Process for the manufacture of spectacle lenses made of diglycol

Details Process for the manufacture of spectacle lenses made of diglycol Process for the manufacture of spectacle lenses made of diglycol

1979-08-15

1981-04-07

Arnold, Donald J.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Changing mold size or shape during molding or with shrinkage...

264 24, 526314, 5262325, B29D 1100

Patent

active

042605644

ABSTRACT:
An improved method for manufacturing spectacle lenses and the like from diglycol allyl carbonate or equivalent plastic by first heating the plastic monomer in the liquid state and containing a polymerization initiator therefor in a planar mold until a degree of polymerization in the range of about 65-85% of completion has been achieved, then removing the partially polymerized material from the mold, subjecting the same to deflection to a curvature corresponding to the desired lens and heating the thus-deflected material until polymerization is complete. Preferably, the initial planar molding step is carried out with a layer or sheet of the material of sufficient size as to contain a plurality of individual lens elements, and after removal thereof from the mold, a plurality of individual lens elements is derived therefrom and such elements are separately subjected to deflection and further polymerization. Preferably, the amount of polymerization initiator exceeds the normally used amount. A post thermal treatment is advantageous to stabilize the lens elements from loss of the curvature imparted thereto.

REFERENCES:
patent: 3211811 (1965-10-01), Laumau
patent: 3700761 (1972-10-01), O'Driscoll et al.
patent: 4095772 (1978-06-01), Weber

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