会员体验
专利管家(专利管理)
工作空间(专利管理)
风险监控(情报监控)
数据分析(专利分析)
侵权分析(诉讼无效)
联系我们
交流群
官方交流:
QQ群: 891211   
微信请扫码    >>>
现在联系顾问~
热词
    • 3. 发明授权
    • Polyamides for extrusion applications
    • 用于挤出应用的聚酰胺
    • US4128599A
    • 1978-12-05
    • US753384
    • 1976-12-22
    • Norman W. ThomasFrank M. BerardinelliRobert Edelman
    • Norman W. ThomasFrank M. BerardinelliRobert Edelman
    • C08L77/00
    • C08L77/00
    • There is disclosed a process for preparing polycarbodiimide modified tractable polyamides having unique rheological properties which include increased melt strength and relative viscosity. These polycarbodiimide modified tractable polyamides are prepared by reacting the carboxyl end groups and to a lesser degree the amine end groups of tractable polyamides such as nylon 6,6, which are in a molten state with the polycarbodiimide groups of at least one polycarbodiimide such as poly(4,4'-diphenyl-methane carbodiimide) which both (a) is derived from at least one aromatic diisocyanate which is either unsubstituted or contains up to one methyl substituent on each aromatic ring, and (b) contains at least three carbodiimide units per polycarbodiimide molecule.The resulting polycarbodiimide modified tractable polyamide has improved melt strength and relative viscosity and a decreased number of carboxylic acid and amine end groups. These improved melt strength polyamides also have improved die swell and shear sensitivity characteristics and are generally useful in extrusion applications such as blow molding.
    • 公开了一种制备具有独特流变性能的聚碳化二亚胺改性易溶聚酰胺的方法,其包括增加的熔体强度和相对粘度。 这些聚碳化二亚胺改性的可处理聚酰胺是通过使羧基端基反应而得到的,较小程度上是可处理的聚酰胺如尼龙6,6的胺端基,它们与至少一种聚碳化二亚胺的聚碳二亚胺基例如聚 (a)衍生自至少一种芳族二异氰酸酯的(4,4'-二苯基 - 甲烷碳二亚胺),它们是未取代的或在每个芳族环上含有至多一个甲基取代基,和(b)含有至少三个碳二亚胺单元 每个聚碳二亚胺分子。
    • 7. 发明授权
    • Sized carbon fibers capable of use with polyimide matrix
    • 能够与聚酰亚胺基体一起使用的大尺寸碳纤维
    • US4394467A
    • 1983-07-19
    • US276108
    • 1981-06-22
    • Robert Edelman
    • Robert Edelman
    • D06M15/59C08J5/06D01F11/10D01F11/14D06M13/02D06M13/322D06M13/402D06M13/415D06M101/00D06M101/12D06M101/40B32B5/00B32B27/06D02G3/00
    • D01F11/14Y10T428/2918Y10T428/2933Y10T428/2938Y10T428/31721
    • Carbon fibers are provided which bear an improved finish coating upon the surface which is capable of withstanding the high temperatures (e.g., above 500.degree. F.) commonly encountered during the formation of composite structures employing a polyimide matrix. The sized carbon fibers prior to the curing to form a rigid polyimide coating are flexible, may be readily handled without significant damage, and are amenable to good impregnation with the matrix resin thereby facilitating the formation of quality composite structures. The finish comprises a mixture of selected precursors for the formation of a rigid polyimide (as described). More specifically, the size composition is formed from at least one aromatic diamine, at least one aromatic dianhydride, and at least one aromatic tetracarboxylic acid diester. A film-forming polyamic acid oligomer readily forms and is present as an intermediate reaction product within the finish coating and the aromatic tetracarboxylic acid diester has been found to beneficially serve primarily as a flexibility preserving diluent during the early stages of the polyimide-forming reaction which takes place within the finish coating. The finish is fully compatible with a polyimide matrix.
    • 提供了碳纤维,其在表面上具有改进的精加工涂层,其能够耐受在形成使用聚酰亚胺基质的复合结构期间常遇到的高温(例如高于500°F)。 在固化之前形成刚性聚酰亚胺涂层的尺寸的碳纤维是柔性的,可以容易地处理而没有显着的损坏,并且易于与基质树脂的良好浸渍,从而有助于形成质量复合结构。 整理剂包括用于形成刚性聚酰亚胺的所选前体的混合物(如所述)。 更具体地,尺寸组合物由至少一种芳族二胺,至少一种芳族二酐和至少一种芳族四羧酸二酯形成。 成膜聚酰胺酸低聚物容易形成并作为终涂层中的中间反应产物存在,并且已经发现芳族四羧酸二酯在聚酰亚胺形成反应的早期阶段主要用作柔性保护性稀释剂。 在涂层中进行。 完成与聚酰亚胺基体完全兼容。