Glass polishing processes

Details Glass polishing processes Glass polishing processes

1980-11-25

1983-06-28

Derrington, James H.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51281R, 51284R, 51309, B24B 100

Patent

active

043898190

ABSTRACT:
A polishing process for mineral and organic ophthalmic lenses involves essentially a first step of mixing cerium oxide powder or zirconium oxide powder with (a) an alkali metal or ammonium salt of the condensation product of naphthalene sulphonic acid with formaldehyde, or of lignin sulphonic acid serving as an anionic deflocculating agent in an amount necessary to cause deflocculation, (b) an electrolyte containing a metal cation having a valency greater than 1, and (c) water, to form a slurry in which the powder is in a state of reversible flocculation. By this method the performance of the polishing powder in terms of numbers of acceptable lenses processed by each kilo of the powder is greatly improved.

REFERENCES:
patent: 3388982 (1968-06-01), Foster
patent: 3458300 (1969-07-01), Duvall
patent: 3685218 (1972-08-01), Gambale et al.
patent: 3754878 (1973-08-01), Burke
patent: 4161394 (1979-07-01), Regan
The Condensed Chemical Dictionary, Reinhold Pub. Corp., 1961, New York, p. 666.

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