公开(公告)号：EP0773244A4

公开(公告)日：1997-11-19

申请号：EP95925140

申请日：1995-07-17

申请人： DAIKIN IND LTD

发明人： OTANI KATSUHIDE ,  IHARA KIYOHIKO

IPC分类号： C08F6/00 ,  C08F14/18 ,  C08F214/18 ,  C08J3/12 ,  C08J5/00 ,  C08L27/12

CPC分类号： C08J3/12 ,  C08F6/00 ,  C08F214/18 ,  C08J2327/12 ,  Y10T428/1352 ,  Y10T428/139 ,  Y10T428/1397 ,  C08L27/12

摘要： A fine powder of a molten high-molecular-weight fluororesin having a melt viscosity of 108-1013 P, an apparent density of 0.4-1.5 g/cc, and a specific surface area of 2 m2/g or less. A molded article produced from this fluororesin, which has not been utilized heretofore, is reduced in the bleeding of particles, particularly suitable for use in a semiconductor making process, and capable of improvement in bending fatigue resistance, wear resistance, and so forth.

公开(公告)号：EP0723979A4

公开(公告)日：1996-10-23

申请号：EP94927084

申请日：1994-09-22

申请人： DAIKIN IND LTD

发明人： IHARA KIYOHIKO ,  NAKAI KAZUHIRO ,  MARUYA YOSHIKI

IPC分类号： C08F2/00 ,  C08F2/04 ,  C08F2/06 ,  C08F2/14 ,  C08F14/26 ,  C08F114/26

CPC分类号： C08F14/26 ,  C08F2/04

摘要： A process for producing a low-molecular-weight polytetrafluoroethylene (PTFE) having a melting point in the range of 250 to 325 °C, which comprises polymerizing tetrafluoroethylene in a solvent selected from the group consisting of hydrochlorofluorocarbons, hydrofluorocarbons and perfluorocarbons, each having a boiling point in the range of -10 to 70 °C, and additionally feeding the monomer to carry out the polymerization under a constant pressure. This process enables low-molecular-weight PTFE useful as additives for various uses to be produced in a solvent which has a low ozone depletion potential or does not deplete the ozone layer under an economically advantageous low pressure in a safely controllable range.