公开(公告)号：JPH09216928A

公开(公告)日：1997-08-19

申请号：JP29093196

申请日：1996-10-31

Applicant: BASF MAGNETICS GMBH

Inventor： TOOMASU BUYUNSHIYU ,  RIA KURESU ,  BUERUNAA ROTSUHO ,  AUGUSUTO REENAA ,  ARUBERUTO KOORU ,  NORUBERUTO SHIYUNAIDAA ,  UBUE BURUKUHARUTO

IPC: C08K3/08 ,  C08G18/10 ,  C08G18/32 ,  C08G18/38 ,  C08G18/64 ,  C08G18/72 ,  C08K3/22 ,  C08L75/00 ,  C08L75/04 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702

公开(公告)号：JPH0836735A

公开(公告)日：1996-02-06

申请号：JP356795

申请日：1995-01-12

Applicant: BASF MAGNETICS GMBH

Inventor： GUREEGORU BUROTO ,  TOOMASU BUYUNSHIYU ,  AUGUSUTO REENAA ,  ARUBERUTO KOORU

IPC: C08G18/12 ,  C08G18/65 ,  C09D5/23 ,  G11B5/702

Abstract: PURPOSE: To provide a bonding agent having an average molecular weight in a specified range, excellent mechanical property and a high crosslinking rate, by causing a reaction between specified polyurethane and a specified compound having an amino group reactive to an isocyanate group. CONSTITUTION: Polyurethane is made of 1mol of diol having an average molecular weight of 400-4000, 0.1-10mol of aliphatic/alicyclic diol, 0.01-10mol of aromatic diol, 0.01-2mol of trivalent alcohol, 0.01-8mol of polyvalent alcohol, and diisocyanate having a mol ratio with respect to all hydroxyl groups of 1.05:1 to 1.4:1. Aliphatic/alicyclic diol has 2-18 carbon atoms, and aromatic diol has 8-16 carbon atoms. By causing a reaction between this polyurethane and a compound having a hydroxyl group and an amino group reactive to an isocyanate group, a suitable composition for a crosslinkable coupling agent for forming a magnetic powder layer, containing a material having an average molecular weight of 25000-150000, may be provided.