IPC분류정보
국가/구분 |
United States(US) Patent
공개
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0245226
(2002-09-16)
|
공개번호 |
US-0065044
(2003-04-03)
|
우선권정보 |
JP-0280018 (2001-09-14) |
발명자
/ 주소 |
- Ozawa, Hideki
- Yamamoto, Shigeru
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
0 |
초록
▼
A flexible polyimide foam having an apparent density of 13.5 to 900 kg/m3and a glass transition temperature of 300° C. or higher can be prepared by mixing an aromatic tetracarboxylic acid comprising 2,3,3′,4′-biphenyltetracarboxylic dianhydride a portion of which is converted into its mono- or di-lo
A flexible polyimide foam having an apparent density of 13.5 to 900 kg/m3and a glass transition temperature of 300° C. or higher can be prepared by mixing an aromatic tetracarboxylic acid comprising 2,3,3′,4′-biphenyltetracarboxylic dianhydride a portion of which is converted into its mono- or di-lower primary alcohol ester with an aromatic polyamine containing diaminodisiloxane in an amount of 0.1 to 10 mol. %, based on the amount of total amine compounds, to give a solid of polyimide precursor; heating the solid of polyimide precursor to a temperature of 300° C. to 500° C. to produce a polyimide foam; and compressing the polyimide foam.
대표청구항
▼
1. A flexible polyimide foam having an apparent density of 13.5 to 900 kg/m3and a glass transition temperature of 300° C. or higher which is obtained by compressing a polyimide foam having an apparent density of 67.5 kg/m3or less and the same glass transition temperature. 2. The flexible polyimide f
1. A flexible polyimide foam having an apparent density of 13.5 to 900 kg/m3and a glass transition temperature of 300° C. or higher which is obtained by compressing a polyimide foam having an apparent density of 67.5 kg/m3or less and the same glass transition temperature. 2. The flexible polyimide foam of claim 1, wherein the polyimide comprises 2,3,3′,4′-biphenyltetracarboxylic acid units, aromatic diamine units, and diaminosiloxane units. 3. The flexible polyimide foam of claim 1, wherein the polyimide comprises 2,3,3′,4′-biphenyltetracarboxylic acid units, aromatic diamine units, aromatic tetraamine units, and diaminosiloxane units. 4. The flexible polyimide foam of claim 1, which is in the form of sheet having a thickness of 1 to 50 mm. 5. A process for producing a flexible polyimide foam having an apparent density of 13.5 to 900 kg/m3and a glass transition temperature of 300° C. or higher, which comprises the steps of:mixing an aromatic tetracarboxylic acid comprising 2,3,3′,4′-biphenyltetracarboxylic dianhydride a portion of which is converted into a mono- or di-lower primary alcohol ester thereof with an aromatic polyamine containing diaminodisiloxane in an amount of 0.1 to 10 mol. %, based on the amount of total amine compounds, to give a solid of polyimide precursor; heating the solid of polyimide precursor to a temperature of 300° C. to 500° C. to produce a polyimide foam; and compressing the polyimide foam by means of a uniaxial compression press. 6. The process of claim 5, wherein the step of compression is performed at a temperature of 300 to 450° C. 7. The process of claim 5, wherein the polyimide foam before the compression has an apparent density of 6.75 to 67.5 kg/m3. 8. The process of claim 5, wherein the aromatic polyamine comprises 70 to 99.9 mol. % of an aromatic diamine having one or two benzene rings, 0 to 29.9 mol. % of an aromatic triamine or tetramine, and 0.1 to 10 mol. % of diaminosiloxane. 9. The process of claim 5, wherein 25 to 50 mol. % of the aromatic tetracarboxylic acid is converted into a mono- or di-lower primary alcohol ester thereof. 10. The process of claim 5, wherein the step of heating is performed for foaming the solid of polyimide precursor and converting the foamed product into a polyimide foam. 11. The process of claim 10, wherein the solid polyimide is foamed by microwave heating. 12. The process of claim 10, wherein the foamed product is heated at a glass transition temperature or higher for conversion into the polyimide foam. 13. A process for producing a jointed flexible polyimide foam article having an apparent density of 13.5 to 900 kg/m3and a glass transition temperature of 300° C. or higher, which comprises the steps of:mixing an aromatic tetracarboxylic acid comprising 2,3,3′,4′-biphenyltetracarboxylic dianhydride a portion of which is converted into a mono- or di-lower primary alcohol ester thereof with an aromatic polyamine containing diaminodisiloxane in an amount of 0.1 to 10 mol. %, based on the amount of total amine compounds, to give a solid of polyimide precursor; heating the solid of polyimide precursor to a temperature of 300° C. to 500° C. to produce plural polyimide foams in which one polyimide foam has a protrusion having an enlarged top portion and other polyimide foam has an indentation having an enlarged bottom portion; joining the protrusion of polyimide foam and the indentation of polyimide foam together to give a jointed structure; and compressing the jointed structure. 16. A process for producing a jointed flexible polyimide foam article having an apparent density of 13.5 to 900 kg/m3and a glass transition temperature of 300° C. or higher, which comprises the steps of:mixing an aromatic tetracarboxylic acid comprising 2,3,3′,4′-biphenyltetracarboxylic dianhydride a portion of which is converted into a mono- or di-lower primary alcohol ester thereof with an aromatic polyamine containing diaminodisiloxane in an amount of 0.1 to 10 mol. %, based on the amount of total amine compounds, to give a solid of polyimide precursor; heating the solid of polyimide precursor to a temperature of 300° C. to 500° C. to produce plural polyimide foams in which one polyimide foam has a protrusion having an enlarged top portion and other polyimide foam has an indentation having an enlarged bottom portion; compressing each of the plural polyimide foams; and joining the protrusion of compressed polyimide foam and the indentation of compressed polyimide foam together to give a jointed structure.
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