Comformable, multilayered tape adherent on one surface to fusable metal alloys and on the other surface to ophthalmic lens blanks

A conformable, multilayered tape for bonding fusible metal alloy to an opthalmic lens blank which comprises

• a polymer backing layer,
• a pressure sensitive adhesive on one major surface of said backing layer, and
• a tack-free adhesion-promoting layer on the other major surface of said backing,
• wherein, when said tape is interposed between an ophthalmic lens blank and a fusible metal alloy so that said adhesive contacts said lens blank and said adhesion-promoting layer contacts said fusible metal alloy, the bond strength between said alloy and said lens blank is greater than the bond strength between said alloy and said lens blank if said tape were not present;
• and
• wherein said tape has a 2% secant modulus in the range of about 35 kg/cm.sup.2 to 20,000 kg/cm.sup.2, a sheer value of at least about 10 minutes, a 180.degree. peel value in the range of about 60 g/cm width to 1400 g/cm width, a percent elongation at break in the range of about 45% to 1,000% and a lap shear value of at least about 5 kg/cm.sup.2.