Method of manufacturing video disc

Details Method of manufacturing video disc Method of manufacturing video disc

1982-04-16

1984-09-18

Derrington, James H.

Plastic and nonmetallic article shaping or treating: processes

Forming sound grooves in records

264105, 264107, B29D 1700

Patent

active

044723369

ABSTRACT:
A method of manufacturing capacitance video discs comprising thermoplastic resins and conductive carbon black, wherein said conductive carbon black having an average primary particle size of 25 millimicrons or less is washed by water or an inorganic acid, heated at temperatures of 400.degree. to 1,200.degree. C. in a non-oxidizing atmosphere and wherein the coarse particles having a grain size of 0.05 mm or more are substantially eliminated. This method can provide video discs having reduced surface defects and stability after a moisture-proof test.

REFERENCES:
patent: 3842194 (1974-10-01), Clemens
patent: 4151132 (1979-04-01), Khanna
patent: 4228050 (1980-10-01), Martin et al.
patent: 4275100 (1981-06-01), Datta
patent: 4280941 (1981-07-01), Datta et al.
patent: 4351747 (1982-09-01), Miyamoto et al.

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