公开(公告)号：US20070100118A1

公开(公告)日：2007-05-03

申请号：US11261262

申请日：2005-10-28

申请人： Gautam Chatterjee ,  Patrick McCloskey ,  Warren Reilly ,  William Richards ,  Subash Scindia ,  Gokul Srinivasan ,  Yatin Tayalia

发明人： Gautam Chatterjee ,  Patrick McCloskey ,  Warren Reilly ,  William Richards ,  Subash Scindia ,  Gokul Srinivasan ,  Yatin Tayalia

IPC分类号： C08G64/00

CPC分类号： C08G64/04 ,  C08G64/12 ,  C08G64/14 ,  C08G64/307 ,  C08G64/403

摘要： A method for producing a transparent article comprises the steps of melt transesterifying a monomer mixture in the presence of a transesterification catalyst to produce a hydroquinone polycarbonate copolymer product comprising greater than 45 mole percent of structural units derived from the hydroquinone. The monomer mixture comprises a hydroquinone, at least one aromatic dihydroxy compound other than the hydroquinone, and a carbonic acid diester. The hydroquinone polycarbonate copolymer product is then heated to a highest processing temperature of 5° C. to 20° C. above a maximum melting melt temperature for the hydroquinone copolymer product for a sufficient period of time to render the hydroquinone polycarbonate copolymer product transparent upon cooling to ambient temperature; and cooling the hydroquinone polycarbonate copolymer product to produce the transparent article. The method can also be used for producing transparent hydroquinone polycarbonate copolymers, which can be used for producing the transparent articles.

摘要翻译： 制备透明制品的方法包括在酯交换催化剂存在下熔融酯交换单体混合物以产生包含大于45摩尔％的衍生自对苯二酚的结构单元的氢醌聚碳酸酯共聚物产物的步骤。 单体混合物包含氢醌，至少一种除氢醌以外的芳族二羟基化合物和碳酸二酯。 然后将对苯二酚聚碳酸酯共聚物产物加热至高于氢醌共聚物产物的最大熔融熔融温度的5℃至20℃的最高加工温度足够的时间以使氢醌聚碳酸酯共聚物产品在冷却时透明 到环境温度; 并冷却氢醌聚碳酸酯共聚物产物以制备透明制品。 该方法也可用于生产可用于生产透明制品的透明氢醌聚碳酸酯共聚物。

公开(公告)号：US20050261460A1

公开(公告)日：2005-11-24

申请号：US11133827

申请日：2005-05-19

申请人： James Cella ,  Jan Kamps ,  Jan Lens ,  Kathryn Longley ,  Patrick McCloskey ,  Narayan Ramesh ,  Warren Reilly ,  Paul Smigelski ,  Marc Wisnudel

发明人： James Cella ,  Jan Kamps ,  Jan Lens ,  Kathryn Longley ,  Patrick McCloskey ,  Narayan Ramesh ,  Warren Reilly ,  Paul Smigelski ,  Marc Wisnudel

IPC分类号： C08G63/64 ,  C08G64/00 ,  C08G64/04 ,  C08G64/14 ,  C08G64/30 ,  C08L23/00 ,  C08L67/00 ,  C08L69/00

CPC分类号： C08G63/64 ,  C08G64/04 ,  C08G64/14 ,  C08G64/307 ,  C08L23/00 ,  C08L67/00 ,  C08L69/00 ,  C08L69/005 ,  C08L2666/18 ,  C08L2666/06

摘要： Polycarbonates containing low or undetectable levels of Fries rearrangement products and comprising repeat units derived from one or more of resorcinol, hydroquinone, methylhydroquinone, bisphenol A, and 4,4′-biphenol have been prepared by the melt reaction of one or more of the aforementioned dihydroxy aromatic compounds with an ester-substituted diaryl carbonate such as bis-methyl salicyl carbonate. Low, or in many instances undetectable, levels of Fries rearrangement products are found in the product polycarbonates obtained as the combined result of a highly effective catalyst system which suppresses the Fries reaction and the use of lower melt polymerization temperatures relative to temperatures required for the analogous polymerization reactions using diphenyl carbonate.