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    PREPARATION OF MODIFIED POLYESTER
    51.
    发明专利
    PREPARATION OF MODIFIED POLYESTER 失效

    公开(公告)号：JPS5460395A

    公开(公告)日：1979-05-15

    申请号：JP12604577

    申请日：1977-10-20

    Applicant: TORAY INDUSTRIES

    Inventor： YONETANI KIICHI ,  OKASAKA HIDESADA ,  MORIKAWA MASANOBU

    IPC: C08G18/00 ,  C08G18/42 ,  C08G18/48 ,  C08G63/00 ,  C08G63/91

    Abstract: PURPOSE:To prepare a modified polybutylene terephthalate suitable for injection molding, extrusion molding and blow molding, and having excellent elasticity, flexibility, melt flowability, etc.,by melt blending the polyester with specific diisocyanate. CONSTITUTION:(1) 100 Parts by weight of polybutyline terephthalate is melt mixed with (2) preferably 0.5-10 parts by weight of a polyether diisocyanate and/or a polyester diisocyanate having a molecular weight of 800-5,000 to give the desired modified polyester. The diisocyanates are prepared by reacting a polyether, e.g. polyethylene glycol having a molecular weight of 500-2,000, etc., or a polyester, e.g. poly-epsilon-caprolactone, etc., with a diisocyanate (e.g. hexamethylene diisocyanate, etc.).

    POLYETHYLENE-2,6-NAPHTHALATE FILM
    54.
    发明专利
    POLYETHYLENE-2,6-NAPHTHALATE FILM 失效

    公开(公告)号：JPH08157617A

    公开(公告)日：1996-06-18

    申请号：JP29958694

    申请日：1994-12-02

    Applicant: TORAY INDUSTRIES

    Inventor： OKASAKA HIDESADA ,  MORITA TORU ,  SASAKI TOSHIHIRO

    IPC: C08J5/18 ,  B32B27/36 ,  C08G63/88 ,  C08L91/00 ,  C08L91/06

    Abstract: PURPOSE: To prepare the subject film suitable as a substrate film for a magnetic recording medium requiring fine and uniform surface projections, not causing occurrence of defect of foreign matters resulting from surface precipitate and contamination with contact materials, containing an amount of a low-molecular weight substance precipitated on the surface equal to or smaller than a specific amount. CONSTITUTION: This film is a polyethylene-2,6-naphthalate film containing low-molecular weight substance precipitated on the surface when heated at 170 deg.C for three hours and contains wax having 20-250 deg.C melting point. This film, for example, is obtained by heat-treating polyethylene-2,6-naphthalate granules in a gas atmosphere of noncirculating nitrogen under normal pressure at 150-250 deg.C and making it into a film.

    PRODUCTION OF AROMATIC POLYESTER
    55.
    发明专利
    PRODUCTION OF AROMATIC POLYESTER 失效

    公开(公告)号：JPH05230199A

    公开(公告)日：1993-09-07

    申请号：JP9448192

    申请日：1992-04-14

    Applicant: TORAY INDUSTRIES

    Inventor： MORITA TORU ,  OKASAKA HIDESADA

    IPC: C08G63/78 ,  C08G63/16 ,  C08G63/91

    Abstract: PURPOSE:To efficiently produce the subject polyester having a high softening point and not containing a foreign material by depolymerizing an aromatic polyester in an alkylene glycol, subsequently separating insoluble particles using a specified centrifugation separator and then carrying out polycondensation again. CONSTITUTION:An aromatic polyester is depolymerized by using an alkylene glycol component in an amount of 0.1 to 5.0mol based on 1mol acid component constituting the aromatic polyester. The resultant aromatic dicarboxylic acid glycol ester and low-molecular polymers are melted at 120 to 250 deg.C and the molten material is charged into a centrifugation separator equipped with plural discs in the inside. Polyester-insoluble particles are separated by centrifugation in a condition of 1X10 to 2X10 G centrifugal force and polycondensation is then carried out in the presence of a polycondensation catalyst such as a glycol- soluble antimony compound. Thus, the objective polyester can be obtained.

    MAGNETIC RECORDING MEDIUM
    57.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH04276311A

    公开(公告)日：1992-10-01

    申请号：JP3639291

    申请日：1991-03-01

    Applicant: TORAY INDUSTRIES

    Inventor： ABE KOICHI ,  OKASAKA HIDESADA ,  OSHIMA KATSUNORI

    IPC: C09D5/23 ,  C09D7/12 ,  G11B5/73

    Abstract: PURPOSE:To compatibly obtain both of a high output characteristic and flawing property by specifying the average surface roughness on the magnetic layer side of metallic foil and the ratio between the average surface roughness of the surface not coated with the magnetic layer and the max. height to respectively specific ranges. CONSTITUTION:The magnetic recording medium is constituted by providing the magnetic layer on one surface of the metallic foil. The average surface roughness Ra on the magnetic layer side of this metallic foil is required to be 2 to 100nm and the ratio Rt/Ra between Ra of the surface not coated with the magnetic layer and the max. height Rt to be

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