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公开(公告)号：US5234966A
公开(公告)日：1993-08-10
申请号：US960239
申请日：1992-10-13
CPC分类号： C08J9/142 , C08G73/1032 , C08J9/125 , C08J2379/08
摘要： Polyimide foam of desired density is produced by adding to a polyimide precursor comprising carboxylic and diamine components at least one foam-enhancing polar, protic additive of the formula ROH, where R is hydrogen, or C.sub.1 to C.sub.12 linear or branched alkyl or cycloalkyl, unsubstituted or substituted with halo, aryl, alkoxy or hydroxy, and heating the resultant slurry to a temperature that does not exceed about 105.degree. C. to form a homogeneous melt. When heated to a higher temperature the melt foams and cures. The density of the foam is affected by the amount of foam-enhancing additive which is utilized.
摘要翻译： 通过向包含羧酸和二胺组分的聚酰亚胺前体中加入至少一种式ROH的促进泡沫的极性的质子性添加剂，其中R为氢或C1至C12的直链或支链烷基或环烷基，未取代的 或被卤素，芳基，烷氧基或羟基取代，并将所得浆液加热至不超过约105℃的温度以形成均匀的熔体。 当加热到更高的温度时，熔体发泡并固化。 泡沫的密度受所使用的增泡添加剂的量的影响。
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公开(公告)号：US5064867A
公开(公告)日：1991-11-12
申请号：US466096
申请日：1990-04-05
申请人： James R. Barringer , H. Eugene Broemmelsiek , Porter W. Gregory , Carroll W. Lanier , Raymond Lee , Harold E. Schulz
发明人： James R. Barringer , H. Eugene Broemmelsiek , Porter W. Gregory , Carroll W. Lanier , Raymond Lee , Harold E. Schulz
CPC分类号： C08J9/00 , B29C35/08 , B29C2035/0855 , B29K2105/04 , C08J2379/08
摘要： Described are ways of improving the yields of specification grade polyimide foam on a consistent basis from one run to the next, by use of improved microwave-based foaming processes. In one such process, prior to the application of the microwave radiation, the body of polyimide precursor is compressed at a pressure that will reduce the bulk volume of the precursor and heated to a temperature below that at which any substantial foaming occurs. to accomplish the foaming, one further embodiment of the invention employs microwave radiation directed upon the top, sides and ends of the body of above-treated polyimide precursor and of the foam structure as it is developing maintaining the developing foam under a substantially vapor-impermeable microwave compatible shroud. The extent to which the microwave radiation impinges upwardly into the bottom of said body and said foam structure is curtailed, preferably by means of a metallic shield located below the precursor and developing foam structure.
摘要翻译： 通过使用改进的基于微波的发泡方法，描述了通过一次运行到下一个步骤来提高规格级聚酰亚胺泡沫的产率的方法。 在一个这样的方法中，在施加微波辐射之前，聚酰亚胺前体的体积被压缩，其压力将降低前体的体积，并加热至低于发生任何实际发泡的温度。 为了实现发泡，本发明的另一个实施方案使用微波辐射，其指向上述处理的聚酰亚胺前体和泡沫结构体的顶部，侧面和端部，因为其在显影下保持显影泡沫基本上不透气 微波兼容护罩。 微波辐射向上撞击到所述主体和所述泡沫结构的底部的程度优选地通过位于前体和显影泡沫结构下方的金属屏蔽被限制。
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公开(公告)号：US5096932A
公开(公告)日：1992-03-17
申请号：US575982
申请日：1990-08-31
CPC分类号： C08J9/142 , C08G73/1032 , C08J9/125 , C08J2379/08
摘要： Polyimide foam of desired density is produced by adding to a polyimide precursor comprising carboxylic and diamine components at least one foam-enhancing polar, protic additive of the formula ROH, where R is hydrogen, or C.sub.1 to C.sub.12 linear or branched alkyl or cycloalkyl, unsubstituted or substituted with halo, aryl, alkoxy or hydroxy, and heating the resultant slurry to a temperature that does not exceed about 105.degree. C. to form a homogeneous melt. When heated to a higher temperature the melt foams and cures. The density of the foam is affected by the amount of foam-enhancing additive which is utilized.
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公开(公告)号：US5077318A
公开(公告)日：1991-12-31
申请号：US719920
申请日：1991-06-24
CPC分类号： C08J9/142 , C08G73/1032 , C08J9/125 , C08J2379/08
摘要： Polyimide foam of desired density is produced by adding to a polyimide precursor comprising carboxylic and diamine components at least one foam-enhancing polar, protic additive of the formula ROH, where R is hydrogen, or C.sub.1 to C.sub.12 linear or branched alkyl or cycloalkyl, unsubstituted or substituted with halo, aryl, alkoxy or hydroxy, and heating the resultant slurry to a temperature that does not exceed about 105.degree. C. to form a homogeneous melt. When heated to a higher temperature the melt foams and cures. The density of the foam is affected by the amount of foam-enhancing additive which is utilized.
摘要翻译： 通过向包含羧酸和二胺组分的聚酰亚胺前体中加入至少一种式ROH的促进泡沫的极性的质子性添加剂，其中R为氢或C1至C12的直链或支链烷基或环烷基，未取代的 或被卤素，芳基，烷氧基或羟基取代，并将所得浆液加热至不超过约105℃的温度以形成均匀的熔体。 当加热到更高的温度时，熔体发泡并固化。 泡沫的密度受所使用的增泡添加剂的量的影响。
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