Casting plastic lenses from thermohardening monomer with compens

Details Casting plastic lenses from thermohardening monomer with compens Casting plastic lenses from thermohardening monomer with compens

1981-03-05

1985-02-05

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Utilizing plasma, electric, electromagnetic, particulate, or...

264 22, 264 23, 425808, B29D 1100

Patent

active

044977549

ABSTRACT:
Plastic lenses are cast from thermohardening resins using two mating mold halves positioned in a tubular sleeve which is provided with a fluid compensating reservoir that retains excess resin. As the mold is heated to polymerize the resin the monomer first expands in volume and flows into the reservoir, then as the polymerizing resin contracts additional resin flows out of the reservoir into the mold until the gel stage is reached. Polymerization is completed by moving the mold halves towards each other.

REFERENCES:
patent: 2342378 (1944-02-01), Smith
patent: 2542386 (1951-02-01), Beattie
patent: 3240854 (1966-03-01), Ewer
patent: 3738775 (1976-02-01), Sarofien
patent: 4113224 (1978-09-01), Clark et al.

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