Title:
PROCESS FOR PRODUCING MELANIN, MELANIN PRODUCED BY THE PROCESS, FUNCTIONAL FILM CONTAINING THE MELANIN, AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2007/010861
Kind Code:
A1
Abstract:
[PROBLEMS] To provide: a melanin which has the excellent property of dyeing a
functional film and is excellent in reproducibility and storage stability;
a process for producing the melanin; a functional film which contains the melanin,
is reduced in melanin fluctuation, and has the excellent ability to protect the
eyes from ultraviolet; and a process for producing the film. [MEANS FOR SOLVING
PROBLEMS] The process for melanin production comprises: an oxidation reaction
step in which a melanin precursor is continuously oxidized with an oxidizing
agent in an aqueous alkali solution while the molar ratio of the melanin precursor
to the oxidizing agent is kept constant; and a precipitation step in which the
liquid reaction mixture after the oxidation step is acidified to precipitate
a melanin. The process for producing the melanin-containing functional film
comprises: a step in which a film is treated with an aqueous alkali solution containing
at least the melanin; and a step in which the film treated with the aqueous alkali
solution is treated with an aqueous solution containing an inorganic salt.
Inventors:
KAWAI RYOZO (JP)
TAKAKUWA KYOHEI (JP)
NAMIKI MASAHIKO (JP)
AOKI YOSHIYUKI
TAKAKUWA KYOHEI (JP)
NAMIKI MASAHIKO (JP)
AOKI YOSHIYUKI
Application Number:
PCT/JP2006/314077
Publication Date:
January 25, 2007
Filing Date:
July 14, 2006
Export Citation:
Assignee:
MGC FILSHEET CO LTD (JP)
AOKI EIKO (JP)
KAWAI RYOZO (JP)
TAKAKUWA KYOHEI (JP)
NAMIKI MASAHIKO (JP)
AOKI EIKO (JP)
KAWAI RYOZO (JP)
TAKAKUWA KYOHEI (JP)
NAMIKI MASAHIKO (JP)
International Classes:
C09B69/10; C08J5/18; C08J7/02; G02B5/30
Domestic Patent References:
| WO2005037754A1 | 2005-04-28 |
Foreign References:
| JPH08500371A | 1996-01-16 | |||
| JP2002533516A | 2002-10-08 | |||
| JPH08500371A | 1996-01-16 | |||
| JP2002533516A | 2002-10-08 | |||
| JP2663440B2 | 1997-10-15 | |||
| US4698374A | 1987-10-06 |
Other References:
See also references of EP 1911812A4
S. MOBELLI ET AL., THE 12TH INTERNATIONAL CONFERENCE ON PIGMENT CELLS, 1989, pages 69 - 77
S. MOBELLI ET AL., THE 12TH INTERNATIONAL CONFERENCE ON PIGMENT CELLS, 1989, pages 69 - 77
Attorney, Agent or Firm:
YAMASAKI, Yukuzo et al. (Sogo Nagatacho Bldg. 8F 11-28, Nagatacho 1-chom, Chiyoda-ku Tokyo 14, JP)
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