Process for the production of a photochromic object

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United States of America Patent

PATENT NO 6171525
SERIAL NO

09005754

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
SECOND OPTICAL HOLDING GMBHISARTALSTR 43 D-80469 MUNCHEN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Effer, Erhard Pocking, DE 3 137
Melzig, Manfred Wessling, DE 42 566
Schuster, Herbert Emmering, DE 11 139
Zinner, Herbert Taufkirchen, DE 17 204

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