Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1980-12-02
1981-12-22
Pavelko, Thomas P.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264106, 264233, 425810, B29D 1700
Patent
active
043070450
ABSTRACT:
The invention provides a novel means for the improvement of the surface properties of a gramophone record made of a vinyl chloride-based resin which is deficient in respect of the susceptibility to electrostatic charging and anti-wearing resistance with consequent noise generation in the playing of the record. The inventive method comprises irradiating the surface of the gramophone record with ultraviolet light having a substantial energy distribution in the wavelength region of 200 nm or shorter in an atmosphere of oxygen or an oxygen-containing gaseous mixture of which the pressure or partial pressure of oxygen is at least 15 Torr. The effect of the ultraviolet irradiation is further enhanced and the durability of the antistatic effect is increased by bringing the ultraviolet-irradiated surface of the gramophone record into contact with a solution containing a surface active agent followed by washing with water and drying.
REFERENCES:
patent: 4157931 (1979-06-01), Bricot
Imada Kiyoshi
Nishina Yasuhide
Norma Hirokazu
Ueno Susumu
Pavelko Thomas P.
Shin-Etsu Chemical Co.
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