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1. 发明专利

JPH063524A OPTICAL PHASE DIFFERENCE PLATE 失效
公开(公告)号：JPH063524A
公开(公告)日：1994-01-14
申请号：JP18876192
申请日：1992-06-23
申请人： KUREHA CHEMICAL IND CO LTD
发明人： SHOJI MASUHIRO , YAMAZAKI KENGO , KAKIZAKI SHOZO , NAKAMURA KENICHI
IPC分类号： C08L27/12 , G02B5/30
摘要： PURPOSE:To obtain the phase difference plate for which a high-polymer stretched film having small phase difference unevenness, high double refractive index and wavelength dispersibility to some extent and small coefft. of light elasticity by using a film formed by uniaxially orienting a crystalline copolymer of trifluoroethylene monochloride and vinylidene fluoride. CONSTITUTION:The substantially uniaxially oriented film consisting of the crystalline copolymer composed of 80 to 98wt.% trifluoroethylene monochloride and 2 to 20wt.% vinylidene fluoride is used. The phase difference unevenness is large and the phase difference plate which is practicably usable is not obtainable if the content of the trifluoroethylene monochloride exceeds 98wt.% or the content of the vinylidene fluoride is below 2wt.%. On the other hand, the crystallization degree is low and the rubberlike film is resulted if the content of the trifluoroethylene monochloride is below 80wt.%. A large change in the phase difference and dimensional change at a high temp. are resulted and such plate is not practicably usable when the film is made into the phase difference plate. More preferably, the film consists of 90 to 97wt.% trifluoroethylene monochloride and 3 to 10wt.% vinylidene fluoride.

2. 发明专利

JPH05249315A 失效
公开(公告)号：JPH05249315A
公开(公告)日：1993-09-28
申请号：JP8144892
申请日：1992-03-04
申请人： KUREHA CHEMICAL IND CO LTD
发明人： KAKIZAKI SHOZO , SHOJI MASUHIRO , NAKAMURA KENICHI
IPC分类号： B29C55/04 , B29K27/12 , B29L7/00 , B32B27/08 , C08J5/18 , G02B5/30
摘要： PURPOSE:To simultaneously satisfy the stability and flatness of the retardation of the optical phase difference film consisting of a vinylidene fluoride resin and a methyl methacrylate resin. CONSTITUTION:This optical phase difference film is an oriented film in which the vinylidene fluoride resin consists mainly of a beta type structure and has a heat absorption peak temp. at >=80 deg.C in DSC aside from the crystal m. p. and the mixing ratio of the vinylidene fluoride resin to the methyl methacrylate resin is 60/40 to 85/15. This film is obtd. by subjecting the oriented film in which the vinylidene fluoride resin consists mainly of the beta type structure and the mixing ratio of the vinylidene fluoride resin to the methyl methacrylate resin is 60/40 to 85/15, to a heat treatment at 90 to 160 deg.C, then laminating the film which has 1 to 6% shrinkage rate on heating and is the same as s the above-mentioned film or is different therefrom via a tacky adhesive agent onto the oriented film and subjecting the films in this state to a heat treatment at 70 to 155 deg.C.

3. 发明专利

JPH0314840A BIAXIALLY COLD-STRETCHED VINYLIDENE FLUORIDE POLYMER FILM AND ITS PREPARATION 失效
公开(公告)号：JPH0314840A
公开(公告)日：1991-01-23
申请号：JP33513189
申请日：1989-12-26
申请人： KUREHA CHEMICAL IND CO LTD
发明人： KAKIZAKI SHOZO , OTA MITSURU , TERASAKI SHUJI
IPC分类号： C08J5/18 , B29C55/12 , B29K27/00 , B29L7/00 , C08L27/12 , C08L27/14 , C08L27/16
摘要： PURPOSE:To prepare a biaxially cold-stretched vinylidene fluoride polymer film excellent in the mechanical strengths at a low cost by biaxially cold- stretching a specific vinylidene fluoride polymer by the inflation process. CONSTITUTION:A vinylidene fluoride polymer having an inherent viscosity of 0.8-1.6dl/g and a ratio of the wt.-average mol.wt. to the number-average mol.wt. of 10-20, or a polymer mixture comprising at least 30wt.% above- mentioned vinylidene fluoride polymer and 70wt.% or lower vinylidene fluoride polymer having a ratio of the wt.-average mol.wt. to the number-average mol.wt. of 10 or lower is biaxially cold-stretched pref. in a stretching ratio of at lest 1.5 in both the longitudinal and transverse directions by the inflation process.

4. 发明专利

JPS6046528B2 失效
公开(公告)号：JPS6046528B2
公开(公告)日：1985-10-16
申请号：JP15414080
申请日：1980-10-31
申请人： KUREHA CHEMICAL IND CO LTD
发明人： SASAKI TOORU , OOTA MITSURU , TERASAKI SHUJI , KAKIZAKI SHOZO
IPC分类号： H01G4/18 , H01G4/20 , H01G4/22

5. 发明专利

JPS62286720A MANUFACTURE OF CAPACITOR FILM COMPOSED OF VINYLIDENE FLUORIDE RESIN 失效
公开(公告)号：JPS62286720A
公开(公告)日：1987-12-12
申请号：JP12924886
申请日：1986-06-05
申请人： KUREHA CHEMICAL IND CO LTD
发明人： NAKAMURA KENICHI , KAKIZAKI SHOZO , SUZUKI KAZUMOTO , AKIMOTO MINORU
IPC分类号： B29C47/00 , B29C71/02 , B29K27/12 , B29L7/00 , H01G4/18
摘要： PURPOSE:To lower drastically tan delta while a dielectric constant of a film is maintained, by heat-treating a vinylidene fluoride resin film obtained through a specific process within a specific temperature range. CONSTITUTION:As vinylidene fluoride resin is used one wherein its inherent viscosity measured at 30 deg.C is 0.8-1.8dl/g in relation to a solution prepared at a density of 0.4g/d by making use of dimethylformamide as a solvent. Such a vinylidene fluoride resin is fused and extruded by a circular die without generating melt fracture at a temperature less than the decomposition temperature of the same. A blow-up ratio of an extruded tube is made into about 0.8 or more to such an extent as to obtain stable bubbles. The tube is cooled while the same is being inflated and drafted at about 0.8 of the blow-up ratio and at least 20 of the draft ratio in an extent for the extruded tube to have a stable bubble and a thickness of the film is made to be 0.5-0.3mum. The film obtained through cooling is heat-treated at 80-130 deg.C.

6. 发明专利

JPS617683B2 JPS617683B2 - 失效
公开(公告)号：JPS617683B2
公开(公告)日：1986-03-08
申请号：JP6631280
申请日：1980-05-19
申请人： Kureha Chemical Ind Co Ltd
发明人： SASAKI TOORU , OOTA MITSURU , TERASAKI SHUJI , KAKIZAKI SHOZO
IPC分类号： H01B3/44 , H01G4/18 , H01G4/22
CPC分类号： H01G4/18 , Y10T428/31522 , Y10T428/3154 , Y10T428/31544 , Y10T428/31681 , Y10T428/31699 , Y10T428/31935

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