Title:
HIGH-PURITY OXYDIPHTHALIC ACID ANHYDRIDE AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2006/062137
Kind Code:
A1
Abstract:
A high-purity oxydiphthalic acid anhydride that in the production of a polyimide containing an oxydiphthalic acid anhydride, enables production of one of satisfactorily high strength; and an industrially simple and easy process for producing the same. There is provided a high-purity oxydiphthalic acid anhydride exhibiting a content of insoluble microparticulate matter, the insoluble microparticulate matter having a 5 to 20 μm diameter of circle equivalent to projected area, of ≤ 3000 particles per g, which high-purity oxydiphthalic acid anhydride in the form of an acetonitrile solution of 4 g/L concentration exhibits a 400 nm light transmittance, measured at a light path length of 1 cm, of ≥ 98.5%.
Inventors:
NAGAYAMA KAZUHIRO (JP)
YOKOYAMA TOSHIHARU (JP)
TAKAHARA JUN (JP)
NITTA MAKOTO (JP)
MIKAMI HIROSHI (JP)
YOKOYAMA TOSHIHARU (JP)
TAKAHARA JUN (JP)
NITTA MAKOTO (JP)
MIKAMI HIROSHI (JP)
Application Number:
PCT/JP2005/022487
Publication Date:
June 15, 2006
Filing Date:
December 07, 2005
Export Citation:
Assignee:
MITSUBISHI CHEM CORP (JP)
NAGAYAMA KAZUHIRO (JP)
YOKOYAMA TOSHIHARU (JP)
TAKAHARA JUN (JP)
NITTA MAKOTO (JP)
MIKAMI HIROSHI (JP)
NAGAYAMA KAZUHIRO (JP)
YOKOYAMA TOSHIHARU (JP)
TAKAHARA JUN (JP)
NITTA MAKOTO (JP)
MIKAMI HIROSHI (JP)
International Classes:
C07D307/89; C08G73/14; C07B63/00
Foreign References:
| JPH11222484A | 1999-08-17 | |||
| US4526984A | 1985-07-02 | |||
| JPS55122738A | 1980-09-20 | |||
| JPH08143480A | 1996-06-04 | |||
| JPS63215662A | 1988-09-08 |
Attorney, Agent or Firm:
Senmyo, Kenji (38 Kanda-Higashimatsushitach, Chiyoda-ku Tokyo 42, JP)
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