sub.2 is hydrogen or methyl,
• R.sub.3 is hydrogen or methyl,
• m is a positive integer from 2 to 10, and
• n is a positive integer from 1 to 5;
• said at least one separation-promoting monomer being selected from the group consisting of ethylenically unsaturated compounds represented by a following general formula (III):
• ##STR19## wherein R.sub.4 is hydrogen or methyl,
• R.sub.5 is hydrogen or methyl, and
• l is a positive integer from 4 to 20;
• the adhesive containing 40 to 80 parts by weight of said at least one photopolymerizing monomer and 60 to 20 parts by weight of said at least one separation-promoting monomer, per 100 parts by weight of the sum of said at least one photopolymerizing monomer and said at least one separation-promoting monomer;
• and
• the adhesive containing 0.1 to 4 parts by weight of said at least one photoinitiator per 100 parts by weight of the sum of said at least one photopolymerizing monomer and said at least one separation-promoting monomer.