Method for the improvement of gramophone records
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsKiyoshi Imada, Susumu Ueno, Tokuji Abe
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Abstract
Gramophone records made of a vinyl chloride based resin are subjected to a treatment with low temperature plasma of a gas having no polymerizability in the plasma condition. A markedly improved anti-static effect is imparted to the surface of the gramophone record which also becomes highly resistant to wearing so that the signal/noise ratio in playing of the gramophone record is remarkably improved even after many times of repeated playing of the record.
Claims3
A method for the improvement of the surface properties of a gramophone record made of vinyl chloride based resin which comprises exposing the gramophone record to a low temperature plasma atmosphere of a gas having no polymerizability in the plasma condition under a pressure in the range from 0.001 Torr to 10 Torr, wherein said gas having no polymerizability in the plasma condition is selected from the group consisting of helium, neon, argon, nitrogen, nitrous oxide, nitrogen dioxide, oxygen, air, chlorine, hydrogen chloride, carbon monoxide, carbon dioxide and hydrogen.
Dependencies are inferred from the claim text.