Magnetooptical recording medium bonded with a flexible foam adhe

Details Magnetooptical recording medium bonded with a flexible foam adhe Magnetooptical recording medium bonded with a flexible foam adhe

1989-04-14

1990-12-11

Lesmes, George F.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Composite having voids in a component

428614, 428698, 428900, B32B 712

Patent

active

049770195

ABSTRACT:
An information recording element consists of one or two substrates, on each of which a magnetooptical recording layer enclosed on both sides by dielectric layers is applied. The composite consisting of substrate - dielectric layer-recording layer-dielectric layer is adhesively bonded to a further substrate or to a plastic layer by means of a flexible adhesive foam layer applied over the entire surface. In the case of adhesive bonding over the entire surface, air gaps are excluded. The thermal stability of the adhesive foam layer ranges from about -40.degree. C. to +150.degree. C. and the adhesive foam layer is resistant to solvents and plasticizers. The heat penetration coefficient of the adhesive foam layer is lower than the heat penetration coefficient of quick-curing adhesives and of polyurethane adhesives which cure by moisture absorption, and is less than about 450 W.s.sup.1/2 /K.m.sup.2.

REFERENCES:
patent: 4751124 (1988-06-01), Matsuzawa et al.
patent: 4782477 (1988-11-01), Ichihara et al.
patent: 4821050 (1989-04-01), Yabe et al.
patent: 4870429 (1989-09-01), Fujita et al.
Suh et al., "Latent Heat Effects of Pulsed Laser Beam Induced Temperature Profiles in Optical Recording Thin Films", Optical Society of America, Applied Optics, vol. 23, No. 22, Nov. 15, 1984, pp. 3965-3971.

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