| 摘要 |
Conformable, multi-layered tape for bonding fusible metal alloy to ophthalmic lens blanks. The tape comprises a polymeric backing layer, a pressure-sensitive adhesive on one surface of the backing layer, and a non-tacky adhesion-promoting layer on the other surface of said backing layer. The tapes have a 2% secant modulus in the range of about 35 kg/cm<s2>s to 20,000 kg/cm<s2>s, a shear value of at least about 10 minutes, a 180o peel value in the range of about 60g/cm width to 1400g/cm width, a percent elongation at break in the range of about 45% to 1000% and a lap shear value of at least about 5 kg/cm<s2>s. Preferably the tapes also have a tensile strength at 100% elongation in the range of about 0.2 to 4 kg/cm. |
