US 6,149,750 A · Lens blank surface protection film

Abstract

A conformable tape for bonding a lens block to ophthalmic lens blanks is provided. The tape comprises a polymeric backing and a pressure-sensitive adhesive. In a first preferred embodiment the surface of the backing is a blend of an olefin polymer with a polymer having acidic functionality. The blend may be formed as the backing layer, i.e., directly on the adhesive layer of the tape, or as the outer surface layer of a multilayered backing. In a second embodiment, the surface of the backing is a copolymer of an olefin monomer with a monomer having pendant acidic functionality. A lens block may be adhered to an ophthalmic lens blank by applying a section of the tape described above to an ophthalmic lens so that the pressure sensitive adhesive of the tape contacts the lens; conforming the tape to the compound surface of the lens; and attaching a lens block to at least a portion of the polymer backing layer. The tape may be made by extruding a polymeric backing material as described above; extruding a pressure-sensitive adhesive; and contacting the polymeric backing material and the pressure-sensitive adhesive. If desired, the polymeric backing material and the pressure sensitive adhesive may be coextruded to form the tape. In most preferred embodiments, the tape may be wound into a roll without a separate liner material.

Claims24

Dependent claims

A method of adhering a lens block to a compound surface of an ophthalmic lens blank, comprising the steps of:

applying the pressure-sensitive adhesive portion of a section of a conformable tape to the entirety of a compound surface of an ophthalmic lens blank, wherein the tape comprises a polymer backing having a first and a second major surfaces;
and a pressure-sensitive adhesive on the second major surface of the polymer backing, wherein the tape is wound into a roll without a liner and exhibits a maximum unwind force of less than 165 g/cm width;
conforming the tape to the surface so that the tape is essentially free from wrinkles, air bubbles and other discontinuities in the bond between the tape and the lens blank;
and
applying a lens block to at least a portion of the polymer backing layer of the tape.

2 more elements

A method of adhering a lens block to a compound surface of an ophthalmic lens blank, comprising the steps of:

applying the pressure-sensitive adhesive portion of a section of a conformable tape to the entirety of a compound surface of an ophthalmic lens blank, wherein the tape comprises a multilayered backing comprising an outer surface layer of a polymer composition having an olefin moiety and an acid moiety, and a core layer of a polymer selected from the group consisting of olefin polymers, ethylene vinyl acetate copolymers, ethylene methylacrylate copolymers, ethylene ethylacrylate copolymers, ethylene acrylic acid copolymers, vinyl polymers, urethane polymers, polyester films, ionomer polymers, maleic anhydride/acrylic acid graft copolymers with ethylene vinyl acetate copolymer, maleic anhydride/acrylic acid graft copolymers with ethyl acrylate, maleic anhydride/acrylic acid graft copolymers with polyethylene, maleic anhydride/acrylic acid graft copolymers with polypropylene;
and polyamide films;
and a pressure-sensitive adhesive, wherein the outer surface layer forms a first major surface of the tape and the adhesive layer forms a second major surface of the tape;
conforming the tape to the surface so that the tape is essentially free from wrinkles, air bubbles and other discontinuities in the bond between the tape and the lens blank;
and
applying a lens block to at least a portion of the polymer backing layer of the tape.

3 more elements

Dependencies are inferred from the claim text.

Lens blank surface protection film

Life of this patent

Lens blank surface protection film

Life of this patent

Abstract

Claims24