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    • 3. 发明授权
    • Extrusion method for making polycarbonate
    • 制造聚碳酸酯的挤出方法
    • US06506871B1
    • 2003-01-14
    • US10167903
    • 2002-06-12
    • Norberto SilviPatrick Joseph McCloskeyJames DayMark Howard Giammattei
    • Norberto SilviPatrick Joseph McCloskeyJames DayMark Howard Giammattei
    • C08G6400
    • C08G64/307
    • Extrusion of a mixture of an ester-substituted diaryl carbonate, such as bis(methyl salicyl) carbonate, a dihydroxy aromatic compound such as bisphenol A and a transesterification catalyst such as tetrabutylphosphonium acetate (TBPA) affords polycarbonate having a weight average molecular weight of greater than 20,000 daltons. The extruder is equipped with one or more vacuum vents to remove by-product ester-substituted phenol. Similarly, a precursor polycarbonate having ester-substituted phenoxy endgroups, for example methyl salicyl endgroups, when subjected to extrusion affords a polycarbonate having a significantly increased molecular weight relative to the precursor polycarbonate. The reaction to form a higher molecular weight polycarbonate may be catalyzed by residual transesterification catalyst present in the precursor polycarbonate, or by a combination of any residual catalyst and an additional catalyst such as TBPA introduced in the extrusion step. Fries rearrangement products are not observed in the product polycarbonates.
    • 碳酸二(甲基水杨基)酯,二羟基芳族化合物如双酚A和酯交换催化剂如四丁基鏻乙酸酯(TBPA)的酯取代的二芳基碳酸酯的混合物的挤出得到重均分子量更大的聚碳酸酯 超过20,000道尔顿。 挤出机配备有一个或多个真空通风口以除去副产物酯取代的苯酚。 类似地,具有酯取代的苯氧基端基的前体聚碳酸酯,例如甲基水杨基端基,当进行挤出时,得到相对于前体聚碳酸酯具有显着增加的分子量的聚碳酸酯。 形成较高分子量聚碳酸酯的反应可以通过存在于前体聚碳酸酯中的残留酯交换催化剂,或者通过任何残余催化剂和另外的催化剂如在挤出步骤中引入的TBPA的组合来催化。 在产品聚碳酸酯中没有观察到薯条重排产物。
    • 5. 发明授权
    • Method and system to compound silicone compositions
    • 组合硅酮组合物的方法和系统
    • US06511217B1
    • 2003-01-28
    • US09705266
    • 2000-11-03
    • Norberto SilviMark Howard Giammattei
    • Norberto SilviMark Howard Giammattei
    • B01F702
    • B29B7/7466B29B7/007B29B7/426B29B7/90B29C47/0009B29C47/50B29K2083/00
    • A method and system are provided that efficiently compound high levels of inorganic filler, processing fluid and silicone polymer at a commercial rate into homogeneous filled and devolatilized silicone compositions. In the method, filled silicone compositions are compounded by compounding a filler, processing fluid and silicone polymer in a first compounding apparatus to produce a first dispersed composition and simultaneously compounding a filler, processing fluid and silicone polymer in a second compounding apparatus that shares a common extruder shaft with the first compounding apparatus to produce a second dispersed composition. The system comprises a first compounding apparatus and a sequential second compounding apparatus that shares a common shaft with the first compounding apparatus. An extruder transition section of the system includes an enclosed discharge chamber defined by a first sectioning wall, a second sectioning wall and a contoured lower wall that transitions toward a discharge port and a shaft extends through the first sectioning wall, traverses the chamber and extends through the second sectioning wall.
    • 提供了一种方法和系统,其以商业速率有效地将高含量的无机填料,加工流体和硅氧烷聚合物复合到均匀的填充和脱挥发份的硅氧烷组合物中。 在该方法中,填充的硅氧烷组合物通过在第一配混装置中混合填料,加工流体和硅氧烷聚合物来混合,以制备第一分散组合物,并且在共享共同的第二配混装置中同时混合填料,加工液和硅氧烷聚合物 挤出机轴与第一配混设备产生第二分散组合物。 该系统包括与第一混合装置共用公共轴的第一混合装置和顺序第二混合装置。 系统的挤出机过渡部分包括由第一分段壁,第二分段壁和轮廓下壁限定的封闭排放室,该下壁朝向排放口转变,并且轴延伸穿过第一分段壁,穿过室并延伸穿过 第二分段墙。