PROCESS FOR PRODUCING MELANIN, MELANIN PRODUCED BY THE PROCESS, FUNCTIONAL FILM CONTAINING THE MELANIN, AND PROCESS FOR PRODUCING THE SAME
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United States of America Patent
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Issued Date -
Dec 24, 2009
app pub date -
Jul 14, 2006
filing date -
Jul 15, 2005
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Abandoned
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Abstract
The present invention provides a melanin that is excellent in coloring a functional film, and in reproducibility and stability during storage, and a method for its production. Also, the invention provides a functional film containing a melanin and its method for production. Specifically, it provides a functional film containing a melanin of which the alteration is improved and which is excellent in the property for protecting eyes from ultraviolet rays, and in its method for production.The method for producing a melanin of the present invention, comprises, at least, under controlled conditions, a step for an oxidative reaction wherein a melanin precursor is continuously oxidized while the mole ratio of the melanin precursor relative to the oxidative agent is maintained at a constant ratio, and a step for precipitation wherein a melanin is precipitated by acidifying a reaction solution after the step for an oxidative reaction.
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