Comformable, multilayered tape adherent on one surface to fusabl

Details Comformable, multilayered tape adherent on one surface to fusabl Comformable, multilayered tape adherent on one surface to fusabl

1980-05-01

1981-09-01

Cannon, James C.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

51277, 428352, 428354, 428355, 428356, B32B 3100, B32B 3300, C09J 702

Patent

active

042870135

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 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.sup.2 to 20,000 kg/cm.sup.2, a shear 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 1000% and a lap shear value of at least about 5 kg/cm.sup.2. Preferably the tapes also have a tensile strength at 100% elongation in the range of about 0.2 to 4 kg/cm.

REFERENCES:
patent: 2292024 (1942-08-01), Dreher
patent: 2913355 (1959-11-01), Collins
patent: 2982061 (1961-05-01), Dillon
patent: 3160549 (1964-12-01), Caldwell et al.
patent: 3277612 (1966-10-01), Brandt
patent: 3355342 (1967-11-01), Lanman
patent: 3665918 (1972-05-01), Lindquist et al.
patent: 4199645 (1980-04-01), Schwarz et al.

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