Conformable, multilayered tape

Details Conformable, multilayered tape Conformable, multilayered tape

C - Chemistry, Metallurgy

09

J

26/107, 117/27

C09J 7/02 (2006.01) B29D 11/00 (2006.01) G02B 3/00 (2006.01)

Patent

CA 1138270

ABSTRACT A conformable, multi-layered tape for bonding fusible metal alloy to ophthalmic lens blanks is provided. The tape comprises a polymeric backing layer, a pressure-sensitive adhesive on one surface of the backing layer, and a non-tacky primer layer on the other surface of said backing layer. The tapes have a 2% secant modulus in the range of about 35 kg/cm2 to 20,000 kg/cm , a shear value of at least about 10 minutes, a 180° 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 1000% and a shear lever load value of at least about 3.5 kg/cm2, Preferably the tapes also have a tensile strength at 100% elongation in the range of about 0.2 to 4 kg/cm.

350932

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