Process for preparing aromatic polyimides, polyimides prepared thereby
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IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08G-073/10
C08G-073/12
출원번호
US-0363800
(1973-05-25)
발명자
/ 주소
D\Alelio Gaetano Francis (South Bend IN)
출원인 / 주소
University of Notre Dame du Lac (Notre Dame IN 02)
인용정보
피인용 횟수 :
53인용 특허 :
0
초록▼
A process for preparing substantially completely cyclized aromatic polyimides, either monomeric, oligomeric or polymeric, is provided. The process involved the reaction of a mixture of at least one tetracarboxylic acid dianhydride and at least one aromatic diamine in at least one aromatic phenol, pr
A process for preparing substantially completely cyclized aromatic polyimides, either monomeric, oligomeric or polymeric, is provided. The process involved the reaction of a mixture of at least one tetracarboxylic acid dianhydride and at least one aromatic diamine in at least one aromatic phenol, preferably cresols, in the presence of an organic azeotroping agent such as a cyclic hydrocarbon, preferably benzene, until substantially all of the water of reaction is eliminated. Other monomers, e.g., a monoamine or an ab
대표청구항▼
A process for the preparation of a substantially cyclized polyimide of the formula: [Figure](A) wherein Ar is a divalent aromatic oganic radical, Ar′is a tetravalent aromatic organic radical, the four carbonyl groups being attached directly to separate carbon atoms and each pair of carbonyl groups
A process for the preparation of a substantially cyclized polyimide of the formula: [Figure](A) wherein Ar is a divalent aromatic oganic radical, Ar′is a tetravalent aromatic organic radical, the four carbonyl groups being attached directly to separate carbon atoms and each pair of carbonyl groups being attached to adjacent carbon atoms in the Ar′radical, A is NH2－, [Figure] [Figure] where R″is defined hereinafter, A′is －R″, －ArNH2, [Figure] [Figure] where R″is defined hereinafter, and n is 0 or a positive integer of at least one, soluble in a phenol which comprises: 1. reacting a reaction mixture of at least one tetracarboxylic acid dianhydride of the formula: [Figure](B) wherein Ar′ is as defined above, and at least one aromatic diamine of the formula: H2N－Ar－NH2 (C) wherein Ar is as defined above, at a molar ratio of dianhydride to diamine in the range of m to m +1:m to m +1 where m is a positive integer of at least one and as high as n in formula (A), with the proviso that when the ratio of dianhydride to diamine is m +1:m, the reaction mixture contains 0 or 2 moles of a monoamine of the formula R″NH2 wherein R″is a hydrocarbon radical of 1 to 12 carbon atoms which is saturated, has olefinic unsaturation or acetylenic unsaturation, and －CN, －CHO or －CH=NR″substituted derivatives thereof, [Figure] where each R′is hydrogen or －CH3 in the presence of at least one organic azeotroping agent which: a. gives a water azeotrope having a boiling point less than 95°C at atmospheric pressure, b. is non-reactive with the dianhydride and the diamine, and c. separates from water as a distinct phase, said reaction conducted at a temperature less than 140°C and below the boiling point of said phenol and higher than the boiling point of said azeotroping agent with the vapor phase temperature bEing between that of the water azeotrope and no higher than 95°C 2. removing water of reaction and the azeotroping agent from the reaction mixture as a water azeotrope and 3. returning quantities of azeotroping agent to the reaction mixture to maintain the temperature and reaction mixture volume substantially constant. A substantially cyclized polyimide soluble in phenols having the formula: [Figure] wherein Ar is a divalent aromatic organic radical, Ar′is a tetravalent aromatic organic radical, the four carbonyl groups being attached directly to separate carbon atoms and each pair of carbonyl groups being attached to adjacent carbon atoms in the Ar′radical, [Figure] [Figure] [Figure] [Figure] [Figure] R″is a hydrocarbon radical of 1 to 12 carbon atoms which is saturated, has olefinic unsaturation and －OH, －CN, －CHO or －CH=NR″substituted derivatives thereof, and n has a numerical value of 4 to 100.
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이 특허를 인용한 특허 (53)
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