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:
Apr. 21, 2015
Filed:
Aug. 17, 2010
Susumu Takasaki, Ube, JP;
Hiroo Yamashita, Ube, JP;
Seiichirou Takabayashi, Ube, JP;
Tomoko Hayashida, Ube, JP;
Mitsuo Yamanaka, Ube, JP;
Takafumi Hirakawa, Ube, JP;
Susumu Takasaki, Ube, JP;
Hiroo Yamashita, Ube, JP;
Seiichirou Takabayashi, Ube, JP;
Tomoko Hayashida, Ube, JP;
Mitsuo Yamanaka, Ube, JP;
Takafumi Hirakawa, Ube, JP;
Ube Industries, Ltd., Ube-shi, Yamaguchi, JP;
Abstract
There may be provided a process for producing a polyimide siloxane solution composition having a further improved long-term viscosity stability; and a polyimide siloxane solution composition. In the process for producing the polyimide siloxane solution composition by polymerizing/imidizing a tetracarboxylic acid component and a diamine component consisting of (a) a diaminopolysiloxane, (b) a diamine having a polar group and (c) a diamine other than (a) and (b) in a solvent, the tetracarboxylic acid component and the diamine component excluding (b) the diamine having a polar group are polymerized/imidized to provide a reaction mixture solution, and then (b) the diamine having a polar group is added to the reaction mixture solution last, and the mixture is polymerized/imidized.