Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Reexamination Certificate
2005-05-10
2005-05-10
Jackson, Monique R. (Department: 1773)
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
C428S209000, C428S458000, C427S096100, C427S098400, C430S270100, C430S311000, C430S319000, C430S325000, C430S406000, C528S176000, C528S179000, C528S183000, C528S188000, C528S210000
Reexamination Certificate
active
06890626
ABSTRACT:
A polyimide-based polycondensate which may be used as an insulation film by coating a copper foil with the polycondensate and by heating the coated copper foil, which insulation film does not warp the foil, as well as a production process thereof, is disclosed. The polycondensate according to the invention is a solvent-soluble polycondensate containing a benzoxazole component having a carboxylic group and an imide component having a phenolic hydroxyl group, which is obtained by dehydration-condensing one or more tetracarboxylic dianhydrides with one or more aromatic diamines having an amino group and a phenolic hydroxyl group, the amino group and the phenolic hydroxyl group being located at ortho positions with respect to each other, by heating the one or more tetracarboxylic dianhydrides and the one or more aromatic diamines at 150° C. to 220° C. in the presence of an acid catalyst.
REFERENCES:
patent: 4087409 (1978-05-01), Preston
patent: 5919892 (1999-07-01), Hwang et al.
patent: 0387062 (1990-09-01), None
patent: 5-67871 (1993-03-01), None
patent: 8-12763 (1996-01-01), None
patent: 8-176301 (1996-07-01), None
patent: 11236450 (1999-08-01), None
patent: 2000-147768 (2000-05-01), None
patent: 2001-11181 (2001-01-01), None
Itatani Hiroshi
Matsumoto Shunichi
Jackson Monique R.
PI R&D Co., Ltd.
LandOfFree
Imide-benzoxazole polycondensate and process for producing... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Imide-benzoxazole polycondensate and process for producing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imide-benzoxazole polycondensate and process for producing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3463704