中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

150 records (took 0.024 seconds)

    MEDIO REGISTRADOR MAGNETICO.
    2.
    发明专利
    MEDIO REGISTRADOR MAGNETICO. 未知

    公开(公告)号：ES2028705A6

    公开(公告)日：1992-07-01

    申请号：ES9100552

    申请日：1991-03-05

    Applicant: KAO CORP

    Inventor： NAKAYAMA HIDEHIKO ,  YAMASHITA KAZUTAKA

    IPC: C08G18/42 ,  C08G18/46 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  B32B27/40 ,  B32B33/00

    Abstract: MEDIO REGISTRADOR MAGNETICO. LA PRESENTE INVENCION SE REFIERE A UN MEDIO REGISTRADOR MAGNETICO QUE COMPRENDE UN SUSTRATO NO MAGNETICO Y UNA CAPA MAGNETICA, DISPUESTA SOBRE EL SUSTRATO, QUE COMPRENDE POLVO FERROMAGNETICO Y UN AGLUTINANTE QUE COMPRENDE UNA RESINA DE POLIURETANO, QUE SE OBTIENE POR REACCION DE POLIISOCIANATO CON POLIMETIL-VALERO-LACTONA-DIOL QUE SE PREPARA POLIMERIZANDO METIL-VALEROLACTONA EN PRESENCIA DE UN COMPUESTO DIHIDROXILICO QUE TIENE UN GRUPO SULFONATO METALICO COMO INICIADOR DE LA POLIMERIZACION. ESTE MEDIO REGISTRADOR MAGNETICO CONSTITUYE UNA MEJORA EN LO QUE SE REFIERE A DISPERSABILIDAD DEL POLVO MAGNETICO EN LA CAPA.

    3.
    发明专利
    未知

    公开(公告)号：DE2713535A1

    公开(公告)日：1977-10-27

    申请号：DE2713535

    申请日：1977-03-26

    Applicant: KAO CORP

    Inventor： TAKAMORI SHIGERU ,  YAMASHITA KAZUTAKA ,  KONO YOSHINAO

    IPC: C09D5/03 ,  C08G59/00 ,  C08G59/18 ,  C08L63/00 ,  C08L67/00 ,  C09D163/00 ,  C09D3/58

    Abstract: A thermosetting resin composition useful in a powder coating composition comprising a polyepoxy compound and a polycarboxylic acid obtained by reacting (1) one mole of a polycarboxylic acid obtained by reacting (i) one mole of a polyoxyalkylene ether of a dihydric phenol, with (ii) 1 to 4 moles of trimellitic acid or anhydride thereof, (2) from 0.1 to 0.5 moles of a diepoxy compound.

    Magnetic recording medium contg. new polyurethane binder - derived from poly:methyl:valerolactone diol with excellent dispersibility
    5.
    发明专利
    Magnetic recording medium contg. new polyurethane binder - derived from poly:methyl:valerolactone diol with excellent dispersibility 未知

    公开(公告)号：DE4110363A1

    公开(公告)日：1991-10-10

    申请号：DE4110363

    申请日：1991-03-28

    Applicant: KAO CORP

    Inventor： NAKAYAMA HIDEHIKO ,  YAMASHITA KAZUTAKA

    IPC: C08G18/42 ,  C08G18/46 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

    Abstract: Magnetic recording medium consists of a nonmagnetic substrate and a magnetic coating contg. a ferromagnetic powder (I) and a polyurethane resin (II) as binder. (II) is prepd. by reacting a polyisocyanate (III) with polymethylvalerolactone diol (IV), obtd. by polymerisation of beta-methyl-epsilon-valerolactone (sic; beta-methyl-delta-valerolactone) (V) in the presence of a di-OH cpd. (VI) contg. a metal sulphonate gp. as polymerisation initiator. USE/ADVANTAGE - (II) has excellent dispersibility. It gives a homogeneous (I) dispersion with low thixotropic property and the coatings have a smooth surface and excellent stability, even under tropical conditions. The material is useful e.g. for video tape. In an example, under N2, 1000 pts. of (A) (V), (B) epsilon-caprolactone (control) were dripped into a stirred mixt. of (A) 9.18, (B) 11.5 pts. Na di-2-hydroxyethyl-5-sulphoisophthalate and (A) 0.65, (B) 0 pt. Na in (A) 55.7, (B) 66.2 pts. ethylene glycol and the mixt. was kept 1 hr. at 40 deg.C, giving a polyester with Mn = 1000 and OH no. (A) 113, (B) 114, contg. (A) 260, (B) 30 micro-equiv./g of NaSO3 gps. 89.3 pts. 4,4'diphenylmethane diisocyanate were stirred into a homogeneous soln. of 100 pts. polyester in 323 pts. MEK at 80 deg.C and reacted 2-3 hr., giving an NCO-prepolymer. Then 11.9 pts. butan-1,4-diol and 13.9 pts. neopentyl glycol were added as chain extenders and reacted 10-15 h. at 70-85 deg.c with addn. of (A) 0.11, (B) 0.011 pt. dibutyl Sn dilaurate as urethanisation catalyst. Reaction was complete when the concn. of residual NCO gps. was max. 0.01%. The polyurethane contained (A) 120, (B) 9 micro-equiv./g of NaSO3 gps.

    MAGNETIC RECORDING MEDIUM
    6.
    发明专利
    MAGNETIC RECORDING MEDIUM 未知

    公开(公告)号：CA2036261A1

    公开(公告)日：1991-10-05

    申请号：CA2036261

    申请日：1991-02-13

    Applicant: KAO CORP

    Inventor： NAKAYAMA HIDEHIKO ,  YAMASHITA KAZUTAKA

    IPC: C08G18/42 ,  C08G18/46 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

    Abstract: A magnetic recording medium comprises a non-magnetic substrate and a magnetic layer, provided on the substrate, comprising ferromagnetic powder and a binder comprising polyurethane resin which is obtained by reacting polyisocyanate with polymethylvalerolactonediol prepared by polymerizing .beta.-methyl-.delta.-valerolactone in the presence of a dihydroxy compound having a metal sulfonate group as a polymerization initiator. It is is improved in view of dispersibility of magnetic power in the layer.

Patent Agency Ranking