摘要:
For record carrier material, the front and the back sides of which are provided with a lacquer layer and the front side of which is coated with an aluminum layer, one of the two lacquer layers is admixed with a material, such as metal azide, which forms a metal radical suitable for reacting with fatty acids, while at least one of the lacquer layers is admixed with a fatty acid or a mixture of fatty acids.
摘要:
To reduce scratches on the aluminum-covered front surface of a record carrier substrate having a back surface covered with a nitrocellulose lacquer, 0.1 to 2 percent by weight of a fatty acid, as referred to the weight of the wet lacquer, is added to the last applied layer of lacquer. When the record carrier is wound into a roll, the aluminum layer contacts and reacts with the fatty acid forming a sliding layer.
摘要:
A recording medium of the type having a first coat which is discolorable by the limited application of heat in a limited area includes a second coat of a material having heat-conducting and electrically insulating properties applied on the first coat and a third coat of a material which is electrically conductive applied on the second coat. The third coat is removable in a limited area by the action of an electric arc which is limited in time and area. A record is made on the recording medium by a technique which includes the steps of igniting an electric arc between the third coat and an electrode, maintaining the electric arc until an opening is formed in a portion of the third coat corresponding to the shape of the electrode, and heating the second coat through the opening to an extent that the amount of heat passing into the first coat from the second coat adjacent the opening causes permanent discoloration of the first coat.