High-refractivity plastic lens resin formed from a polyisocyanate and a polythiol
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United States of America Patent
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-
Dec 13, 1988
Grant Date -
N/A
app pub date -
Nov 5, 1987
filing date -
Nov 21, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed herein is a colorless transparent plastic lens having high refractivity and low dispersion. The lens is light, has heat resistance sufficient for post processing, and is excellent in grinding machinability and impact resistance. It is made of a sulfur-containing urethane resin, which is a polymer of a specific polythiol and a particular polyisocyanate of at least bifunctionality.
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