公开(公告)号：JPH03152713A

公开(公告)日：1991-06-28

申请号：JP22851790

申请日：1990-08-31

Applicant: BASF AG

Inventor： MIHIYAERU BOBURITSUHI ,  HERUMAN RORAA ,  AUGUSUTO REENAA ,  UBUE KEPERAA ,  RUDORUFU ZUYUTEINGAA ,  BUERUNAA ROTSUHO ,  BUERUNAA RENTSU ,  GIYUNTAA SHIYURUTSU

IPC: C08G18/12 ,  C08G18/61 ,  C08G18/65 ,  C08G18/66 ,  C08G18/76 ,  C08L75/04 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

Abstract: PURPOSE: To improve a slippery characteristic and to lessen friction by using a nonmagnetic base body material and magnetic material powder in a binder contg. at least 50wt.% thermoplastic polyurethane as chief materials and using the specific plastic polyurethane. CONSTITUTION: This magnetic recording carrier consists of the nonmagnetic base body material and the magnetic material powder in the binder contg. at least 50wt.% thermoplastic polyurethane as the chief materials and has at least one layer of magnetic layers adhered and formed on a base body. In such a case, the thermoplastic polyurethane has 30 to 160 pieces and more particularly 40 to 80 pieces of OH groups and has a mol.wt. from 4000 to 30000 corresponding to a K value of 20 to 45 (measured as 1% soln. in DMF). As a result, the recording carrier having the improved wear resistance and decreased coefft. of friction is obtd.

公开(公告)号：JPH02292725A

公开(公告)日：1990-12-04

申请号：JP9418190

申请日：1990-04-11

Applicant: BASF AG

Inventor： HORUSUTO PURATSUTSU ,  PEETAA ENGERUHARUTO ,  FURIIDORITSUHI ZOMAAMAN ,  ARUBERUTO KOORU ,  YURUGEN KURAUSUMAN ,  RAINHORUTO BAURU ,  PEETAA HAIRUMAN ,  HERUMAN RORAA

IPC: G11B5/84 ,  G11B5/842

Abstract: PURPOSE: To improve the recording properties of a magnetic recording medium by producing a dispersion in a mixing and pulverizing machine filled with pulverizing balls having a specific diameter and density. CONSTITUTION: The dispersion is produced in the mixing and pulverizing machine filled with the pulverizing balls having a diameter of 0.2 to 3.0mm and a density of 3.6 to 3.9g/cm . The dispersion is post-treated in a ball mill including pulverizing balls having a diameter larger than 2.0mm and a density larger than 4.2g/cm . The dispersion is so produced that the viscosity of the resulted dispersion, measured at 25 deg.C is at least 50mPas and that the added particulate magnetic material has at least 14m /g as the surface layer measured by a BET method. Consequently, the stable dispersion is produced without increasing a dispersant ratio and/or stabilizer ratio by using the known effective dispersion assembly. As a result, the magnetic properties are intrinsically improved and the recording properties of the resulted magnetic recording medium are improved.

公开(公告)号：JPH02226517A

公开(公告)日：1990-09-10

申请号：JP32856389

申请日：1989-12-20

Applicant: BASF AG

Inventor： AUGUSUTO REENAA ,  RUDORUFU ZUYUTEINGAA ,  MIHIYAERU BOBURITSUHI ,  HERUMAN DEIKOBU ,  HERUMAN RORAA ,  BUERUNAA RENTSU ,  RUUTOBUIHI KURAITONAA ,  BUERUNAA ROTSUHO ,  NORUBERUTO SHIYUNAIDAA

IPC: C09D5/23 ,  C09D127/04 ,  C09D127/06 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/702 ,  G11B5/706

Abstract: PURPOSE: To stabilize long-time use without deteriorating magnetic characteristics by constituting a magnetic recording carrier of a polymer binder and ferromagnetic chromium dioxide finely dispersed into customarily used additives and additionally incorporating a multiple unsatd. org. compd. monomer specified in its content into the chromium dioxide. CONSTITUTION: The magnetic recording medium is mainly composed of a nonmagnetic carrier material, the polymer binder and the intrinsically ferromagnetic chromium dioxide finely dispersed into the customarily used additives and 0.1 to 8wt.% multiple unsatd. org. compd. monomer is additionally incorporated into the chromium dioxide. The monomer is a monomer having at least three double bonds per molecule, for which one kind of the compd. selected from a group consisting of linolenic acid or oil or oil-fatty acid mixture is used. More specifically, alcohol, acid, ester, diglyceride, 2,4-hexadienic acid, herring oil, sardine oil, etc., are used as the multiple unsatd. org. compd. to accelerate dispersion.

公开(公告)号：JPS6316420A

公开(公告)日：1988-01-23

申请号：JP17196486

申请日：1986-07-23

Applicant: BASF AG

Inventor： IEENE KOFUAKUSU ,  PEETAA ENGERUHARUTO ,  HERUMAN RORAA ,  ROOTARU SHIYUBUARUTSU ,  PEETAA NAAGERU

IPC: G11B5/714 ,  G11B5/84 ,  G11B5/842

公开(公告)号：JPS60205826A

公开(公告)日：1985-10-17

申请号：JP3898785

申请日：1985-03-01

Applicant: BASF AG

Inventor： BUERUNAA BARUTSU ,  IEENE KOFUAKUSU ,  BURUFU MIYUNTSUNAA ,  HERUMAN RORAA

IPC: C09D5/23 ,  C09D7/12 ,  G11B5/708

公开(公告)号：JPH03152115A

公开(公告)日：1991-06-28

申请号：JP22851590

申请日：1990-08-31

Applicant: BASF AG

Inventor： MIHIYAERU BOBURITSUHI ,  AUGUSUTO REENAA ,  ARUBERUTO KOORU ,  RUDORUFU ZUYUTEINGAA ,  UBUE KEPERAA ,  BUERUNAA RENTSU ,  HERUMAN RORAA ,  HERUMUUTO KOPUKE ,  GIYUNTAA HIYURUTSU

IPC: C08G18/12 ,  C08G18/38 ,  C08G18/50 ,  C08G18/65 ,  C08G18/66 ,  C08L75/04 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

公开(公告)号：JPH03152114A

公开(公告)日：1991-06-28

申请号：JP22851490

申请日：1990-08-31

Applicant: BASF AG

Inventor： UBUE KEPERAA ,  BUERUNAA RENTSU ,  GIYUNTAA SHIYURUTSU ,  ARUBERUTO KOORU ,  MIHIYAERU BOBURITSUHI ,  AUGUSUTO REENAA ,  HERUMAN RORAA ,  RUDORUFU ZUYUTEINGAA

IPC: C08G18/12 ,  C08G18/61 ,  C08G18/65 ,  C08G18/66 ,  C08G18/76 ,  C08L75/04 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

公开(公告)号：JPH01149219A

公开(公告)日：1989-06-12

申请号：JP27108888

申请日：1988-10-28

Applicant: BASF AG

Inventor： AUGUSUTO REENAA ,  ARUBERUTO KOORU ,  HERUMAN RORAA ,  BUERUNAA RENTSU ,  RUUTOBUIHI KURAITONAA ,  HERUMUUTO KOPUKE ,  FURIIDORITSUHI ZOMAAMAN ,  ERUNSUTO RITSUKAA

IPC: C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/70 ,  G11B5/702

Abstract: PURPOSE: To improve the weatherability of a magnetic film by incorporating specific hydrocarbon into a magnetizable layer at a specific ratio of a magnetizable material. CONSTITUTION: The magnetizable layer contains hydrocarbon of carbon atomicity of 16 to 40 having 3 to 10 pieces of satd. branch positions at a ratio of 0.1 to 2.0wt.% of the weight of the magnetizable material. The more preferable hydrocarbon is such that polyisobutene of carbon atomicity of 16 to 32 having 4 to 8 pieces of the satd. branch positions and more particularly, the polyisobutene of carbon atomicity of 22 to 28 having 5 to 7 pieces of the satd. branch positions occupy therein at least up to 60%. As a result, the weatherability is improved.

公开(公告)号：JPS60160025A

公开(公告)日：1985-08-21

申请号：JP27354984

申请日：1984-12-26

Applicant: BASF AG

Inventor： AUGUSUTO REENAA ,  ARUBERUTO KOORU ,  HERUMAN RORAA ,  BUERUNAA BARUTSU ,  EEBAAHARUTO KESUTAA ,  FURIIDORIHI ZOMAAMAN

IPC: C09D5/23 ,  C09D7/12 ,  C10M105/24 ,  C10M105/68 ,  C10N10/04 ,  C10N40/18 ,  G11B5/71

公开(公告)号：JPS6069833A

公开(公告)日：1985-04-20

申请号：JP14613184

申请日：1984-07-16

Applicant: BASF AG

Inventor： HERUMAN RORAA ,  AUGUSUTO REENAA ,  YOOAHIMU HATSUKU ,  BUERUNAA GURAU ,  BUERUNAA BARUTSU ,  RAINHORUTO BAURU

IPC: G11B5/842 ,  C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  G11B5/702 ,  G11B5/73 ,  G11B5/735 ,  G11B5/84