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33 条记录 (耗时 0.026 秒)

    Crosslinkable polyimides from bis (aminophenoxy) benzonitriles
    7.
    发明授权
    Crosslinkable polyimides from bis (aminophenoxy) benzonitriles 失效
    来自BIS（氨基苯氧基）苯并噻唑的交联聚氨酯

    公开(公告)号：US5101005A

    公开(公告)日：1992-03-31

    申请号：US348633

    申请日：1989-05-18

    申请人： Rohitkumar H. Vora ,  Dinesh N. Khanna ,  Wolfgang K. Appel

    发明人： Rohitkumar H. Vora ,  Dinesh N. Khanna ,  Wolfgang K. Appel

    IPC分类号： C08G73/10

    CPC分类号： C08G73/105

    摘要： The present invention provides cross-linkable polyimide polymers having at least one repeating unit of the sturcture of: ##STR1## wherein n is the number of repeating groups and A is a tetravalent aromatic organic radical wherein each pair of carbonyl groups are attached to adjacent carbons in the ring moiety A.It has been found that polyimides having the structure of formula I may be crosslinked at surprisingly low temperatures when heated from about 75 to about 110.degree. C. to form infusible and solvent resistant shapes, thereby rendering them useful in the preparation of films, laminates and composites where inertness to solvents is a prerequisite.

    Process for insolublizing solvent soluble polyimide compositions
    8.
    发明授权
    Process for insolublizing solvent soluble polyimide compositions 失效
    不溶解溶剂可溶性聚酰亚胺组合物的方法

    公开(公告)号：US4877653A

    公开(公告)日：1989-10-31

    申请号：US217796

    申请日：1988-07-12

    申请人： Rohitkumar H. Vora ,  Dinesh N. Khanna ,  Suzanne Fontaine

    发明人： Rohitkumar H. Vora ,  Dinesh N. Khanna ,  Suzanne Fontaine

    IPC分类号： B05D3/02

    CPC分类号： C08J7/08 ,  C08J2379/08 ,  Y10T428/31721

    摘要： A method of insolubilizing solvent soluble polyimides comprising the imidized condensation products of an aromatic dianhydride and a primary aromatic diamine wherein at least one of said dianhydride or diamine is selected from the group consisting of 2,2-hexafluoro-bis(3,4-dicarboxyphenyl)propane dianhydride; 2,2-hexafluoro-bis(3-aminophenyl) propane; 2,2-hexafluoro-bis(4-aminophenyl)propane; 2,2-hexafluoro-bis-[4-(3-aminophenoxy)phenyl]propane; 2,2-hexafluoro-bis[4-(4-aminophenoxy)phenyl]propane; 1,1-bis(4-aminophenyl)-1-phenyl-2,2,2-trifluoroethane; 1,1-bis-[4-(1,2-dicarboxyphenyl)]-1-phenyl-2,2,2-trifluoroethane dianhydride and mixtures thereof.The method comprises forming a shaped article or film comprising the polyimides and subjecting same to a heat annealing process at a temperature of at least 325.degree. C. and for a period of time sufficient to insolubilize the polyimide. Preferred temperatures range from 350.degree. C. to 400.degree. C. for a period of time of at least 45 minutes to about 2 hours.

    摘要翻译： 一种不溶解溶剂可溶性聚酰亚胺的方法，其包括芳族二酐和伯芳族二胺的酰亚胺化缩合产物，其中所述二酐或二胺中的至少一种选自2,2-六氟双（3,4-二羧基苯基 ）丙烷二酐; 2,2-三氟 - 双（3​​-氨基苯基）丙烷; 2,2-四氟 - 双（4-氨基苯基）丙烷; 2,2-二氟 - 双 - [4-（3-氨基苯氧基）苯基]丙烷; 2,2-六氟双[4-（4-氨基苯氧基）苯基]丙烷; 1,1-双（4-氨基苯基）-1-苯基-2,2,2-三氟乙烷; 1,1-双 - [4-（1,2-二羧基苯基）] -1-苯基-2,2,2-三氟乙烷二酐及其混合物。 该方法包括形成包含聚酰亚胺的成形制品或薄膜，并在至少325℃的温度下进行热退火处理，并使其持续足以使聚酰亚胺不溶化的时间。 优选的温度为350℃至400℃，时间为至少45分钟至约2小时。

    Polymers prepared from 4,4'-bis(3,4-dicarboxyphenyl) hexafluoroisopropyl) diphenyl dianhydride
    9.
    发明授权
    Polymers prepared from 4,4'-bis(3,4-dicarboxyphenyl) hexafluoroisopropyl) diphenyl dianhydride 失效
    由4,4'-双（3,4-二羧基苯基）六氟异丙基）二苯基二酐制备的聚合物

    公开(公告)号：US5061784A

    公开(公告)日：1991-10-29

    申请号：US543232

    申请日：1990-08-06

    申请人： Werner H. Mueller ,  Rohitkumar H. Vora

    发明人： Werner H. Mueller ,  Rohitkumar H. Vora

    IPC分类号： C08G73/10

    CPC分类号： C08G73/1039

    摘要： Polyimides and polyamide-acids having improved solubility and processing characteristics and high glass transition temperatures are provided, having incorporated into the polymeric chain the novel aromatic dianhydride compound 4,4'-bis[2-(3,4-dicarboxyphenyl) hexafluoroisopropyl] diphenyl dianhydride. The polyamide-acids and polyimides are prepared by reacting the 12F-Diphenyl DA with aromatic or aliphatic diamines. It has been found that the polyimides of this invention have improved solubility characteristics, good dielectric properties while at the same time exhibiting relatively high glass transition temperatures, and superior thermal and thermo-oxidative stability. The polymers may be processed into films, fibers or compression molded or fabricated into composites at moderate temperatures and pressures.

    摘要翻译： 提供了具有改进的溶解性和加工特性以及高玻璃化转变温度的聚酰亚胺和聚酰胺酸，其已经引入到聚合物链中，新的芳族二酐化合物4,4'-双[2-（3,4-二羧基苯基）六氟异丙基]二苯基二酐 。 聚酰胺酸和聚酰亚胺通过12F-二苯基DA与芳族或脂族二胺反应来制备。 已经发现，本发明的聚酰亚胺具有改善的溶解性，良好的介电性能，同时具有较高的玻璃化转变温度，以及优异的热和热氧化稳定性。 聚合物可以加工成薄膜，纤维或在中等温度和压力下压塑或制成复合材料。

    Polymers prepared from 2-(3-aminophenyl)-2-(4-aminophenyl) hexafluoro propane
    10.
    发明授权
    Polymers prepared from 2-(3-aminophenyl)-2-(4-aminophenyl) hexafluoro propane 失效
    由2-（3-氨基苯基）-2-（4-氨基苯基）六氟丙烷制备的聚合物

    公开(公告)号：US4978742A

    公开(公告)日：1990-12-18

    申请号：US252428

    申请日：1988-09-30

    申请人： Rohitkumar H. Vora ,  Werner H. Mueller

    发明人： Rohitkumar H. Vora ,  Werner H. Mueller

    IPC分类号： B29C43/00 ,  B29K79/00 ,  C08G73/10 ,  C08J5/18 ,  D01F6/74

    CPC分类号： C08G73/1039

    摘要： Polyimides and polyamide-acids having improved solubility and processing characterisitcs are provided having incorporated into the polymeric chain as a novel aromatic diamine compound, 2-(3-aminophenyl)-2-(4-aminophenyl) hexafluoropropane (3,4'-6F Diamine). The polyamide-acids and polyimides are prepared by reacting the 3,4'-6F Diamine with aromatic tetracarboxylic acids or anhydrides thereof. It has been found that the polyimides of this invention have improved solubility characterisitics, low dielectric constants and improved thermal flow properties as a consequence of the meta/para positioning of the amino groups on the diamine, which renders these polymers more readily melt spinnable for the production of fibers. The polymers may also be compression molded and fabricated into composites at moderate temperatures and pressures. Solutions of the polyimides may be cast into films.