公开(公告)号：DE19644347A1

公开(公告)日：1997-05-07

申请号：DE19644347

申请日：1996-10-25

Applicant: BASF MAGNETICS GMBH

Inventor： WUENSCH THOMAS DR ,  KRESS RIA DR ,  LOCH WERNER DR ,  LEHNER AUGUST ,  KOHL ALBERT ,  SCHNEIDER NORBERT ,  BURKHARDT UWE

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 ,  C08G18/30 ,  C09D17/00

Abstract: A hydroxyl-containing polyurethane (I) comprises (a) a 6-30C diisocyanate; (b) a component comprising (i) a 2-20C aliphatic diol or (ii) a 8-30C aromatic-(cyclo)aliphatic diol having non-phenolic hydroxyl groups as the diol hydroxyl groups; and (c) a 3-18C polyhydric alcohol having at least 3 hydroxyl groups and non-phenolic hydroxyl groups as alcohol hydroxy groups. The total number of non-phenolic hydroxyl groups in (I) is 1.1-5.0 per isocyanate group in (a). Also claimed are (1) a binder system curable by crosslinking, which comprises (I) and (d) a polyfunctional isocyanate, and where the ratio of isocyanate groups in (d) to the number of free hydroxyl groups in (I) is 0.3-5.0; and (2) a coated article (preferably a magnetic recording material) obtained by applying a layer of the binder system and subsequently crosslinking. Preferably (b) is a 2-10C aliphatic diol. (c) is a 3-6C polyhydric alcohol having 3-5 hydroxyl groups. The binder system contains non-magnetic or magnetic pigments.

公开(公告)号：DE4433931A1

公开(公告)日：1995-04-06

申请号：DE4433931

申请日：1994-09-23

Applicant: BASF MAGNETICS GMBH

Inventor： BRODT GREGOR DR ,  VASS ATTILA DR ,  LOCH WERNER DR ,  LEHNER AUGUST ,  LENZ WERNER DR ,  SCHNEIDER NORBERT

IPC: C08G18/10 ,  C08G18/62 ,  C08G18/78 ,  C09D5/23 ,  C09D175/00 ,  C09D175/04 ,  G11B5/702 ,  C08G18/83

Abstract: The invention concerns magnetic recording media consisting of a nonmagnetic base material and, firmly adherent thereto, at least one magnetisable layer based on a magnetic material dispersed in a binder mixture which contains at least one hydroxyl-containing, preferably low molecular weight polyurea urethane and a polyurethane urea (meth)acrylate, characterised in that the polyurethane urea (meth)acrylate is obtained by reacting a poly(meth)acrylate having up to 2 OH end groups per mole and a molecular weight between 200 and 50000 with a mixture of aliphatic polyisocyanates having an average functionality of 3.0 to 6.0 NCO groups per mole and consisting of 0.1 to 10% by weight of a diisocyanate, 30 to 80% by weight of a triisocyanate, and 20 to 60% by weight of an isocyanate having a functionality of 4 to 10, with the proviso that 1.2 to 3.0 NCO groups are reacted per OH group and the remaining NCO groups are converted with polyfunctional amines or a mixture of various polyfunctional amines in substituted urea end groups.

公开(公告)号：DE4446383A1

公开(公告)日：1995-07-20

申请号：DE4446383

申请日：1994-12-23

Applicant: BASF MAGNETICS GMBH

Inventor： BRODT GREGOR DR ,  LEHNER AUGUST ,  LINDNER ALFRED DR ,  GRAF HERMANN DR ,  BOBRICH MICHAEL DR ,  KRESS RIA DR ,  SCHNEIDER NORBERT ,  KOHL ALBERT ,  LOCH WERNER DR

IPC: C08G18/65 ,  C08F2/38 ,  C08F8/30 ,  C08F8/32 ,  C08G18/10 ,  C08G18/62 ,  C08G18/78 ,  C09D5/23 ,  C09D7/45 ,  C09D17/00 ,  C09D175/04 ,  C09K23/00 ,  C09K23/52 ,  G11B5/70 ,  G11B5/702 ,  C08G18/30 ,  C08L75/00 ,  B01F17/52 ,  C09D175/00

Abstract: Novel polymer compsns. (I), for use as dispersant resins, are obtd. by reacting a hydroxylated polymer (II) with a polyfunctional isocyanate (III). The amt. of NCO gps. is 1.2-3.0 mol. per mol. of OH gps. of (II). Then the prod. (IV) is reacted with ammonia or a cpd. (V) having an isocyanate-reactive amino function. (II) is obtd. from 80-100 mol.% of a 1-25 C alkyl ester of an alpha , beta -unsatd. carboxylic acid, 0-20 mol.% of a comonomer, tetrahydrofuran hydroperoxide (THFHPO) as polymerisation initiator and opt. another polymerisation initiator and/or regulator, such that most of the chains of (II) are hydroxy-terminated. The process of prepn. of (I) is claimed, as well as (I) per se.