公开(公告)号：DE2842185A1

公开(公告)日：1980-04-10

申请号：DE2842185

申请日：1978-09-28

Applicant: BASF AG

Inventor： APPOLDT HANS ING GRAD ,  WAGNER WERNER DIPL ING DR ,  HAUCK KARL ,  BAUR REINHOLD DIPL PHYS DR

IPC: B31B41/00 ,  B31B70/00 ,  B31B160/10 ,  B31B39/00

Abstract: A process for the manufacture of a jacket, comprising two cover sheets joined to one another, for a flexible disk for data recording, the cover sheets and the nonwoven lining being punched out in the form of blanks including the functional apertures, and the cover sheet blank and the nonwoven blank being joined to one another and then folded to form the jacket, wherein the sheet material for the cover sheets is transferred from a magazine, with the aid of mechanical, air-operated grippers provided with positioning means, to an assembly surface and is there provided, the sheet of nonwoven material from a second magazine is tacked onto the cover sheet material by spot-welding and is then joined thereto over the entire surface by thermal welding, thereafter the cover sheet material thus provided with the nonwoven covering is transferred to a holder frame and then conveyed, with this frame, to a punching device where it is punched out to form a blank provided with the functional apertures, subsequently the blank is removed from the holder frame by means of mechanical, air-operated grippers and is placed in the correct position on a carrier and folded to form the jacket, and at the same time the folds are stabilized by heating and subsequently cooling the material in the region of the folds, and the surface which come into contact on folding are welded to one another in the marginal portions of the jacket.

公开(公告)号：DE2744309A1

公开(公告)日：1979-04-12

申请号：DE2744309

申请日：1977-10-01

Applicant: BASF AG

Inventor： BAUR REINHOLD DIPL PHYS DR ,  HARTMANN HANS-JOERG DR ,  KLEIN URSULA ,  MOTZ HERBERT DR

IPC: C09D5/23 ,  G11B5/70 ,  G11B5/68

Abstract: Prodn. of a magnetic-recording material involves dispersing finely-divided magnetically anisotropic material and usual additives in a soln. of a polymeric binder in an organic solvent, applying it to an unmagnetisable substrate, aligning the magnetic material with a magnetic field and drying and/or hardening. Improvement is that a 2-imidazoline cpd. of formula (I) (where R is 2-20C linear or branched (un)satd. hydrocarbyl; Y is OH or amino) is added as dispersant. The packing density of the particles and hence the remanent magnetisation are increased.

公开(公告)号：DE2741341A1

公开(公告)日：1979-03-22

申请号：DE2741341

申请日：1977-09-14

Applicant: BASF AG

Inventor： MOTZ HERBERT DIPL CHEM DR ,  SCHNEIDER NORBERT ,  HARTMANN HANS-JOERG DR ,  BAUR REINHOLD DIPL PHYS DR

IPC: G11B5/708 ,  C09D5/23 ,  G11B5/70