公开(公告)号：US3898233A

公开(公告)日：1975-08-05

申请号：US37024173

申请日：1973-06-15

Applicant: ALLIED CHEM

Inventor： BACHMANN WILLIAM E ,  FLATT THOMAS R

IPC: C09B5/22 ,  C09B5/20 ,  C09B67/48

CPC classification number: C09B67/0025 ,  C09B5/20

Abstract: A new crystalline polymorphic form of flavanthrone is disclosed. This new form exhibits only one prominent X-ray diffraction peak between 7.00 and 8.00 dA and only two prominent peaks between 3.30 and 3.75 dA. In contrast to the known form of flavanthrone, the new form exhibits desirable transparent mass tones when employed as a pigment.

Abstract translation: 公开了一种新型黄烷酮的多晶型物。 这种新形式在7.00和8.00dA之间仅显示出一个显着的X射线衍射峰，并且在3.30和3.75dA之间仅显示两个突出的峰。 与已知形式的黄烷酮相反，当用作颜料时，新形式显示出期望的透明质量色调。