The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 25, 1999
Filed:
Dec. 09, 1997
Elzbieta Wardzinska, Grodzisk Mazowiecki, PL;
Piotr Penczek, Warsaw, PL;
Jadwiga Stanecka, Piastow, PL;
Barbara L/os-Kuchta, Wrocl/aw, PL;
Edward Pl/atek, Wrocl/aw, PL;
Krystyna Wiaduch, Wrocl/aw, PL;
Wojciech Jewl/oszewicz, Malczyce, PL;
Tomasz Jarmulski, Warsaw, PL;
Abstract
A method for making polyesterimide varnishes by polycondensing and imidat a mixture of trimellitic anhydride, 4,4'-diamino-diphenyl methane, glycol, dimethyl terephthalate and glycerol or tris(hydroxyethyl) isocyanurate or optionally p,p'-dihydroxy-diphenyl-dimethyl methane, with a transesterification catalyst added, and subsequently dissolving the resulting polyesterimide resin in an organic solvent with a crosslinking catalyst added, characterized by the feature that 2-methyl-1,3-propanediol and/or 2-butyl-2-ethyl-1,3-propanediol is used as the glycol or as one of the glycols.