Optical lens system incorporating melanin as an absorbing pigmen

Details Optical lens system incorporating melanin as an absorbing pigmen Optical lens system incorporating melanin as an absorbing pigmen

1990-03-19

1991-07-30

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

350 11, 350 12, 350 17, 252582, 252583, 252587, 252588, 428412, 526314, 526259, 5262381, 527201, 527202, 527203, 528200, 528392, 8507, 8509, 8512, 8673, C08J 300

Patent

active

050361155

ABSTRACT:
Melanin is used as the absorbing pigment for radiation protective eyeware. Thus, a melanin-plastic copolymer was formed by adding a catalyst (benzoyl peroxide) to the liquid monomer, diethylene glycol bis allyl carbonate (CR-39), which contained dissolved catechol (a melanin precursor); the solution was heated for one day at 50 degrees celsius and an additional two days at 65 degrees celsius and yielded an optically transparent solid plastic with amber color and with an optical absorption spectrum very close to that associated with melanin.

REFERENCES:
patent: 3322719 (1967-05-01), Peilstocker
patent: 3764477 (1973-09-01), Lehmann et al.
patent: 4464525 (1984-08-01), Vance
patent: 28222339 (1958-02-01), Hagemeyer, Jr. et al.
"Hackh's Chemical Dictionary" Fourth Edition 1983, pp. 413 and 698.
"The Merck Index" Tenth Edition, pp. 266, 827 and 1154.
Organic Chemistry, 4th Ed.; Karrer (1950); pp. 428, 429, 576, 577 and 579.
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