Casting plastic lenses from thermohardening monomer with compensation for polymer expansion and shrinkage
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United States of America Patent
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-
Feb 5, 1985
Issued Date -
N/A
app pub date -
Mar 5, 1981
filing date -
Jul 30, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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