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:
Mar. 10, 2020
Filed:
Apr. 06, 2016
Unitika Ltd., Amagasaki-shi, Hyogo, JP;
Yumeto Fukubayashi, Uji, JP;
Makoto Nakai, Uji, JP;
Akira Shigeta, Uji, JP;
Munenori Yamada, Uji, JP;
UNITIKA LTD., Hyogo, JP;
Abstract
The present invention is to provide a polyamide-imide which has a high regularity of molecular structure and few branched structures, does not contain hydrogen halide, is not required to be separated and purified in post processes, and can be suitably used as a film, a varnish, or a molding material; raw material salt of polyamide-imide and production method thereof. The polyamide-imide has a repeating unit represented by the general formula (1): in which R, Rrepresent independently a divalent residue having an aromatic ring, an aliphatic ring or an aliphatic hydrocarbon; R, Rrepresent independently a trivalent residue having an aromatic ring or an aliphatic ring; and an hydrogen atom bonding to the respective rings may be replaced by another atom or an atomic group.