Synthesis of telogens and optimization of tetrafluoroethene telomerization process
摘要:
The most advantageous technological parameters of tetrafluoroethene telomerization using 1-chloro-2-iodohexafluoropropane (telogen) towards the telomers n2-n4 or n1-n4 were experimentally established. The telomers n1-n4 were prepared with the yield of 48 mol% under the following conditions: temperature 170 degrees C, the molar ratio of 1-chloro-2-iodohexafluoropropane to tetrafluoroethene equal to 1.2, the autoclave filling of 1.5 kg dm(-3) The maximum yield of telomers n2-n4 amounted to 27 mol% when the molar ratio of telogen to tetrafluoroethene was decreased to 0.7 and the other parameters of synthesis remained the same. The optimum parameters for the synthesis of telogens: 1-chloro-2-iodohexafluoropropane and 2-iodoheptafluoropropane have been also determined. (c) 2006 Elsevier B.V. All rights reserved.
Window member for chemical mechanical polishing and polishing pad
申请人:JSR Corporation
公开号:EP1306163A1
公开(公告)日:2003-05-02
An object of the present invention is to provide a window member (12) for chemical mechanical polishing, which is excellent in antifouling property and transparency and is excellent in anti-scratching and, further, can easily perform detection of a polishing endpoint of the surface of a semiconductor wafer (4) by passing a light for endpoint detection, in polishing of a semiconductor wafer (4) using an optical endpoint detecting apparatus (6) and also to a polishing pad (1). A window member (12) for chemical mechanical polishing of the present invention is provided with a substrate part (12a) (comprised of polyurethane resin and the like), which is transparent partly at least, an antifouling resin layer (12b) formed on at least one side of the substrate part (12a). This antifouling resin layer (12b) is preferably comprised of a fluorine-based polymer having a polysiloxane segment in a main chain.
An object of the invention is to provide an electrode catalyst layer of a solid polymer electrolyte membrane-electrode assembly expressing excellent balance between water retention and drainage in an electrode, good power generation performance under any of low humidity and high humidity conditions, and also excellent durability of power generation.
The electrode catalyst layer of the invention contains catalyst particles, an ion exchange resin and a water repellent agent, wherein said water repellent agent contains at least one kind selected from the group consisting of (A) a fluorine-containing copolymer having a structure unit derived from a polyfluoroalkyl-containing (meth)acrylate and (B) a fluorine-containing copolymer having a specific structure unit derived from a fluorine-containing olefin monomer and a specific structure unit derived from a vinyl ether monomer.
Synthesis of perfluorinated allylic compounds by radical allylation and their purification over fluorous reverse-phase silica
作者:Ilhyong Ryu、Sergio Kreimerman、Tatsuro Niguma、Satoshi Minakata、Mitsuo Komatsu、Zhiyong Luo、Dennis P Curran
DOI:10.1016/s0040-4039(00)02153-5
日期:2001.1
A simple free-radical method for the preparation of a variety of perfluorinated allylic compounds has been developed starting from perfluoroalkyl iodides and allyltins. Allyltributyltin, methallyltributyltin and crotyltributyltin all proved to be useful For the transformation. The desired perfluorinated allylic compound was conveniently isolated from the crude mixture by solid-phase extraction with fluorous reverse-phase silica (FRPS). (C) 2001 Elsevier Science Ltd. All rights reserved.
Olefin polymer, process for manufacturing the same, curable resin composition, and antireflection coating
申请人:JSR Corporation
公开号:EP0953584B1
公开(公告)日:2002-12-18
FLUORINATED OLEFIN POLYMER, CURABLE RESIN COMPOSITION, AND ANTIREFLECTION FILM