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Method of producing polyimide resin, method of producing polyimide coating, method of producing polyamic acid solution, polyimide coating, and polyamic acid solution
US9458355B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9458355-B2 |
| Application number | US-201313971003-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 20, 2013 |
| Priority date | Aug 21, 2012 |
| Publication date | Oct 4, 2016 |
| Grant date | Oct 4, 2016 |
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- Title
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Abstract
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A polyimide resin produced by heating a polyamic acid resulting from the reaction of a tetracarboxylic acid dianhydride component and a diamine component in N,N,N′,N′-tetramethylurea.
First claim
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What is claimed is: 1. A method of producing a polyimide coating, consisting essentially of heating a polyimide precursor coating formed by coating on a base substance, wherein the polyimide precursor coating consists of a polyamic acid solution in N,N,N′,N′-tetramethylurea, the polyamic acid solution consists of a solution resulting from the reaction of reactants consisting of a tetracarboxylic acid dianhydride component and a diamine component in N,N,N′,N′-tetramethylurea, wherein the tetracarboxylic acid dianhydride component consists of one or more compounds selected from the group consisting of pyromellitic acid dianhydride, 3,3′,4,4′-biphenyl tetracarboxylic acid dianhydride, 2,3,3′,4′-biphenyl tetracarboxylic acid dianhydride, 3,3′,4,4′-benzophenone tetracarboxylic acid dianhydride, and 3,3′,4,4′-diphenylsulfonetetracarboxylic acid dianhydride, and the polyimide precursor coating is heated at a temperature from 120° C. to 350° C. 2. The method of producing a polyimide coating according to claim 1 , wherein the amount of N,N,N′,N′-tetramethylurea is from 20 to 2000 parts by mass based on 100 parts by mass of total amount of the tetracarboxylic acid dianhydride component and the diamine component.
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Classifications
characterised by the solvent(s) used · CPC title
derived from polyamines and polycarboxylic acids · CPC title
Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title
characterised by the process itself, e.g. steps, continuous · CPC title
Macromolecular compounds having nitrogen in the main chain according to C08L75/00 - C08L79/00; Derivatives thereof · CPC title
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- What does patent US9458355B2 cover?
- A polyimide resin produced by heating a polyamic acid resulting from the reaction of a tetracarboxylic acid dianhydride component and a diamine component in N,N,N′,N′-tetramethylurea.
- Who is the assignee on this patent?
- Tokyo Ohka Kogyo Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification C09D179/08. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 04 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).