Method for overcoating optical recording media

Details Method for overcoating optical recording media Method for overcoating optical recording media

B - Operations, Transporting

29

C

42/2, 204/91.4

B29C 71/04 (2006.01) G11B 7/24 (2006.01) G11B 7/26 (2006.01)

Patent

CA 1277282

ABSTRACT OF THE DISCLOSURE IMPROVED METHOD FOR OVERCOATING OPTICAL RECORDING MEDIA This disclosure concerns methods of applying protective overcoatings to 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 "bulk resin" (e.g., an acrylamide or an acrylate monomer or pre-polymer), plus an associated non-yellowing photo-initiator, and a non-yellowing adhesion-promoter. This coating has been obtained by curing the monomer or prepolymer formulation by exposure to W radiation so 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 enable the desired coating to serve as a mechanical/chemical barrier. "Leveling" is accelerated and enhanced by dispersing the coating as "beads" with a nozzle placed close enough to the substrate to "top" the beads in the fashion of a "Doctor Blade".

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