公开(公告)号：DE19531886A1

公开(公告)日：1997-03-06

申请号：DE19531886

申请日：1995-08-30

Applicant: BASF MAGNETICS GMBH

Inventor： STEPHAN OSKAR ,  WEINGART FRANZ DR ,  BURKHARDT UWE ,  THIELE HEINO DR ,  SCHWARZ LOTHAR ,  MUELLER NORBERT DR ,  EICHER JOCHEN DR

IPC: B29B17/02 ,  C08J11/08 ,  C08J11/04

Abstract: Large amounts of coated foils can be fed to a continuous recycling process in which the coating carrier material and any pigments present in the coating can be recovered. The treatment is carried out at room temperature in an alkaline medium comprising soft soap, organic solvents and/or water, optionally with the use of catalyst. The solvent is recirculated. After the first treatment step, the foil shreds can be treated in a second step with a solvent - water mixture, in a similar manner to the first step. A third step involves thorough final washing in a water or solvent circuit. The recovered foil shreds are dried, pressed, ground and shaped as desired in a plastics agglomerator and the recovered pigments are dried in a vacuum. The process and devices can advantageously be used for any type of coating carriers or printed carriers, for example magnetic coating carriers, printed plates or pigment-free coating carriers.

公开(公告)号：GB2306490A

公开(公告)日：1997-05-07

申请号：GB9622782

申请日：1996-11-01

Applicant: BASF MAGNETICS GMBH

Inventor： WUENSCH THOMAS ,  KRESS RIA ,  LOCH WERNER ,  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

Abstract: Hydroxyl-containing polyurethanes I are derived from a) a diisocyanate of 6 to 30 carbon atoms (component II) with b) a component III comprising * small Greek alpha *) an aliphatic diol of 2 to 20 carbon atoms or * small Greek beta *) an aromatic-aliphatic or aromatic-cycloaliphatic diol of 8 to 30 carbon atoms having nonphenolic hydroxyl groups as hydroxyl groups of the diol, and c) a polyhydric alcohol having at least 3 hydroxyl groups, 3 to 18 carbon atoms and nonphenolic hydroxyl groups as hydroxyl groups of the alcohol (component IV), the amounts of components II to IV being such that the total number of nonphenolic hydroxyl groups is from 1.1 to 5.0 per isocyanate group of II. The polyurethanes can be used as binders or binder components for pigment-containing coatings, in particular for the production of magnetic recording materials.

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.