JPS57162135A - Information recording carrier - Google Patents

Information recording carrier

Info

Publication number
JPS57162135A
JPS57162135A JP56044831A JP4483181A JPS57162135A JP S57162135 A JPS57162135 A JP S57162135A JP 56044831 A JP56044831 A JP 56044831A JP 4483181 A JP4483181 A JP 4483181A JP S57162135 A JPS57162135 A JP S57162135A
Authority
JP
Japan
Prior art keywords
biscuit
copolymer
weight
average molecular
molecular weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56044831A
Other languages
Japanese (ja)
Inventor
Takeshi Moriwaki
Shinji Tokuhara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Daicel Corp
Original Assignee
Daicel Corp
Daicel Chemical Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Daicel Corp, Daicel Chemical Industries Ltd filed Critical Daicel Corp
Priority to JP56044831A priority Critical patent/JPS57162135A/en
Publication of JPS57162135A publication Critical patent/JPS57162135A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0057—Intermediate mediums, i.e. mediums provided with an information structure not specific to the method of reproducing or duplication such as matrixes for mechanical pressing of an information structure ; record carriers having a relief information structure provided with or included in layers not specific for a single reproducing method; apparatus or processes specially adapted for their manufacture

Landscapes

  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)

Abstract

PURPOSE:To suppress size variation and deformation and to reduce moisture permeability by compressing polystyrene or a copolymer which contains a >=10wt% styrene component. CONSTITUTION:A copolymer which contains methyl methacrylate and styrene in 60:40 proportion (by weight) and has 14X10<4> weight average molecular weight and 8X10<4> number average molecular weight is extruded by a 40mm.phi uniaxial extruding machine at 180 deg.C cylinder temperature and at a 80rpm screw rotational frequency to obtain a biscuit of molten resin. Then, this biscuit is sandwiched between stampers held at 170 deg.C and compressed for 20sec under 70kg/cm<2>; and it is cooled down to 70 deg.C in 30sec to form a disk having 1.25mm. thickness and a 30cm diameter.
JP56044831A 1981-03-27 1981-03-27 Information recording carrier Pending JPS57162135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56044831A JPS57162135A (en) 1981-03-27 1981-03-27 Information recording carrier

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56044831A JPS57162135A (en) 1981-03-27 1981-03-27 Information recording carrier

Publications (1)

Publication Number Publication Date
JPS57162135A true JPS57162135A (en) 1982-10-05

Family

ID=12702401

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56044831A Pending JPS57162135A (en) 1981-03-27 1981-03-27 Information recording carrier

Country Status (1)

Country Link
JP (1) JPS57162135A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940335A (en) * 1982-08-30 1984-03-06 Konishiroku Photo Ind Co Ltd Board for information recording medium
WO1986002653A1 (en) * 1984-11-02 1986-05-09 Sumitomo Chemical Company, Limited Optical resin materials
US5043405A (en) * 1988-01-07 1991-08-27 Asahi Kasei Kogyo Kabushiki Kaisha Methacrylic copolymer having low moisture absorption properties
US5198305A (en) * 1986-12-25 1993-03-30 Asahi Kasei Kogyo Kabushiki Kaisha Optical element substrate

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5940335A (en) * 1982-08-30 1984-03-06 Konishiroku Photo Ind Co Ltd Board for information recording medium
WO1986002653A1 (en) * 1984-11-02 1986-05-09 Sumitomo Chemical Company, Limited Optical resin materials
US5198305A (en) * 1986-12-25 1993-03-30 Asahi Kasei Kogyo Kabushiki Kaisha Optical element substrate
US5043405A (en) * 1988-01-07 1991-08-27 Asahi Kasei Kogyo Kabushiki Kaisha Methacrylic copolymer having low moisture absorption properties

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