Optical disc

Details Optical disc Optical disc

1994-10-11

1996-07-30

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 651, 428 652, 428694ML, 428694MM, 428694PR, 428900, 4302721, 522 14, 522170, 369284, B32B 302, G11B 566

Patent

active

055409679

ABSTRACT:
An optical disc comprises two facing disc units, at least one of which has a recording layer formed on its surface facing to the other disc unit. The disc units are bonded together by a layer of adhesive which may be a room-temperature curing thermosetting adhesive having a glass transition temperature higher than the upper limit of the range of temperatures of environments in which the disc may be used. Alternatively, the adhesive may be a room-temperature curing two-pack epoxy adhesive which comprises a bisphenol epoxy resin base agent and a modified aliphatic polyamine curing agent, and which has a viscosity of 100-1000 cps, a pot life of one hour or more, a cure shrinkage of 1.0% or less, a water absorption, after curing, of 0.2% or less, and a Shore hardness, after curing, of 80-90.

REFERENCES:
patent: 4113684 (1978-09-01), Petrie
patent: 4222070 (1980-09-01), Howe et al.
patent: 4711798 (1987-12-01), Veda et al.
patent: 4740947 (1988-04-01), Ohta et al.
patent: 4865949 (1989-09-01), Yamamuro et al.
May, Epoxy Resins: Chemistry and Technology, 2nd ed. pp. 683-687; 1988.
Skeist, Epoxy Resins, 1958.
Skeist, Handbook of Adhesives, 3rd ed., 1990.

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