公开(公告)号：US20200017769A1

公开(公告)日：2020-01-16

申请号：US16577105

申请日：2019-09-20

申请人： Kuraray Co., Ltd.

发明人： Takafumi KONNO ,  Tatsuya SUNAMOTO ,  Michiyuki NANBA ,  Tetsuya HARA

IPC分类号： C09K19/38 ,  C09K19/32 ,  H05K1/05 ,  C08G63/60

摘要： Provided are a thermoplastic polymer capable of reducing a dielectric dissipation factor in high frequency bands and a film thereof. The thermoplastic liquid crystal polymer includes repeating units represented by the following formulae (I), (II), (III) and (IV), in which a molar ratio of a total amount of the repeating units represented by formulae (I) and (II) to a total amount of all the repeating units in the thermoplastic liquid crystal polymer is 50 to 90 mol %, and a molar ratio of the repeating unit represented by formula (III) to the repeating unit represented by formula (IV) is the former/the latter=23/77 to 77/23.

公开(公告)号：US20170173850A1

公开(公告)日：2017-06-22

申请号：US15300527

申请日：2015-03-26

申请人： KURARAY CO., LTD.

发明人： Toshiyuki ZENTO ,  Naoto FUKUHARA ,  Eiji NAKAMURA ,  Michiyuki NANBA

IPC分类号： B29C55/16 ,  B29C55/00 ,  B32B27/30 ,  B44C3/02 ,  B32B27/08 ,  C08J5/18 ,  G02B1/14 ,  B29C55/02 ,  B32B27/36

CPC分类号： B29C55/16 ,  B29C55/005 ,  B29C55/023 ,  B29C55/12 ,  B29C55/165 ,  B29K2033/08 ,  B29K2069/00 ,  B29K2425/00 ,  B32B27/08 ,  B32B27/30 ,  B32B27/365 ,  B32B2250/24 ,  B44C3/02 ,  C08J5/18 ,  C08J2333/12 ,  C08J2469/00 ,  G02B1/14 ,  G02B5/3033

摘要： The present invention provides a method of manufacturing a biaxially stretched film which exhibits small heat shrinkage and has excellent dimensional stability. An unstretched thermoplastic resin film composed of at least one thermoplastic resin layer is biaxially stretched in a longitudinal direction and a width direction to manufacture the biaxially stretched film. The method of manufacturing the biaxially stretched film according to the present invention includes: a process (I) for preheating the thermoplastic resin film to a temperature in a rubbery plateau region in a storage elastic modulus curve; a process (II) for biaxially stretching the thermoplastic resin film under a condition that a stretching speed is 500%/min or higher while heating the thermoplastic resin film to the temperature in the rubbery plateau region; a process (III) for cooling the thermoplastic resin film after the process (II) to a temperature in a glass-to-rubber transition region or a glass region in the storage elastic modulus curve; and a process (IV) for relaxing the thermoplastic resin film after the process (III) under the temperature in the glass-to-rubber transition region.