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    BINDER FOR MAGNETIC RECODING MEDIUM
    21.
    发明专利
    BINDER FOR MAGNETIC RECODING MEDIUM 失效

    公开(公告)号：JPS62248127A

    公开(公告)日：1987-10-29

    申请号：JP9153786

    申请日：1986-04-21

    Applicant: KAO CORP

    Inventor： OKADA TOMOYUKI ,  KANNEN NAOKI ,  YAMASHITA KAZUTAKA ,  ISHIKAWA AKIRA ,  TSUSHIMA RIKIO

    IPC: G11B5/702 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  C09D175/06

    Abstract: PURPOSE:To obtain high durability in a wide environment in the temp. range of low to high temp. by using thermoplastic polyurethane resin whose mol. wt., tensile rupture strength, tensile rupture elongation, 100% modulus and glass transition temp. have been specified. CONSTITUTION:Thermoplastic polyurethane resin is used as a binder for a magnetic recording medium. the polyurethane resin has 5,000-40,000 number average mol. wt. analyzed by gel permeation chromatography, >=200kg/cm rupture strength, 100-400% rupture elongation and >=150kg/cm 100% modulus measured by a tension test at 100mm/min tension speed, and >=40 deg.C glass transition temp. determined by the measurement o the dynamic viscoelasticity. Thus, high durability can be provided in a wise environment in the temp. range of low to high temp.

    MAGNETIC RECORDING MEDIUM AND BINDER THEREFOR
    22.
    发明专利
    MAGNETIC RECORDING MEDIUM AND BINDER THEREFOR 失效

    公开(公告)号：JPS62165726A

    公开(公告)日：1987-07-22

    申请号：JP748286

    申请日：1986-01-17

    Applicant: KAO CORP

    Inventor： KANNEN NAOMI ,  TSUSHIMA RIKIO ,  YAMASHITA KAZUTAKA ,  OKADA TOMOYUKI

    IPC: G11B5/702 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04

    Abstract: PURPOSE:To improve the dispersibility of magnetic particles while maintaining the mechanical characteristics which a specific polyurethane resin resin possesses by using said polyurethane resin as a binder for a magnetic recording medium. CONSTITUTION:The polyurethane resin which is produced from the polyketone compd. having at least two hydroxyl groups and expressed by formula I or II as a polyol component is used as the binder for the magnetic recording medium. In formula, n is 1-43 number and m is 1-53 number. The polyketone compd. has preferably 400-6000 number average mol. wt. and more particularly preferably 500-4004000 number average mol. wt. in terms of the flexibility and strong toughness of the resultant polyurethane resin. The number average mol. wt. of the polyurethane resin is 1000-100000, more preferably 5000-50000. The magnetic recording medium is obtd. by providing a magnetic layer formed by dispersing pulverized ferromagnetic powder in such binder on a nonmagnetic base. The specific surface area of the pulverized ferromagnetic powder is preferably /g.

    MAGNETIC RECORDING MEDIUM
    26.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH01102726A

    公开(公告)日：1989-04-20

    申请号：JP25912887

    申请日：1987-10-14

    Applicant: KAO CORP

    Inventor： OKADA TOMOYUKI ,  KANNEN NAOKI

    IPC: G11B5/702 ,  C09D5/23 ,  C09D167/00

    Abstract: PURPOSE:To improve the electrical characteristics and dynamical properties of a magnetic layer by incorporating the crosslinked matter of polyester which has >=1 parts expressed by the specific constitutional formula in one molecular chain, has OH or the specific constitutional formula at both terminals of the main molecular chain and has >=500 and =1 parts expressed by formula I in one molecular chain, has OH or the specific constitutional formula expressed by formula II at both terminals of the main molecular chain and has >=500 and =1 integer [there is case when both (m) and (n) are simultaneously 0]. The magnetic recording medium having the high electrical characteristics and dynamical properties is thereby obtd.

    MAGNETIC RECORDING MEDIUM
    27.
    发明专利
    MAGNETIC RECORDING MEDIUM 失效

    公开(公告)号：JPH01102725A

    公开(公告)日：1989-04-20

    申请号：JP25912787

    申请日：1987-10-14

    Applicant: KAO CORP

    Inventor： OKADA TOMOYUKI ,  KANNEN NAOKI

    IPC: G11B5/702 ,  C09D5/23 ,  C09D175/14

    Abstract: PURPOSE:To improve the electrical characteristics and dynamical properties of a magnetic layer by incorporating the crosslinked matter of a compd. which is formed by converting both terminals of the molecular chain bonded with the two hydroxyl groups of a specific dihydroxyl compd. to (meth)acryloyl and has >=500 and =500 and

    PRODUCTION OF NOVEL UNSATURATED POLYESTER
    28.
    发明专利
    PRODUCTION OF NOVEL UNSATURATED POLYESTER 失效

    公开(公告)号：JPH01101325A

    公开(公告)日：1989-04-19

    申请号：JP25912487

    申请日：1987-10-14

    Applicant: KAO CORP

    Inventor： OKADA TOMOYUKI ,  KANNEN NAOKI

    IPC: C08G63/52

    Abstract: PURPOSE:To obtain the titled polymer, crosslinkable by exposure to radiation, forming strong films and useful also as a raw material for polyurethane resins, by subjecting lactones to ring opening polymerization using a specific dihydroxyl compound as an initiator. CONSTITUTION:Lactones are subjected to ring opening polymerization in the presence of a dihydroxyl compound expressed by formula I (R1, R2 and R4 are alkylene; R3 is hydrocarbon derived from diisocyanate group; R5 is H or CH3) as an initiator to afford the aimed polyester expressed by formula II (A is hydrocarbon derived from lactones; m and n are 0 or >=1, provided that m and n are not 0 at the same time). Furthermore, the compound expressed by formula I which is the initiator is a novel substance and produced from a diisocyanate compound and a hydroxylalkyl (meth)acrylate compound.

    PRODUCTION OF NOVEL POLYURETHANE RESIN
    29.
    发明专利
    PRODUCTION OF NOVEL POLYURETHANE RESIN 失效

    公开(公告)号：JPS6475512A

    公开(公告)日：1989-03-22

    申请号：JP23439287

    申请日：1987-09-18

    Applicant: KAO CORP

    Inventor： OKADA TOMOYUKI ,  KANNEN NAOKI

    IPC: C08G18/32 ,  C08G18/42 ,  C08G18/68

    Abstract: PURPOSE:To obtain the titled resin crosslinkable by irradiation to form tough coating film, by ring opening polymerization of a lactone using a specific dihydroxyl compound as the initiator followed by reaction of a polyisocyanate compound. CONSTITUTION:Using a dihydroxyl compound of formula I (R1, R2 and R4 are each alkylene; R3 is hydrocarbon of diisocyanate compound origin; R5 is H or CH3) (e.g. a compound of formula II) as the initiator, a lactone (e.g. epsilon- caprolactone) is brought to ring opening polymerization followed by reaction of a polyisocyanate compound (e.g. 4,4'-diphenylmethane diisocyanate) to obtain the objective resin with the both ends of the main molecular chain being OH groups or isocyanate groups. The compound of the formula I is a new material.

    PREPARATION OF NEW URETHANE OLIGOMER
    30.
    发明专利
    PREPARATION OF NEW URETHANE OLIGOMER 失效

    公开(公告)号：JPS6429411A

    公开(公告)日：1989-01-31

    申请号：JP18473187

    申请日：1987-07-24

    Applicant: KAO CORP

    Inventor： OKADA TOMOYUKI ,  KANNEN NAOKI

    IPC: C08G18/38 ,  C08G18/30 ,  C09D175/00

    Abstract: PURPOSE:To prepare the title oligomer which forms a cured film by irradiation and is useful as a material for polyurethane resin, by reacting a specified dihydroxyl compd. with a diisocyanate compd. and a polyol compd. CONSTITUTION:A dihydroxyl compd. of formula I (where R1, R2 and R4 are each alkylene; R3 is a hydrocarbon group; R5 is H, CH3) (e.g., compd. of formula II) is reacted with a diisocyanate compd. (e.g., isophorone diisocyanate) and a polyol compd. (e.g., polytetramethylene glycol) to give a urethane oligomer having hydroxyl groups on both ends of its main molecular chain. The dihydroxyl compd. of formula I is a new compd., which is obtd. by mixing a diisocyanate compd. with a hydroxyalkyl (meth)acrylate compd. under stirring, adding an inert org. solvent such as methyl ethyl ketone to said reaction system, further adding dialkanolamine thereto and stirring the mixture.

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