Method of cast molding contact lenses

Plastic and nonmetallic article shaping or treating: processes – Optical article shaping or treating – Including step of mold making

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Details

425808, B29D 1100

Patent

active

058433465

ABSTRACT:
An improved method for cast molding RGP contact lenses employs mold sections injection molded from a specific class of thermoplastic, polyolefin resins.

REFERENCES:
patent: 3808178 (1974-04-01), Gaylord
patent: 4152508 (1979-05-01), Ellis
patent: 4284591 (1981-08-01), Neefe
patent: 4686267 (1987-08-01), Ellis
patent: 4780515 (1988-10-01), Deichert
patent: 5271875 (1993-12-01), Appleton
"Flow Rates of Thermoplastics by Extrusion-Plastometer," American Society for Testing and Materials, Designation D 1238-86, pp. 552-565.

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