Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1988-07-25
1991-01-01
Ryan, Patrick
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428 76, 428913, 369284, 369288, 346766, 3461351, 430945, B32B 302
Patent
active
049817434
ABSTRACT:
This disclosure concerns protective overcoatings for an information storage record which includes an information-layer adapted for optical data recording. The protective overcoatings are transparent to recording radiation and especially adapted to enhance service life and recording characteristics.
A typical coating comprises the polymerization product of a formulation including at least one radiation-cured "bulk resin" (e.g, an acrylated epoxy or an acrylate monomer or pre-polymer), plus an associated non-yellowing photo-initiator, a non-yellowing adhesion-promoter and related coating-constituents.
Once applied, this coating is cured by exposure to UV radiation such as to cure it without heating it significantly so that said radiation functions as the sole or principal polymerizing agent, acting quickly, and with little or no supplemental heat, and without extended "tackiness". This formulation will readily "level" to render the desired coating to serve as a mechanical/chemical barrier.
REFERENCES:
patent: 4463083 (1984-07-01), Kitajima et al.
patent: 4492718 (1985-01-01), Mayer et al.
patent: 4522846 (1985-06-01), Mayer et al.
Bramson R. S.
McCormack John J.
Ryan Patrick
Starr Mark T.
Unisys Corporation
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