Plastic lenses for spectacles
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 15, 2006
Grant Date -
Nov 4, 2004
app pub date -
May 27, 2004
filing date -
Mar 15, 2000
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Plastic lenses for spectacles having a high refractive index and a high Abbe's number, and having good transparency, heat resistance, mechanical strength and impact resistance are produced. Plastic lenses for spectacles are produced through polymerization of an epithio group-having compound (a), a polythiol compound (b) and a polyisocyanate compound (c) whereby the ratio (by mol) of the polythiol compound (b) to the polyisocyanate compound (c) is at least 1.2 calculated on the basis of --SH and --NCO groups. The invention also provides a process for preparing such lenses and a catalyst for use in said process.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully