Process for casting polymer rods

Details Process for casting polymer rods Process for casting polymer rods

1976-09-13

1978-11-28

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

264 1, 264334, 264337, 264338, B29C 102, B29C 104, B29D 1100

Patent

active

041276388

ABSTRACT:
Polymeric rods suitable for manufacturing contact lenses may be improved by casting the rod in Teflon or in a Teflon-coated tube. Contact lens materials containing NVP as a monomer are preferably cast in tubes made of Teflon or having Teflon coating on the interior surface. The rods thus cast are substantially free of strain, have a uniform diameter, a smooth, continous exterior surface and an absence of voids therein. When initial polymerization is conducted at a moderate temperature in a water bath, the mixture is polymerized homogeneously to provide superior uniformity.

REFERENCES:
patent: 3621079 (1971-11-01), Leeds
patent: 3700761 (1972-10-01), O'Driscoll
patent: 3839304 (1974-10-01), Hovey
patent: 3894129 (1975-07-01), Hoffman
patent: 3966847 (1976-06-01), Seiderman
patent: 3978164 (1976-08-01), LeBoeuf et al.

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