Process for the production of a photochromic object
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jan 9, 2001
Grant Date -
N/A
app pub date -
Jan 12, 1998
filing date -
Jul 27, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Disclosed is a process for the production of a photochromic object, composed of a polymer and containing at least one spirooxazin compound, having the following process steps: an acrylate monomer or a methacrylate monomer, respectively a mixture of a multiple thereof is utilized as the polymerizable monomer, the photochromic dyes as well as a polymerization initiator are mixed in the polymerizable monomer, the mixture yielded thereby is placed in a casting mold, polymerized and hardened. The present invention is distinguished by, in order to obtain a neutral gray, neutral brown or green photochromic tint of the polymerizable mixture, several photochromic dyes being added of which at least one is not a spirooxazin, and by the concentration of the spirooxazin compound(s) amounting to no more than 0.045 weight percent relative to the mass of the utilized monomer, and that of the polymerization initiator(s) amounting to more than 1 weight percent relative to the mass of the utilized monomer.
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