-
公开(公告)号：US06333394B1
公开(公告)日：2001-12-25
申请号：US09379234
申请日：1999-08-23
申请人： Christian Maria Emile Bailly , Bhaskar Bhairavnath Idage , Swaminathan Sivaram , Nayaku Nivarati Chavan , Rein Mollerus Faber , Shamal Karunakaran Menon , Gautam Chatterjee , Godavarthi Satyana Varadarajan , James Day , Patrick Joseph McCloskey , Joseph Anthony King, Jr. , Arun Savalaram Jadhav
发明人： Christian Maria Emile Bailly , Bhaskar Bhairavnath Idage , Swaminathan Sivaram , Nayaku Nivarati Chavan , Rein Mollerus Faber , Shamal Karunakaran Menon , Gautam Chatterjee , Godavarthi Satyana Varadarajan , James Day , Patrick Joseph McCloskey , Joseph Anthony King, Jr. , Arun Savalaram Jadhav
IPC分类号： C08G6400
CPC分类号： C08G64/20 , C08G64/06 , C08G64/14 , C08G64/183 , C08G64/307
摘要： Copolycarbonates containing such structural units as birefringence-reducing or “soft block” units are prepared by conducting a reaction, such as melt polymerization or equilibration, between a precursor polycarbonate and a monomer, polycarbonate oligomer or high molecular weight polycarbonate which is a source of other structural units. The crystallinity of the resulting precursor copolycarbonate or one of the reagents employed in its preparation is enhanced and the precursor copolycarbonate is subjected to solid state polymerization.
摘要翻译： 通过在前体聚碳酸酯和单体，聚碳酸酯低聚物或高分子量聚碳酸酯之间进行诸如熔融聚合或平衡的反应来制备含有诸如双折射降低或“软嵌段”单元的结构单元的共聚碳酸酯 结构单位。 得到的前体共聚碳酸酯或其制备中使用的试剂之一的结晶度提高，前体共聚碳酸酯进行固态聚合。
-
公开(公告)号：US06248858B1
公开(公告)日：2001-06-19
申请号：US09192350
申请日：1998-11-16
IPC分类号： C08G6400
摘要： Polymerization of polycarbonates is performed by first enhancing the crystallinity of a precursor polycarbonate, such as an oligomer, by contact in pellet form with an alkanol in the liquid or vapor state as non-solvent, and then conducting solid state polymerization in a stream of inert gas such as nitrogen. The solid state polymerization operation includes a stage of heating at a constant temperature in the range of about 215-225° C., optionally combined with a first heating stage at a constant temperature in the range of about 180-190° C. The method is adaptable to continuous operation and produces a polycarbonate having a number average molecular weight, as determined by gel permeation chromatography relative to polystyrene, of at least 15,000.
摘要翻译： 聚碳酸酯的聚合通过首先通过以颗粒形式与液体或蒸气状态的链烷醇作为非溶剂接触来提高前体聚碳酸酯如低聚物的结晶度，然后在惰性气流中进行固态聚合 气体如氮气。 固态聚合操作包括在约215-225℃的恒定温度下加热的阶段，任选地在约180-190℃的恒定温度下与第一加热阶段组合。方法 适用于连续操作，并且通过凝胶渗透色谱法相对于聚苯乙烯产生数均分子量为至少15,000的聚碳酸酯。
-
公开(公告)号：US06187895B1
公开(公告)日：2001-02-13
申请号：US09370435
申请日：1999-08-09
IPC分类号： C08G6400
摘要： Solid state polymerization of polycarbonates and polyesters is preceded by a step of contacting particles of an amorphous precursor polymer with a particulate material, typically a crystallized polycarbonate, which prevents adherence of the precursor polymer particles to each other. It is then possible to perform the solid state polymerization step without crystallizing the precursor polymer.
摘要翻译： 聚碳酸酯和聚酯的固态聚合之前是将无定形前体聚合物的颗粒与颗粒材料（通常为结晶的聚碳酸酯）接触的步骤，其阻止前体聚合物颗粒相互粘附。 然后可以进行固态聚合步骤而不使前体聚合物结晶。
-
-
搜索结果
3 条记录 (耗时 0.02 秒)